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                                                                                                                                                                                                      A-905TX

                                                                                                                                                                                              Ref. No. 3677

                                                                    SERVICE MANUAL
                                                                                                                                                                                                    052001



INTEGRATED STEREO AMPLIFIER

                                                              A-905TX

                                                                                                                                   STANDBY/ ON                          GRAPHIC EQ
                                                                                                                                              CLOCK         SLEEP     EFFECT   MODE



                                                                                                                                         PRESET                      TUNER INPUT
                                                                                                                                                              FM         AM

                                                                                                                                                                                    TAPE


                                                                                                                                                                     PAUSE / STEP    DVD


                                                                                                                                    REPEAT    SCROLL                                  MD


                                                                                                                                     PLAY MODE CLEAR          REC



                                                                                                                                    REPEAT    RANDOM                                  CD


                                                                                                                                    MEMORY    CLEAR
                                                                                                                                                             DISC

                                                                                                                                    REPEAT PLAY MODE                                 CDR


                                                                                                                                     TONE     CLEAR           REC


                    INTEGRATED STEREO AMPLIFIER                                                                                                                                     MUTING
                                                                           VOLUME                      WIDE RANGE AMP TECHNOLOGY
                                                                                                                                     TIMER         1          2          3
                                                                                                          INPUT

                                                                                                                                                   4          5          6
                                                                                                                                    UP/DOWN
                                 CD       MD       TUNER       TAPE
  STANDBY/ON
                                                                                                                                                   7          8          9          VOLUME
                                                                                                                                                                     ACOUSTIC
                                                                                                                                                                     PRESENCE
                                                  LINE/ DVD   CDR/PC
                                                                                                                                     ENTER       --/- - -   10 / 0
      STANDBY
                                                                                       DIRECT

                                                                                                                                                            REMOTE CONTROLLER       RC-456S
                                                                                    SOURCE DIRECT
                              BASS             TREBLE           BALANCE                DIRECT                   ACOUSTIC
  POWER         PHONES                                                                          TONE            PRESENCE




 ON     OFF                                                                                                       OFF/1/ 2
                         --          +     --        +          L      R
                                                                                                                  A-905TX




                                         UDT                        120V AC, 60Hz
                                         UPT                        230-240V AC, 50Hz




 SAFETY-RELATED COMPONENT
 WARNING!!
  COMPONENTS IDENTIFIED BY MARK                                                                          ON THE
  SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE
  CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.
  REPLACE THESE COMPONENTS WITH ONKYO
  PARTS WHOSE PART NUMBERS APPEAR AS SHOWN
  IN THIS MANUAL.
  MAKE LEAKAGE-CURRENT OR RESISTANCE
  MEASUREMENTS TO DETERMINE THAT EXPOSED
  PARTS ARE ACCEPTABLY INSULATED FROM THE
  SUPPLY CIRCUIT BEFORE RETURNING THE
  APPLIANCE TO THE CUSTOMER.
                                                                                                                        A-905TX

SPECIFICATIONS
PART-XX




SERVICE PROCEDURES
PART-XX the fuses
 Replacing

                 This symbol located near the fuse indicates that the   REF.NO.    PART NO.       DESCRIPTION
 fuse used is show operating type, For continued protection against     F901      252158          1.6A-UL/T-237, Fuse 
 fire hazard, replace with same type fuse , For fuse rating, refer to             252069          0.8A-SE-EAK, Fuse 
 the marking adjest to the symbol.                                      F902-F904 252075          2.5A-SE-EAK, Fuse 

               Ce symbole indique que le fusible utilise est e lent.    NOTE:
 Pour une protection permanente, n'utiliser que des fusibles de meme    
 : Asian model only for 120V
 type. Ce demier est indique la qu le present symbol est apposre.        : Asian model only for 230V
                                                                                                                                                                          A-905TX

CHASSIS EXPLODED VIEW                                                                                                          A49                      A47
############                                                                                                                                                  A46
         P901                                                                                       U3
                                                                                    P402                          A49
                                                                                                                                                                            A49
                                                                              U2

                                 P584A                                                    P402

                   A40

                                                              U8

         A81                                       U7
                     A11                                                       A10
                    A11                                                U1                                               U5
                                                                                                     P701
  P801                                                                                                                           A49

                                                                                                   A10                                            A10
  A11                                                           Q527                                                                           A1
                                           A27
                                                 A34                        Q525                                                               A56
                                                         Q523
                                                                                                                                                 A13
                                 A25                    A27                                                                                                         A51
                           A41                                                                                                                      A54
                                                                                                                                                A53     A55
                                                                                   Q524             U9
                                                                                             A28
             A43         A26                                                                                  A10                      A10
                                                                                                                                       A58                            A61
                                                              A10         Q526     Q528                     A67
                     A43
 F901                                                   A34                          A10
                                    F904    F903                                                                         A50
F902                                                                                                                             A52     A63
                                                                                   A16
                                   U10                                                                                                                         A65
                                 T901                                                                                                                                     A64
                                                                                                                                                       A66    A11
        U4                                                                                                                                       A11
                                                                   E860




                                  A73

                                                                                           A73
                                                                                                                                                                           A-905TX

CHASSIS EXPLODED VIEW PARTS LIST
############
      REF NO.     PART NO.     DESCRIPTION                            REF NO.            PART NO.                 DESCRIPTION
      A1          27111123     Front bracket                          P402               27190011                 KGLS-6S, Holder
      A10         838130088    3TTB+8B, Self tapping screw            P584A              880009                   Plastic rivet, NRP-345 
      A11         838430088    3TTB+8B(BC), Self tapping screw        P701               27191106                 UAMS-05S-2, Holder
      A13         28198862     Facet, VOL                             P801               25055436 or              NPLG-2P418, Shorted plug
      A16         27100375D    Chassis                                                   25055945
      A25         27160451B    Heat sink 
                         P901               253277MIL                AS-UC-2#18, Power supply cord 

                  27160452B    Heat sink                                             253193HIT                AS-CEE, Power supply cord 
      A26         29110083     Adhesive tape, CROSS-16U               Q523,Q524          2202303 or         *     2SC4512-O or
      A27         801525       3TTB+8B(BC), Special screw                            2202304 or         *     2SC4512-Y or
                  838430088    3TTB+8B(BC), Self tapping screw 
                      2202305            *     2SC4512-P, Transistor
      A28         801433       3SMS8W.SW+14B(BC), special screw       Q525,Q526          2202313 or         *     2SA1726-O or
      A34         27141530A    Retainer, HS-2                                            2202314 or         *     2SA1726-Y or
      A40         27300750     Bussing cord                                              2202315            *     2SA1726-P, Transistor
      A41         27122831     Rear panel 
                        Q527,Q528          2212654 or         *     2SC3421-Y or
                  27122832     Rear panel                                            2212653            *     2SC3421-O, Transistor
      A43         830440089    4TTC+8C(BC), Self tapping screw        T901               2301423                  NPT-1374D, Power transformer 

      A46         28184759-1   Top cover                                                 2301424                  NPT-1374P, Power transformer 
      A47         29362571     Label, WARNING                  U1                 1A905530-4B              NADG-6630-4B, Main circuit PC board ass'y 

      A49         838930088    3TTB+8B(UN), Self tapping screw                           1A905530-4C              NADG-6630-4C, Main circuit PC board ass'y 
      A50         838430107    3TTB+10S(BC), Self tapping screw       U2                 1A905531-4B              NAAF-6631-4B, Preamplifier circuit PC board ass'y 

      A51         27212298     Front panel                                               1A905531-4C              NAAF-6631-4C, Preamplifier circuit PC board ass'y 
      A52         28198894     Facet 7P                               U3                 1A905532-4B              NAAF-6632-4B, Acoustic circuit PC board ass'y 

      A53         28198895     Facet 1P                                                  1A905532-4C              NAAF-6632-4C, Acoustic circuit PC board ass'y 
      A54         28198925     Facet A                                U4                 1A905533-4B              NAPS-6633-4B, Power supply circuit PC board ass'y 

      A55         27268037     Guide A                                                   1A905533-4C              NAPS-6633-4C, Power supply circuit PC board ass'y 
      A56         28325133     Knob, FM                               U5                 1A905534-4B              NADIS-6634-4B, Display circuit PC board ass'y 

      A58         28191798     Clear plate, RE                                           1A905534-4C              NADIS-6634-4C, Display circuit PC board ass'y 
      A61         28325926     Knob, INPUT                            U7                 1A905536-4B              NAETC-6636-4B, Speaker terminal PC board ass'y 

      A63         28135247Y    Badge                                                     1A905536-4C              NAETC-6636-4C, Speaker terminal PC board ass'y 
      A64         28325925     Knob, VOL                              U8                 1A905537-4B              NAETC-6637-4B, Terminal PC board ass'y 

      A65         28325674     Knob, TD                                                  1A905537-4C              NAETC-6637-4C, Terminal PC board ass'y 
      A66         28325927     Knob, TONE                             U9                 1A905539-4B              NAETC-6639-4B, Power switch PC board ass'y 

      A67         28325673     Knob, POWER                                               1A905539-4C              NAETC-6639-4C, Power switch PC board ass'y 
      A73         27175323     Leg AS                                 U10                1A905540-4C              NAETC-6640-4C, Fuse PC board ass'y 
      A81         29362630     Label, PROCESSOR
      F901        252158       1.6A-UL/T-237, Fuse 

                  252069       0.8A-SE-EAK FSBFUSE, Fuse 
      F902-F904   252075       2.5A-SE-EAK FUSE 
                                                                      NOTE:
                                                                      
 : Asian model only for 120V
       NOTE: THE COMPONENTS IDENTIFIED BY MARK                         : Asian model only for 230V
             ARE CRITICAL FOR RISK OF FIRE AND                        CAUTON :
             ELECTRIC SHOCK. REPLACE ONLY WITH                        Replacement of the transistor of mark * ,if necessary,
             PART NUMBER SPECIFIED.                                   must be made from the same beta group(HFE) as the
                                                                      original type.
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             A-905TX
                                   A                                                                                         B                                                                                              C                                                                                                       D                                                                                                                                                 E                                                                                                  F                                                                                                                                                                                         G
    SCHEMATIC DIAGRAM-1
                                                                                                                                                                                               TO NAAF-6631
                                                                                                                                                                                P405B                               P405C




                                                                                                                                                                                                 POWER2

                                                                                                                                                                                                          R

                                                                                                                                                                                                          R
                                                                                                                                                                                                          E
                                                                                                                                                                                        E
                                                                                                                                                                                        L

                                                                                                                                                                                        L
             NADG-6630                                                                                                                                                                                                                Acoustic Presence                                       AMP&VR
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              R551
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              2.2                                                                     SUBWOOFER PREOUT
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  R543                       (1/2W)
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  100                        24.6                                                                               P582
                                                                                                                                                                                                                                                                                                                                                                                                                                                            24.1 (1/2W)                                            Q523
                           P307                                                                                                                                                                                                                                                                                                                                                                                                                                                                Q519

1                                          R351    R353                                                                             Q301                                                                                                                                                                                                                                                                                                     1.2                                               2SA965             2SC4512               Q531
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                R581
                           LEFT                                                                                                  TC9273N-010                                                                                                                                                                                                                                                                                                                                                    L503                                    2SC1845
                                          2.2K     1M                                                                                                                                                                                                                                                                                                                                                                                      Q527                           R547                                               R603                                                680
                                                                                                                                                                                                                                                                                                                                                                                                                               R571       2SC3421         Q515                                                               680
                  REC                                                                                                        1 VEE              VDD 28                                                                                                                                                                                                                                                                                                                     15                                      R601
                                           R352    R354                                                                                                                                                                                                                                                                                                                                                                         220                       2SC1845                                                                                                        R582
                                                                                                                                                                                                                                                                                                                                                                                                                                                                         (1/2W)                                                                                                                                                                                                 SPEAKERS
                                                                                                                                                                                                                                                         TO NAAF-6632                                                                                                                         TO NAAF-6631                     R567                                                                                 1K                                                   10K
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    SPEAKER TERMINAL PC BOARD
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    U7
                          RIGHT           2.2K     1M                                                                                                                                                                                 TO NAAF-6632                                                                                                                                                                                                                                                 R557                                       R607                                                                                                                 C581 471
                                                                                                                             2           CDR-P      27                                                                      P401A                       P403A                 P501A                    TO NAAF-6631                                                                            P502A                           1.8K                                                                10 (1/2W)




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          JL581C
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   C531




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           JL581A
         CDR/PC                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               10K                        R583
                           P301                                                                                                                                                                                                                                                                                                                                                                                                                                         C515 R555                                  223Z
                                                                                                                                                                                                                                                                                                                                                                                                                              R569                                                                    R561
                                          R301    R303 *C301                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             10K




                                                                      C309
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        10/16 82




                                                                                                                                                                                                                                                              MUTING
                                                                               101
                                                                                                                             3           CD         26




                                                                                                                                                                                                                                                                            +B1
                                                                                                                                                                                                                                                             S.BASS3
                                                                                                                                                                                                                                                             S.BASS2
                                                                                                                                                                                                                                                             S.BASS1
                                                                                                                                                                                                                                                             POWER2




                                                                                                                                                                                                                                                                            -B1




                                                                                                                                                                                                                                                                                                                                                                                              +B1
                           LEFT                                                                                                                                                                                                                                                                                                                                                                                              1.2K                                                                     0.22*2        L501




                                                                                                                                                                                                                                                                                          NF-L




                                                                                                                                                                                                                                                                                                                                                                                              -B1
                                                                                                                                                                                                                                                                                                                                                   NF-R
                                                                                                                                                                                                                                                                                                                                                                                                                                                     Q529                                                                                                                RL901




                                                                                                                                                                                                                             +B2
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       L




                                                                                                                                                                                                                             -B2
                                          330                                                                                                                                                                                                                                                                                                                                                                                                                                (1/2W)




                                                                                                                                                                                                                                                                                                                                                                                                       E
                                                                                                                                                                                                                              R

                                                                                                                                                                                                                              R
                                                                                                                                                                                                                              E

                                                                                                                                                                                                                              E

                                                                                                                                                                                                                              E
                                                  1M         101K




                                                                                                                                                                                                                              L

                                                                                                                                                                                                                              L
                                                                                                                                                                                                                                                                                                                                                                                                                                                     2SC1740S




                                                                                                                                                                                                                                                                                                                  R
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       (2W)




                                                                                                                                                                                                                                                                                                                  E
                                                                                                                                                                                                                                                                                                             L
                  PLAY                                                                                                       4           TU         25
                                          R302    R304                                                                                                                                                                                                                                                                                                                                                                                                                                                              R563
                          RIGHT                                                                                                                                                                                                                                                                                                                                                                                                          R575                                                                        4.7                                                  RL901                                                                                                                                    R
                                          330     1M      *C302                                                              5           L/DVD      24                                                                                                                                                                                                                                                                                   500B                                                      R559             (1/2W)
                                                                                                                                                                                                                                                                                                                                                                                                                                                            Q517                                    10 (1/2W)
                                                           101K                                                                                                                                                                                                         R595                                                                                                                                                   R573                        2SA992                   R549
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      C517




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             P585A
                                                                                                                                                                                                                                                                          10                                                                                                                                                   220




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         P585B
                                          R305    R307 *C303                                                                                                                                                                                                                                                                                                                                                                                                                                L505                    R605                                                                                                                                                                 P584
                                                                                                                             6           MD-R       23                                                                                                                 (1/2W)                                                                                                                                                                                                15                                                                       473
                           LEFT                                                                                                                                                                                                                                                                                                                                                                                                                                         (1/2W)                                      820
                                          330     1M         101K                                                                                                                                                                                                                   R593                                                                                                                                                    -1.2                                               Q521
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                Q525 2SA1726                           R565                                                                                                                      C582
              CD                                                                                                             7           MD-P       22                                                                                                                              10                                                                                                                                                                              -24.1                     2SC2235
                                                  R308                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 8.2                   C923                                                                                                471
                                          R306                                                                                                                                                                                                                                     (1/2W)                                                                                                                                                                           R545                     -24.6                                                    (1/2W)                 223Z
                          RIGHT                                                                                                                                                                                                                                                                                                                                                                                                                                      100




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            P586A




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         P586B
                                                  1M      *C304                                                                                                                                                                                                                                                                                                                                                                                                                               R553
                                          330                                                                                8           T-R        21                                                                                                                                                                                                                                                                                                              (1/2W)                    2.2 (1/2W)
                                                           101K                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      -B1
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   POWER SWITCH PC BOARD
                  REC
                           P302
                           LEFT
                                          R309
                                          2.2K
                                                  R311
                                                  1M
                                                                                                                             9

                                                                                                                            10
                                                                                                                                         T-P        20

                                                                                                                                                    19
                                                                                                                                                                                                                                                                                                                                                                                                                R594 10 (1/2W)
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               R552
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  +B1
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             D919
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     NAETC-6636                                                     U9
                                                  R312                                                                                                                                                                                                                                                                                                                                                                                                                                         2.2
                                          R310                                                                                                                                                                                                                                                                                                                                                                                                                       R544                     (1/2W)
                          RIGHT
                                          2.2K    1M
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