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                                                                                                                                                                                                                              TX-SR303/303E

                                                                                                                                                                                 Ref. No. 3862
                                                                                                                                                                                       042005
                                              SERVICE MANUAL

                                              AV RECEIVER
                         MODEL TX-SR303
                         MODEL TX-SR303E                                                                                                                                           ON        STANDBY
                                                                                                                                                                                                           REMOTE MODE
                                                                                                                                                                                                           RECEIVER    DVD
                                                                                                                                                                                                          TAPE/AMP
                                                                                                                                                                                        INPUT SELECTOR

                                                                                                                                                                                    1             2             3       CD

                                                                                                                                                                                   V1            V2            V3


                                                                                                                                                                                    4             5             6      MD

                                                                                                                                                                                             MULTI CH          DVD


                                                                                                                                                                                    7             8             9      CDR

                                                                                                                                                                                  TAPE        TUNER            CD


                                                                                                                                                                                  +10             0            CLR
                                                                                                                                                                                  --/---      DIMMER       SLEEP




                                                                                                                                           TUNING / PRESET                                                     CH      VOL
                                                                                                                                                                MASTER VOLUME                                  DISC




                                                                                                                                                                                TOP MENU                              MENU
  STANDBY/ON

                                                                                                                                                                                 SP A / B                             MUTING


                                                                                                                                               ENTER                                                   ENTER



               STANDBY


                                                                                                                                                                                 RETURN                               SETUP




A SPEAKERS B              TONE            +       STEREO    LISTENING MODE        DISPLAY DIGITAL INPUT   DIMMER   MEMORY TUNING MODE     RETURN        SETUP



                                                                                                                          CLEAR
                                                                                                                                                                                              LISTENING MODE
                                                                                                                                                                                 STEREO        SURROUND

   PHONES
                         MULTl CH   DVD       VIDEO 1/VCR    VIDEO 2         VIDEO 3                               TAPE           TUNER            CD                            AUDIO SUBTITLE RANDOM REPEAT
                                                                                                                                                                                 TEST TONE     CH SEL      LEVEL-     LEVEL+

                                                                                                                                                                                             PLAY MODE
                                                                                                                                                                                 DISPLAY                   L NIGHT    CINE FLTR




                                                                                                                                                                                                      RC-605S




                                                                                                                                                                                RC-605S

                            TX-SR303 Silver model
                                    MDD                                120V AC, 60Hz

                            TX-SR303E Silver model
                                    MPP                                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.
                                                                                                                                      TX-SR303/303E

SPECIFICATION

Amplifier Section                                                         General
Power Output                                                              Power Supply                       North American: AC 120 V, 60 Hz
2 channel driven:                 North American: 65 W + 65 W                                                European: AC 230-240 V, 50 Hz
                                  (8 , 20Hz-20kHz, FTC)                   Power Consumption                  North American: 4.2 A
                                  European: 90 W + 90 W (6 , 1kHz, DIN)                                      European: 360 W
Dynamic Power                     160 W + 160 W (3 , Front)               Stand-by Power Consumption         North American: 0.1 W
                                  125 W + 125 W (4 , Front)                                                  European: 0.2 W
                                  85 W + 85 W (8 , Front)                 Dimensions
THD                                                                       (W x H x D)                        435 x 150 x 369 mm
(Total Harmonic Distortion)       0.08% (Power Rated)                                                        17-1/8" x 5-7/8" x 14-1/2"
Damping Factor                    60 (Front, 1kHz, 8 )                    Weight                             North American and European: 8.5 kg
Input Sensitivity and Impedance   200 mV/ 47 k (LINE)                                                                                   18.7 lbs.
Output Level and Impedance        200 mV/ 470 (REC OUT)
                                                                            Video Inputs
Frequency Response                10 Hz-100 kHz/ +1 dB-3 dB (Direct
                                                                          Composite                          DVD, VIDEO1, VIDEO2, VIDEO3
                                  mode)
Tone Control                        10 dB, 50 Hz (BASS)                     Video Outputs
                                    10 dB, 20 kHz (TREBLE)                Composite                          MONITOR OUT, VIDEO1
Signal to Noise Ratio             100 dB (LINE IHF-A)                       Audio Inputs
Speaker Impedance                 6 -16                                   Digital Inputs                     Optical: 1
Video Section                                                                                                Coaxial: 1
Input Sensitivity/Output Level                                            Analog Inputs                      DVD(MULTICHANNEL), VIDEO1,
and Impedance                     1 Vp-p /75   (Composite)                                                   VIDEO2, VIDEO3, TAPE, CD
                                                                          Multichannel Inputs                6

Tuner Section                                                               Audio Outputs
                                                                          Analog Outputs                     TAPE, VIDEO1
  FM
                                                                          Subwoofer Pre Outputs              1
Tuning Frequency Range            North American: 87.5 MHz-107.9 MHz
                                                                          Speaker Outputs                    SP-A (L, R, C, SL, SR) + SP-B (L, R)
                                  European: 87.5 MHz-108.0 MHz
                                                                          Phones                             1
Usable Sensitivity                Stereo: 17.2 dBf 2 V(75 IHF)
                                  Mono: 11.2 dBf 1 V(75 IHF)
Signal to Noise Ratio             Stereo: 70 dB (IHF-A)                   Specifications and features are subject to change without notice.
                                  Mono: 76 dB (IHF-A)
THD                               Stereo: 0.3% (1kHz)
                                  Mono: 0.2% (1kHz)
Frequency Response                30 Hz-15 kHz / 1 dB
Stereo Separation                 45 dB (1kHz)
  AM
Tuning Frequency Range            North American: 530 kHz-1710 kHz
                                  European: 531 kHz-1611 kHz
Usable Sensitivity                30 V
Signal to Noise Ratio             40 dB
THD                               0.70%
                                                                                                                               TX-SR303/303E

SERVICE PROCEDURE
1. Replacing the fuses

                   This symbol located near the fuse indicates that the
   fuse used is show operating type, For continued protection against
   fire hazard, replace with same type fuse, For fuse rating, refer to
   the marking adjacent to the symbol.

                 Ce symbole indique que le fusible utilise est e lent.
   Pour une protection permanente, n'utiliser que des fusibles de meme
   type. Ce demier est indique la qu le present symbol est apposre.

    REF NO.       PART NAME          DESCRIPTION               PART NO.     REMARKS           
    F901          FUSE               6.3A-UL/T-237             252166       !, 
: TX-SR303 USA model Only F901 or FUSE 6.3A-T/UL-ST2 252260 !,
: TX-SR303E European model Only F902 FUSE 3.15A-SE-EAK FUSE 252076 !, F902 or FUSE 3.15A-SE-TL250V 252242 !, F902 or FUSE 3.15A-SE-TL250V 252276 ! F6901 FUSE 8A-UL 252198 ! F6901 or FUSE 8A-T/UL-ST2 252261 ! F6902 FUSE 8A-UL 252198 ! F6902 or FUSE 8A-T/UL-ST2 252261 ! 2. Safety-check out (Only U.S.A. model) After correcting the original service problem perform the following safety check before releasing the set to the customer Connect the insulating-resistance tester between the plug of power supply cord and terminal GND on the back panel. Specifications: More than 10Mohm at 500V 3. To initialize the unit 1. Press and the hold down the VIDEO 1/VCR button , then press the STANDBY/ON button when the unit is Power on. 2. After " Clea r " is displayed, the preset memory and each mode stored in the memory, are initialized and will return to the factory settings. 4. To check version of microprocessor Main microprocessor Q701 only. 1. Press and the hold down the DISPLAY button , then press the STANDBY/ON button when the unit is Power on. Version is displayed on FL display only for 3 seconds. Ex. V er.0.5 0 /05131a 2. Press the STANDBY/ON button to Power off. 5. Memory Backup The AV receiver uses a battery-less memory backup system in order to retain radio presets and other settings when it's unplugged or in the case of a power failure. Although no batteries are required, the AV receiver must be plugged into an AC outlet in order to charge the backup system. Once it has been charged, the AV receiver will retain the settings for several weeks, although this depends on the environment and will be shorter in humid climates. TX-SR303/303E OPERATION CHECK-1 SPEAKER PROTECT-1 (DC VOLTAGE DETECTION) [When] 1. Exchange power transistors (Q6050 - Q6064). 2. Exchange amplifier PC board ass'y (NAAF-8523). [Procedure] No load. No input. 1. Press and the hold down the CD button , then press the STANDBY/ON button when the unit is Power ON. "Test - _" is displays it only for 5 seconds. Test - _ Blinks 2. Press the VIDEO 3 button, while the character of "Test - _" is displayed. Unit will be in the state of " Test-4-00 ". Test - 4 -00 3. Repeatedly press TONE+ button until the character of " Test-4-21 " is displayed. Test - 4 -21 Checking the operation starts automatically as follows. Test - 4 -21 ------- Front L ch Check P rote ct OK Test - 4 -22 ------- Front R ch Check P rote ct OK Test - 4 -23 ------- Center ch Check P rote ct OK Test - 4 -24 ------- Surround L ch Check P rote ct OK Test - 4 -25 ------- Surround R ch Check P rote ct OK P rote ct If all channel are OK, the character of " Test - 4 - 35 " is displayed. Test - 4 -35 4. Press the STANDBY/ON button. Turn off Cle a r TX-SR303/303E OPERATION CHECK-2 SPEAKER PROTECT-2 (CURRENT DETECTION) [When] 1. Exchange power transistors (Q6050 - Q6064). 2. Exchange amplifier PC board ass'y (NAAF-8523). [Procedure] No input. Do not check two or more channels at the same time. Do not connect dummy load to speaker terminals fro seconds 2 or more. 1. Press and the hold down the CD button , then press the STANDBY/ON button when the unit is Power ON. "Test - _" is displays it only for 5 seconds. Test - _ Blinks 2. Press the VIDEO 3 button, while the character of "Test - _" is displayed. Unit will be in the state of " Test-4-00 ". Test - 4 -00 3. Repeatedly press TONE+ button until the character of " Test-4-35 " is displayed. Test - 4 -35 4. Connect the Dummy load of 3 ohms to the Front Lch speakers terminal. At this time, check the speaker relay is not turned off. Test - 4 -35 5. Connect the dummy load of 1 ohm to the Front Lch speakers terminal. At that time, you check the speaker relay is turned off and "Protect" is displayed. P rote ct Disconnect the dummy load at once when check the display of "Protect". Test - 4 -35 6. Check other channels according to the same procedure. 7. Press the STANDBY/ON button. Turn off Clear TX-SR303/303E OPERATION CHECK-3 CONTROL OF POWER SUPPLY (OUTPUT SENSOR AND THERMAL SENSOR) [When] 1. Exchange power transistors (Q6050 - Q6064). 2. Exchange power amplifier PC board ass'y (NAAF-8523). 3. Exchange thermal sensor PC board ass'y (NAETC-8526). [Procedure] No output. No input. Output sensor 1. Press and the hold down the CD button , then press the STANDBY/ON button when the unit is Power ON. "Test - _" is displays it only for 5 seconds. Test - _ Blinks 2. Press the VIDEO 3 button, while the character of "Test - _" is displayed. Unit will be in the state of " Test-4-00 ". Test - 4 -00 3. Repeatedly press TONE+ button until the character of " Test-4-37 " is displayed. Test - 4 -37 4. Adjusts MASTER VOLUME to Max. position. At this time, check the character of "FM STEREO" displayed. And, check relay RL6901 and RL6902 are turned off in 2- 3 seconds. FM STEREO Test - 4 -37 5. Press the STANDBY/ON button. Turn off Cle a r Thermal sensor 1. Press and hold down the DISPLAY button, then press the STANDBY button when the unit is power ON. " V er . 0. 50 /0 5 1 3 1 a " is displays it only for 2 seconds. V er. 0 .50/0 5 1 3 1 a 2. Press the TONE button, while the character of "Ver.0.50/05131a" is displayed. T: 2 5 C/ 7 7 F 3. Check the displayed temperature is +/-20 C of the ambient temperatures. 4. Press STANDBY/ON button. Turn off Cle a r TX-SR303/303E OPERATION CHECK-4 DSP DEBUG MODE Check the operation of the circuit around DSP by the display in this mode. This information helps to pursue the faulty point. To set in DSP debug mode 1. Press and hold down the DISPLAY button, then press the STANDBY button when the unit is power ON. " V er . 0. 50 /0 5 1 3 1 a " is displays it only for 2 seconds. V e r. 0.5 0 /0513 1 a 2. Press the DISPLAY button, while the character of "Ver.0.50/05131a" is displayed. E 1 A 4 8 K 0 1 5 FF 2 3 o To exit Press STANDBY/ON button. Content of display 1 2 3 4 5 6 7 8 9 10 --------- DIR --------- ------ MEMORY/DOWNLOAD ----- ------------------------- DSP ---------------------------------------- 1 UNLOCK 6 AUTOBOOT DSP AB CODE 8 DSP Status E = UNLOCK 0 = FLASH 00 = Power off 21 = DSP C HW Config set = LOCK 1 = ab_ac3_pl2 01 = Power on wait 22 - 2A = DSP C SW Config set 2 = ab_dts_pl2 10 = DSP reset 3F = DSP C kick start 2 Digital Selecter 3 = ab_neo6 11 = DSP reset wait 40 = DSP AB App start D = DIGITAL 4 = sgen_ab 12 = DSP AB boot ready 41 = DSP AB HW Config set A = ANALOG 5 = ab_pl2fs 13 = DSP AB boot start 42 - 4B = DSP AB SW Config set 1 = COAX1 6 = ab_dts_6dol 14 = DSP AB boot AF = DSP ab kick start 2 = OOAX2 7 = ab_dts9624 15 = DSP C boot ready 3 = OPT1 8 = aac_pl2 16 = DSP C boot start 4 = OPT2 17 = DSP C boot 5 = OPT3 18 = DSP soft reset 7 = FRONT 7 AUTOBOOT DSP C CODE 20 = DSP C app start 0 = ac_dts9624 3 Sampling Frequency 1 = c_neo6 96 = 96kHz 2 = c_oos_no_sd 9 DSP Detect Format 48 = 48kHz 3 = c_oos 00 = Null 0B = DTS1 44 = 44kHz 4 = c_oob 01 = Dolby Digital 0C = DTS2 32 = 32kHz 5 = c_pl2 03 = Pause 0D = DTS3 -- = Not detect 6 = c_pl2xthx 04 = MPEG1 L1 1B = MPEG2 AAC1 7 = c_thx 05 = MPEG1 L23/ MPEG2 w/o 1C = MPEG2 AAC2 4 Pre Emphasis 8 = c_spsetup 06 = MPEG2 w/e 20 = Silent K = OFF 9 = version 07 = MPEG2 AAC 22 = DTS CD e = ON 08 = MPEG2 L1 23 = PCM 5 DIR Status 09 = MPEG2 L2/3 0 = ANALOG 1 = PCM 10 DSP Decode 2 = NOT_PCM o = Decode OK 3 = DATA x = Decode NG 4 = DTSCD -- = Analog in 5 = MCH 6 = NOT DECIED TX-SR303/303E A004 EXPLODED VIEWS-1 x 4 pcs. A025 P901 A003 x 27 pcs. A050 A051 A401 A014 x 6 pcs. A028 U16 U02 A004 U17 A040 Refer to A004 in P101 x 3pcs EXPLODED VIEWS-2 U18 A004 A046 A048 F6901 x 4 pcs. A450 F6902 U09 A052 U15 A004 A045 U08 F901 U05 A025 A001 A025 A002 A023 x 13 pcs. P703 x 4 pcs. U06 U11 U14 A004 x 2 pcs. A004 A413 A004 A004 x 3 pcs. A405 U13 A014 A030 A412 T901 U01 A011 A430 A003 x 2 pcs. A406 U03 A411 A010 A004 A055 U04 x 4 pcs. A065 TX-SR303/303E A056 A420 A016 x 8 pcs. x 2 pcs. A003 A013 A015 x 3 pcs. x 6 pcs. A004 x 3 pcs. x 8 pcs. TX-SR303/303E EXPLODED VIEWS-2 Q6050A x10 A037 x10 Q6054 Q6064 Q6053 Q6063 Q6052 Q6062 Q6051 Q6061 Q6050 Q6060 TX-SR303/303E TX-SR303/303E A B C D BLOCK DIAGRAM AUDIO SECTION TUNER UNIT 1 51 NJW1157 52 53 41 + 42 46 CD 8 54 43 + 44 45 8 48 55 47 -6dB 8 TAPE OUT 8 56 57 8 9 TAPE IN 58 2 59 8 9 27 4 VIDEO3 IN 29 Z2_L 25 60 3 28 26 8 30 Z2_R 2 MIX_L 9 61 27 MIX_R +9.7dB -6dB INVERT 62 8 9 NJU7311 63 VIDEO2 IN 21 12 RECOUT_L 7 VOLIN_SBL 8 64 23 9 25 65 22 RECOUT_R 17 22 VOLIN_SBR 8 VIDEO1 OUT 24 9 66 26 11 18 67 VIDEO1 IN SOURCE_L 10 5 3 68 SOURCE_R 19 9 24 6 23 69 20 L ADRT+ ADLT+ ADRT- ADLT- 8 FRONT 21 MCH_SW 70 DAC_SW MCH_SR MCH_CT R DAC_SR MCH_SL DAC_FR DAC_CT DAC_SL DAC_FL DVD TAPE_OUT_R TAPE_OUT_L V2_OUT_R (MULTI INPUT) V2_OUT_L 71 L SURR. 73 R 73 CENTER 74 SUBWOOFER 4 ADRT+ ADLT+ ADRT- ADLT- 16 DIGITAL IN 15 14 2ch ADC COAXIAL 13 LPF LPF LPF LPF LPF RX0 49 36 37 35 34 32 33 31 30 28 48 43 OPTICAL RX2 47 46 DIR 45 44 42 5 50 8ch DAC CS42518 TX-SR303/303E E F G H PHONES POWER AMPLIFIER +29dB SPEAKERS L VOLUME FRONT-A 80 +29dB 88 1 FL_PO TONE R 81 89 2 FR_PO TONE +29dB CENTER 82 90 3 CT_PO A +29dB 87 +20.2dB 95 8 SW_PO L A SURROUND 83 91 4 SL_PO +29dB R 84 92 5 SR_PO 85 L 93 6 PREOUT SUBWOOFER FRONT-B 86 94 7 R SPRLCS SPRLF Z2RL HPIN SBMUT AMUT 4M Bit FLASH ROM MX29LV040 LPF LPF 28 29 27 26 22 23 21 20 62 110 RI 63 109 INTERFACE RI 64 107 1 106 58 118 DSP C 54 86 CS494003 134 81 80 To Microprocessor TX-SR303/303E A B C D SCHEMATIC DIAGRAMS-1 TO NADG-8514 AUDIO INPUT SECTION TUPACK_R TUPACK_L VIDEO4_R NAAF-8523 (1/2) VIDEO4_L VLTNDAT VLTNCLK VLTNSTB FSWDAT FSWCLK DAC_SBR FSWSTB DAC_FL U05 MIC AMPLIFIER PC BOARD P5505 A_GND 1 FSWSTB FSWCLK FSWDAT DAC_SBR V1OUT_R DAC_FR TAPEOUT_R Z2_R 4 R5581 R5583 R5582 5 220 220 220 DMIXR 7 10K Q5503 6 R5591 10K CK 16 DATA 17 NC 18 19 R7 20 21 R6 22 R5 23 24 R4 25 R3 26 27 R2 28 R1 29 VDD 30 R5590 470 1.2K R_COM2 NJU7311AM R_COM4 R_COM3 R_COM 330J C5590 Q5502



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