Service Manuals, User Guides, Schematic Diagrams or docs for : Daewoo Audio AMI 921 daewoo_ami921__hi_144

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     Service Manual
     MINI COMPONENT SYSTEM

     Model : AMI-921DP / 921DPR




DAEWOO ELECTRONICS CO., LTD.
TABLE OF CONTENTS
SAFETY PRECAUTIONS ................................................................................................. 2
ADJUSTMENTS ............................................................................................................. 4
EXPLODED VIEW AND PARTS LIST ................................................................................ 7
WIRING DIAGRAM ..................................................................................................... 9
BLOCK DIAGRAM ...................................................................................................... 10
SCHEMATIC DIAGRAM ............................................................................................... 11
 POWER / AMP ...................................................................................................................................11
 CD ...................................................................................................................................................12
 TUNER ...............................................................................................................................................13
 TAPE .................................................................................................................................................16
 CONTROL .........................................................................................................................................17

PCB PATTERN LAYOUT ................................................................................................. 18




                                                                                   1
 SAFETY PRECAUTIONS
WARNING: TO PREVENT FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE                  laundry tub, in a wet basement, or near a swimming pool,
THIS APPLIANCE TO RAIN OR MOISTURE.                                        and the like.
                                                                                                 2. Carts and Stands - The appliance
                          CAUTION                                            PORTABLE CART
                                                                                                    should be used only with a cart or
                  RISK OF ELECTRIC SHOCKS                                                           stand that is recommended by th
                        DO NOT OPEN                                                                 manufacturer.
                                                                                                 3. An appliance and cart combination
 CAUTION :TO REDUCE THE RISK IF ELECTRIC SHOCK, DO NOT                                              should be moved with care. Quick
          REMOVE COVER (OR BACK). NO USER SERVICEABLE PARTS                                         stops, excessive force, and uneven
          INSIDE.                                                                                   surfaces may cause the appliance
          REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.                                           and cart combination to overturn.
                                                                                  Figure 2       4. Wall or Ceiling Mounting - The appli-
          THIS SYMBOL IS INTENDED TO ALERT THE USER TO THE
          PRESENCE OF UNINSULTED "DANGEROUS VOLTAGE"                                               ance should be mounted to a wall or
          WITHIN THE PRODUCT'S ENCLOSURE THAT MAY BE                        ceiling only as recommended by the manufacturer.
          SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF                  5. Ventilation - The appliance should be situated so that its
          ELECTRIC SHOCK TO PERSONS.                                       location or position does not interfere with its proper
                                                                           ventilation. For example, the appliance should not be situated
          THIS SYMBOL IS INTENDED TO ALERT THE USER TO THE
          PRESENCE OF IMPORTANT OPERATING AND MAINTENANCE                  on a bed, sofa, rug, or similar surface that may block the
          (SERVICING) INSTRUCTIONS IN THE LITERATURE                       ventilation openings; or, placed in a built-in installation, such
          ACCOMPANYING THE APPLIANCE.                                      as a bookcase or cabinet that may impede the flow of air
                                                                           through the ventilation openings.
                          CAUTION                                       6. Heat - The appliance should be situated away from heat
 TO PREVENT ELECTRIC SHOCK, DO NOT USE THIS POLARIZED AC
                                                                           sources such as radiators, heat registers, stoves, or other
 PLUG WITH AN EXTENSION CORD, RECEPTACLE OR OTHER OUTLET
 UNLESS THE BLADES CAN BE FULLY INSERTED TO PREVENT BLADE                  appliances (including amplifiers) that produce heat.
 EXPOSURE.                                                              7. Power Sources - The appliance should be connected to a
                                                                           power supply only of the type described in the operating
                       LASER SAFETY                                        instructions or as marked on the appliance.
THIS UNIT EMPLOYS A LASER. ONLY QUALIFIED SERVICE PERSONNEL
                                                                        8. Grounding or Polarization - The precautions that should be
SHOULD REMOVE THE COVER OR ATTEMPT TO SERVICE THIS DEVICE
DUE TO POSSIBLE EYE INJURY.                                                taken so that the grounding or polarization means of an
                                                                           appliance is not defeated.
CAUTION : USE OF ANY CONTROLS, ADJUSTMENTS, OR PROCEDURES               9. Power - Cord Protection - Power-supply cords should be
OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT IN HAZARDOUS                  routed so that they are not likely to be walked on or pinched
RADIATION EXPOSURE.                                                        by items placed upon or against them, paying particular
                                                                           attention to cords at plugs, convenience receptacles, and the
CAUTION : TO PREVENT ELECTRIC SHOCK, MATCH WIDE BLADE OF
PLUG TO WIDE SLOT, FULLY INSERT.                                           point where they exit from the appliance.
                                                                        10.Protective Attachment Plug - The appliance is equipped with
ATTENTION : POUR EVITER LES CHOCS ELECTRIQUES, INTRODUIRE                  an attachment plug having overload protection. This is a
LA LAME LA PLUS LARGE DE LA FICHE DANS LA BORNE CORRESPON-                 safety feature. See Instruction Manual for replacement or
DANTE DE LA PRISE ET POUSSER JUSQU'AU FOND.                                resetting of protective device. If replacement of the plug is
                                                                           required, be sure the service technician has used a
                                                                           replacement plug specified by the manufacturer that has the
Important Safety Instructions                                              same overload protection as the original plug.
- All the safety and operating instructions should be read before       11.Cleaning - The appliance should be cleaned only as
  the appliance is operated.                                               recommended by the manufacturer.
- The safety and operating instructions should be retained for          12.Power Lines - An outdoor antenna should be located away
  future reference.                                                        from power lines.
- All warnings on the appliance and in the operating instructions
  should be adhered to.
- All operating and use instructions should be followed.
1. Water and Moisture - The appliance should not be used near
    water - for example, near a bathtub, washbowl, kitchen sink,




                                                                    2
                                                                                                               SAFETY PRECAUTIONS



13.Outdoor Antenna Grounding - If an outside antenna is                     15.Object and Liquid Entry - Care should be taken so that objects
   connected to the receiver be sure the antenna system is                     do not fall and liquids are not spilled into the enclosure through
   grounded so as to provide some protection against voltage                   openings.
   surges and built-up static charges. Article 810 of the National          16.Damage Requiring Service - The appliance should be
   Electrical Code, ANSI/NFPA 70, provides information with                    serviced by qualified service personnel when:
   regard to proper grounding of the mast and supporting                        a) The power-supply cord or the plug has been damaged; or
   structure, grounding of the lead-in wire to an antenna-dis                   b) Objects have fallen, or liquid has been spilled into the
   charge unit, size of grounding conductors,location of antenna-                  appliance; or
   discharge unit, connection to grounding electrodes and                       c) The appliance has been exposed to rain; or
   requirements for the grounding electrode. See Figure 1.                      d) The appliance does not appear to operate normally or
                                                                                    exhibits a marked change in performance; or
                                                                                e) The appliance has been dropped, or the enclosure
            EXAMPLE OF ANTENNA
            GROUNDING                            ANTENNA LEAD
                                                                                   damaged.
                                                 IN WIRE
                                                                            17.Servicing - The user should not attempt to service the
                                                                               appliance beyond that described in the operating instructions.
                   GROUND CLAMP                                                All other servicing should be referred to qualified service
                                               ANTENNA DISCHARGE UNIT
                                               (NEC SECTION 810-20)            personnel.
                                                GROUNDING CONDUCTORS
                      ELECTRIC                  (NEC SECTION 810-21)
                      SERVICE
                      EQUIPMENT
                                         GROUND CLAMPS
                                     POWER SERVICE GROUNDING
                                     ELECTRODE SYSTEM
    NEC - NATIONAL ELECTRICAL CODE   (NEC ART 250 PART H)


14.Non-use Periods - The power cord of the appliance should be
   unplugged from the outlet when left unused for a long period
   of time.




                                                                        3
 ADJUSTMENTS
1. TUNER SECTION                                                                       FM RF SSG                     FM Antenna
                                                                                                  Terminal(75 ohm)
     TEST EQUIPMENT
                                                                                       75 ohm Coaxal
1.   Signal Generator with a frequency range of FM broadcast.
                                                                                                            SET
2.   Oscilloscope with a side amplifier of approximately 100 KHz.
                                                                       Carrier Frequency : 98MHz
3.   FM 75/50 dummy antenna.                                           Output Level : 26dBuV
                                                                       Modulation:Audio 1kHZ, 75kHz Deviation
4.   VTVM
     FM ALIGNMENT
1.   Turn on the FM signal generator and the VTVM allowing 15 minutes warming-up period.
2.   Connect the VTVM across the headphone jack or speaker terminal.
3.   Set signal generator frequency as listed in ALIGNMENT CHART and maintain a sufficient output level to provide an
     indication on VTVM.
NOTE
1. Use a screwdriver with plastic or ceramic grip for all adjustments.
2. Standard test frequency 1 KHz and deviation 75 KHz for FM.
                                                   - FM RF, IF ALIGNMENT CHART -

 Step        Item         Input Circuit Setup       Output Circuit Setup       Tuner Setting       Adjust Point            Adjustment
                         Connect stereo signal                                FM98MHz75KHz
           FM IF                                     Connect DC voltme-
     1                   generator to FM ANT                                                           L203         Adjust forDC 0V



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