Service Manual
MINI COMPONENT SYSTEM
Model : TX-350 /TX-550
AKAI ELECTRONICS
CO.,
LTD.
MINI COMPONENT SYSTEM
TX-350/TX-550
Table of Contents
SAFETY PRECAUTIONS ......................................................................................... |
2 |
ADJUSTMENTS ....................................................................................................... |
4 |
EXPLODED VIEW AND PARTS LIST ...................................................................... |
5 |
WIRING DIAGRAM ................................................................................................... |
8 |
BLOCK DIAGRAM .................................................................................................... |
9 |
SCHEMATIC DIAGRAM ........................................................................................... |
10 |
POWER / AMP /TUNER / TAPE .................................................................................................... |
10 |
CD ................................................................................................................................................... |
11 |
CONTROL ........................................................................................................................................ |
12 |
PCB PATTERN LAYOUT ........................................................................................ |
13 |
ELECTRICAL PART LIST ....................................................................................... |
17 |
- 1 -
Safety Precautions
WARNING: TO PREVENT FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
CAUTION
RISK OF ELECTRIC SHOCKS
DO NOT OPEN
CAUTION :TO REDUCE THE RISK IF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK). NO USER SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
THIS SYMBOL IS INTENDED TO ALERT THE USER TO THE PRESENCE OF UNINSULTED "DANGEROUS VOLTAGE" WITHIN THE PRODUCT'S ENCLOSURE THAT MAY BE SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK TO PERSONS.
THIS SYMBOL IS INTENDED TO ALERT THE USER TO THE 
PRESENCE OF IMPORTANT OPERATING AND MAINTENANCE 
(SERVICING) INSTRUCTIONS IN THE LITERATURE ACCOMPANYING THE APPLIANCE.
CAUTION
TO PREVENT ELECTRIC SHOCK, DO NOT USE THIS POLARIZED AC PLUG WITH AN EXTENSION CORD, RECEPTACLE OR OTHER OUTLET UNLESS THE BLADES CAN BE FULLY INSERTED TO PREVENT BLADE EXPOSURE.
LASER SAFETY
THIS UNIT EMPLOYS A LASER. ONLY QUALIFIED SERVICE PERSONNEL SHOULD REMOVE THE COVER OR ATTEMPT TO SERVICE THIS DEVICE DUE TO POSSIBLE EYE INJURY.
CAUTION : USE OF ANY CONTROLS, ADJUSTMENTS, OR PROCEDURES OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.
CAUTION : TO PREVENT ELECTRIC SHOCK, MATCH WIDE BLADE OF PLUG TO WIDE SLOT, FULLY INSERT.
ATTENTION : POUR EVITER LES CHOCS ELECTRIQUES, INTRODUIRE LA LAME LA PLUS LARGE DE LA FICHE DANS LA BORNE CORRESPONDANTE DE LA PRISE ET POUSSER JUSQU'AU FOND.
Important Safety Instructions
-All the safety and operating instructions should be read before the appliance is operated.
-The safety and operating instructions should be retained for future reference.
-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,
laundry tub, in a wet basement, or near a swimming pool, and the like.
2. Carts and Stands - The appliance should be used only with a cart or stand that is recommended by th manufacturer.
3. An appliance and cart combination
should be moved with care. Quick
stops, excessive force, and uneven surfaces may cause the appliance and cart combination to overturn.
4. Wall or Ceiling Mounting - The appliance should be mounted to a wall or
ceiling only as recommended by the manufacturer.
5.Ventilation - The appliance should be situated so that its location or position does not interfere with its proper ventilation. For example, the appliance should not be situated on a bed, sofa, rug, or similar surface that may block the ventilation openings; or, placed in a built-in installation, such as a bookcase or cabinet that may impede the flow of air through the ventilation openings.
6.Heat - The appliance should be situated away from heat sources such as radiators, heat registers, stoves, or other appliances (including amplifiers) that produce heat.
7.Power Sources - The appliance should be connected to a power supply only of the type described in the operating instructions or as marked on the appliance.
8.Grounding or Polarization - The precautions that should be taken so that the grounding or polarization means of an appliance is not defeated.
9.Power - Cord Protection - Power-supply cords should be routed so that they are not likely to be walked on or pinched by items placed upon or against them, paying particular attention to cords at plugs, convenience receptacles, and the
point where they exit from the appliance.
10.Protective Attachment Plug - If the appliance is equipped with an attachment plug having overload protection. This is a safety feature. See Instruction Manual for replacement or 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 same overload protection as the original plug.
11.Cleaning - The appliance should be cleaned only as recommended by the manufacturer.
12.Power Lines - An outdoor antenna should be located away from power lines.
- 2 -
Safety Precautions
13.Outdoor Antenna Grounding - If an outside antenna is connected to the receiver be sure the antenna system is grounded so as to provide some protection against voltage surges and built-up static charges. Article 810 of the National Electrical Code, ANSI/NFPA 70, provides information with regard to proper grounding of the mast and supporting structure, grounding of the lead-in wire to an antenna-dis charge unit, size of grounding conductors,location of antennadischarge unit, connection to grounding electrodes and requirements for the grounding electrode. See Figure 1.
EXAMPLE OF ANTENNA |
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GROUNDING |
ANTENNA LEAD |
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IN WIRE |
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GROUND CLAMP |
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ANTENNA DISCHARGE UNIT |
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(NEC SECTION 810-20) |
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ELECTRIC |
GROUNDING CONDUCTORS |
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(NEC SECTION 810-21) |
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SERVICE |
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EQUIPMENT |
GROUND CLAMPS |
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POWER SERVICE GROUNDING |
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ELECTRODE SYSTEM |
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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.
15.Object and Liquid Entry - Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through openings.
16.Damage Requiring Service - The appliance should be serviced by qualified service personnel when:
a)The power-supply cord or the plug has been damaged; or
b)Objects have fallen, or liquid has been spilled into the appliance; or
c)The appliance has been exposed to rain; or
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
damaged.
17.Servicing - The user should not attempt to service the appliance beyond that described in the operating instructions. All other servicing should be referred to qualified service personnel.
- 3 -
Adjustments
TAPE SECTION
Output Level |
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Measurement |
Input Point |
Scope |
Point |
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R-CH |
47 kohm |
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VTVM |
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Input Level
Measurement
Point
L-CH |
47 kohm |
Test Tape be used
Tape |
Contents |
Use |
MTT-111N |
3 KHz |
Tape Speed Adjustment |
MTT-114N |
10 KHz |
Head Azimuth Adjustment |
MTT-5511 |
Blank |
Record Frequency Property |
HEAD ADJUSTMENT (AZIMUTH) |
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1.10KHz test tape(example: MTT-114N) must be used for this adjustment.
2.Connect to VTVM or oscilloscope to the headphone jack or speaker terminal.
3.Press the play button.
4.Adjust the azimuth by using a screw driver to maintain the max. L&R output voltage.
5.Adjust tape A(1), tape B(2) respectively, Please secure the azimuth position by using locking paint.
RECORDING BIAS OSCILLATOR FREQUENCY ADJUSTMENT
1.Connect the frequency counter to TP603, GND.
2.Press the REC button.
3.Adjust L603 to obtain 80 KHz±100Hz
Step |
Item |
Normal
1Tape Speed Adjustment
High
2Azimuth Adjustment Recording Bias Oscilla-
3tor Frequency Adjustment
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TAPE ALIGNMENT CHART |
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Reference Value |
Test Tape |
Adjust Point |
Test Point |
Note |
FIG. |
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3,015~3,025Hz |
MTT-111N |
RV601 |
Line Out L/R |
Confirm Wow & Flut- |
FIG.1 |
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Channel |
ter is within 0.35% |
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Line Out L/R |
Confirm Tape Speed |
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3,000~3,010Hz |
MTT-111N |
RV601 |
of end position after |
FIG.1 |
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Channel |
adjustment at tape |
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start position |
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Shorted |
Confirm High speed |
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5,820~6,180Hz |
MTT-111N |
- - - - - - |
TP601, |
after normal speed |
FIG.1 |
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TP602 |
adjustment |
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Maximum Level |
MTT-114N |
Head Screw |
Line Out L/R |
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FIG.2,3,4 |
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Phase:Within90° |
Channel |
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Adjust with frequency |
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TP603,GND |
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80 KHz±0.5 |
MTT-5511 |
L603 |
counter connected. |
FIG.1 |
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Adjust with Frequency |
Test Tape : MTT-111N(3kHz) |
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Counter Connected |
Frequency Counter |
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MTT-5511(Blank) |
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Set |
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Output Level |
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Measurement Point |
Forward |
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Side |
FIG. 1 : Tape Speed & Record Bias Oscillator |
FIG. 2 : Tape Azimuth Adjust Location |
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Frequency Adjust Circuit |
(Record/Playback Head) |
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L-CH |
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Peak |
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within |
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Level |
1 dB |
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within |
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Angle |
R-CH |
Output |
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1 dB |
Peak |
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Screw |
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L-CH |
R-CH |
Screw Angle |
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Peak |
Peak |
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FIG. 3 : Tape Azimuth Adjust Head Screw & Waveform
MTT-114N |
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(10kHz) |
Oscilloscope |
L-CH |
Set 
V H
Output Level
Measurement Point
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Screen Pattern |
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In Phase |
45 |
90 |
135 |
180 |
Good |
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Wrong |
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FIG. 4 : Tape Azimuth Adjust Circuit & Waveform
- 4 -
Exploded View and Mechanical Parts List
Model No:TX-350 / TX-550 |
- 5 - |
Exploded View and Mechanical Parts List
Model No: TX-350/550
NO |
PARTS NAME |
CODE NO |
DESCRIPTIONS |
Q'ty |
REMARKS |
1 |
PANEL FRONT |
9CD0307100 |
MIPS |
1 |
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2 |
BADGE DAEWOO |
9CD1500900 |
ABS |
1 |
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3 |
DOOR CASSETTE A/B |
9CD1810500 |
MIPS |
1 |
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4 |
WINDOW DOOR A/B |
9CD16153B0 |
ACRYL |
1 |
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5 |
DOOR FRAME A/B |
9CD18113A0 |
ABS |
1 |
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9CD18113B0 |
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6 |
SRING DOOR EJECT L/R |
9CD3007800 |
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1 |
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7 |
DOOR CD |
9CD1810600 |
MIPS |
1 |
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8 |
WINDOW FLT |
9CD1615400 |
ACRYL |
1 |
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9 |
KNOB FUNCTION |
9CD1337900 |
ACRYL |
1 |
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10 |
KNOB CD |
9CD1338000 |
ABS |
1 |
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11 |
KNOB POWER |
9CD1338100 |
ABS |
1 |
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12 |
KNOB CONTROL |
9CD1338200 |
ABS |
1 |
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13 |
KNOB EQ L |
9CD13383L0 |
ABS |
1 |
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14 |
KNOB EQ R |
9CD13383R0 |
ABS |
1 |
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15 |
KNOB VOLUME |
9CD1334400 |
ABS |
1 |
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16 |
GUIDE FLT |
9CD2505600 |
ABS |
1 |
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17 |
PLATE FILTER |
9CD0910700 |
PC T0.3 |
1 |
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18 |
BRKT SIDE |
9CD2412900 |
ABS |
2 |
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19 |
DAMPER GEAR B |
9CD2603200 |
ACETAL |
2 |
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20 |
DAMPER BASE B |
9CD2603300 |
ACETAL |
2 |
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21 |
LOCKER BASE |
9CDOB01900 |
ACETAL |
2 |
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22 |
LOCKER CAM |
9CDOB02000 |
ACETAL |
2 |
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23 |
LOCKER SPRING |
9CDOB01600 |
STS |
2 |
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24 |
CASSETTE DECK LOGIC |
9CD6007000 |
ADR-2138MW |
1 |
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25 |
CUSHION FOOT |
9CD4207700 |
EVA |
2 |
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26 |
COVER BACK |
9CD0411100 |
MIPS |
1 |
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27 |
COVER TOP |
9CD0409600 |
MIPS |
1 |
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28 |
CHASSIS BOTTOM |
9CD0607100 |
SCP |
1 |
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29 |
HEAT SINK 50 |
9CD4404800 |
AL |
1 |
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30 |
HEAT SINK |
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AL |
1 |
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31 |
BRACKET HEAT SINK |
9CD2414400 |
ST 0.3 |
1 |
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32 |
COVER SIDE L |
9CD04112L0 |
MIPS |
1 |
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33 |
COVER SIDE R |
9CD04112R0 |
MIPS |
1 |
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34 |
BRAKETHEAT SINK |
9CD2414600 |
BSP 0.5T |
1 |
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35 |
HOLDER AC CORE |
9CD2303300 |
ABS |
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36 |
CD DECK MECHA |
9CD6007000 |
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1 |
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37 |
PLATE FLT |
9CD0909800 |
PVC SHEET T1.0 |
2 |
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38 |
PLATE FUNCTION |
9CD0910000 |
PVC SHEET T0.5 |
1 |
ONLY AMI-N822 ONLY AMI-N722
- 6 -
Exploded View and Mechanical Parts List
Model No: TX-350/550
NO |
PARTS NAME |
CODE NO |
DESCRIPTIONS |
Q'ty |
REMARKS |
P1 |
FRONT PCB |
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1 |
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P2 |
CD DECK PCB |
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1 |
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P3 |
MAIN PCB |
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1 |
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P4 |
POWER PCB |
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1 |
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S1 |
SCREW TAPTTITE |
7173261011 |
TT2 BIN 2.6 X 10 MFZN |
13 |
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S2 |
SCREW TAPTTITE |
7173301011 |
TT2 BIN 3.0X10 MFZN |
21 |
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S3 |
SCREW TAPTTITE |
7173301212 |
TT2 BIN 3.0X12 BK |
20 |
|
S4 |
SCREW TAPTTITE |
7173301612 |
TT2 BIN 3.0X 6 MFZN |
4 |
Ref : AMI-N822 |
S5 |
SCREW TAPTTITE |
7173400611 |
TT2 BIN 4.0X 6 MFZN |
4 |
|
S6 |
SCREW WASHER |
9CD3102400 |
3.0X10+D14 MFZN |
1 |
|
S7 |
SCREW WASHER |
9CD3102401 |
3.0X8+D14 |
4 |
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- 7 -
WIRING DIAGRAM
Model No:TX-350 / TX-550 |
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SN:9738832101 7P 250MM |
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SN:9738833900 10P 350MM |
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FUNCTION |
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TUNER |
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CW502 |
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CW601CW602 |
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CW501 |
CW503 |
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CW900 |
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CW600 |
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CN509 |
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CN400 |
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CN401 |
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CW507 |
P/T |
30W |
50W |
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CW400 |
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CN900 |
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CW508 |
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SN : 9738835000 3P 260MM |
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SN : 9738804300 7P 350MM |
9736407800 10P CONN PIN 9736407600 13P CONN PIN |
9738833700 8P 220MM |
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SN:9738840900 19P 110MM |
CN502 |
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CW704 |
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CW703 |
SN : SN : SN : |
FD701 |
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Pick-Up |
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IC702 |
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CW401 |
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CN508 |
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CW402 |
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PLAY |
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R/P HEAD |
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M |
HEAD |
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CN704 |
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CN701 |
CN703 |
M |
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SN : 9738834000 11P 150MM |
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SN : 9738834100 13P 100MM |
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CD MECHA. ASS'Y |
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- 8 - |
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BLOCK DIAGRAM
Model No:TX-350 /TX-550 |
- 9 - |
Schemetic Diagram
Model No:TX-350 / TX-550 |
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Ass'y Name: POWER/AMP/TUNER/TAPE |
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4 |
12 |
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11 |
7 |
8 |
10 |
9 |
15 |
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VSS2 |
VSS3 |
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8th switched |
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anti |
capacitor |
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TEST |
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filter |
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aliasimg |
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comparator |
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PLL 57KHz |
PLL |
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BIPHASE |
Differential |
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RDS/ARI |
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1187.5Hz |
DECODER |
DECODER |
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R/DATA |
QUAL |
R/CLK |
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V REF |
CLOCK |
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VSS1 |
ANALOG |
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VDD1 |
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2 |
1 |
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16 |
3 |
6 |
5 |
14 |
13 |
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ALC |
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AM/FM |
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IF |
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S-CURVE BUFF |
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19K |
19K 0 |
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304KHz |
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XOUT |
VSS |
PD1 |
VDD |
FMIN |
AMIN |
NC |
LW |
IFIN |
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XIN |
NC |
CE DA CK |
DO |
AM/FM |
ST/MO |
IF REQ |
FM |
SD |
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- 10 - |
Schemetic Diagram
Model No:TX-350 / TX-550
Ass'y Name: CD
- 11 - |
Schemetic Diagram
Model No:TX-350 /TX-550
Ass'y Name: CONTROL
- 12 - |
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