Service Manual
- GCDR 105
Service Manual
- GCDR 105
R
GCDR 105
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INDEX
1.WARNING AND TECHNICAL SPECIFICATION 3
2.ALIGNMENT 4-5
3.BLOCK DIAGRAM 6-10
4.FUNCTION DIAGRAM 11
5.SPECIFICATION 12-13
6.VOLTAGE TABLE 14-15
7.TROUBLESHOOTING 16-17
8.DISASSEMBLY INSTRUCTION 18
9.EXPLOSION DIAGRAM AND BOM 19
10.WIRE ASSEMBLY DIAGRAM 20
11.PRINCIPLE DIAGRAM 21-22
12.REPAIR DIAGRAM 23
13.MATERIAL BILL OF APPLIANCE 24-26
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WARNING:
FOR CONTINUED SAFETY THE FOLLOWING PRECAUTIONS SHOULD BE FOLLOWED
DURING SERVICING.
1.MAKE SURE POWER CORD IS DISCONNECTED BEFORE REPLACING ANY PART.
2.REPLACE WITH TYPE, CRITICAL PARTS WITH! MAKE ON THIS DIAGRAM.
3.THE FOLLOWING TEST MUST BE IMPLEMENTED AFTER EACH REPAIR BEFORE
RETURNING IT TO CUSTOMER.USE AN OHM-METER TO MEASURE THE F.C.
RESISTANCE FROM BOTH A.C.CONDUCTORS TO ANY EXPOSED METALLIC PART
SUCH AS A SCREW HEAD.METAL INLAYS ETC. THE RESISTANCE MEASURED SHOULD
BE 10 MEGAOHMS MINIMUM.
TECHNICAL SPECIFICATION
Power output :0.8 Watts RMS per channel NOTE:
into 8 ohms In keeping with our policy of continually
improving our service and the technical
quality of our products we reserve the right
to change component type.manufactures
sources of supply of technical specification
are any time.
TUNER SECTION
FM Section :88MHz-108MHz
AM Section :522KHz-1620KHZ
CD PLAYER SECTION
Frequency Response :40Hz-10KHz
S/N Ratio :60dB
Channel Separation :40dB
3
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INSTRUMENTS REQUIRED: AM&FM Signal generator
IF Scope&2tracks Oscilloscope
AM IF ALIGNMENT
Set output of signal generator no higher than necessary to obtain an output reading.
Slide the function switch to the tuner position and the band switch to the AM position.
Set volume control to reference output.
Use loop antenna to Radiate the Signal into the Receiver Antenna..
RADIO SETTING ADJUSTMENT REMARKS
GENERATOR
465KHz Tune to 1640KHz Scope across T101 Adjust the
400Hz (high end). Speaker jack Wave for maximum
Modulation Or IC LA1824 &good Output
Pin(16.17)
AM RF ALIGNMENT
SIGNAL RADIO SETTING INDICATOR ADJUSTMENT REMARKS
GENERATOR
515KHz Tune to 530KHz SCOPE across L104 Adjust for maximum
400Hz (low end). Speaker jack or & good Output.
Modulation IC LA1824
1630KHz Tune to1600KHz pin(16.17) PVC101-TCO Adjust for maximum
400Hz (high end). &good output
Modulation
600KHz 600KHz VTVM&SCOPE AM BAR ANT Adjust for maximum
Across Speaker COIL 120:15 &good Output
1400KHz 1400KHz Jack PVC101-TCA Adjust for maximum
&good Output
FM RF ALIGNMENT
Connect Signal Generator across antenna terminals.
Adjustment of coils should not be attempted unless the Original coil is deformed or has been replaced.
Slide the function switch to the tuner position and the band switch to the FM position.
Set Volume control to reference output.
SIGNAL
GENERATOR RADIO SETTING INDICATOR ADJUSTMENT REMARKS
87.5MHz Tune to <88MHz L103 Adjust for maximum
1000Hz (low end ) SCOPE across &good Output
modulation Speaker jack or
108.3MHz Tune to <108MHz IC TA2111N PVC101-FMO Adjust for maximum
1000Hz (high end ). Pin(16.17) &good Output.
modulation
90MHz 90MHz VTVM&SCOPE L102 Adjust for maximum.
Across SPEAKER &good output
106MHz 106MHz Jack PVC101-FMA Adjust for maximum.
&Good Output
ALIGNMENT PROCEDURES
SIGNAL INDICATOR
4
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ALIGNMENT INSTRUCTIONS FOR CASSETTE TAPE DECK
Figure as diagram:
HEAD AZIMUTH: While playing test tape (6K3Hz)
Adjust azimuth screw on the left side
of the tape head for maximum output
for both L/R channel
INSTRUMENT REQUIRED:
A. AC VOLTMETER
B. FREQUENCY COUNTER
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UTC 2025
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