Roadstar GCDR 105 User manual

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
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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
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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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6
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UTC 2025
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SPECIFICATION
Power source : AC230 V 50Hz
Load impedance : 8 ohm
Reference output : 50 Mw
10% THD output : 0.8 W x2
Speaker : 8 ohm x2
Recording system : Magnet Erase
BAND:AM,1KHz 30% MOD
Characteristic Unit
Frequency Low KHz
Range High KHz
lntermediate Frequency KHz
Useable 600kHz uV/M
Sensitivity 1000kHz uV/M
(S/N 20dB) 1400kHz uV/M
Selectivity±10kHz 1000kHz DB
BAND:FM,1KHz 75KHz DEV.
Characteristic Unit Limit
Frequency Low MHz 88
Range High MHz
lntermediate Frequency MHz 10.7+/-0.15
Useable 90MHz uV 10
Sensitivity 98MHz uV 10
(S/N 30dB) 106MHz uV 10
S/N at 1mV lnput 98MHz db 40
Limit
108
1000
1000
20
1020
522
465
1000
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CD
TEST DISC :SONY TYPE 4
FUNCTION :PLAY/PAUSE.STOP SKIP(<<&>>),REPEAT PLAY
DISPLAY :LCD MULTI DISPLAY
DIGITAL SIGNAL PROCESSING
OPTIC PICK-UP :BEAM LASER
ERROR CORRECTION :CROSS INTERLEA VED REED-SOLOMON CODE
DIGITAL FILTER :18-BIT LINEAR
SAMPLING RATE :2 TIMES
ltem Unit Limit
Frequency Response 100Hz/16KHz dB ±3
S/N Ratio dB 50
lnterruption information layer um
Block dot um
Eccentric disc um 70
Channel separation(W/Band Past Filter) 40
700
700
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MAIN UNIT VOLTAGE CHARTS
IC & TRANSISTORS VOLTAGE CHARTS
0.02 2.49 3.83 66
0.01654.98 2.48 2.13
00.02 2.5 2.17 4.2 64 5
4.13 04.2 630 2.48 2.18
4.945 2.48 8.28 4.2 62 4.4
1.65 2.214.2 610.01 2.48 8.28
0.940.42 2.5 2.17 4.2 60 1.33
0 0.990.5 590.42 2.5 0
2.480.01 2.48 3.81 1.3 58 0
1.77 2.480.7 572.48 2.44 3.83
54.98 0 1.1 3.4 56 0
4.31 03.5 554.98 2.47 1.12
2.480.05 2.49 7.74 1.1 54 0
0.68 2.481.1 530.01 2.51 0
0.012.48 2.5 11 3.81 3.4 52 0.01
0.01 0.012.7 510 2.49 6.8 3.28
2.532.36 2.48 9.5 2.17 0 50 0.01
0.01 2.360492.51 2.48 0.59 2.17
2.520 2.49 0 0 4.2 48 0
0.5 1.573.7 470.07 2.49 0 5.1
05 2.48 10.5 5.1 4.2 46 0.01
0.01 2.480.1 451.56 2.47 0 7.57
0.010 2.5 0.59 2.17 4 44 0.01
4.98 0.050.5 430 2.5 9.5 2.17
4.970 2.46 6.7 3.78 0 42 2.81
2.82 4.980.8 41
LA9242
LC78602R LA9242 TC2025 KA9258 LA1824 PIN LC78602R
IC401 IC801 IC101 IC U803 IC802
39
40
U803 IC802
0.01 2.46 10.5 3.83
35
36
37
38
31
32
33
34
27
28
29
30
23
24
25
26
19
20
21
22
15
16
17
18
11
12
13
14
7
8
9
10
IC
PIN
1
2
3
4
5
6
0.02 2.48 3.82 67
4.98 2.48 0 68
2.51 2.24 69
0.72 2.24 70
4.94 1.55 71
4.94 0 72
0.74 4.98 73
0.66 0.09 74
0.74 0.01 75
0.74 0.42 76
0.74 0.42 77
780.39 0.01
00 79
0 2.48 80
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TRANSISTORS
Q802 5 0 5 1317
Q808 0.8 5 5 1346
Q807 4 0.8 5 1346
Q805 3.8 1.8 3.8 A733
Q804 3.8 1.8 3.8 A733
Q816 4 5 3.5 C2001
Q801 7.8 5 8.2 B764
Q441 9 13 8.2 D882
Q806 1 0 0 C945
Q803 1 0 0 C945
Q401 1 5 1 C945
Q402 1 5 1 C945
Q431 11 13 10 C2001
型号BCE
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Circuit Symptom Cause and Remedy
General No sound 1.Speakers are not connected.
Check the speaker connection
2.Wrong function is selected.
Set switch to the proper position.
3.Defective volume control.
Set the volume control to a proper sound level
. 4.Defective earphone jack.
Replace the earphone jack.
5.The inserted battery is upside down.
Please notice the polarity of battery.
AM No sound ,weak 1.Improper location of unit.
sound. Rotate or reposition the unit.
(Low sensitivity) 2.Defect in L104
Check resistance voltage and current .Replace as needed.
3.Defect AM antenna coil or oscillator coil.
Replace if necessary.
4.Intermediate Frequency tuning faulty.
Readjust (See"Alignment and adjustment")
5.RF Tracking faulty.
Readjust (See"Alignment and adjustment")
6.Defective IC 101(LA1824).
7.Poor contact in antenna circuit.
Check resistanc
e
FM No sound ,weak 1.Fm antenna is not connected.
sound.Low sensitivity Connect the built-in or external antenna.
2.Defective band selector switch.
Replace or repair the switch .
3.Defective IC 101(LA1824).
Check voltages.Replace if necessary.
4.Intermediate Frequency tuning faulty.
Readjust(See"Alignment and adjustment")
Poor contacted or repair as required.
TROUBLE SHOOTING
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Circuit Symptom Cause and Remedy
CD Cannot read the the 1.The inserted disc is upside down.
table of contents. Insert disc correctly.
No display. 2.Disc is dirty.
No sound. Wipe it with a piece of soft colth.
3.Disc is seriously hed.
Use a new disc.
4.Disc is seriously warped.
Use a new disc.
5.A non -standard disc has been inserted.
Use only a brand name disc .
6.Moisture has formed inside the CD desk.
Wait about 20 to 30 minutes.
7.Defect in the servo control board.
Replace or repair as required.
8.Defect in the CD pickup mechanism.
Replace as required.
TROUBLE SHOOTING
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DISASSEMBLY INSTRUCTION
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