Cd Section; Tel 13942296513 - Sony HCD-GX8000 Service Manual

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CD SECTION

Note:
1. CD Block is basically designed to operate without adjustment. Therefore,
check each item in order given.
2. Use LUV-P01 (4-999-032-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10MΩ impedance.
4. Clean the object lens by an applicator with neutral detergent when the
signal level is low than specified value with the following checks.
S-CURVE CHECK
BD board
TP(FEO)
TP(DVC)
Procedure :
1. Connect an oscilloscope to TP (FEO).
2. Connect between TP (FEI) and TP (DVC) ( 1.65 V) by lead
wire.
3. Turn the power ON.
4. Load a disc (LUV-P01) and actuate the focus search. (In
consequence of open and close the disc tray, actuate the focus
search)
5. Confirm that the oscilloscope waveform (S-curve) is
symmetrical between A and B. And confirm peak to peak level
within 2 ± 0.5 Vp-p.
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S-curve waveform
L 13942296513
6. After check, remove the lead wire connected in step 2.
Note: • Try to measure several times to make sure than the ratio
of A : B or B : A is more than 10 : 7.
• Take sweep time as long as possible and light up the
brightness to obtain best waveform.
RF LEVEL CHECK
BD board
TP(RFDC)
TP(RFAC)
TP(DVC)
Procedure :
1. Connect an oscilloscope CH1 to TP (RFDC) and CH2 to TP
(RFAC).
2. Turn the power ON.
3. Load a disc (LUV-P01) and playback.
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4. Confirm that oscilloscope waveform is clear and check if RF
signal level is correct or not.
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Oscilloscope
symmetry
A
within 2 ± 0.5Vp-p
B
oscilloscope
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Note: Clear RF signal waveform means that the shape " ◊ " can be clearly
distinguished at the center of the waveform.
RF signal waveform
E-F BALANCE (1 TRACK JUMP) ADJUSTMENT
BD board
TP(TEO)
TP(DVC)
Procedure :
1. Connect an oscilloscope to TP (TEO) and TP (DVC).
2. Turn the power ON.
3. Load a disc (LUV-P01) and playback the number nine track.
4. Press the hH button. (Becomes the 1 track jump mode.)
5. Confirm that the level B and A (DC voltage) on the oscilloscope
waveform.
1 track jump waveform
Q Q
3 6 7 1 3 1 5
DVC
6. Adjust RV101 on the BD board so that the center of waveform
becomes the same voltage of DVC. (i.e. A=0V)
Connecting and Adjustment Location: BD board
co
.
HCD-GX8000/RG77
9 4 2 8
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 0.65 ± 0.15Vp-p (RFDC)
1.1 ± 0.4Vp-p (RFAC)
oscilloscope
0 5 8 2 9 9 4 2 8
B
level=1.0 ± 0.5Vp-p
symmetry
m
9 9
center of
9 9
waveform
A (DC voltage)
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