Read Sony CDP-C591 / CDP-CE235 / CDP-CE335 / SEN-R2900 Service Manual online
— 9 —
— 10 —
RF PLL Free-run Frequency Check
Procedure :
1.
1.
Connect frequency counter to TP (PLCK) with lead wire.
2.
Turned Power switch on.
3.
Put the disc (YEDS-18) in to play the number five track.
Confirm that reading on frequency counter is 4.3218MHz.
Confirm that reading on frequency counter is 4.3218MHz.
Adjustment Location :
[ BD BOARD ] — Conductor Side —
BD board
TP (PLCK)
frequency counter
TP(VC)
TP(RF)
TP(TE)
TP(TE1)
CN102
TP(FE)
TP(PLCK)
TP(GND)
TP(FE1)
TP(AGCCON)
IC101
20
21
40
41
60
61
80
1
Note :
Clear RF signal waveform means that the shape “
◊
” can be clearly
distinguished at the center of the waveform.
E-F Balance (1 Track jump) Check
Procedure :
1.
1.
Connect oscilloscope to TP (TE) and TP (VC).
2.
Turned Power switch on.
3.
Load a disc (YEDS-18) and playback the number five track.
4.
Press the
( button. (Becomes the 1 track jump mode.)
5.
Confirm that the level B and A (DC voltage) on the oscilloscope
waveform.
waveform.
Note :
1.
CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
Therefore, check each item in order given.
2.
Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3.
Use an oscilloscope with more than 10M
Ω
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.
when the signal level is low than specified value with the
following checks.
S-Curve Check
Procedure :
1.
1.
Connect oscilloscope to TP (FE).
2.
Connect between TP (FE1) and TP (VC) by lead wire.
3.
Connect between TP (AGCCON) and TP (GND) by lead wire.
4.
Turn Power switch on.
5.
Load a disc (YEDS-18) and actuate the focus search. (In
consequence of open and close the disc tray, actuate the focus
search)
consequence of open and close the disc tray, actuate the focus
search)
6.
Confirm that the oscilloscope waveform (S-curve) is
symmetrical between A and B. And confirm peak to peak level
within 4 ±1 Vp-p.
symmetrical between A and B. And confirm peak to peak level
within 4 ±1 Vp-p.
7.
After check, remove the lead wire connected in step 2 and 3.
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
Procedure :
1.
1.
Connect oscilloscope to TP (RF).
2.
Connect between TP (AGCCON) and TP (GND) by lead wire.
3.
Turned Power switch on.
4.
Load a disc (YEDS-18) and playback.
5.
Confirm that oscilloscope waveform is clear and check RF
signal level is correct or not.
signal level is correct or not.
6.
After check, remove the lead wire connected in step 2.
SECTION 4
ELECTRICAL BLOCK CHECKING
BD board
Oscilloscope
TP(FE)
TP(VC)
TP(VC)
symmetry
S-curve waveform
within 4
±
1Vp-p
A
B
TP(RF)
TP(VC)
TP(VC)
BD board
oscilloscope
RF signal waveform
VOLT/DIV : 200mV
TIME/DIV : 500ns
TIME/DIV : 500ns
level : 1.45
±
0.3Vp-p
TP(TE)
TP(VC)
TP(VC)
BD board
oscilloscope
level=1.3
±
0.6Vp-p
symmetry
A (DC voltage)
center of
waveform
waveform
B
0V
1 track jump waveform
Specified level: ––
×
100=less than
±
22%
B
A
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