Electrical Block Adjustments - Sony CDP-X5000 Service Manual

Note:
1. CD Block is basically designed to operate without adjustment.
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 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
SERVO board
TP (FE)
TP (VC)
Procedure :
1. Connect oscilloscope to test point TP (FE: CN210 !ºpin).
2. Connect between test point TP (FEI: IC101 @ªpin) and TP (VC:
CN210 !™pin) by lead wire.
3. Put disc (YEDS-18) in and turn Power switch on and actuate the
focus search.
4. Check the oscilloscope waveform (S-curve) is symmetrical be-
tween A and B. And confirm peak to peak level within 3±1 Vp-p.
S-curve waveform
5. 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 bright-
ness to obtain best waveform.
RF Level Check
SERVO board
TP (RF)
TP (VC)
Procedure :
1. Connect oscilloscope to test point TP (RF:CN215 1pin).
2. Turn Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Confirm that oscilloscope waveform is clear and check RF signal
level is correct or not.
SECTION 4

ELECTRICAL BLOCK ADJUSTMENTS

oscilloscope
symmetry
A
level: 3 ± 1 Vp-p
B
oscilloscope
— 10 —
Note: A clear RF signal waveform means that the shape "◊" can be
clearly distinguished at the center of the waveform.
RF signal waveform
E-F Balance Check
SERVO board
TP (TE)
TP (VC)
Procedure :
1. Connect test point TP (ADJ: CN515 3pin) to Ground and TP
(TEI: IC101 @¶pin) to TP (VC: CN210 !™pin) with a lead wire.
2. Connect oscillscope to test point TP (TE: CN210 !¡pin)
3. Turn Power switch on.
4. Put disc (YEDS-18) in and playback.
5. Confirm that the oscilloscope waveform is symmetrical on the
top and bottom in relation to 0Vdc, and check this level.
Traverse waveform
0Vdc
6. Remove the lead wire connected in step 1.
RF PLL Free-run Frequency Check
Procedure :
1. Connect frequency counter to test point TP (PLK: CN513 4pin)
with lead wire.
SERVO board
TP (PLK)
2. Turn Power switch on.
3. Put the disc (YEDS-18) in and playback.
Confirm that reading on frequency counter is 4.3218 MHz.
Setting of Focus/Tracking Auto Gain Data
Refer to "Writing of Focus/Tracking Auto gain data" on page 3.
VOLT/DIV : 200mV
TIME/DIV : 500ns
+0.25
level : 1.2 Vp-p
–0.20
oscilloscope
symmetry
level : 2 ± 1 Vp-p
frequency counter