RF signal waveform
CD SECTION
VOLT/DIV: 200 mV
Notes:
TIME/DIV: 500 ns
1. CD block basically constructed to operate without adjustment. There-(with the 10: 1 probe
fore, check each item in order given.in use)
2. Use YEDS-18 disc (Part No.: 3-702-101-01) unless otherwise indicated.
3. Use the oscilloscope with more than 10 MW impedance.+0.25
level: 1.3 Vp-p�0.20
4. Clean an object lens by an applicator with neutral detergent when the
signal level is low than specified value with the following checks.
S-Curve Check
Connection:
When observing the eye pattern, set the oscilloscope for AC range
oscilloscope
and raise vertical sensitivity.
BD board
TP (FE)+When a general remote commander is not used (1 Track Jump
TP (VC)�Check):
Procedure:
1. Connect the oscilloscope to TP (TE) and TP (VC) on BD board.
Procedure:
2. Turned power switch on.
1. Connect the oscilloscope to TP (FE) and TP (VC) on BD board.
3. Put disc (YEDS-18) in and press the � button, and play the
2. Connect between test point TP (FOK) and GND by lead wire.
number five track.
3. Turned power switch on.
4. Press the � button. (Becomes the 1 track jump mode)
4. Put disc (YEDS-18) in and turned power switch on again and
5. Confirm that the level B of the oscilloscope's waveform and
actuate the focus search. (actuate the focus search when disc
the A (DC voltage) of the center of the traverse waveform.
table is moving in and out.)
Confirm the following:
5. Confirm that the oscilloscope waveform (S-curve) is symmetri-
cal between A and B. And confirm peak to peak level withinA � B
´ 100 = ? 7 (%)
3.0 ? 1.0 Vp-p.2 (A + B)
S-curve waveform1 track jump waveform
symmetryCenter of the waveform
B
A
within 3.0 ? 1.0 Vp-p
A (DC voltage)
B0V
symmetry
6. After check, remove the lead wire connected in step 2.
Note:Y Try to measure several times to make sure that the ratio of A : Blevel: 1.3 ? 0.6 Vp-p
or B : A is more than 10 : 7.
Y Take sweep time as long as possible and light up the brightness
to obtain best waveform.Connection Location:
[BD Board] (Side A)
RF Level Check
Connection:CN102
oscilloscope
(AC range)
BD board
TP (RF)+
TP (VC)�IC101
CN101
TPIC103
(FOK)
Procedure:
TP
1. Connect the oscilloscope to TP (RF) and TP (VC) on BD board.
(TE)
2. Turned power switch on.TP (RF)
3. Put disc (YEDS-18) in and press the � button.TP (VC)
4. Confirm that the oscilloscope waveform is clear and check RFTP
signal level is correct or not.(FE)
Note:Clear RF signal waveform means that the shape OA� can be clearly
distinguished at the center of the waveform.
� 17 � |
ACEC
SONY
