Sony HCD-MJ1, Service Manual

Page: 21 / 68

– 21 –
E-F Balance Check
+
–
oscilloscope
(DC range)
TP (TEO)
BD (CD) board
TP (VC)
Procedure :
1. Connect TP ADJ (IC301
@•
pin) to ground with lead wire on Main
board.
2. Connect oscilloscope to test point TP (VC) and TP (TEO) on BD
(CD) board.
3. Turned Power switch on.
4. Put disc (YEDS-18) in and press the
^
button.
5. Confirm that the osilloscope waveform is symmetrical on the
top and bottom in relation to 0V, and check this level.
specified value :
r
A–B
2 (A+B)
X100 = less than
±
7%
r
A+B = 300
±
100mVp-p
level : 300
±
100mVp-p
A
B
0V
Traverse waveform
6. Remove the lead wire connected in step 1.
Focus/Tracking Gain Adjustment (RV102, RV103)
This gain has a margin, so even if it is slightly off. There is no prob-
lem.
Therefore, do not perform, this adjustment.
Please note that it should be fixed to mechanical center position when
you moved and do not know original position.
Adjustment Location
[BD (CD) BOARD] (Conductor side)
RF
FOK
IC102
IC101
IC104
RV101
RV103
RV102
TE1
FE1
FEO
TEO
VC
PCK
GND