E-F Balance Check
oscilloscope
(DC range)
BD board
TP (TEO)+
TP (VC)�
Procedure :
1. Ground main board IC701 (pin #?) with the lead wire.
2. Connect oscilloscope to test point TP (VC) and TP (TEO) on BD
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.
Traverse waveform
A
0V
B
level : 300 ? 100mVp-p
A�B
specified value : r X100 = less than ? 7%
2 (A+B)
r A+B = 300 ? 100mVp-p
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 BOARD] (Conductor side)
FOKIC102PCK
FEI
TEI
GND
RV102
RFIC101
FEO
VC
RV101IC104TEO
RV103
� 13 � |