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CLD-1010
12.2 STBC ASSEMBLY
ADJUSTMENT
1. TBC Offset Adjustment
.
STBC Assembly Adjustment
®@ Objective: To set the offset voltage at Pin 1 of IC3 (BA4558DX) of the STBC assembly to OV
© Symptom if the adjustment is inadequate: After a search, the color lock is slow.
@Measuring equipment
| ¢ Oscilloscope
°¢ L.P.F.
and tools
@ Measurement
point
e STBC assembly
© IC3 (BA4558DX) Pin 1
® Test disc and set
e Stand by
@ Adjustment point
¢ STBC assembly VR1
Oscilloscope
5mV/div
0.5mS/div
DC voltage 0 V
DC mode
assembly
Connection diagram
Adjustment Procedure
. Press the Eject key on the Remote control once to stop
:
the rotation of the Spindle motor.
. With the player on stand by, connect the oscilloscope
}
to Pin 1 of IC3 (BA4558DX) and measure the offset
}
voltage.
. Adjust VR1 so that the offset voltage at Pin 1 of IC3
(BA4558DX) is 0 V.
Note: If the DC voltage can not be checked because of :
noise, connect the Low-pass filter (L.P.F.) as
}
shown in the diagram above.
94
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