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Adjustment - Casio CTK-431 Service Manual

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MAIN PCB
1) Items to be adjusted:
Item
Vop voltage setting
2) Adjustment and Test Point Locations
(TOP VIEW)
TP1
3) Equipment connection/Procedure
Input
Input
Connection
Point
Eye
36.6°
LCD

ADJUSTMENT

Voltmeter
Vop voltage setting
Set
Output
TP1
Input
Output
Adjust
Signal
Connection
VR1
Watching the LCD at a 36.6° angle to the horizontal, adjust Vop
voltage so that unenergized segments are seen dimly.
— 7 —
Measuring Instrument
(BOTTOM VIEW)
Voltmeter
Output
Point
Voltmeter
TP1
VR1
Adjust for
Adjust for 4.1 ~ 4.0 V reading
on voltmeter under the
temparature 20 ~ 25 °C.
Make fine adjustment ac-
cording to the following in-
struction.

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