Adjustment - Casio CTK-401 Service Manual

MAIN PCB
1) Items to be adjusted:
Item
Vop voltage setting
2) Adjustment and Test Point Locations
3) Equipment connection/Procedure
Input Input
Connection Point
Eye
53.5°
LCD

ADJUSTMENT

Voltmeter
(TOP VIEW)
Vop voltage setting
Set
Output
V5
Input Output
Adjust
Signal Connection
VR1
Watching the LCD at a 53.5° angle to the horizontal, adjust Vop
voltage so that unenergized segments are seen dimly.
— 7 —
Measuring Instrument
Voltmeter
Output
Point
Voltmeter V5
Test point
Adjust for
Adjust for 4.3 ±0.1 V reading
on voltmeter.
Make fine adjustment accord-
ing to the next instruction.