Adjustment - Casio CTK-573 Service Manual

DISPLAY PCB
1) Items to be adjusted:
Item
Vop voltage setting
2) Adjustment and Test Point Locations
TP2 (LSI401 Pin30)
TP1 (LSI401 Pin33)
3) Equipment connection/Procedure
Input Input
Connection Point
Eye
36.1°
LCD

ADJUSTMENT

Voltmeter
(TOP VIEW)
Vop voltage setting
Set
Output
TP1
TP2
Input Output
Adjust
Signal Connection
VR401 Voltmeter
Watching the LCD at a 36.1° angle to the horizontal, adjust Vop
voltage so that unenergized segments are seen dimly.
— 10 —
Measuring Instrument
Voltmeter
Output
Point
TP1-TP2 Adjust for 4.3 ~ 4.4 V reading
on voltmeter under the tem-
perature 20 ~ 25 °C.
Make fine adjustment accord-
ing to the next instruction.
Adjust for