Adjustment - Casio CTK-411 Service Manual

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.