Casio CTK-411, Service Manual

Page: 9 / 19

— 7 —
Item Measuring Instrument
Vop voltage setting Voltmeter
3) Equipment connection/Procedure
Vop voltage setting
Input
Connection Input
Point Input
Signal
Adjust
Output
Connection Output
Point
Adjust for
VR1 Voltmeter TP1
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.
Watching the LCD at a 36.6
°
angle to the horizontal, adjust Vop
voltage so that unenergized segments are seen dimly.
ADJUSTMENT
MAIN PCB
1) Items to be adjusted:
2) Adjustment and Test Point Locations
(TOP VIEW)
Output
Set Voltmeter
TP1
36.6
°
LCD
Eye
(BOTTOM VIEW)
TP1
VR1