Casio CTK-620L, Service Manual

Page: 13 / 33

— 12 —
3) Equipment connection/Procedure
Vop voltage setting
Output
Set Voltmeter
TP3
37.6
°
LCD
Eye
Watching the LCD at a 37.6
°
angle to the horizontal, adjust Vop
voltage so that unenergized segments are seen dimly.
ADJUSTMENT
DISPLAY PCB
1) Items to be adjusted:
m e t I t n e m u r t s n I g n i r u s a e M
g n i t t e s e g a t l o v p o V r e t e m t l o V
2) Adjustment and Test Point Locations
(TOP VIEW)
VR401
TP3
Input
Connection Input
Point Input
Signal
Adjust
Output
Connection Output
Point
Adjust for
VR401 Voltmeter TP3 Adjust for 4.2 ~ 4.3 V reading
on voltmeter under the tem-
perature 20 ~ 25
°
C.
Make fine adjustment accord-
ing to the next instruction.