Adjustment - Casio CTK-485 Service Manual

MAIN PCB
1) Items to be adjusted:
Item
Vop voltage setting
2) Adjustment and Test Point Locations
(Top View)
3) Equipment connection/Procedure
Input Input
Point
Connection
Eye
41.20°
LCD

ADJUSTMENT

Voltmeter
Vop voltage setting
Set
Output
TP2
Input Output
Adjust
Signal Connection
VR1
Watching the LCD at a 41.20° angle to the horizontal, adjust Vop
voltage so that unenergized segments are seen dimly.
— 9 —
Measuring Instrument
(Bottom View)
VR1
Voltmeter
Output
Point
Adjust for 4.2 ~ 4.3 V reading
Voltmeter TP2
on voltmeter under the tem-
perature 20 ~ 25 °C.
Make fine adjustment accord-
ing to the following instruc-
tion.
TP2
Adjust for