Casio CTK-485, Руководство по обслуживанию

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3) Equipment connection/Procedure
ADJUSTMENT
MAIN PCB
1) Items to be adjusted:
2) Adjustment and Test Point Locations
Item Measuring Instrument
Vop voltage setting Voltmeter
TP2
(Top View) (Bottom View)
VR1
Vop voltage setting
Watching the LCD at a 41.20
°
angle to the horizontal, adjust Vop
voltage so that unenergized segments are seen dimly.
Output
Set Voltmeter
TP2
41.20
°
LCD
Eye
Input
Connection Input
Point Input
Signal
Adjust
Output
Connection Output
Point
Adjust for
VR1 Voltmeter TP2 Adjust for 4.2 ~ 4.3 V reading
on voltmeter under the tem-
perature 20 ~ 25
°
C.
Make fine adjustment accord-
ing to the following instruc-
tion.