Casio CTK-620L - 3-Step Lesson; Step 1 - Master the Timing; Step 2 - Master the Melody; Step 3 - Play a Normal Speed

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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:
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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.