Casio CTK-431 User Manual download pdf (Page 9)

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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)

(BOTTOM VIEW)

TP1

VR1

36.6°

LCD

Eye

Output

Set Voltmeter

TP1

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 18 19

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Casio CTK-431 User Manual Page 9