Casio CTK-485 Manual de usuario descargar pdf (Pagina 10)

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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.

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 19 20

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Casio CTK-485 Manual de usuario Pagina 10