Vcom Dc Adjustment - Casio QV-4000 Service Manual And Parts List

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3-5. VCOM DC adjustment

1. General

Perform these adjustments when you replace LCD module or MAIN-PCB.

2. Preparation

(1) AC adaptor or stabilizer.

(2) Photo sensor / Photo sensor amp (C2719)

(3) Digital oscilloscope.

3. Adjustment and checking

(1) Turn the power on while pressing DISP and MENU keys simultaneously. (TEST MODE)

(2) Push FLASH

(3) Select VCOM ADJUST and press the shutter release button about half way.

VCOM DC ADJ

(4) Monitoring the Photo Sensor Amp output via B.P.F., move the control button up or down so that the

ripple component is minimum.

Photo diode

S1153

LCD

QV-4000

FLASH

MENU keys in order rapidly. (TEST MODE 2)

0X00000840

Photo Sensor Amp

C2719

B.P.F

— 21 —

AC meter

Minimize the

ripple components

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