Casio QV-2900UX Specifications download pdf (Page 16)

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4-4. VCOM DC adjustment

1. General

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

2. Preparation

(1) AC adaptor or stabilizer.

(2) Photo sensor (S1153)/ Photo sensor amp (C2719)

(3) Digital oscilloscope or AC meter.

(3) B. P. F

NTSC: Center frequency; approx. 60 ± 5 Hz

PAL: Center frequency; approx. 50 ± 5 Hz

3. Adjustment and checking

(1) Boot MENU 1 on the test mode.

1. Turn the camera on while pushing SHIFT and MENU keys.

2. Push SHIFT keys twice then MENU keys rapidly.

(2) Select and execute 50 PERCENT GRAY.

(3) Monitor the Photo Sensor Amp output via a bypass filter with an AC meter and adjust VR321 so that the

meter needle swing is minimum.

Instead of an AC meter, you can use an oscilloscope. In that case, adjust VR321 for minimum ripple

component.

4. Block diagram

CARD

POWER

ON/OFF

PLAY

REC

SHIFT

INFO

RESIZE

B.P.F

Photo Sensor Amp

C2719

AC meter

Minimize the swing

of AC meter needle.

QV-2900UX

LCD

Photo diode

S1153

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Casio QV-2900UX Specifications Page 16