Casio QV-4000 Specifications download pdf (Page 27)

— 25 —

4-2. Contrast and Brightness voltage setting adjustment

1. Preparation

•AC adaptor or voltage regulator

•Digital oscilloscope

2. Adjustment procedure

(1) Start up Test mode Menu3.

1. Turn POWER on while pressing DISP key and MENU button simultaneously

2. Quickly press keys in the order of TIMER key, TIMER key and MENU key.

(2) Select / Execute GRAY SCALE (10 step).

(3) Trigger VG waveform (CP344) by FRP (CP346) signal to adjust as noted below.

(4) Adjust CONTRAST VR (VR344) so that contrast terminal voltage(CP341) signal is 1.50 ± 0.05 Vp-p.

(5) Adjust BRIGHT VR (VR341) so that potential between signal’s pedestal and 4 step is 2.16 ± 0.05 Vp-

(6) Adjust CONTRAST VR (VR344) so that potential between signal’s pedestal and 10 step is 2.00 ± 0.05

Vp-p.

(7) Remove the resistance set between the killer terminal (CP342) and the VCC5 (CP172).

3. Notes

• Consecutively, execute 5-5. TINT setting adjustment.

• Make sure that waveforms are not distorted.

4. Connection diagram

MAIN-PCB

VG(CP344)

Digital oscilloscope

Bright adjustment

Contrast adjustment

Killer terminal

(CP342)

QV-4000

VCC2

22KΩ

Power

Supply

Vcc1-1

(CP-102)

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 53 54

No comments

Casio QV-4000 Specifications Page 27