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3-5. VCOM DC adjustment
1. Preparation
(1) AC adaptor or stabilizer.
(2) Photo sensor/ Photo sensor amp (C2719)/L.P.F
(3) Digital oscilloscope.
2. Adjustment and checking
(1) Turn the power on while pressing SHIFT and MENU keys simultaneously. (TEST MODE)
(2) Push SHIFT ➜ SHIFT ➜ MENU keys in order rapidly. (TEST MODE 1)
(3) Choose 50 PERCENT GRAY and execute it.
(4) Monitor the photo sensor amplifier output via a low-pass filter of cutoff frequency 60Hz.
Monitoring the oscilloscope screen, adjust VR321 to minimize 60Hz ripple waveform.
3. Notes
Perform these adjustments when you replace LCD module or PCB L.
Monoscope pattern
10-step gradation
10-step gradation
REC
OFF
PLAY
MENU
T
W
SET/ DISP
SHIFT
BEST SHOT
RESIZE
MF
PREVIEW
/
/
QV-3500EX
Photo diode
S1153
L.P.F
Photo Sensor Amp
C2719
Oscilloscope
LCD
Minimize the
ripple components
(Reference) Easy adjustment
(1) Shot a monoscope pattern with the camera and adjust VR321 so that the best 10-step gradation is
taken.
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