Casio VM-5000 Operation, Service Manual & Parts List page 7

4. VCOM DC coarse adjustment
IF signal
Signal
generator
VCC1-1
Stabilizer
• Conditions
(1) Apply 11.50 ± 0.05 [V] on Vcc1-1.
(2) Signals: provide color bar pattern (white 75 %) composite video signal from CP196.
Signal level; 1Vp-p ± 0.01V (75 ohm termination), conforming to NTSC-M system.
(3) Connect 47kohm resistor between CP304 and CP300 (GND).
• Adjustment
(1) Adjust VR310 so that the amplitude of VCOM output (CP710) is 10.0 ± 0.5 [V].
(2) Adjust VR703 so that High level of VCOM output (CP710) is 6.5 ± 0.5 [V].
5. LCM screen positioning
IF signal
Signal
generator
VCC1-1
Stabilizer
• Conditions
(1) Apply 11.50 ± 0.05 [V] on Vcc1-1.
(2 Signals: Apply monoscope pattern composite video signal from CP196.
Signal level; 1Vp-p +/-0.01V (75 ohm terminated), conform to NTSC-M system.
• Adjustment
(1) Connect LCM to display monoscope pattern.
(2) Adjust LCD's H.POS to display the picture in the center.
Adjust so that the right and left patterns are the same.
• Caution
(1) Non-equality of right and left pattern should be less than 1 mm.
(2) Adjustment should be done with the display unit which is assembly of LCM and PCB.
M-PCB
B output
CP710
M-PCB
Signal
Backligjt
Right and left pattern balance
should be equal.
— 5 —
GND
Oscilloscope
LCM
The difference between the
right and left pattern should be
less than 1mm.