Casio QV-770 Service Manual page 11

(1) Transaction
1. 10-step black Displays black and white
and white display bar gradated in 11 steps
2. Color bar display Provides color bar signal to
the LCD and TV monitor
(displays 75 % white level
VIDEO signal)
3. Cross hatch dis- Provides cross hatch sig-
play nal to LCD and TV monitor
(displays white line mesh
on black display)
Provides brightness 50 %
4. 50 percent white
gray signal to LCD and TV
raster display
monitor. Used for VCOM
DC adjustment on PCB-L.
Provides brightness 50 %
5. Gray raster dis-
gray signal to LCD and TV
play
monitor
(2) Display
Displays 10-step black and white bar on the
LCD and TV monitor
Displays color bar on the LCD and TV monitor
Displays cross hatch on LCD and TV monitor
Displays brightness 50% gray color on LCD
and TV monitor.
Displays brightness 50% gray color on LCD
and TV monitor.
(3) Check
Utilized for brightness volt-
When checking with an os-
age and contrast adjust- cilloscope, terminate it with
ment on PCB-L. 75 ohm resistance. Returns
to Test mode display by [+]
or [–] buttons.
Make sure that white level When checking with an os-
75% color bar is outputted cilloscope, terminate it with
from VIDEO OUT terminal. 75 ohm resistance. Returns
to Test mode display by [+]
or [–] buttons.
When checking with an os-
cilloscope, terminate it with
75 ohm resistance. Returns
to Test mode display by [+]
or [–] buttons.
When checking with an os-
Refer to page 18 for VCOM
cilloscope, terminate it with
DC adjustment on PCB-L.
75 ohm resistance. Returns
to Test mode display by [+]
or [–] buttons.
When checking with an os-
cilloscope, terminate it with
75 ohm resistance. Returns
to Test mode display by [+]
or [–] buttons.
(4) Supplement