Installation; Zvm-131 And Zvm-135 Installation; Composite Signal; Rgb Signal - Zenith ZVM-131 Service Manual

Installation
ZVM-131 and ZVM-135 Installation
COMPOSITE SIGNAL
1. Connect applicable cables as shown in Figure 2.
NOTE: A weak composite signal may not produce suffi-
cient contrast and brightness. Connecting the composite
signal to the VIDEO OUT connector will provide higher
gain for more contrast and brightness.
2. Set the RGB/COMP switch to COMPo
3. Select green or color:
If the monitor is to be used for text display,
select green with the GREENIWHITE switch.
If the monitor is to be used for graphics display
or combined text and graphics display, select
color by switching the GREENIWHITE switch to
WHITE.
4. Perform the following adjustments for a color display
when using a composite signal from a signal source
such as a video cassette recorder.
a. Turn the COLOR LEVEL control all the way
counterclockwise to change the color display to
black-and-white.
b. Turn the DISPLAY DRIVE control to the mid-
range position.
c. Turn the BLACK LEVEL control to the midrange
(detent) position. This will cause the area of the
display intended to be black, to become black.
d. Adjust the COLOR LEVEL control to give the
desired amount of color to the display.
e. Adjust the TINT control for the most pleasing
colors.
f. Adjust the DISPLAY DRIVE control for the de-
sired brightness level.
g. If the dark areas, color areas, or both, appear
faded or washed out, turn the BLACK LEVEL
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control counterclockwise. If the light back-
grounds and colors appear too dark, turn the
BLACK LEVEL control clockwise.
h. Set the SHARPNESS control for the preferred
sharpness.
RGB SIGNAL
1. Connect applicable cables as shown in Figure 2.
2. Set the RGB/COMP switch to RGB.
3. Select green or color:
If the monitor is to be used for text display,
select green with the GREENIWHITE switch.
If the monitor is to be used for graphics display
or combined text and graphics display, select
color by switching the GREENIWHITE switch to
WHITE.
4. Perform the following adjustments for a color display
when using an RGB signal. You will need a color bar
chart which can be generated from the ROM in a Z-
100 or Z-100 PC Series Computer, or by using the
customer demonstration disk in a Z- 100 PC. (See
the Servicing section.)
a. Turn the DISPLAY DRIVE control to the mid-
range position.
b. Turn the BLACK LEVEL control to the midrange
(detent) pOSition. This will cause the areas of the
display intended to be black, to become black.
c. Adjust the DISPLAY DRIVE control to the de-
sired brightness level.
d. If the dark areas, color areas, or both, appear
faded or washed out, turn the BLACK LEVEL
control counterclockwise. If the light back-
grounds or colors appear too dark, tum the
BLACK LEVEL control clockwise.