Characteristics; Description; Controls, Indicators, And Connectors; And Zvm-135 - Zenith ZVM-131 Service Manual

Description
Color video monitors ZVM-131, ZVM-133, ZVM-135, and
ZVM-136 are very similar. They are the same size, have
the same appearance (see Figure 1), and use much of the
same circuitry. Their main circuit boards and most other
boards are similar. A monochrome display can be selected
with a switch on all models.
r~
- - - __ - "
r
5 -
~-
I
Figure 1
Monitor Front View
The ZVM-131 and ZVM-135 color monitors, together with
their export versions, the ZVM-131-E and ZVM-135-E, can
accept both RGB and composite inputs from different
sources and have full audio capability. The ZVM-131 and
ZVM-135 are the same except that the ZVM-131 has a
medium-resolution display and the ZVM-135 has a high-
resolution display.
The high-resolution ZVM-133 and ZVM-136 color monitors,
together with their export versions, the ZVM-133-E and
ZVM-136-E, have no audio capability and their inputs are
limited to those computers with an RGB output. The ZVM-
133 and ZVM-136 are the same except that the ZVM-136
has a high persistance phosphor CRT.
Characteristics
Controls, Indicators, and Connectors
Refer to Figures 2, 5, 6, and 7 for locations of controls, in-
dicators, and connectors.
ZVM-131 AND ZVM-135
Front Panel
Power switch
Power indicator
Volume
Display drive
Black level
Color level
Tint
Sharpness
Rear Panel
GREEN-WHITE switch
RGB/COMP switch
Focus
RGB input connector
Video input connector
Video output connector
Audio input connector
Audio output connector
Internal
Horizontal centering
Width
Horizontal oscillator
Vertical centering
Height
G1
G2
RGB cutoff (main board)
BLUE and RED cutoff (audio/video sync board)
RGB drive
+95 volts
Width selection
Chroma null phase
Black level cutoff
Black level reference
Page 5