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INTRODUCTION
The ZVM-122
has
a 12-inch CRT
with
amber
phospher.
The
ZVM-123 is identical to
the
ZVM-122
except
it
uses a green
phosphor
CRT.
Both Monitors accept NTSC composite sync inputs,
display twenty-five 40
or
80-character lines,
and
have
an
18 MHz
bandwidth
with
a 50
ns
rise time.
Front
panel
controls
include
Brightness, Contrast,
Vertical Hold, Horizontal
Hold,
and
Vertical Height.
These Monitors
are
certified to
comply
with
the
limits for class B
computing
devices
pursuant
to sub-
part
J of
part
15 of
the
FCC rules.
Service of these monitors is to board level.
When
you have determined
that
a circuit board is
at
fault,
it
must be replaced. Return the defective board to
your Zenith Data Systems Distributor.
You will
need
the folowing tools
and
test
equipment
to service the ZVM-122
and
ZVM-123 monitor:
•
•
•
•
•
•
1/4"
nut
driver
1/4" flat screwdriver
Needle-nose pliers
Digital voltmeter
Oscilloscope
Software - ZDOS
with
VMENTEST
ZBASIC
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