The
following service procedures provide information
on
how to adjust, align and troubleshoot the monitor.
These procedures are intended to be used with the
schematics, component views, and waveforms found
at
the
end of this chapter. Review the following safety
guidelines before beginning service and perform the
final
checks at the end of this chapter after repairing
the
unit.
Safety Guidelines
WARNING: No work should
be
attempted
on
any part
of
the
chassis by anyone not familiar with Zenith ser-
vice
procedures and precautions; otherwise personal
injury may result.
WARNING: With monitor power turned off and discon-
nected, discharge the high voltage anode lead at the
CRT
using a jumper lead connected between the chas-
sis
and
screwdriver as illustrated in Figure
6-1
.
WARNING: Operation of the CRT at voltages higher
than
28
KV
may produce X-rays. Always verify that
the
voltage is at normal levels when servicing the mon-
itor.
Do
not operate the monitor with excessive high
voltage any longer than necessary to locate the cause
of
the
excessive voltage.
Chapter 4
Servicing
WARNING: Carefully handle the CRT when holding,
removing, or installing it; otherwise, implosion and/or
personal injury may result.
CAUTION: Many integrated circuits are electrostatic-
sensitive and can be damaged by static electricity if
they are handled improperly. Once an
IC
or board
is
removed from its protective foam packing, envelope,
or
computer do not lay the IC or board down or let
go
of it until it is installed in the unit. When bending
the
leads of
an
IC,
hold the
IC
in one hand and place
the
other hand
on
the work surface before touching
the
IC
to the work surface. This will equalize the static
electricity between the work surface, you, and the
IC.
WARNING: Under no circumstances should the origi-
nal
design
be
modified or altered without permission
from
Zenith Electronics Corporation. All components
should
be
replaced only with types identical to those
in
the
original circuit, and their physical location, wiring,
and
lead dress must conform to the original layout
upon
completion of repairs.
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