Chapter 4: Servicing; Safety Guidelines - Zenith ZVM-1380 Service Manual

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.