Tovis MTG-2902SN/SE, Service And Operation Manual

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SAFETY PRECAUTIONS AND WARNINGS
Service Warning
This display contains HIGH VOLTAGE capable
of delivering LETHAL quantities of energy.
Service should only be attempted by trained
personnel familiar with the potential dangers
inherent with voltage equipment.
Safety Related Component Warning
Certain components used in TOVIS color
monitors are critical for safe operation of the
display. These parts Number are marked by
( ) in the parts list and on the schematic
diagram it is essential that these Safety critical
components be replaced only with exactly
specified components to prevent the
Possibility of excessive X-radiation emission,
electrical shock, fire, or premature
component failure.
Modifying the original design without written
approval from TOVIS is expressly forbidden, will
void the original Parts and labor warranty, and
may result in creating a hazardous situation.
X-RADIATION WARNING
COMPONENTS WHICH MAY AFFECT POTENTIAL
EXCESS EMISSION OF X-RADIATION IN THE
HORIZONTAL DEFLECTION AND HIGH VOLTAGE
CIRCUITS (INCLUDING THE PICTURE TUBE) ARE
TO BE USE ONLY TYPE AND RATING OF
REPLACEMENT COMPONENT AS SHOWN IN THE
PARTS LIST.
1. The only potential source of X-radiation
emission is the picture tube. When the high
voltage and horizontal deflection circuits are
operating correctly there is no possibility of
excess X- radiation emission. NEVER attempt
to modify these circuits.
2. Periodically check the high voltage with a
reliably calibrated meter for values not in
excess of Manufacturer’s recommendations.
See high voltage Shut-down Circuit, page 4,
for further details.
CRT Warning
All picture tubes used in TOVIS monitors are
equipped with an integral implosion protection
system.
The picture Tube is, however, a highly evacuated
component whose outside surfaces are subject to
strong external forces. Care must be exercised so
as not to bump or scratch the tube during
installation or servicing as this may cause the tube
to implode resulting in possible personal injury and
property damage. Shatter-proof goggles must be
worn by Individuals while handling the CRT or
installing the display in the cabinet. Do not handle
The CRT by the neck.
1. Always ensure the high voltage at the anode cap
is fully discharged prior to handling or service.
2. Replace picture tube only with same type and
number.
Product Safety and Service Guidelines
1. Service should be performed only after reading all
of the warnings and precautions in this manual
and as Labeled on the CRT and chassis.
2. Where a short circuit has occurred, replace all
components that indicate evidence of
overheating or poor Connection on all plastic
connectors.
3. Inspect wiring for frayed leads and damaged
insulation when service is required, observe original
lead Dress is followed as from the factory,
especially in the high voltage circuitry area.
4. All protective devices must be reinstalled per
original design.