TOVIS P/N
MTG-1902EX
DATE
2002.03.11
REV.NO
0
TOVIS
Color Monitor Service Manual
PAGE
3/25
1. SAFETY PRECAUTION
WARNING: Service should not be attempted by anyone unfamiliar with the
necessary precautions set forth in this manual. Please adhere to
these service precautions.
1-1. Some parts in this unit, such as the picture tube, have special safety-related
characteristics for X-RAY RADIATION protection. For continued safety, parts
replacement should be undertaken by referring to articles (1-2
∼
1-5).
1-2. Many electrical/mechanical parts in this unit have special safety-related
characteristics for protection against electrical shock and other potential
hazards. These characteristics often go unnoticed by a visual inspection and
the protection afforded by them cannot necessarily be obtained by using
replacement components rated for higher voltage, wattage, etc. Replacement
parts, which have these special characteristics, are identified in the manual
and highlighted on the schematic diagram and parts list. Before replacing
these components read the parts list carefully.
1-3.
When replacing chassis in the cabinet, always be certain that all the
protective devices are installed properly, such as insulating covers, strain relief,
etc.
1-4. Before replacing the back cover of the set, thoroughly inspect inside the
cabinet to see that no stray parts or tools have been left inside.
1-5 Before returning the set to the customer always perform an ac current leakage
check on the exposed metallic parts of the cabinet, such as terminal, screw
heads, metal overlays, control shafts, etc. To be sure the set is safe to operate
without danger of electrical shock, plug the AC power cable directly into a 115V
AC outlet. (do not use a line isolation transformer during this check). Use an
AC volt- meter with 5000 or more ohms per volt in the following manner. You
cannot use a 1500 ohm, 10watt resistor, paralleled by a 0.15(uF) capacitor.
Reverse the AC plug, the AC outlet and repeat the AC voltage measurements
for each exposed metallic part. Voltage measured must not exceed 0.3V RMS.
This corresponds to 0.2mA AC. Any value exceeding this limit constitutes a
potential shock hazard and must be corrected immediately.
TOVIS CO., LTD.