Safety Precautions - Daewoo 529B Service Manual

SAFETY PRECAUTIONS

CAUTION: No modifications of any circuits should be attempted. Service work should only be performed
after you are thoroughly familiar with all of the following safety checks and servicing
guidelines.
Safety Check
Care should be taken while servicing this analog color display because of the high voltages used in the deflection circuits.
These voltages are exposed in such areas as the associated flyback and yoke circuits.
Fire & Shock Hazard
• Insert an isolation transformer between the analog color display and AC power line before servicing the
chassis.
• In servicing, pay attention to the original lead dress, especially in the high voltage circuit; if a short circuit
occurs, replace all parts which have been overheated as a result of the short circuit.
• All the protective devices must be reinstalled per original design.
• Soldering should be inspected for any possible cold solder points, frayed leads, damaged insulation, solder
splashes or sharp solder points. Be certain to remove all foreign materials.
Implosion Protection
Picture tubes in this monitor employ an intergral implosion protection system, but care should be taken to
avoid damaging and scratching during installation.
Only use the same type of replacement picture tubes.
IMPORTANT SAFETY NOTICE: There are special components used in an analog color display, which
X-Ray
WARNING: The only potential source of X-Ray is the picture tube. However, when the high voltage
circuitry is operating properly, there is no possibility of an X-Radiation problem. The basic
precaution that must be exercised is to keep the high voltage at the following factory
recommended level.
NOTE: It is important to use an accurate, periodically-calibrated high voltage meter.
• To measure the high voltage, use a high-impedance high-voltage meter.
Connect(-) to chassis and (+) to the CRT anode button.
• Turn the Contrast & Brightness control fully counterclockwise.
• Measure the high voltage. The high voltage meter should indicate the following factory
recommended levels.
• If the upper meter indication exceeds the maximum level, immediate service is required to
prevent the possibility of premature component failure.
• To prevent the possibility of X-Radiation, it is essential to use the specified picture tube.
• The normal high voltage is 25.5KV or below and must not exceed 29KV level at zero beam
current rated voltage.
are important for safety. These parts are shaded on the schematic
diagram and on the replacement parts list. It is essential that these
critical parts be replaced with manufacturer's specified parts to prevent
X-ray, shock, fire, or other hazards. Do not modify the original design
without getting a written permission from DAEWOO
ELECTRONICS CO. or this will void the original parts and labor
warranty.
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