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TROUBLESHOOTING ACCORDING TO CAUSE AND SYMPTOM
1. POWER SUPPLY UNIT
2. VERTICAL, HORIZONTAL UNIT
3. SERVO/SYSCON UNIT
4. VIDEO UNIT
5. AUDIO UNIT
– Before Troubleshooting, Read the following.
• Picture will not appear, if the following problems exist.:
1) When power supply is dead.
2) When horizontal output TR is dead
3) When operation of overcurrent protection circuit.
4) When +125V is not supplied to FBT.
• Suggestions when servicing the power supply unit.
1) Before changing components, unplug the power cord. Then discharge both terminals of C806, through a high
wattage resistor measuring in the k ohm region.
2) When servicing this unit, it is recommended that an isolation transformer be used. This will protect personnel and
test equipment from a potential shock hazard.
3) Whenever the fuse blows, measure the resistance of the cement type power resistors.
4) Check solder connections on components mounted on heat sinks and other parts after completing services.
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