TROUBLE SHOOTING GUIDE
1. TROUBLE SHOOTING FLOW CHART
A. POWER CIRCUIT
When changing the parts which are out of order, first, remove the power plug from the socket and then discharge the
voltage across between both terminals of C803. (Use an external approximately 20 resistance)
When check the primary circuit by using the oscilloscopes insulate the oscilloscope properly (Use the insulating trans-
former)and GND must be connected GND into the primary GND (But there is no connection when checking the seca-
ondary circuit.
When changing M801, check FUSE and ceramic resistor properly.
A-1. CHECKING THE PRIMARY CIRCUIT.
No output voltage
YES
Is the voltage applied to NOCheck F801, L801, L802
CN11?C803, D801, R801
YES YES
Is the voltage +15V at pin3NOIs the voltage above 10VNOIs the voltage 0V at pin3
of IC11?at pin3 of IC11?of IC11?
YES YES YES
Check the secaondary NONO Check R14, R15, T11
( A )
circuitR13, D11, L12
A-2. CHECKING THE SECONDARDARY CIRCUIT.(Before secondary circuit open).
(A)
YES
NOCheck transformer of no
Check each output voltage
output stages
YES
NOCheck the diode of no
output stages
YES
Check the CN11
YES
Check the coil, condensor
of no output stages
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ACEC
DAEWOO
