TROUBLESHOOTING GUIDE
E-1
POWER DOES NOT TURN ON
NO
IS F3801 BROKEN ?
YES
CHANGE F3801.
NO
YES
CHECK IC3801 AND
PERIPHERAL CIRCUIT.
NO
CHECK Q3809 AND
PERIPHERAL CIRCUIT.
OR CHANGE POWER PCB.
NO
YES
CHECK IC3807 AND
PERIPHERAL CIRCUIT.
OR CHANGE POWER PCB.
YES
CHANGE SCALER PCB.
IS THERE VOLTAGE
AT EMITTER OF Q3809
AT3.3V ?
IS THERE VOLTAGE
AT PIN 2 OF IC3807
AT5V ?
IS THERE VOLTAGE
AT PIN 4 OF IC3801
20.5V ?