168
SECTION 5
TROUBLESHOOTING
Figure 5.1 IGBT Gating Signal
5.3 REFERENCE VOLTAGE CHECKS
A. Control Board Assembly (PCB1)
1.
LED’s
LED- (D9)-
Torch Switch
LED- (D4)-
Pilot Arc Relay
LED- (D1)-
Gas Solenoid Valve
2.
Voltage Test Points
Tests are made with power on - no arc.
Disable High Frequency by disconnecting blue wire with black
sleeve
TP-1 - Torch trigger signal
TP-4 - IGBT’s driving signal - switching frequency = 18.5 KHz
TP-5 - IGBT’s driving signal - switching frequency = 18.5 KHz
TP-7 - +5 vdc
TP-8 - +15 vdc
TP-9 - -15 vdc
TP-10 - Ground
54
µ
s
13vdc
13vdc
0
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