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Connect the pretest power supply to plug P70 as
per Figure F.78. See wiring diagram.
ARC START PW450 WITH WIREFEEDER
The arc start may be initiated by any of the follow-
ing methods:
1. Release wire tension and pull gun trigger.
2. Jumper pins C and D on wire feeder input con-
nector.
3. Jumper pins D and E on front panel amphenol
connector near welding output terminals.
TROUBLESHOOTING & REPAIR
F-202 F-202
POWER WAVE 450
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2
P70
3
5
6
5A
FUSE
PRETEST POWER
SWITCH
2
P70
3
5
6
ISOLATED
115 VAC
FIGURE F.78 - PRETEST POWER SUPPLY
PRE-POWERUP SWITCH BOARD TEST PROCEDURE
FOR REPLACEMENT OF SWITCH ASSEMBLY G2402-2 (continued)