Lincoln Electric POWER WAVE S500 Service Manual page 107

F-59
MULTI-PHASE CHOPPER BOARD TEST (continued)
FIGURE F.23 – MULTI-PHASE CHOPPER BOARD TEST POINTS
BL6
BL5
BL4
BL3
BL2
BL1
B2
9. Energize the output of the Power Wave
machine. Check to make sure the six LEDs on
the Multi-Phase Control board are lit. This is an
indication that the Multi-Phase Control board is
receiving gate firing signals from the Control
Board and the Multi-Phase board is providing
gate driving signals to the Multi-Phase Chopper
board. See Figure F.23.
10. Carefully perform the voltage tests per Table
F.20. See Figure F.23.
TROUBLESHOOTING AND REPAIR
S500
®
POWER WAVE
11. If the correct input voltage is being applied to
the Multi-Phase Chopper Board and the correct
output voltages are not being generated, the
Multi-Phase Chopper Board may be faulty.
12. If faulty, perform the Chopper Board Removal
and Replacement Procedure.
13. Perform the Case Cover Replacement
Procedure.
14. Perform the Retest After Repair Procedure.
® S500
F-59
6 LEDS
(GATE FIRING)
GREEN LED
B1