Lincoln Electric POWER WAVE C300 Service Manual page 50

TROUBLESHOOTING AND REPAIR
F-31 F-31
SWITCH BOARD TEST PROCEDURE (continued)
TABLE F.6 – SWITCH BOARD RESISTANCE MEASUREMENTS (continued)
Full Bridge Low Sid e B37( +) To High Resistance Machine "o ff" no
IGB Ts B49( -) Greate r than input power applied.
Also 10,000 ohms The Pla nar
B41( +) T o Typical failure is a Transformer
B49( -) "short electrically isolated
fro m the switch bo ard
at test points B37 and
B41
POWER WAVE® C300