Lincoln Electric IDEALARC CV-300 Service Manual page 52

F-13
MAIN TRANSFORMER TEST (CONTINUED)
11. Locate lead #42A (lead #33 on
machine codes below 9900) con-
nected to circuit breaker CB1 and
pin "I" on the 14 pin amphenol con-
nector on the Case Front.
Figure F.2.
FRONT PANEL
FIGURE F.2 - Main Transformer Test
Points.
12. Test for 42 VAC between lead #42A
at the circuit breaker (lead #33 on
machine codes below 9900) and pin
"I" on the on the amphenol connec-
tor.
a. If voltage is missing, check for
loose or broken wires between
the test points and the main
transformer.
gram.
TROUBLESHOOTING & REPAIR
13. Locate the following heavy leads
See
14 PIN AMPHENOL
CONNECTOR (PIN I)
CIRCUIT BREAKER
CB1 (LEAD #42A)
FIGURE F.3 - Location of leads #221,
#222, and #223.
14. Test for 36 VAC.
See wiring dia-
15. If the correct three-phase input volt-
IDEALARC CV-300
b. If voltage is present, continue
test.
connected to output rectifier bridge:
#221, #222, and #223. See Figure
F.3.
LEAD #221
LEAD #222
LEAD #223
MAIN TRANSFORMER
FROM LEAD TO LEAD
#221 #222
#223 #221
#222 #223
age is being applied to the main
transformer and some or all of the
secondary voltages are incorrect or
missing, the transformer may be
faulty. Replace.
F-13