Lincoln Electric 11937 Service Manual page 32

F-18
PROCEDURE
1. Remove the input power to the machine.
2. Perform the Case Cover Removal Procedure.
3. Start with the voltage control switch on tap A.
4. Turn machine on and close trigger switch.
WARNING
ELECTRIC SHOCK can kill.
• Have an electrician install and
service this equipment. Turn the
input power OFF at the fuse box
before working on equipment. Do
not touch electrically hot parts.
Turn the machine OFF between each test.
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TROUBLESHOOTING AND REPAIR
MAIN TRANSFORMER TEST (continued)
FIGURE F.4 – VOLTAGE CONTROL SWITCH
TAP
A
B
C
D
E
WIRE FEEDER WELDER (180 MODEL)
VOLTS AC
17
19
22
26
46
SECONDARY TEST PROCEDURE
NOTE: Secondary voltages will vary proportion-
ately with primary input voltage. For this
test, place voltage control potentiometer
to maximum.
5. Check voltage at the rectifier. See Figure F.4.
F-18