Lincoln Electric IDEALARC DC-1500 Service Manual page 41

F-7
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
Machine has minimum output
and no control.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely,
contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed.
Call 1-888-935-3877.
TROUBLESHOOTING AND REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
1. If remote control is being
used, put output control
switch (SW4) in "OUTPUT
CONTROL AT
position and control weld
output with the output control
(R1) at DC-1500. If the prob-
lem is solved, check the
remote control unit (or wire
feeder) and associated con-
trol cable.
1. If a remote control unit is NOT
connected to the terminal strip
#73, #74,#75, #76, and/or #77
terminals, the output control
switch must be in the "OUT-
PUT CONTROL AT DC-1500"
position.
2. If a remote control cable is
connected to terminals #73,
#74, #75, #76, and/or #77, the
leads may be shorted to the
positive weld output.
3. Make certain the three phase
input voltage is correct and
matches the machine rating
and the reconnect panel.
CAUTION
IDEALARC® DC-1500
RECOMMENDED
COURSE OF ACTION
1. Check output control switch
(SW4)
wiring.
DC-1500"
2. Check feedback leads #222
(negative output terminal)
and #234, #232 (output
shunt) for loose or faulty con-
nections.
gram.
3. Check the #75 lead for conti-
nuity (zero ohms) from the
output control potentiometer
(R1) to the control board plug
12 pin 7. See wiring dia-
gram.
4. Perform Firing Board Test.
5. Perform
Test.
6. Perform SCR Output Bridge
Test.
1. Check the output control
potentiometer
associated wiring.
2. Check the output control
switch (SW4) the welding
mode switch (SW5) and
associated wiring.
3. Perform the Control Board
Test.
4. Perform the Firing Board
Test.
5. Perform the SCR Output
Bridge Test..
6. Perform Main Transformer
Test.
F-7
and associated
See wiring dia-
Control Board
(R1) and