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TROUBLESHOOTING & REPAIR
F-18 F-18
RANGER 300 D AND 300 DLX
OBSERVE SAFETY GUIDELINES TROUBLESHOOTING GUIDE
DETAILED IN THE BEGINNING OF THIS MANUAL.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
FUNCTION PROBLEMS
With the engine running, the output
contactor does not pull in when
using a wire feeder with a control
cable connected to the RANGER
300 DLX amphenol.
1. Make sure the Welding
Terminals switch (S8) is in the
“Welding Terminals Remotely
Controlled” position.
2. If the output contactor activates
(closes) when switch S8 is in
the “Welding Terminals Always
On” position, the contactor and
control PC board are function-
ing.
3. Install a jumper wire from pins
“D” to “C” on the 14-pin am-
phenol. If the output contactor
activates, the problem is exter-
nal to the RANGER 300 DLX.
The wire feeder or control cable
may be faulty.
1. With Welding Terminals switch
(S8) in the “Welding Terminals
Always On” position, check for
12VDC from leads #224(+) to
#232(-) at the output contactor.
If 12VDC is present and the
contactor does NOT activate,
the contactor may be defective.
See the Wiring Diagram.
2. If the correct voltage is NOT
present in Step #1, check from
lead #224 to ground (lead #5)
for the presence of 12VDC. If
12VDC IS present, check the
continuity of lead #232 to 9J2
on the control board. See the
Wiring Diagram.
3. If 12VDC is NOT present from
lead #224 to ground (lead #5),
check the continuity of lead
#224 to 1J1 on the control
board. See the Wiring Diagram.
4. The control board may be
faulty.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con-
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
1-800-833-9353.