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TROUBLESHOOTING & REPAIR
F-4 F-4
RANGER 8
Observe Safety Guidelines TROUBLESHOOTING GUIDE
detailed in the beginning of this manual.
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 (WELD).
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
OUTPUT PROBLEMS
Major Physical or Electrical
Damage is Evident.
1. Contact your local Lincoln
Authorized Field Service
Facility.
1. Contact The Lincoln Electric
Service Dept. 1-800-833-9353
(WELD).
No weld output and no auxiliary
power. Engine runs normally.
1. Check the brushes for wear and
proper contact to the rotor slip
rings.
1. Perform the Rotor Voltage Test.
2. Check for the presence of
12VDC (at the pc board) from
lead #216 to frame ground. This
is the “flashing” voltage and is
present only when the Start,
Run, Stop switch S3 is in the
“Start” position. If the 12 VDC is
missing check the leads,
switches and connections asso-
ciated with the lead #216. See
Wiring Diagram.
Check for the presence of 12
VDC (at the pc board) from lead
#224 to frame ground. This is
the supply voltage to the board
and is present when the engine
is running and the S3 switch is
in the “Run” position. If the
12VDC is missing check the
leads, switches and connec-
tions associated with the lead
#224. See Wiring Diagram.
3. If Rotor Voltage Test is normal,
then preform the Rotor
Resistance Test.
4. If the Rotor Voltage Test is NOT
normal, perform the Auxiliary
and Field Winding Voltage Test.
Then check the Field Diode
Bridge (D2) and the Field
Capacitor (C1). Replace if nec-
essary. If the Field Bridge and
Field Capacitor are good, then
the Printed Circuit Board may
be faulty. Replace.