Lincoln Electric IM604 RANGER 8 LPG - Manual (Page 26)

19 TROUBLESHOOTING 19
RANGER 8 LPG
TROUBLE
A. No welder or output power.
B. Engine will not idle down to
low speed.
C. Engine will not go to high idle
when attempting to weld.
CAUSE
1. Open in miscellaneous leads.
2. Open lead in flashing or field
circuit.
3. Faulty rotor.
4. Faulty Potentiometer (R1).
5. Faulty stator Field winding.
6. Faulty Field rectifier (D2).
7. Faulty P.C. Board.
1. Idler switch on High Idle.
2. Insufficient voltage present
between terminals #213 and
#5E. (Voltage should be 12V
DC).
3. External load on welder or
auxiliary power.
4. Faulty wiring in solenoid circuit.
5. Faulty idler solenoid.
6. Faulty P.C. Board.
1. Poor work lead connection to
work.
2. No voltage signal from the
current sensor.
3. No open circuit voltage on
output studs.
4. Faulty P.C. Board.
WHAT TO DO
1. Refer to wiring diagram &
check related leads.
2. Refer to wiring diagram and
check all related leads (200,
224, 200A, 200B, 201, 201A).
3. Lift brushes and check rotor
resistance between slip rings.
It should be approximately
4 ohms.
4. Replace with known good one.
5. Disconnect lead #9 at D2 and
check for continuity between
leads #9 and #7.
6. Replace with known good one.
7. Replace with known good one.
1. Set switch on Automatic Idler.
2. Check for proper connection of
leads (#213, #5E, #215, #209,
#209A, #224, #224A).
3. Remove all external loads and
short circuits.
4. Check for broken leads #213
and #215.
5. Replace with known good one.
6. Replace P.C. Board with
known good one.
1. Make certain work clamp is
tightly connected to clean base
metal.
2. Check for disconnected or
broken leads in idler sensing
circuit.
3. Check generator output.
4. Replace P.C. Board with
known good one.