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E-4
TROUBLESHOOTING
CLASSIC 300D
E-4
ELECTRONIC IDLER TROUBLESHOOTING GUIDE
With Idler Control Switch in the AUTO Position,
Engine Will Not Pick Up Speed When:
The Arc is Struck
Reed Switch in Weld Circuit
Defective -- Will Not Close
To Check: Short the Red Lead
on P.C. Board to Welder Frame.
The Auxiliary Power Load is Turned ON
Power Load Too Small
Try Load Above 150 Watts
Engine Does Not Pick Up Speed
1. Check Continuity of Idler Solenoid Coil
(8.5-9.0 ohms) and Replace as
Required.
2. Check for Jamming of the Idler
Solenoid Mechanism.
3. Check for Continuity of Current
Transformer (Toroid). Replace as
Required.
4. Check Idler Circuit Wiring and Repair
as Required.
5. Replace Idler P.C. Board.
Engine Picks Up Speed
1. Check for Break in
Red Lead and Repair
2. Replace Reed Switch
in Weld Circuit.
Engine Does Not Pick Up
Speed
1. Check Continuity of Idler
Solenoid Coil (8.5-9.0
ohms) and Replace as
Required.
2. Check for Jamming of
the Idler Solenoid
Mechanism.
3. Check Idler Circuit
Wiring and Repair as
Required.
4. Replace Idler P.C.
Board.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
CAUTION