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F-9

 

 

F-9

TROUBLESHOOTING & REPAIR

 

TROUBLESHOOTING GUIDE

 

Observe Safety Guidelines

 

detailed in the beginning of this manual.

 

 

 

PROBLEMS

POSSIBLE AREAS OF

RECOMMENDED

(SYMPTOMS)

MISADJUSTMENT(S)

COURSE OF ACTION

 

 

 

 

 

FUNCTION PROBLEMS

 

 

The SET speed is erratic or not

1. Check for loose or faulty con-

1. Remove power to the LN-9 and

adjustable over entire range of con-

nections on leads #631, #632,

disconnect the plug to the con-

trol. The actual speed is also errat-

and #633 between the speed

trol PC board. Check the resis-

ic like the SET speed.

control potentiometer (R2) and

tance of the speed control

 

the control PC board.

potentiometer (R2). When mea-

 

 

sured from the wiper (lead

 

 

#632) to lead #633, the resis-

 

 

tance should

vary smoothly

 

 

from 0 to 10,000 ohms, when

 

 

the shaft is rotated. See the

 

 

Wiring Diagram.

 

 

2. The control PC board may be

 

 

faulty. Replace.

 

 

 

The wire continues to feed with the

1. Disconnect the gun trigger cable.

1. Disconnect lead #530 from the

gun trigger open, and the wire is

If the problem is resolved, the

trigger board.

See the Wiring

electrically "hot." The interlock

gun trigger or cable is faulty.

Diagram. If

the problem is

switch is in the "OFF" position.

Repair or replace.

resolved, the trigger board is

 

 

faulty. Replace.

 

 

2. Relay 1CR may be stuck

 

 

closed. Check or replace.

 

 

3. The power PC board may be

 

 

faulty. Replace.

 

 

 

 

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 216-383-2531 or 1-800-833-9353.

LN-9 Wire Feeder

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Lincoln Electric SVM127-A service manual Troubleshooting & Repair