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F-4

 

 

 

 

 

F-4

TROUBLESHOOTING & REPAIR

 

 

 

Observe Safety Guidelines

 

 

TROUBLESHOOTING GUIDE

detailed in the beginning of this manual.

 

 

 

 

 

 

 

 

 

 

 

PROBLEMS

POSSIBLE AREAS OF

RECOMMENDED

 

 

(SYMPTOMS)

MISADJUSTMENT(S)

COURSE OF ACTION

 

 

 

 

 

 

 

 

OUTPUT PROBLEMS

 

 

 

 

 

Major physical or electrical damage

1. Contact your local Lincoln

1.

Contact the

Lincoln Electric

is evident.

Authorized

Field Service

 

Service Department at 1-800-

 

Facility.

 

 

833-9353 (WELD)

 

 

 

 

 

 

 

The Multi-Weld 350 is completely

1. Make sure the power source is

1.

Measure the input voltage to the

dead. The meters do not light and

working properly and supplying

 

Multi-Weld 350.

It must be

the input contactor does not acti-

at least 50VDC to the Multi-

 

between 50 and 113VDC.

vate when the ON/OFF Mode

Weld 350.

The electrode cable

2.

The ON/OFF

Mode Selector

Selector switch is turned on.

must be positive polarity and the

 

switch (S1)

may

be faulty.

 

work cable negative polarity.

 

 

 

Check and replace if faulty. See

 

 

 

 

 

2. Check the electrode and work

 

the Wiring Diagram. Also check

 

cables for loose or faulty con-

 

associated wiring.

 

 

 

nections.

 

3.

The input diode D1/D2 may be

 

 

 

 

 

 

 

open. Check. See the Wiring

 

 

 

 

Diagram.

 

 

 

 

 

 

4.

Perform the DC Buss Supply

 

 

 

 

Board Test.

 

 

 

 

 

 

5.

Perform the

Analog Control

 

 

 

 

Power Supply Board Test.

 

 

 

6.

The Weld Control 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, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-800-833-9353.

MULTI-WELD 350

Page 44
Image 44
Lincoln Electric SVM151-A service manual Troubleshooting Guide, Perform the DC Buss Supply, Board Test, Analog Control