Lincoln Electric SVM133-B service manual Range Switch

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F-14

TROUBLESHOOTING & REPAIR

F-14

TROUBLESHOOTING GUIDE

Observe Safety Guidelines

detailed in the beginning of this manual.

PROBLEMS

POSSIBLE AREAS OF

RECOMMENDED

(SYMPTOMS)

MISADJUSTMENT(S)

COURSE OF ACTION

WELDING PROBLEMS

The welding arc is “hot”, “spattery”,

1. Check to make sure that the

1. Perform

the

Range

Switch

“cannonballs” or “flares up”. The

machine settings

match the

Test.

engine runs normally. The auxil-

weld application.

2.

Perform

the

Fine

Control

iary power is normal.

2.

If the remote control unit is not

Potentiometer Test.

connected

to

the machine,

3. Check for poor connections at

make

sure

the

Local/Remote

the J1 molex plug at the control

switch

(S1)

is

in

the “Local”

board. Also, perform the Shunt

position.

Calibration Test.

3.

If a remote control unit is con-

4.

Check for poor connections at

nected, and the machine oper-

J4 pins 1, 2, 3, 6, & 7 at the con-

ates normally when the switch

trol board.

Also,

perform the

is in the “Local” position, the

Exciter

Voltage

Feedback

remote control cable or unit

Test.

may

be faulty.

Check or

5.

Check

for

poor

connections

replace.

along lead #207 at the negative

CC output stud, and at J6 pin

10 molex plug at the control

board. This is CC arc voltage

feedback input. Will not effect

welding in the CV tap.

6. Check

for

poor

connections

along lead #204A at the diode

bridge and at J6 pin 4 molex

plug at the control board. This

is control board common.

7. Check

for

poor

connection

along lead #208 at the negative

CV output stud and at J21 pin 6

molex plug at the CV daughter

board. This is CV voltage feed-

back input. Will not affect weld-

ing in the general fab or pipe

taps.

8. Check for

poor connection at

J21 pins 1 & 4 at the CV daugh-

ter board. This is CVSCR gate

drive output. Will not affect

welding in the general fab or

pipe taps.

9. Check the weld & CV chokes (if

so equipped) for turn to turn

shorts.

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).

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