Lincoln Electric SVM154-A Service Manual page 54

Ln-10 heads & controls boom mount or bench models
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F-9
Observe all Safety Guidelines detailed throughout this manual.
PROBLEMS
(SYMPTOMS)
The "Timer" or "Control" button
does not function correctly.
Pressing the trigger key has no
effect while not welding.
One of the encoder control knobs
functions but the other one does
not.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln Electric
Service Department for technical troubleshooting assistance before you proceed. Call 1-800-833-9353.
-----------------------------------------------------------------------------------------------------------------------------
TROUBLESHOOTING AND REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
FUNCTION PROBLEMS (Continued)
1. Make certain the DIP switches
on the control board are not set
for the security mode. DIP
switch S2 position 3 must be in
the OFF position. See Security
Mode Selection.
2. Check the connectors and wires
between the display board and
the control board for loose or
faulty connections. (J11 and J3)
3. Check the connector J10
between the keypad and the
display
board
connections.
1. Make certain the DIP switches on
the control board are not set for
the security mode. DIP switch S2
position 3 must be in the OFF
position. See Security Mode
Selection.
2. Check the connectors and wires
between the display board and
the control board for loose or
faulty connections. (J11 and J3)
3. Check
the
between the Keypad and the dis-
play board for loose connections.
1. The unit maybe in a mode that
utilizes only one display. To
check if this is the problem,
make sure that both knobs
change the display when both
displays are showing a number.
2. Check the wiring and plug con-
nections between the encoder
boards and the control board.
(Plug J2) See the Wiring
Diagram.
CAUTION
RECOMMENDED
COURSE OF ACTION
1. Perform the Keypad Resis-
2. The display board may be
3. The control board may be
for
loose
1. Perform the Keypad Resis-
2. The display board may be
3. The control board may be
connector
J10
1. Perform the Encoder Board
2. The control board may be
LN-10
tance Test.
faulty.
faulty.
tance Test.
faulty.
faulty.
Test.
faulty.
F-9

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