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F-10
TROUBLESHOOTING AND REPAIR
F-10
LN-10
Observe all Safety Guidelines detailed throughout this manual.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
Neither encoder control knob
functions.
The LN-10 is dead. The displays
and LEDs on the keypad are off.
The green and red LEDs on the
control board are not lit.
The displays and LEDs on the key-
pad are off. The green and red
LEDs on the control board are both
blinking normally at about one sec-
ond intervals.
The displays and LEDs on the key-
pad are off. The green and/or red
LEDs on the control board are
blinking at a very fast or erratic
rate.
The wire feed is consistent and
adjustable, but operates at the
wrong speed.
1. Check the wiring and plug con-
nections between the encoder
boards and the control board.
(Plug J2) See the Wiring
Diagram.
1. Make sure the LN-10 is con-
nected properly to the power
source.
2. Make sure 42 VAC is being
applied to the LN-10 at the input
receptacle terminals A and B.
1. Check the wires and connectors
(J11 and J3) between the dis-
play board and the control
board for loose or faulty connec-
tions.
1. Make sure the LN-10 is con-
nected properly to the power
source.
2. Make sure 42 VAC is being
applied to the LN-10 at the input
receptacle terminals A and B.
1. Make certain the DIP switch S1
is correctly set for the wire drive
and gear ratio. See Wire Drive
Head Selection.
1. Perform the Encoder Board
Test.
2. The control board may be
faulty.
1. The input rectifier bridge may
be faulty. Check for 42 VAC at
the red leads. Also check for at
least 42 VDC at leads #542(+)
to #500(-). See the Wiring
Diagram.
2. The control board may be
faulty.
1. Check leads #512 (1J3) to #500
(3J3) for the presence of
12.8 VDC. If the 12.8 VDC is
not present the control board
may be faulty.
2. If the 12.8 VDC is present the
display board may be faulty.
1. The control board may be
defective.
1. The control board may be
faulty.
FUNCTION PROBLEMS (Continued)
CAUTION
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.
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