Lincoln Electric SVM143-A Operator's Manual page 54

F-10
Observe all Safety Guidelines detailed throughout this manual.
PROBLEMS
(SYMPTOMS)
The DH-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.
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 216-383-2531 or 1-800-833-9353.
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TROUBLESHOOTING AND REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
FUNCTION PROBLEMS (Continued)
1. Make sure the DH-10 is con-
nected properly to the power
source.
2. Make sure 42 VAC is being
applied to the DH-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 DH-10 is con-
nected properly to the power
source.
2. Make sure 42 VAC is being
applied to the DH-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 .
CAUTION
RECOMMENDED
COURSE OF ACTION
1. The input rectifier bridge may
2. The control board may be
1. Check leads #512 (1J3) to #500
2. If the 12.8 VDC is present the
1. The control board may be
1. The control board may be
DH-10
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.
faulty.
(3J3) for the presence of
12.8 VDC. If the 12.8 VDC is
not present the control board
may be faulty.
display board may be faulty.
defective.
faulty.
F-10