Lincoln Electric NA-5N Service Manual page 86

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Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
The flux or gas/water solenoid does
not function (open).
The flux or gas/water solenoid con-
tinuously remains open.
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.
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENTS(S)
FUNCTION PROBLEMS
1. Make sure the switch on the flux
hopper is in the ON position.
2. Check light 7G located on the
logic board. This light should be
on when the flux valve would nor-
mally be active. If light 7G does
not light the logic board may be
faulty.
1. Check light 7G located on the
logic board. This light should be
lit only when the flux valve would
normally be active. If light 7G is
lit continuously the logic board
may be faulty.
2. Check to make sure the solenoid
is not stuck in the open position.
CAUTION
NA-5
RECOMMENDED
COURSE OF ACTION
1. If light 7G, located on the logic
board, does light when the flux
(gas/water) solenoid is normally
active, check the CR1 relay.
Normal coil resistance is 10,000
ohms. The contacts (terminals 2
and 4) should "close" when
110VDC is applied to the relay coil
(terminals 1 + and 3 -).
2. Check the wiring harness for
loose or faulty connections
between the CR1 relay, the logic
board, the TS2 terminal strip and
the flux receptacle. See wiring
diagram.
1. Check the CR1 relay. The con-
tacts (terminal 2 and 4) should
"close" only when 110VDC is
applied to the relay coil. (termi-
nals 1+ and 3-). If the contacts
are "closed" continuously replace
the CR1 relay.
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