Lincoln Electric LN-25 Service Manual page 65

F-27
CONTACTOR & CONTACTOR PC BOARD TEST (continued)
CODES 9812 AND BELOW
J6
J7
4. Apply 12 VDC to the contactor coil leads.
CAUTION
Do not leave the 12 VDC applied to the contactor
coil for a prolonged period of time (15 seconds
maximum). Damage to contactor may result.
5. If the contactor does not activate when the 12
VDC is applied, the contactor is faulty. Replace.
6. If the contactor activates when the 12 VDC is
applied, check the resistance between the two
large ter minal studs with the contactor
activated. The resistance should be very low (0
to 1 ohm).
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TROUBLESHOOTING AND REPAIR
FIGURE F.14 – CONTACTOR PC BOARDS
S20963
S20963
CONTACTOR
COIL LEADS
CODES BELOW 10500
J6
#667
#621
7.If the resistance is "high" or "open" between the two
large terminal studs when the contactor is
activated, the contactor is faulty. Replace.
8. If the contactor activates and the resistance
between the terminals is low when the 12 VDC
is applied, the contactor is good.
NOTE: When the contactor is not activated, the
resistance between the terminals should be very high
(infinite). If the resistance is always low, the contacts
are "stuck" and the contactor is faulty. Replace.
LN-25™
J7
J9
CONTACTOR
COIL LEADS
F-27