Snap-on Tools Corporation Kenosha, WI 53141-1410 15
TROUBLE SHOOTING (SYMBOL*)
FOR TECH. SERVICE, CALL TOLL-FREE 1-800-232-9353
The Trouble Shooting Chart is a guide in identifying and correcting
possible troubles which may occur when operating this equipment.
FAULT POSSIBLE CAUSE REMEDY
(SYMBOL*) - USE THIS IDENTIFIER, ALONG WITH THE SCHEMATIC DIAGRAM FOUND IN THE SERVICE
MANUAL, FOR TROUBLE-SHOOTING PURPOSES.
EQUIPMENT MALFUNCTION
No main power, MM140SL switch is "OFF".
(CB1)
Turn switch "on".
fan does not Wall breaker is "tripped". Reset wall breaker.
operate, "Open" circuit breaker Reset or replace
"on" indicator on MM140SL.
(CB1)
breaker.
light is off. Loose or broken connection Tighten or repair
in power input circuit. connection.
Main power on, MIG torch unplugged. Plug in MIG torch.
torch Faulty trigger switch.
(S1)
Replace micro switch.
trigger Fault in torch cable. Check torch cable
activated, for continuity.
no response. Loose or broken connection Check or repair
on wiring harness.
(PLG2)
connections.
Wire feed motor unplugged. Plug in motor.
(RC5)
Faulty control transformer. Check for 28VAC output.
(T2)
Loose spot timer circuit Install properly.
board.
(PC2)
Defective spot timer Replace board.
circuit board.
(CR2)(PC2)
Main power on, Pressure roll arm unlatched. Latch arm & add tension.
torch "Slippage" at drive rolls. Increase drive roll
trigger tension. See page 8.
activated, Wire path restricted. Clean path or replace
no wire feed torch liner.
but contactor 5 amp mini breaker is Reset or replace
operates & tripped.
(CB2)
breaker.
gas flows. Wire feed circuit board Calibrate wire feed
needs calibrated. circuit board. See
page 19.
Defective wire feed Replace circuit board.
circuit board.
(PC1)
Faulty wire feed motor Repair or replace
or connection.
(M)
faulty item.
Check motor on a
12VDC battery.
Faulty motor relay.
(CR1)
Sand points or replace
relay.
Loose or broken connection. Tighten or repair
connection.
(continued on following page)
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