Snap-on Tools Corporation Kenosha, WI 53141-1410
15
TROUBLE SHOOTING
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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
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- 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)
