Lincoln Electric IM355-C LN-9 GMA Operator's Manual page 59

E-5
Observe Safety Guidelines
detailed in the beginning of this manual.
PRObLEMS
(SYMPTOMS)
Gun trigger works and arc can be
struck. Unit then shuts down while
welding, or voltage output too low to
establish arc (LN-9 ACTUAL VOLTS
meter reading is low, zero or
negative when trigger is closed).
If for any reason you do not understand the test procedures or are unable to perform the necessary tests/repairs
safely, contact your local authorized field service facility before you proceed.
TROUbLESHOOTING
POSSIbLE AREAS OF
MISADJUSTMENT(S)
WIRE FEEDING PRObLEMS
1. Check to see if the wire feeder or
power source "Electrode Polarity"
switches are set properly. Set
Polarity Switches
position. See
"Electrode Polarity Switch" in
the Operation section.
2. Check to make sure lead #21 has
continuity (zero ohms) to the work
piece.
3. Check that the power source
voltage control
REMOTE. R3S or DC-power
source voltage control switch
must be set to REMOTE.
4. Check that the LN-9 GMA control
cable leads or weld cables are
properly connected to the power
source. Refer to the connection
diagram for the LincoIn power
source being used.
5. Check to see if the 1/8 A fuse on
Voltage P.C. board is blown. If it
is, determine cause of fuse
blowing.
6. Determine whether the welding
power source is able to supply
SET voltage. If not, reset the
output range controls of the
power source so it can supply
SET voltage.
CAUTION
LN-9 GMA and LN-9F GMA Wire Feeder
TROUbLESHOOTING GUIDE
RECOMMENDED
COURSE OF ACTION
If all recommended possible
areas of misadjustment have
been checked and the problem
in proper persists,
the topic Lincoln Authorized Field Service
Facility.
is set for
E-5
contact your local