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TROUBLESHOOTING & REPAIR
F-49 F-49
LN-9 GMA Wire Feeder
OUT OF VOLTAGE RANGE SHUT DOWN TEST (continued)
FIGURE F.12 – VOLTAGE PC BOARD WITH JUMPERS
BYPASS
PINS
1/8 AMP
FUSE
TEST PROCEDURE
1. Remove input power to the LN-9 GMA wire
feeder.
2. Using the phillips head screwdriver, remove
the screws from the left side cover assembly.
3. Lift the left side cover assembly.
4.
Locate the voltage PC board. Jumper together
the "BYPASS" pins on the LN-9 GMA voltage
PC board. See Figure F.12. (On older voltage
boards these pins may be labeled "B".) This
should disable the shut down circuit.
ELECTRIC SHOCK can kill.
• With power applied, there
are high voltages inside
the wire feeder. Do not
reach into the wire feeder
or touch any internal part
of the wire feeder while
power is applied.
5. Connect to a Lincoln Electric CV power
source per connection diagram. See the
Installation
section of this manual.
6. Start welding and observe the ACTUAL volt-
age reading on the LN-9 GMA digital meter.
The actual voltage must match the SET volt-
age within ± 0.5V. If it does NOT, the LN-9
GMA is designed to shut down.
7. If the LN-9 GMA continues to shut down with
the "BYPASS" pins jumpered together, the
voltage PC board may be faulty.
WARNING