Lincoln Electric SVM138-A Service Manual page 89

F-25
TEST PROCEDURE
1. Remove input power to the LN-9 GMA wire
feeder.
2. Using the phillips head screwdriver, remove
the screws holding the left side cover
assembly.
3. Disconnect lead #532 from the power PC
board terminal. See Figure F.1.
Electric Shock can kill.
TROUBLESHOOTING & REPAIR
T1 TRANSFORMER TEST (continued)
FIGURE F.1 – LEAD #532 AT POWER PC BOARD
LEAD 31
WARNING
• 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.
LN-9 GMA Wire Feeder
LEAD 526
LEAD 527
T1
TRANSFORMER
LEAD 532
115 VAC
4. Apply power (115VAC) to the T1 transformer
primary leads #31 and #532. See Figure F.1
and the Wiring Diagram.
5. Using the volt-ohmmeter, check for 28VAC
at secondary leads #526 and #527. See
Figure F.1. Place the meter probes where
the leads attach to the power PC board ter-
minals.
F-25