Lincoln Electric INVERTEC V275-S Service Manual page 57

F-27
OUTPUT DIODE MODULES TEST (continued)
5. If 200 ohms is measured then the output
diodes are not "shorted".
NOTE: There is a 200 ohm resistance across
the welding output terminals.
Diagram.
6. If less than 200 ohms is measured, one or
more diodes or the snubber board may be
faulty.
NOTE: This test checks for shorted diodes
only.
7. Using a 5/16" nut driver remove the case
wraparound cover.
TROUBLESHOOTING & REPAIR
Figure F.8 - Terminal Probes
See Wiring
V275-S
(Below code 11250 only)
O F F
ON
OFF
8. Perform the Input
Discharge Procedure detailed earlier in this
section.
9. Locate the output diode modules and snub-
ber board. See Figure F.9.
10. Test all output diode modules individually.
NOTE: This may require the disassembly of
the leads and the snubber board from the
diode modules. Refer to the Output Diode
Modules Removal
Procedure for detailed instructions.
F-27
Filter Capacitor
and Replacement