Lead to the negative terminal. see figure f.8, Troubleshooting & repair, Probe + probe – Lincoln Electric POWER WAVE 355/405 SVM159-A User Manual
Page 75: Output diode modules test (continued)
TROUBLESHOOTING & REPAIR
F-33
F-33
POWER WAVE 355/405
OUTPUT DIODE MODULES TEST (continued)
5.
If 200 ohms is measured then the output
diodes are not “shorted”.
NOTE: There is a 250 ohm resistor across
the welding output terminals. See Wiring
Diagram
6.
If less than 200 ohms is measured, one or
more diodes or the snubber board may be
faulty.
7.
Perform the Filter Capacitor Discharge
Procedure detailed in the maintenance sec-
tion.
8.
Locate the output diode modules and snub-
ber board. See Figure F.9.
9.
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 and Replacement
Procedure for detailed instructions.
Figure F.8 Terminal Probes
_
+
- PROBE
+ PROBE