Lincoln Electric PRO-CUT 25 Service Manual page 46

F-14
MAIN INVERTER BOARD RESISTANCE TEST (continued)
9. Check Diodes D1, D2, & D3 for "shorts" or
"opens". Keep in mind that unless these devices
are electrically isolated from the circuit, some
resistance will be read in both polarities. See the
Wiring Diagram.
LEAD 2 (NZL)
WRK
LEAD 3 (EL)
Plug J1
Harness
Plug
RIGHT SIDE OF MACHINE
D2
TROUBLESHOOTING & REPAIR
Figure F.4
D2
D3
PRO-CUT 25
D3
D1
D1, D2, & D3
D1
F-14