Lincoln Electric RED-D-ARC DX450 Service Manual page 100

F-56
(+) Lead
11. Reconnect all leads.
12. Perform the Case Cover replacement Procedure.
TROUBLESHOOTING AND REPAIR
TABLE F.2 – DIODE TEST TABLE
Test Instrument
AC1
AC2
AC3
DC(-)
DC(-)
DC(-)
AC1
AC2
AC3
DC(+)
DC(+)
DC(+)
(-) Lead
and Expected
DC(+) FORWARD BIAS
(Low Resistance)
DC(+) FORWARD BIAS
(Low Resistance)
DC(+) FORWARD BIAS
(Low Resistance)
AC1 FORWARD BIAS
(Low Resistance)
AC2 FORWARD BIAS
(Low Resistance)
AC3 FORWARD BIAS
(Low Resistance)
DC(-) REVERSE BIAS
(High Resistance)
DC(-) REVERSE BIAS
(High Resistance)
DC(-) REVERSE BIAS
(High Resistance)
AC1 REVERSE BIAS
(High Resistance)
AC2 REVERSE BIAS
(High Resistance)
AC3 REVERSE BIAS
(High Resistance)
DX450
Diode Bias
Test Result
F-56