Wire Feed And Weld Problems; Rectifier Assembly Test Procedure - Thermal Arc Fabricator 140 Service Manual

ADVANCED TROUBLESHOOTING

6.10 Wire Feed and Weld Problems

A. Poor or inconsistent arc transfer or no arc transfer.
1. Poor work cable connection or open work cable.
a. Clean contact point where the work cable
attaches to the work piece.
b. Check continuity of the work cable.
B. Other welding problems.
1. See Section 5.04 Solving Problems Beyond the
Welding Terminals.
January 25, 2008

6.11 Rectifier Assembly Test Procedure

A. Remove the inside cover.
B. Replace the Rectifier Assembly if shorted or open
diode is found. Reconnect wires previously removed
from terminals A and AC1.
A +OUT
AC1 AC2
Figure 6-1: Rectifier Connection Points
6-5
FABRICATOR 140, 180
1. Disconnect and isolate the black wire from the
negative capacitor terminal (A). Refer to Figure
6-1.
2. Disconnect and isolate the transformer wire from
terminal AC1. Refer to Figure 6-1.
3. Using a multimeter set to diode test scale, perform
the checks as indicated in the chart.
METER (+) METER (-)
-OUT +OUT
-OUT AC1
-OUT AC2
+OUT -OUT
AC1 -OUT
AC2 -OUT
+OUT AC1
+OUT AC2
AC1 +OUT
AC2 +OUT
-OUT
INDICATION
Open
Open
Open
(2) Diode drop
Diode drop
Diode drop
Diode drop
Diode drop
Open
Open
Art # A-08255
Manual 0-4992