Lincoln Electric PRO-CUT 55 SVM140-A Service Manual page 53

F-16
6. If the input rectifier does not meet the accept-
able readings outlined in Table F.1, the com-
ponent may be faulty. Replace.
NOTE: Before replacing the input rectifier (D1)
check the input power switch (S1) and
perform the Primary Power Board
Resistance Test. Also check for leaky
or faulty filter capacitors.
TROUBLESHOOTING & REPAIR
INPUT RECTIFIER TEST (continued)
TABLE F.1 INPUT RECTIFIER TEST POINTS
TEST POINT TERMINALS
+ Probe - Probe
A 207
B 207
C 207
A 209
B 209
C 209
207 A
207 B
207 C
209 A
209 B
209 C
PRO-CUT 55
ANALOG METER X10 RANGE
Acceptable Meter Readings
Greater than 1000 ohms
Greater than 1000 ohms
Greater than 1000 ohms
Less than 100 ohms
Less than 100 ohms
Less than 100 ohms
Less than 100 ohms
Less than 100 ohms
Less than 100 ohms
Greater than 1000 ohms
Greater than 1000 ohms
Greater than 1000 ohms
7. If the input rectifier is good, be sure to recon-
nect leads #207, #207A and #209 to the cor-
rect terminals and torque to 31 in.-lbs. Apply
a coating of Essex D-4-8 insulating com-
pound.
8. If the input rectifier is faulty, see the Input
Rectifier Bridge Removal & Replacement
procedure. See the Wiring Diagram and
Figure F.2.
F-16