Tests detailed in table f.1, Troubleshooting & repair, Input rectifier test (continued) – Lincoln Electric PRO-CUT 55 SVM140-A User Manual
Page 53
TROUBLESHOOTING & REPAIR
F-16
F-16
PRO-CUT 55
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.
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.
INPUT RECTIFIER TEST (continued)
TEST POINT TERMINALS
ANALOG METER X10 RANGE
+ Probe
- Probe
Acceptable Meter Readings
A
207
Greater than 1000 ohms
B
207
Greater than 1000 ohms
C
207
Greater than 1000 ohms
A
209
Less than 100 ohms
B
209
Less than 100 ohms
C
209
Less than 100 ohms
207
A
Less than 100 ohms
207
B
Less than 100 ohms
207
C
Less than 100 ohms
209
A
Greater than 1000 ohms
209
B
Greater than 1000 ohms
209
C
Greater than 1000 ohms
TABLE F.1 INPUT RECTIFIER TEST POINTS