Lincoln Electric POWER WAVE SVM173-A - Manual (Page 63)

TROUBLESHOOTING & REPAIR
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INPUT RECTIFIER TEST (CONTINUED)
6. Use the analog ohmmeter to perform the
tests detailed in Table F.1.
7. If the input rectifier does not meet the
acceptable readings outlined in the table,
the component may be faulty. Replace.
NOTE: Before replacing the input rectifier, per-
form the Switch Board Test.
8. When installing a new input rectifier, see
Input Rectifier Removal and Replacement
procedure.
9. If the input rectifier is good, be sure to
reconnect the positive and negative leads
to the correct terminals and torque to 31
in.-lbs. See the Wiring Diagram.
10. Replace any silicone sealant previously
removed.
11. Reassemble and test.
TEST POINT TERMINALS
A
B
C
A
B
C
NEG
NEG
NEG
POS
POS
POS
NEG
NEG
NEG
POS
POS
POS
A
B
C
A
B
C
Greater than 1000 ohms
Greater than 1000 ohms
Greater than 1000 ohms
Approx. 500 ohms or less
Approx. 500 ohms or less
Approx. 500 ohms or less
Approx. 500 ohms or less
Approx. 500 ohms or less
Approx. 500 ohms or less
Greater than 1000 ohms
Greater than 1000 ohms
Greater than 1000 ohms
TABLE F.1 – INPUT RECTIFIER TEST POINTS AND ACCEPTABLE READINGS
ANALOG METER X100
RANGE
Acceptable Meter Readings + Probe - Probe
This test can be performed using a digital volt/ohm meter on the “diode test” setting. Acceptable meter
readings are: open or O.L., For the “Greater than 1000 ohms” and a decimal value less than one (exam-
ple 0.045) in the approx 500 ohms position.