Troubleshooting & repair, Static output rectifier bridge test (continued) – Lincoln Electric IDEALARC CV-300 User Manual
Page 56
10. Test diode D1 for proper operation.
a.
Measure the resistance of diode
D1 from the anode (+ probe) to
the cathode (- probe) using an
analog volt-ohm meter
(Multimeter) set at R X 1000
scale. Resistance should be
low. See Figure F.10.
FIGURE F.10 - Diode D1 test points.
b.
Reverse the meter leads and
measure the resistance from the
cathode (+ probe) to anode (-
probe) of D1. Resistance
should be High. See Figure
F.10.
c.
If the resistance is low for both
tests a and b, the diode is short-
ed. Replace.
d.
If the resistance is high for both
test a and b, the diode is open.
Replace.
11. Test Diodes D2, D3, and D4 for
proper operation using the same
procedure described in Step 10.
12. Reconnect all leads and Molex
plugs disconnected for this test.
13. If this test did not identify the prob-
lem or to further test the SCR, go to
the
STATIC OUTPUT RECTIFIER BRIDGE TEST (CONTINUED)
F-17
TROUBLESHOOTING & REPAIR
F-17
IDEALARC CV-300