Lincoln Electric IDEALARC CV-300 Service Manual page 56

F-17
STATIC OUTPUT RECTIFIER BRIDGE TEST (CONTINUED)
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
(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.
should be High.
F.10.
c. If the resistance is low for both
tests a and b, the diode is
shorted. 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.
TROUBLESHOOTING & REPAIR
volt-ohm meter
12. Reconnect all leads and Molex
13. If this test did not identify the prob-
Resistance
See Figure
IDEALARC CV-300
plugs disconnected for this test.
lem or to further test the SCR, go to
the Active SCR Test.
F-17