Lincoln Electric IDEALARC CV-305 - Manual (Page 52)

STATIC OUTPUT RECTIFIER BRIDGE TEST PROCEDURE
(CONTINUED)
TROUBLESHOOTING & REPAIR F-20 F-20
IDEALARC® CV-305
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.7.
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.7.
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, D4 & D5 for proper operation
using the same procedure described in Step 10.
NOTE: Diodes D1, D2 & D3 do not need to be discon-
nected for this test.
12. Reconnect all leads and Molex plugs disconnected
for this test.
13. If these tests did not identify the problem or to fur-
ther test the SCR’s, go to the
Active SCR Test.
D1
D4
D2
Capacitor
Bank
D5
Copper
Strap
D3
Positive
Heat Sink
Power Factor
Choke Lead
*
*
*
*
The Bus Bar where the D1, D2 and D3 pigtails are normally connected is not shown for clarity.
Positive lead
to Shunt
FIGURE F.7 - RECTIFIER/CAPACITOR ASSEMBLY
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