Lincoln Electric IDEALARC CV-305 - Manual (Page 60)

ACTIVE SCR RECTIFIER ASSEMBLY TEST PROCEDURE
(CONTINUED)
TROUBLESHOOTING & REPAIR F-28 F-28
IDEALARC® CV-305
10. Close switch SW-1.
NOTE: Switch SW-2 should be open.
11. Read meter for zero voltage.
a. If the voltage reading is higher than zero, the
SCR is shorted.
12. Close or keep closed switch SW-1.
13. Close switch SW-2 for 2 seconds and release and
read meter.
a. If the voltage is 3 - 6 volts while the switch is
closed and after the switch is open, the SCR is
functioning.
b. If the voltages is 3-6 volts only when the switch
is closed or there is no voltage when the switch
is closed, the SCR is defective.
NOTE: Be sure battery is functioning properly. A low
battery can affect the results of the test. Repeat
Battery Test Procedure in Step 6 if needed.
14. Open switch SW-1.
15. Reconnect the Tester leads. See
Figure F.16.
a. Connect Tester lead (A) to the cathode.
b. Connect Tester lead (C) to the anode.
c. Disconnect Test lead (G) from the gate.
16. Close switch SW-1.
17. Read meter for zero voltage.
a. If the voltage is zero, the SCR is functioning.
b. If the voltage is higher than zero, the SCR is
shorted.
18. Perform the Active Test Procedure outlined in Steps
9-17 for SCR 2.
19. Replace all SCR assemblies that do not pass the
above tests.
20. Reconnect all disconnected leads and Molex Plugs.
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