Lincoln Electric IDEALARC CV-305 - Manual (Page 59)

ACTIVE SCR RECTIFIER ASSEMBLY TEST PROCEDURE
(CONTINUED)
TROUBLESHOOTING & REPAIR F-27 F-27
IDEALARC® CV-305
ANODE
CATHODE
7. Remove the red insulating paint from the heat sink
test points. See Figure F.12.
NOTE: DO NOT DISASSEMBLE THE SCR RECTIFI-
ER HEAT SINK ASSEMBLY.
8. Construct the circuit shown in Figure F.13. One 6-
volt lantern battery can be used. R1 and R2 resis-
tor values are 010%. Set voltmeter scale low, at
approximately 0-5 volts or 5-10 volts.
a. Test the voltage level of the battery. Short
leads (A) and (B). Close switch SW-1. Battery
voltage should be 4.5 volts or higher. If lower,
replace the battery.
9. Connect the Tester to the SCR 1 as shown in
Figure F.13.
a. Connect Tester lead (A) to the anode.
b. Connect Tester lead (C) to the cathode.
c. Connect Tester lead (G) to the gate at the
Control Board connector J1).See the
Wiring
Diagram.
FIGURE F.12
FIGURE F.13 - SCR TESTER
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