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6. If a high or infinite resistance is indicated for
both steps #4 and #5, SCR1 is not shorted.
7. If a low resistance is indicated in either steps
#4 or #5, there is a shorted SCR in the out-
put rectifier bridge. Repeat steps #4 and #5
for each of the six SCRs. It may be neces-
sary to disconnect the transformer sec-
ondary leads from the rectifier assembly to
isolate the defective SCR(s). See the Wiring
Diagram.
8. Replace plug J9 into the thermal fan/snub-
ber board and plug J5 into the firing board.
NOTE: To further check the SCRs’ functions use
an SCR tester and proceed to the Active SCR
Test.
TROUBLESHOOTING & REPAIR
F-37 F-37
IDEALARC DC-655
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STATIC SCR TEST (continued)
FIGURE F.15 – HEAT SINK TEST POINTS
ANODE
CATHODE
REMOVE
INSULATING
PAINT