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
Retur
n to Section TOC
Retur
n to Section TOC
Retur
n to Section TOC
Retur
n to Section TOC
Retur
n to Master TOC
Retur
n to Master TOC
Retur
n to Master TOC
Retur
n to Master TOC
STATIC SCR TEST
(continued)
FIGURE F.15 – HEAT SINK TEST POINTS
ANODE
CATHODE
REMOVE
INSULATING
PAINT
