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TROUBLESHOOTING & REPAIR
STATIC SCR TEST (continued)
FIGURE F.15 – HEAT SINK TEST POINTS
ANODE
CATHODE
REMOVE
INSULATING
PAINT
6. If a high or infinite resistance is indicated for | 8. Replace plug J9 into the thermal fan/snub- |
both steps #4 and #5, SCR1 is not shorted. | ber board and plug J5 into the firing board. |
7. If a low resistance is indicated in either steps | NOTE: To further check the SCRs’ functions use |
#4 or #5, there is a shorted SCR in the out- | an SCR tester and proceed to the Active SCR |
put rectifier bridge. Repeat steps #4 and #5 | Test. |
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. |
|
