NEC SV8500 Operation And Maintenance Manual - page 672
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CHAPTER 5
Operation Procedure for System with PIR
(d) Confirm the OPE lamp of the inserted circuit card illuminates by setting the MB switch DOWN.
(e) Make a station-to-station call and see if dial tone can be heard.
[If DT is heard, check the next circuit card.]
[If DT is not heard, replace the circuit card with a spare.]
Note:
Perform this check on the rest of the circuit cards by inserting them into their individual slots.