NEC SV8500, Operation And Maintenance Manual

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CHAPTER 5 Operation Procedure for System with PIR
<<For Single Configuration>>
<<Check by replacing the MUX circuit card.>>
(1) After replacement of the MUX circuit card, make a station-to-station call in the faulty unit and see if speech
is normal.
(a) Replace the MUX circuit card by referring to Section 1.5, Replacement Procedure of MUX (Multi-
plexer) Circuit Card .
<<Check by replacing the TSW circuit card.>>
(2) After replacement of the TSW circuit card, make a station-to-station call in the faulty unit and see if speech
is normal.
(a) Replace the TSW circuit card referring to Section 1.7, Replacement Procedure of TSW (Time Division
Switch) Circuit Card .
(3) Check the line/trunk circuit cards mounted in the unit to see if they are faulty.
(a) Set the MB switch of the line/trunk circuit card UP and extract it from its mounting slot.
(b) Make a station-to-station call and see if a fault occurs.
(4) Perform this check on an individual basis.
(a) If the fault has stopped, the circuit card extracted at that time is faulty. Replace the circuit card with a
spare.
(b) If the fault continues, check the next circuit card.