NEC SV8500 Operation And Maintenance Manual - page 698
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CHAPTER 5
Operation Procedure for System with PIR
4.11 Tone Fault
This section explains the fault repair procedure when any of the various tones cannot be heard in the whole
system.
4.11.1 Check Point
When repairing a tone fault, consider that the tone generator circuit is equipped in the TSW circuit card
and supplies tone.
The figure below shows an example of the related trunking for dial tone connection.
Figure 5-24 Dial Tone Connection
4.11.2 Tone Fault
(1) When overall tone is faulty.
•
Replace the TSW circuit card with a spare and check.
(2) When Hold Tone only is faulty.
(3) The following patters are available as a Music-On-Hold source. Check each card, equipment.
•
EMA SUB-A (for 1-IMG only)
•
PLO (for 4-IMG only)
•
External Music-On-Hold
Perform the following procedure when external MOH is used.
STEP 1
Check the External Music-On-Hold device.
STEP 2
Check the jumper connections on MDF.
TSW
DT
LC
Dial
Tone
ORT