NEC SV8500 Operation And Maintenance Manual - page 644
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CHAPTER 5
Operation Procedure for System with PIR
3.1
LINE FAULT
This section explains the fault repair procedure in a case where only one specific station line is in any of the
faulty conditions listed in Table 5-2.
3.1.1
Check Point
When repairing a line fault, consider the following items:
(1) Check alarm lamps on line circuit cards.
(2) Check the fault line on the MDF.
Table 5-2 Line Fault Situation
FAULTY SITUATION
REFERENCE SECTION
When Dial Tone cannot be heard
Section 3.1.3, Line Fault - When DT Cannot Be Heard
When dialing results in a wrong connection
Section 3.1.4, Line Fault - When Dialing Results in Wrong
When the bell does not ring
Section 3.1.5, Line Fault - When Bell Does Not Ring
When call cannot be answered and speech cannot be
made
Section 3.1.6, When Call Cannot Be Answered and Speech
Dterm Fault