NEC SV8500 Operation And Maintenance Manual - page 33
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975
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TABLE OF CONTENTS (CONTINUED)
Page
2.7 Replacement Procedure of 1U–C/DC Power Unit on 9U–IR (DC Power Input Version) . . . . . . .
When Call Cannot Be Answered and Speech Cannot Be Made . . . . . . . . . . . . . . . . . . .
Unit Fault - ACT-Side MUX Card Is Faulty and System Has Changed Over . . . . . . . . . .
Speech Path System Fault - When Dial Tone (DT) Cannot Be Heard . . . . . . . . . . . . . . .
Speech Path System Fault - STBY Side Has Become Fault . . . . . . . . . . . . . . . . . . . . . .
Control System Fault - Fault Occurs Intermittently on ACT side . . . . . . . . . . . . . . . . . . .