VOICECOM USER MANUAL ISSUE 4
-55-
CHAPTER 7 – Troubleshooting
VoiceCom system
Symptom
Cause
Remedy
Constant digital noise on
line
Faulty VAA unit
Isolate individual unit and replace
Poor\Faulty wiring*
See notes.
VCA has incorrect settings
Adjust VCA settings to turn digital comms
off with audio
Thresholds on VAA units to
low
Adjust threshold settings on the VAA units
emitting the digital noise
Fails pre-start
Service factor setting on
VCA to low
Increase service factor setting on VCA
Faulty VAA units**
Isolate individual units fault and replace
Speakers
Replace faulty speaker\s
iMAC or PED noise on line Poor\Faulty wiring*
See notes.
Voice message’s not
playing
Incorrect settings on VCA
Check message initiation mode
*Wiring issues, any of the following can cause VoiceCom system faults:
Spare cores on line not earthed at one point
Shield not earthed at one point
Spare cores not continuous
Shield not continuous
Shorting of any 4 voice com system wires
Summary of Contents for VAA
Page 73: ...VOICECOM USER MANUAL ISSUE 4 77 APPENDIX G I S Approvals ...
Page 74: ...VOICECOM USER MANUAL ISSUE 4 78 ...
Page 75: ...VOICECOM USER MANUAL ISSUE 4 79 ...
Page 76: ...VOICECOM USER MANUAL ISSUE 4 80 ...
Page 77: ...VOICECOM USER MANUAL ISSUE 4 81 ...
Page 78: ...VOICECOM USER MANUAL ISSUE 4 82 ...
Page 79: ...VOICECOM USER MANUAL ISSUE 4 83 ...