4RE - no audio on display unit

Problem

There is no, or only select, audio coming from the Display unit.

Symptom(s)

• No audio from the HiFi Microphone (live audio)
• No Review audio
• No button or touch-screen beeps

Solution

Summary

• Check volume settings
• Check cabling
• Check the HiFi Microphone and base
• Check the Display
• NOTE: the Display unit speakers get audio from different sources:
  • Review audio or Live HiFi Microphone audio: via the Display cable from the 4RE DVR
  • Button and screen beeps: generated on the Display unit itself

Details

1. Check volume settings
   1. While the 4RE system is on, press either the Volume + or - button on the Display unit
   2. Tap Advanced on the screen
   3. Check each of the Volume settings to be sure they are set to a level loud enough to hear
2. No HiFi Microphone audio
   1. Replace the cable from the HiFi Microphone base to the 4RE DVR
   2. Try a known working good HiFi Microphone base
      1. If this works, replace the HiFi Microphone base
   3. Try a known working good HiFi Microphone
      1. If this works, replace the HiFi Microphone
3. No audio from the Cabin Microphone when Reviewing Events
   1. IMPORTANT: Do not unplug or plug in the Cabin Microphone while the 4RE system is powered on
   2. Try a known working good Cabin Microphone
      1. If this works, replace the Cabin Microphone
4. No Review audio
   1. Re-seat the Display cable at the Display and at the 4RE DVR
   2. Try a known working good Display cable
      1. If this works, replace the Display cable
   3. Try a known working good Display
      1. If this works, replace the Display
5. No button or touch-screen beeps
   1. Try a known working good Display unit
      1. If this works, replace the Display unit