Doro PMR 510 - Manual (Page 8)

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Troubleshooting
The handset will not turn on
- Check the batteries are installed correctly.
- Ensure the batteries are in good condition and/or are fully charged.
Cannot change channel or volume setting
- Ensure the Channel Lock function is not active.
Reduced operating range
- Batteries may be failing, replace or recharge batteries if the indicator shows
low.
- Operating in built up areas or undulating terrain? Line of sight/flat open
environment provides for maximum range.
No or Weak reception
- Are both handsets set to the same channel?
- Reduce the distance between the handsets.
- Increase the receive volume.
- Activate the monitor function.
Sound is distorted
- Speak clearly towards the handset from a distance of 10cm.
- Adjust the receive volume to a comfortable level.
- Check the battery charge level.