Uniden MHS550 Owner's Manual page 57

Troubleshooting
SYMPTOM
Won't power ON.
When the PTT is pressed -
TX icon appears and
another radio can hear a
'click' but no audio is
heard.
When scanning, radio
stops on a particular
channel all the time.
There is noise on the
receiver that the squelch
will not eliminate.
You made arrangements
to communicate with
another VHF radio on a
specific channel, and you
cannot hear them.
You cannot change the
transmit power setting.
The SCAN/MEM key does
not start scanning.
You can hear
transmissions, but the
other radio cannot hear
you.
Uniden MHS550 Radio Owner's Manual
CAUSE
Low or Discharged battery
pack.
Bad microphone element
A source of noise is
nearby.
An external noise is being
generated by some device.
You and the other user are
using different country
modes (USA/CAN/INT)
You selected a channel
that is limited to a 1watt
transmit power such as
channel 13, or you selected
a 'receive only' channel
such as Weather band.
Cause 1: No channels
have been stored in
memory.
Cause : Squelch is not
adjusted correctly.
The transmit power is set
to 1W watt.
REMEDY
Recharge Lithium Ion battery.
Replace battery.
Use alkaline batteries
temporarily.
Send in for repair.
Turn Squelch clockwise to
reduce noise so that scan
function skips channel or
remove channel from scan.
Turn off the offending device or
contact the device
manufacturer regarding FCC
Part 15 "unintentional radiator."
Be sure both are using the
same country mode. Some
modes use the same numeric
selections. Channel 16, the
Distress, Safety, and Calling
channel is the same on all three
modes.
Change to an unrestricted
Transmit/receive channel.
Remedy 1: Use the
SCAN/MEM key to store
several selected channel in
memory.
Remedy : Adjust the Squelch
setting to a point just below that
when the background noise
disappears.
Use BAND/1/2.5/5W to change
to a higher transmit power level.
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