Maintenance; Troubleshooting; Service And Repair Information - Uniden PRO 520XL Manual

– Turn the knob clockwise to boost the reception of weak
– In areas where strong signals cause noise and
Adjusting
the RF gain
– In areas where weaker signals are difficult to hear,
– Move the CH9 switch up; the radio automatically tunes
Using the
Instant
Channel 9 – Move the switch back down to return to the previous
feature

Maintenance

Every six to twelve months, check to make sure that:
► The Voltage Standing Wave Ratio (VSWR) is less than 2:1.
► All electrical connections are secure and free of corrosion.
► The antenna cable shows no wear or damage.
► All mounting screws are securely fastened.
If your radio is not performing to your expectations, please try these
simple steps. If these steps don't solve your problem, call the Uniden
Customer Service Center.
Problem:
Radio won't
turn on (no
power)
Poor reception
Background
noise
Weak
transmission

Service and repair information

► Technical information, diagrams and charts will be provided upon
request.
► Service, repair, or alignment should only be attempted by a qualified
signals, or counter-clockwise to reduce the reception of
strong signals.
distortion, reduce the RF gain (turn the knob counter-
clockwise).
increase the RF gain (turn the knob clockwise).
to channel 9 and disables the channel selector.
channel and enable the channel selector.

TROUBLESHOOTING

Things to try:
1. Check the radio's power cord and all connections.
2. Check the fuse in the radio's power cord.
3. Check your vehicle's electrical system.
1. Adjust the squelch level.
2. Check the antenna, cable and connectors.
3. Check operation mode of the radio.
1. Turn on the automatic noise limiter.
2. Adjust the squelch level.
1. Check the antenna, cable and connectors.
2. Check the antenna grounding.
3. Check for corrosion on the connectors.
8