Troubleshooting - Sony CDX-M20 Operating Instructions (CDX-M20) Operating Instructions Manual

Troubleshooting

The following checklist will help you remedy
problems you may encounter with your unit.
Before going through the checklist below,
check the connection and operating
procedures.
For details on using the fuse and removing the
unit from the dashboard, refer to the
installation/connections manual supplied with
this unit.
General
No power is being supplied to the unit.
 Check the connection or fuse.
 If the unit is turned off and the display
disappears, it cannot be operated with the
remote commander.
– Turn on the unit.
The power antenna (aerial) does not extend.
 The power antenna (aerial) does not have a
relay box.
No sound.
 The ATT function is activated.
 The position of the fader control "FAD" is not
set for a 2-speaker system.
No beep sound.
 The beep sound is canceled (page 14).
 An optional power amplifier is connected and
you are not using the built-in amplifier.
The contents of the memory have been
erased.
 The power supply lead or battery has been
disconnected or it is not connected properly.
Stored stations and correct time are erased.
The fuse has blown.
Makes noise when the position of the
ignition is switched.
 The leads are not matched correctly with the
boat's accessory power connector.
20
During playback or reception,
demonstration mode starts.
 If no operation is performed for 5 minutes
with "DEMO-ON" set, demonstration mode
starts.
– Set "DEMO-OFF" (page 14).
The display disappears from/does not
appear in the display window.
 The dimmer is set to "DIMMER-ON"
(page 14).
 The display disappears if you press and hold
.
– Press  on the unit until the
display appears.
 The connectors are dirty (page 18).
The Auto Off function does not operate.
 The unit is turned on. The Auto Off function
activates after turning off the unit.
– Turn off the unit.
Radio reception
The stations cannot be received.
The sound is hampered by noises.
 The connection is not correct.
– Connect a power antenna (aerial) control
lead (blue/white-striped) or accessory power
supply lead (red) to the power supply lead of
a boat's antenna (aerial) booster (only when
your boat has built-in FM/AM antenna
(aerial)).
– Check the connection of the boat antenna
(aerial).
– If the auto antenna (aerial) will not go up,
check the connection of the power antenna
(aerial) control lead.
 The tuning step setting has been erased.
– Set the tuning step again (page 6).
Preset tuning is not possible.
 Store the correct frequency in the memory.
 The broadcast signal is too weak.
Automatic tuning is not possible.
 The broadcast signal is too weak.
– Perform manual tuning.