Trouble Shooting - Boss 644UA Owner's Manual

Mp3-compatible in-dash am/fm cd receiver with front panel usb port, sd memory card port and aux input
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TROUBLE SHOOTING

Before going through the checklist, check wiring connection. If any of the problems
persist after checklist has been made, consult your nearest service dealer.
Symptom
No power.
Disc cannot be
loaded or
ejected.
No sound.
Sound skips.
The operation
keys do not
work.
The radio does
not Work. The
radio station
automatic
selection does
not work.
Cause
The car ignition switch is
not on.
The fuse is blown.
Presence of CD disc
inside the player.
Inserting the disc in reverse
direction.
Compact disc is extremely
dirty or defective.
Temperature inside the car
is too high.
Condensation.
Volume is in minimum
Wiring is not properly
connected.
The installation angle is
more than 30 degrees.
The disc is extremely
dirty or defective.
The built-in microcomputer
is not operating properly
due to noise.
The antenna cable is not
connected.
The signals are too weak.
If the power supply is
connected to the car accessory
circuits, but the engine is not
moving, switch the ignition key
to "ACC".
Replace the fuse.
Remove the disc in the player,
then put a new one.
Insert the compact disc with the
label facing upward.
Clean the disc or try to play a new
one.
Cool off until the temperature
returns to normal.
Leave the player off for an hour or
so, then try again.
Adjust volume to a desired level.
Check wiring connection.
Adjust the installation angle less
than 30 degrees.
Clean the compact disc, then try to
play a new one.
Press the RESET button.
Front panel is not properly fixed into
its place.
Insert the antenna cable firmly.
Select a station manually.
16
Solution

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