Operating Instructions

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Troubleshooting
Before requesting service, make the following checks. If
you are uncertain about some of the check points, or if the
solutions indicated in the following guide does not resolve
the issue, then consult your dealer for instructions.
Sound is distorted or no sound.
≥ Adjust the volume.
≥ If an AC mains lead or fluorescent lights are near the cords, then keep
other appliances and cords away from the cables.
Cannot turn on the unit.
≥ After connecting the AC mains lead or installing the batteries, wait
about 10 seconds before turning on the unit.
Humming heard during playback.
≥ If an AC mains lead or fluorescent lights are near the cords, then keep
other appliances and cords away from the cables.
The unit does not work.
≥ One of the unit's safety devices may have been activated.
1 Press [Í/I] on the unit to switch the unit to standby.
≥ If the unit does not turn off, remove the batteries, and
disconnect the AC mains lead from the AC mains socket.
After about 30 seconds, insert the batteries or reconnect
the AC mains lead to the AC mains socket. Then wait for
about 10 seconds.
2 Press [Í/I] on the unit to switch it on.
If the unit still cannot be operated, consult the dealer.
The display panel lights up and changes continuously
in standby mode.
≥ Press and hold [∫] on the unit until “SDEMO OFF” is displayed.
The remote control does not work properly.
≥ The battery is depleted or inserted incorrectly. (l 6)
≥ Keep mobile phones and smart devices away from this unit.
Incorrect display or play does not start.
≥ Make sure that the disc is compatible with this unit. (l 15)
≥ There is moisture on the lens. Wait for about an hour and then try
again.
No response when [1/;] is pressed.
≥ Disconnect the USB device and then reconnect it. Alternatively, turn
the unit off and on again.
The USB device or its contents cannot be read.
≥ The USB device format or its contents is/are not compatible with the
unit (l 15).
≥ The USB host function of this product may not work with some USB
devices.
Slow operation of the USB device.
≥ Large file size or high memory USB device takes longer time to read.
The elapsed time displayed is different from the actual
play time.
≥ Copy the data to another USB device or backup the data and reformat
the USB device.
[D552] DAB/DAB+ reception is poor.
≥ Keep the antenna away from computers, televisions, other cables and
cords.
≥ Move the unit to another location and do a full scan again.
If noise is excessive during FM reception.
≥ Change the audio to be output as monaural.
1 Press [PLAY MENU] repeatedly to select “FM MODE”.
2 Press [3, 4] to select “MONO” and then press [OK].
The sound becomes monaural.
≥ To cancel, select “STEREO” or change the frequency.
In normal circumstances, select “STEREO”.
Static or noisy reception is heard while listening to a
radio broadcast.
≥ Check and adjust the antenna.
≥ Try to keep a certain amount of distance between the antenna and AC
mains lead.
≥ Turn the TV or other audio players off or separate it from this unit.
≥ Keep mobile phones away from this unit.
≥ Noise would be heard when batteries are low. Connect the AC mains
lead or replace batteries.
To return all settings to the factory defaults
When the following situations occur, reset the memory:
≥ There is no response when buttons are pressed.
≥ You want to clear and reset the settings.
Preparation
Remove the batteries from this unit.
1 Disconnect the AC mains lead. (Wait for at least
30 seconds before proceeding to step 2.)
2 While pressing and holding down [Í/I] on the unit,
reconnect the AC mains lead.
≥ Keep holding down [Í/I] until “--------” appears on the
display.
3 Release [Í/I].

≥ The settings are returned to the factory defaults. It is necessary
to set the settings again.
General
Remote control
Disc
USB
Radio