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DSX-M50BT

Maintenance

Replacing the lithium battery of the
remote commander

When the battery becomes weak, the range
of the remote commander becomes shorter.
Replace the battery with a new CR2025
lithium battery. Use of any other battery may
present a risk of fire or explosion.

Notes on the lithium battery

Keep the lithium battery out of the reach of
children. Should the battery be swallowed,
immediately consult a doctor.

Wipe the battery with a dry cloth to assure a good
contact.

Be sure to observe the correct polarity when
installing the battery.

Do not hold the battery with metallic tweezers,
otherwise a short-circuit may occur.

Cleaning the connectors

The unit may not function properly if the
connectors between the unit and the front
panel are not clean. In order to prevent this,
detach the front panel (page 9) and clean the
connectors with a cotton swab. Do not apply
too much force. Otherwise, the connectors
may be damaged.

WARNING

Battery may explode if mistreated.
Do not recharge, disassemble, or dispose
of in fire.

+ side up

SECTION 1

SERVICING NOTES

UNLEADED SOLDER

Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(

Caution:

Some printed circuit boards may not come printed with

the lead free mark due to their particular size)

: LEAD FREE MARK

Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40 °C higher

than ordinary solder.

Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.

Soldering irons using a temperature regulator should be set to
about 350 °C.

Caution:

The printed pattern (copper foil) may peel away if

the heated tip is applied for too long, so be careful!

• Strong

viscosity

Unleaded solder is more viscous (sticky, less prone to

ow)

than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.

• Usable with ordinary solder

It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.

ABOUT CHECKING THE OPERATION

When checking the operation of this unit, connect a USB device
to this unit.
Refer to the support site written in the operating instruction for the
details about the compatibility of a USB device.

NOTE OF REPLACING THE KEY BOARD

When the KEY board is defective, exchange the FRONT PANEL
ASSY (Ref. No. FP1).

NOTE OF REPLACING THE BT BOARD

When the BT board is defective, exchange the complete mounted
board.

NOTE OF REPLACING THE IC603 ON THE MAIN BOARD

IC603 on the MAIN board cannot exchange with single. When this
part is damaged, exchange the complete mounted board.

IMPORTANT NOTE OF “INITIALIZING”

The purpose of “Bluetooth Initialize” is to initialize the Bluetooth
connection history (HF/Audio Streaming). (To delete the device
information for the devices that you connected to when searching,
etc.)
When the BT board or MAIN board (including BT board) are re-
placed, it is necessary to initialize this unit.
Refer to the following, initialize this unit.

Note:

Phonebook data and dialed/received call history can be deleted by

executing “Bluetooth Initialize.”

Procedure:

1. In the state of source off (the clock is displayed), press and

hold the [PUSH ENTER/SELECT/ ] button.

2. Rotate the control dial, and select the “BT INIT”.
3. Press the [PUSH ENTER/SELECT/ ] button, and the mes-

sage “INIT-NO” is displayed on the liquid crystal display.

4. Rotate the control dial clockwise, and the message “INIT-

YES” is displayed on the liquid crystal display.

5. Press the [PUSH ENTER/SELECT/ ] button, and the mes-

sage “INITIAL” is blinked on the liquid crystal display.