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US Model

CDX-M50IP

AEP Model

UK Model

E Model

CDX-MR50IP

2007L04-1
© 2007.12

Signal-to-noise ratio

120 dB

Frequency response

10 – 20,000 Hz

Wow and flutter

Below measurable limit

Tuning range

CDX-M50IP:
87.5 – 108.0 MHz (at 50 kHz step)
87.5 – 107.9 MHz (at 200 kHz step)
CDX-MR50IP:
87.5 – 108.0 MHz

FM tuning interval

CDX-M50IP:
50 kHz/200 kHz switchable

Antenna (aerial) terminal

External antenna (aerial) connector

Intermediate frequency 10.7 MHz/450 kHz
Usable sensitivity

9 dBf

Selectivity

75 dB at 400 kHz

Signal-to-noise ratio

67 dB (stereo), 69 dB (mono)

Harmonic distortion at 1 kHz

0.5% (stereo), 0.3% (mono)

Separation

35 dB at 1 kHz

Frequency response

30 – 15,000 Hz

Tuning range

531 – 1,602 kHz (at 9 kHz step)
530 – 1,710 kHz (at 10 kHz step)

AM tuning interval

9 kHz/10 kHz switchable

Antenna (aerial) terminal

External antenna (aerial) connector

Intermediate frequency 10.7 MHz/450 kHz
Sensitivity

30 µV

• The tuner and CD sections have no adjustments.

Model Name Using Similar Mechanism

NEW

CD Drive Mechanism Type

MG-101FC-188//Q

Optical Pick-up Name

DAX-25A

– Continued on next page –

Photo: CDX-M50IP

POWER OUTPUT AND TOTAL HARMONIC DISTORTION
23.2 watts per channel minimum continuous average power into
4 ohms, 4 channels driven from 20 Hz to 20 kHz with no more
than 5% total harmonic distortion.

2

If the optical pick-up block is defective, please replace the whole
optical pick-up block.
Never turn the semi-fixed resistor located at the side of optical pick-
up block.

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous
radiation exposure.

Tuning range

MW: 531 – 1,602 kHz
LW: 153 – 279 kHz

Antenna (aerial) terminal

External antenna (aerial) connector

Intermediate frequency 10.7 MHz/450 kHz
Sensitivity

MW: 30 µV, LW: 40 µV

Outputs

Speaker outputs (sure seal connectors)

Speaker impedance

4 – 8 ohms

Maximum power output

52 W 

×

 4 (at 4 ohms)

Outputs

Audio outputs terminal (front, rear/sub
switchable)
Power antenna (aerial) relay control terminal
Power amplifier control terminal

Inputs

Telephone ATT control terminal
Illumination control terminal
BUS control input terminal
BUS audio input terminal
Remote controller input terminal
Antenna (aerial) input terminal
AUX input jack (stereo mini jack)
iPod signal input terminal (dock connector)

Tone controls

Low: ±10 dB at 60 Hz (XPLOD)
Mid: ±10 dB at 1 kHz (XPLOD)
High: ±10 dB at 10 kHz (XPLOD)

Power requirements

12 V DC boat battery (negative ground (earth))

Dimensions

Approx. 178 

×

 50 

×

 180 mm

(7

 1/8

 

×

 2 

×

 7

 1/8

 in.) (w/h/d)

Mounting dimensions

Approx. 182 

×

 53 

×

 162 mm

(7

 1/4

 

×

 2

 1/8

 

×

 6

 1/2

 in.) (w/h/d)

Mass

Approx. 1.4 kg (3 lb. 2 oz.)

Supplied accessories

Card remote commander: RM-X151
AUX cap
Parts for installation and connections (1 set)

MPEG Layer-3 audio coding technology and
patents licensed from Fraunhofer IIS and Thomson.

iPod is a trademark of Apple Inc., registered in
the U.S. and other countries.

optical pick-up

semi-fixed resistor

The laser diode in the optical pick-up block may suffer electrostatic
breakdown because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic breakdown and also use
the procedure in the printed matter which is included in the repair
parts.
The flexible board is easily damaged and should be handled with
care.

The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.

0

0

3

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.)

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 flow)
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.

This label is located on the bottom of the chassis.

This compact disc player is classified as a CLASS 1 LASER
product. The CLASS 1 LASER PRODUCT label is located on the
exterior.

• CDX-MR50IP

• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be damaged

by heat.

Please use the following test discs for the check on the CD section.

YDES-18 (Part No. 3-702-101-01)
PATD-012 (Part No. 4-225-203-01)

You can play CD-DA (also containing CD TEXT) and CD-R/
CD-RW (MP3/WMA/AAC files).

Type of discs

Label on the disc

CD-DA

MP3

WMA

AAC

4

........................................................

5

Location of controls and basic operations .......................

6

Connections (CDX-M50IP) ............................................

6

Connections (CDX-MR50IP) ..........................................

8

3-1.

Sub (AUX) Panel Assy .................................................... 11

3-2.

CD Mechanism Block ..................................................... 11

3-3.

MAIN Board .................................................................... 12

3-4.

SERVO Board .................................................................. 12

3-5.

Chassis (T) Sub Assy ....................................................... 13

3-6.

Roller Arm Assy .............................................................. 13

3-7.

Chassis (OP) Assy ........................................................... 14

3-8.

Chucking Arm Sub Assy ................................................. 14

3-9.

Sled Motor Assy .............................................................. 15

3-10. Optical Pick-up Section ................................................... 16
3-11. Optical Pick-up ................................................................ 16

........................................ 17

5-1.

Block Diagram –Main Section– ...................................... 21

5-2.

Block Diagram –Display Section– .................................. 22

5-3.

Printed Wiring Board –Main Section– ............................ 23

5-4.

Schematic Diagram –Main Section (1/4)– ...................... 24

5-5.

Schematic Diagram –Main Section (2/4)– ...................... 25

5-6.

Schematic Diagram –Main Section (3/4)– ...................... 26

5-7.

Schematic Diagram –Main Section (4/4)– ...................... 27

5-8.

Printed Wiring Board –iPod Section– ............................. 28

5-9.

Schematic Diagram –iPod Section– ................................ 28

5-10. Printed Wiring Board –Sub Section– .............................. 29
5-11. Schematic Diagram –Sub Section– ................................. 29
5-12. Printed Wiring Board –Display Section– ........................ 30
5-13. Schematic Diagram –Display Section– ........................... 31

6-1.

Main Section .................................................................... 37

6-2.

Front Panel Section ......................................................... 38

6-3.

CD Mechanism Section (MG-101FC-188//Q) ................ 39

.................................. 40