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2013B33-1

© 

2013.02

•  HCD-MX500i is the amplifi er, CD player, tuner, USB (Except US, Canadian) and iPod/iPhone section in CMT-MX500i.
•  HCD-MX550i is the amplifi er, CD player, tuner, USB and iPod/iPhone section in CMT-MX550i.

Model Name Using Similar Mechanism

NEW

CD Mechanism Type

CDM85CD-DVBU102

Optical Pick-up Block Name

KHM-313CAA

AU
POWER OUTPUT AND TOTAL HARMONIC DISTORTION.
(The United States model only)

DIO POWER SPECIFICATIONS

With 6 ohm loads, both channels driven, from 120   10,000 Hz; rated 30 watts 
per channel minimum RMS power, with no more than 10% total harmonic 
distortion from 250 milliwatts to rated output.

European model:

DIN power output (rated): 25 watts + 25 watts (6 ohms at 1 kHz, DIN)
Continuous RMS power output (reference): 30 watts + 30 watts (6 ohms at 
1 kHz, 10% THD)
Music power output (reference): 30 watts + 30 watts (6 ohms at 1 kHz, 10% 
THD)

Other models:

DIN power output (rated): 25 watts + 25 watts (6 ohms at 1 kHz, DIN)
Continuous RMS power output (reference): 30 watts + 30 watts (6 ohms at 
1 kHz, 10% THD)

AUDIO IN (stereo mini jack): Sensitivity 700 mV, impedance 47 kilohms

SPEAKERS: Accepts impedance of 6 ohms

System: Compact disc and digital audio system
Laser Diode Properties

Emission Duration: Continuous
Laser Output*: Less than 44.6μW
* This output is the value measurement at a distance of 200mm from the 

objective lens surface on the Optical Pick-up Block with 7mm aperture.

Frequency response: 20 Hz   20 kHz
Signal-to-noise ratio: More than 90 dB
Dynamic range: More than 90 dB

FM tuner section:

FM stereo, FM superheterodyne tuner
Tuning range:

North American model: 87.5 MHz 

 108.0 MHz (100 kHz step)

Other models: 87.5 MHz   108.0 MHz (50 kHz step)

Antenna: FM lead antenna
Antenna terminals: 75 ohms unbalanced
Intermediate frequency: 10.7 MHz

DAB/DAB+ tuner section ( MX550i only):

FM stereo, DAB/FM superheterodyne tuner
Frequency range*
Band-III: 174.928 (5A) MHz   239.200 (13F) MHz
* For details, see “DAB/DAB+ frequency table” below.
Antenna: DAB/FM lead antenna
Antenna terminal: 75 ohms, F female

DAB/DAB+ frequency table (Band-III)

174.928 MHz

5A

209.936 MHz

10A

176.640 MHz

5B

211.648 MHz

10B

178.352 MHz

5C

213.360 MHz

10C

180.064 MHz

5D

215.072 MHz

10D

181.936 MHz

6A

216.928 MHz

11A

183.648 MHz

6B

218.640 MHz

11B

185.360 MHz

6C

220.352 MHz

11C

187.072 MHz

6D

222.064 MHz

11D

188.928 MHz

7A

223.936 MHz

12A

190.640 MHz

7B

225.648 MHz

12B

192.352 MHz

7C

227.360 MHz

12C

194.064 MHz

7D

229.072 MHz

12D

195.936 MHz

8A

230.784 MHz

13A

197.648 MHz

8B

232.496 MHz

13B

199.360 MHz

8C

234.208 MHz

13C

201.072 MHz

8D

235.776 MHz

13D

202.928 MHz

9A

237.488 MHz

13E

204.640 MHz

9B

239.200 MHz

13F

206.352 MHz

9C

208.064 MHz

9D

* Frequencies are displayed to two decimal places on this system.

Compatible iPod/iPhone models:

 iPod touch 2nd generation
 iPod touch 1st generation
 iPod classic 120 GB, 160 GB (2009)
 iPod classic 160 GB (2007)
 iPod classic 80 GB
 iPod nano 5th generation (video camera) 
 iPod nano 4th generation (video) 
 iPod nano 3rd generation (video) 
 iPod nano 2nd generation (aluminum) 
 iPod nano 1st generation
 iPod  5th  generation  (video)
 iPod  4th  generation  (color  display) 
 iPod  4th  generation

iPod mini
iPhone
iPhone 3G
iPhone 3GS

Supported bit rate:

MP3 (MPEG 1 Audio Layer-3): 32 kbps   320 kbps, VBR
WMA: 48 kbps   192 kbps, VBR
AAC: 48 kbps   320 kbps

Sampling frequencies:

MP3 (MPEG 1 Audio Layer-3): 32/44.1/48 kHz
WMA: 44.1 kHz
AAC: 44.1 kHz

 (USB) port: Type A, maximum current 500 mA

Power requirements:

North American model: AC 120 V, 60 Hz
Other models: AC 220 V   240 V, 50/60 Hz

Power consumption: 33 watts
Dimensions (W/H/D) (excl. speakers): 

Approx. 309 mm × 122 mm × 247 mm

Mass (excl. speakers): Approx. 2.9 kg

Design and specifications are subject to change without notice.

 Standby power consumption: 0.5 W
 Halogenated  flame  retardants are not used in the certain printed 

wiring boards.

•  iPod is a trademark of Apple Inc., registered in the U.S. and other countries.
•  iPhone is a trademark of Apple Inc.
•  MPEG Layer-3 audio coding technology and patents licensed from Fraunhofer IIS and Thomson.
•  Windows Media is either a registered trademark or trademark of Microsoft Corporation in the 

United States and/or other countries.

•  This product is protected by certain intellectual property rights of Microsoft Corporation. Use or 

distribution of such technology outside of this product is prohibited without a license from Micro-
soft or an authorized Microsoft subsidiary.

•  All other trademarks and registered trademarks are of their respective holders. In this manual, ™ 

and ® marks are not specifi ed.

Photo: HCD-MX550i

NOTES  ON  CHIP  COMPONENT  REPLACEMENT
•  Never reuse a disconnected chip component.
•  Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

FLEXIBLE  CIRCUIT  BOARD  REPAIRING
•  Keep the temperature of soldering iron around 270 °C during 

repairing.

•  Do not touch the soldering iron on the same conductor of the 

circuit board (within 3 times).

•  Be careful not to apply force on the conductor when soldering 

or unsoldering.

0  OR  DOTTED  LINE  

0  ON  THE  SCHEMATIC  DIAGRAMS  AND  IN  

0  SUR  

Laser component in this product is capable of emitting radiation 
exceeding the limit for Class 1.

This appliance is classifi ed as 
a CLASS 1 LASER product.
This marking is located on the 
rear or bottom exterior.

SAFETY  CHECK-OUT
After correcting the original service problem, perform the follow-
ing safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, 
screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.

LEAKAGE  TEST
The AC leakage from any exposed metal part to earth ground and 
from all exposed metal parts to any exposed metal part having a 
return to chassis, must not exceed 0.5 mA (500 microamperes.). 
Leakage current can be measured by any one of three methods.
1.  A commercial leakage tester, such as the Simpson 229 or RCA 

WT-540A. Follow the manufacturers’ instructions to use these 
instruments.

2.  A battery-operated AC milliammeter. The Data Precision 245 

digital multimeter is suitable for this job.

3.  Measuring the voltage drop across a resistor by means of a 

VOM or battery-operated AC voltmeter. The “limit” indication 
is 0.75 V, so analog meters must have an accurate low-voltage 
scale. The Simpson 250 and Sanwa SH-63Trd are examples 
of a passive VOM that is suitable. Nearly all battery operated 
digital multimeters that have a 2 V AC range are suitable. (See 
Fig. A)

  .............................................   4

2-1.   Disassembly Flow ...........................................................   9
2-2. Case 

.................................................................................   9

2-3.   Front Panel Block ...........................................................   10
2-4.   Knob (VOL) ....................................................................   11
2-5.   MAIN Board ...................................................................   11
2-6.   SP Board .........................................................................   12
2-7.   POWER Board ................................................................   12
2-8.   CD Block ........................................................................   13
2-9.   BD96/BD96U Board .......................................................   14
2-10.  Belt ..................................................................................   14
2-11.  FFC Holder .....................................................................   15
2-11.  Optical Pick-up Block (KHM-313CAA) ........................   15

TEST  MODE 

 ............................................................   16

ELECTRICAL  CHECK 

 .........................................   19

5-1.  Block Diagram - CD, USB Section - ..............................   21
5-2. Block 

Diagram 

- TUNER, iPod/iPhone, AUDIO IN Section - ................   22

5-3.  Block Diagram - OUTPUT, PANEL Section - ...............   23
5-4.  Block Diagram - POWER SUPPLY Section - ................   24
5-5. Printed 

Wiring 

Board 

- BD96/BD96U Board (Side A) - ...................................   26

5-6. Printed 

Wiring 

Board 

- BD96/BD96U Board (Side B) - ...................................   27

5-7.  Schematic Diagram - BD96/BD96U Board (1/2) - ........   28
5-8.  Schematic Diagram - BD96/BD96U Board (2/2) - ........   29
5-9.  Printed Wiring Board - DAB Board (MX550i) - ............   30
5-10.  Schematic Diagram - DAB Board (MX550i) - ...............   31
5-11.  Printed Wiring Board - MAIN Section (1/2) - ................   32
5-12.  Printed Wiring Boards - MAIN Section (2/2) - ..............   33
5-13.  Schematic Diagram - MAIN Section (1/4) - ...................   34
5-14.  Schematic Diagram - MAIN Section (2/4) - ...................   35
5-15.  Schematic Diagram - MAIN Section (3/4) - ...................   36
5-16.  Schematic Diagram - MAIN Section (4/4) - ...................   37
5-17.  Printed Wiring Boards - IP/JACK/SP/USB Boards - .....   38
5-18.  Schematic Diagram - IP/JACK/SP/USB Boards - ..........   39
5-19.  Printed Wiring Boards - PANEL Section - .....................   40
5-20.  Schematic Diagram - PANEL Section - ..........................   41
5-21.  Printed Wiring Board - POWER Board - ........................   42
5-22.  Schematic Diagram - POWER Board - ..........................   43

6-1. Case 

Section 

....................................................................  56

6-2.  Front Panel Section .........................................................   57
6-3.  iPod Dock Section ..........................................................   58
6-4.  MAIN Board Section ......................................................   59
6-5. Chassis 

Section 

...............................................................  60

6-6.  CD Mechanism Deck Section
 (CDM85CD-DVBU102) 

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

61

  ..............................   62

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)

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 fl 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.

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

NOTES  ON  LASER  DIODE  EMISSION  CHECK
The laser beam on this model is concentrated so as to be focused 
on the disc refl ective surface by the objective lens in the optical 
pickup block. Therefore, when checking the laser diode emission, 
observe from more than 30 cm away from the objective lens.

NOTE  OF  REPLACING  THE  MS-203  BOARD
When the MS-203 board is damaged, exchange the entire 
CDM85 (CD) ASSY.

HCD-MX500i: AEP model

4-175-955-0

[]

HCD-MX500i: US model

4-175-955-1

[]

HCD-MX500i: Canadian model

4-175-955-2

[]

HCD-MX500i: Singapore model

4-175-955-3

[]

HCD-MX500i: Chinese model

4-175-955-4

[]

HCD-MX550i: AEP, UK models

4-175-955-5

[]

RELEASING  THE  DISC  TRAY  LOCK
The disc tray lock function for the antitheft of an demonstration 
disc in the store is equipped.

Releasing Procedure:
1.  Press the [

?/1

] button to turn the power on.

2.  Press two buttons of [

x

] and [

Z

] for 5 seconds.

3.  The message “UNLOCKED” is displayed on the fl uorescent 

indicator tube and the disc tray is unlocked.

Note: When “LOCKED”is displayed, the disc tray lock is not released by 

turning power on/off with the [

?/1] button.