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2008C05-1

© 

2008.03

•  HCD-SPZ55 is the amplifi er, CD player, tape 

deck and tuner section in CMT-SPZ55.

CD Section

Model Name Using Similar Mechanism

HCD-SPZ50

CD Mechanism Name

DLM3A

Base Unit Name

BU-K6BD83S-WOD

Optical Pick-up Block Name

KSM-213DCP

TAPE Section

Model Name Using Similar Mechanism

HCD-SPZ50

Tape Transport Mechanism Name

CFP42601

The following are measured at AC 220 – 240 V, 50/60 Hz

DIN power output (rated): 30 + 30 W (6 ohms at 1 kHz, DIN)
Continuous RMS power output (reference): 40 + 40 W (6 ohms at 1 kHz, 
10% THD)

Inputs

AUDIO IN: Sensitivity 250 mV, impedance 47 kilohms

Outputs

PHONES: Accepts headphones with an impedance of 8 ohms or more
SPEAKER: 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 200 mm from the 

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

Frequency response: 20 Hz – 20 kHz (±2 dB)
Wavelength: 780 – 790 nm

Recording system: 4-track 2-channel, stereo
Frequency response: 50 – 13,000 Hz (±3 dB), using Sony TYPE I cassettes
Wow and flutter: ±0.15% W. Peak (IEC)

0.1% W. RMS (NAB)
±0.2% W. Peak (DIN)

FM stereo, FM/AM superheterodyne tuner
FM tuner section:

Tuning range: 87.5 – 108.0 MHz
Antenna: FM lead antenna
Antenna terminals: 75 ohms unbalanced
Intermediate frequency: 10.7 MHz

AM tuner section:

530 – 1,710 kHz (with 10 kHz tuning interval)
531 – 1,602 kHz (with 9 kHz tuning interval)
Antenna: AM loop antenna
Antenna terminals: External antenna terminal
Intermediate frequency: 450 kHz

Power requirements

220 – 240 V AC, 50/60 Hz

Power consumption:

40 watts

Dimensions (w/h/d) (excl. speakers): Approx. 180 × 280 × 338 mm
Mass (excl. speakers): Approx. 4.1 kg

Design and specifications are subject to change without notice.

U.S. and foreign patents licensed from Dolby 
Laboratories.

  .............................................   3

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

3-1. Disassembly 

Flow 

...........................................................   6

3-2. Case 

.................................................................................   6

3-3. Front 

Panel 

Assy 

.............................................................   7

3-4.  Tape Mechanism Deck (CFP42601) ...............................   7
3-5. MAIN 

Board 

...................................................................   8

3-6.  Base Unit (BU-K6BD83S-WOD Assy)/
 Belt 

(DLM3A) 

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

8

3-7. AMP/SP/POWER 

Board 

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

3-8. Tuner 

(FM/AM) 

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

TEST  MODE 

 ............................................................   10

ADJUSTMENTS 

 ......................   12

ADJUSTMENTS 

 ........................   12

7-1.  Block Diagram - CD SERVO Section - ..........................   15
7-2.  Block Diagram - MAIN Section - ...................................   16
7-3.  Block Diagram - AMP Section - .....................................   17
7-4. Block 

Diagram 

 

- PANEL, POWER SUPPLY Section - ...........................   18

7-5.  Printed Wiring Board - CD Board - ................................   20
7-6.  Schematic Diagram - CD Board - ...................................   21
7-7.  Printed Wiring Board - TC Board - .................................   22
7-8.  Schematic Diagram - TC Board - ...................................   23
7-9.  Printed Wiring Board - MAIN Board - ...........................   24
7-10.  Schematic Diagram - MAIN Board (1/3) - .....................   25
7-11.  Schematic Diagram - MAIN Board (2/3) - .....................   26
7-12.  Schematic Diagram - MAIN Board (3/3) - .....................   27
7-13.  Printed Wiring Board - AMP Board - .............................   28
7-14.  Schematic Diagram - AMP Board - ................................   29
7-15.  Printed Wiring Board - PANEL Section (1/2) - ..............   30
7-16.  Printed Wiring Boards - PANEL Section (2/2) - .............   31
7-17.  Schematic Diagram - PANEL Section (1/2) - .................   32
7-18.  Schematic Diagram - PANEL Section (2/2) - .................   33
7-19.  Printed Wiring Board - POWER Board - ........................   34
7-20.  Schematic Diagram - POWER Board - ..........................   35

8-1. Overall 

Section 

...............................................................  49

8-2.  Front Panel Section .........................................................   50
8-3. FL 

Section 

.......................................................................  51

8-4. CD 

Section 

......................................................................  52

8-5. Power 

Section 

.................................................................  53

  ..............................   54

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.

This appliance is 
classified as a CLASS 1
LASER product. This
marking is located on the 
rear exterior.

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

COMPONENTS  IDENTIFIED  BY  MARK 0 OR  DOTTED  LINE  
WITH  MARK 0 ON  THE  SCHEMATIC  DIAGRAMS  AND  IN  
THE  PARTS  LIST  ARE  CRITICAL  TO  SAFE  OPERATION.
REPLACE  THESE  COMPONENTS  WITH  SONY  PARTS 

The laser diode in the optical pick-up block may suffer electrostat-
ic 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.

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 viscou-s (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.

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 

[I/

1

] button to turn the power on.

2.  While pressing the [

x

] button, press the [

Z

] button until “UN-

LOCKED” displayed on the fl uorescent indicator tube (around 
5 seconds).

Note: When 

“

LOCKED

”

 is displayed, the antitheft lock is not released 

by turning power on/off with the

 [I/1]

 button.

This section is extracted 
from instruction manual.

Slide and remove the battery compartment lid , XM and 
insert the two supplied R6 (size AA) batteries, 

 side 

first, matching the polarities shown below.

• With normal use, the batteries should last for about six months.
• Do not mix an old battery with a new one or mix different types of 

batteries.

• If you do not use the remote for a long period of time, remove the 

batteries to avoid damage from battery leakage and corrosion.

Turn on the system.
Press

 (power) .

Select the clock set mode.
Press CLOCK/TIMER SET XL on the remote. If the 
current mode appears on the display, press 

/

 on the remote repeatedly to select “CLOCK SET” 
and then press ENTER RE on the remote.

Set the time.
Press

/  on the remote repeatedly to set 

the hour, and then press ENTER RE on the remote.
Use the same procedure to set the minute.
The clock settings are lost when you disconnect the 
power cord or if a power failure occurs.

Press the following buttons (or press FUNCTION 



repeatedly).

CD

CD

 on the remote.

Tuner

TUNER/BAND

.

Tape

TAPE

 on the remote.

Component (connected 
using an audio cord)

FUNCTION

 repeatedly 

until “AUDIO IN” appears.

Press VOLUME +/– on the remote (or turn the 
VOLUME control on the unit) 

.

Generate a more dynamic
sound (Dynamic Sound 
Generator X-tra)

DSGX XK on the unit.

Generate a clearer sound 
(CMT-SPZ70 only)

SOURCE DIRECT XI on 
the unit.

Set the sound effect

EQ XI repeatedly to select 
“BASS” or “TREBLE,” and 
then press +/– 

 on the 

remote (or EQ LEVEL +/– 
XH on the unit (CMT-SPZ50
only)) repeatedly to adjust 
the level. Or, turn BASS or 
TREBLE controls XH on the 
unit (CMT-SPZ70 only).

Notes on sound effects
• The bass and treble settings and DSGX do not function when 

Source Direct is on.

• Source Direct does not function when the headphones are 

connected.

Select the CD function.
Press CD 

 on the remote.

Place a disc.
Press

 (CD open/close)  on the unit, and place a 

disc with the label side up on the disc tray.

To insert additional discs, slide the disc tray with your 
finger as shown below.

To close the disc tray, press 

 (CD open/close)  on 

the unit again.
Do not force the disc tray closed with your finger, as 
this may damage the unit.

Start playback.
Press

 (play) FB on the remote (or CD/ (play/

pause)

 on the unit).

Pause playback

 (pause) FB on the remote (or 

CD/

 (play/pause)  on the 

unit). To resume play, press the 
button again.

Stop playback

 (stop) .

Select a folder on an 
MP3 disc

 +/– (select folder) 

. Or 

turn the jog dial 

 on the unit 

and press PUSH ENTER 

 on 

the unit (turn the jog dial 

 on 

the unit during playback until 
“GROUP” appears, and then 
press PUSH ENTER 

 on the 

unit to select the desired folder).

Select a track or file

/ (go back/go forward)

. Or turn the jog dial  on 

the unit and press PUSH ENTER 
 on the unit. To cancel, press 

CANCEL

 on the unit.

Find a point in a 
track or file

Hold down

/ (rewind/fast

forward)

 during playback, 

and release the button at the 
desired point.

Select Repeat Play

REPEAT

 repeatedly until 

“REP” or “REP1” appears.

Select a disc

Press DISC SKIP 

 on the 

remote (or DISC 1 – 3 

 or 

DISC SKIP 

 (in stop mode) on 

the unit).

Switch to CD 
function from 
another source

Press DISC 1 – 3 

 on the unit 

(Automatic Source Selection).

Exchange other 
discs while playing

Press EX-CHANGE 

 on the 

unit.

Press PLAY MODE 

 repeatedly while the player is 

stopped. You can select normal play (“ALL DISCS” for 
all discs, “1DISC” for a disc, or “

*” for all MP3 files 

in the folder on the disc), shuffle play (“ALL DISCS 
SHUF,” “1DISC SHUF,” or “

 SHUF*”), or program 

play (“PGM”).

* When playing a CD-DA disc, 

 (SHUF) Play performs the same 

operation as 1DISC (SHUF) Play.

Note on the jog dial
Only the first 6 characters are displayed when performing the folder 
search, track search, or file search.

Notes on Repeat Play
• All tracks or files on a disc are played repeatedly up to five times. 
• You cannot select “REP” and “ALL DISCS SHUF” at the same 

time.

• “REP 1” indicates that a single track or file is repeated until you 

stop it.

Notes on playing MP3 discs
• Do not save other types of files or unnecessary folders on a disc that 

has MP3 files.

• Folders that have no MP3 files are skipped.
• MP3 files are played back in the order that they are recorded onto 

the disc.

• The system can only play MP3 files that have a file extension of 

“.MP3.”

• If there are files on the disc that have the “.MP3” file extension,

but that are not MP3 files, the unit may produce noise or may 
malfunction.

• The maximum number of:

– folders is 255 (including the root folder).
– MP3 files is 511.
– MP3 files and folders that can be contained on a single disc is 512.
– folder levels (the tree structure of files) is 8.

• Compatibility with all MP3 encoding/writing software, recording 

device, and recording media cannot be guaranteed. Incompatible 
MP3 discs may produce noise or interrupted audio or may not play 
at all.

Notes on playing multisession discs
• If the disc begins with a CD-DA (or MP3) session, it is recognized 

as a CD-DA (or MP3) disc, and other sessions are not played back.

• A disc with a mixed CD format is recognized as a CD-DA (audio) 

disc.

Select “FM” or “AM.”
Press TUNER/BAND

 repeatedly.

Select the tuning mode.
Press TUNING MODE 

 repeatedly until “AUTO”

appears.

Tune in the desired station.
Press +/– on the remote (or TUNING +/– on the unit) 

. Scanning stops automatically when a station is 
tuned in, and then “TUNED” and “STEREO” (for 
stereo programs) appear. When you tune in a station 
that provides RDS services, the station name appears 
on the display (European model only).

Press

 (stop) .

If “TUNED” does not appear and the scanning does 
not stop, press TUNING MODE 

 repeatedly until 

“AUTO” and “PRESET” disappear, and then press 
+/– on the remote (or TUNING +/– on the unit) 



repeatedly to tune in the desired station.

Press FM MODE 

 repeatedly until “MONO” appears 

to turn off stereo reception.

Select the tape function.
Press TAPE

 on the remote.

Insert a tape.
Press

 PUSH OPEN/CLOSE  on the unit, and 

insert the TYPE I (normal) tape into the cassette 
holder with the side you want to play facing forward.
Make sure there is no slack in the tape to avoid
damaging the tape or the tape deck. Press 

 PUSH 

OPEN/CLOSE  on the unit again to close the 
cassette holder.

Start playback.
Press

 (play) FB on the remote (or TAPE/ 

(play/pause)

 on the unit). 

Pause playback

 (pause) FB on the remote (or 

TAPE/

 (play/pause)  on 

the unit). To resume play, press the 
button again.

Stop playback

 (stop) .

Rewind or fast
forward

/ (rewind/fast forward) .

  

RB

RE

RT

R

RL

RG

RK

RI

RH

RM

X

XE

XG

XH

XI

XK

XB

XT

FE

XL

XB

FT
XT

FB

RE
RI

F

XI

XG

XM

RB

Information on 
the display*

DISPLAY

 repeatedly when the 

system is on.

Display mode
(See below.)

DISPLAY

 repeatedly when the 

system is off.

* For example, you can view CD/MP3 disc information, such as the 

track or file number or folder name during normal play, or the total 
play time while the player is stopped.

The system offers the following display modes.

Clock

The clock is displayed.

Power Saving 
Mode

2)

The display is turned off to conserve
power. The timer and clock continue 
to operate.

1)

The STANDBY indicator lights up when the system is off.

2)

When the system is in Power Saving Mode, the following functions 
are unavailable:
– setting the clock.
– changing the AM tuning interval
– changing the CD power manage function

Notes on the display information
• The following are not displayed;

– total playing time for a CD-DA disc depending on the play mode.
– total playing time for an MP3 disc.
– remaining playing time for an MP3 file.

• The following are not displayed correctly;

– elapsed playing time of an MP3 file encoded using a VBR

(variable bit rate).

– folder and file names that do not follow either the ISO9660 Level

1, Level 2 or Joliet in the expansion format.

• The following are displayed;

– ID3 tag information for MP3 files when ID3 version 1 and version

2 tags are used. (The Russian model can display information 
in Russian characters, but the characters may not be displayed 
correctly for discs created with some encoding/writing software
and some recording device.)

– up to 62 characters of ID3 tag information using uppercase letters 

(A to Z), numbers (0 to 9), and symbols (" $ % ’ ( ) * + , – . / < = 
> @ [ \ ] _ ` { | } ! ? ^).

Connect headphones to the PHONES jack 

 on the 

unit.

Connect additional audio component to the AUDIO
IN jack 

 on the unit using an audio analog cord (not 

supplied). Turn down the volume on the system, and then 
press FUNCTION  repeatedly to select the AUDIO IN 
function.

Use buttons on the remote to create your own program.

Press CD 

 to select the CD function.

Press PLAY MODE 

 repeatedly until “PGM”

appears while the player is stopped.

Press DISC SKIP 

 to select a disc.

Press

/  repeatedly or turn the jog 

dial

 on the unit until the desired track number

appears.
When programming MP3 files, press 

 +/– (select 

folder)

 repeatedly or turn the jog dial  on the 

unit to select the desired folder, and then select the 
desired file.

Current disc

Loaded disc

Press ENTER RE to add the track or file to the 

program.
“– –.– –” appears when the total time exceeds 100 
minutes for a disc, or when you select a CD track 
whose number is 21 or over, or when you select an 
MP3 file.

Repeat steps 4 through 5 to program additional 

tracks or files, up to a total of 25 tracks or files.

To play your program of tracks or files, press 



(play) FB.
The program remains available until you open the disc
tray. To play the same program again, select the CD 
function, and press 

 (play) FB.

Press PLAY MODE 

 repeatedly until “PGM” 

disappears while the player is stopped.

Press CLEAR F while the player is stopped.

Press DISPLAY

 repeatedly.

Tip
You can program additional tracks or files during playback by using 
the jog dial.

Selected track 
or file number

Total playing time of program 
(including selected track or file)