CMT-EH25, CMT-EH26, HCD-EH25, HCD-EH26 - Sony Audio Service Manual (repair manual)

cmt-eh25, cmt-eh26, hcd-eh25, hcd-eh26 service manual
Model
CMT-EH25 CMT-EH26 HCD-EH25 HCD-EH26
Pages
53
Size
4.35 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
cmt-eh25-cmt-eh26-hcd-eh25-hcd-eh26.pdf
Date

Read Sony CMT-EH25 / CMT-EH26 / HCD-EH25 / HCD-EH26 Service Manual online

SERVICE MANUAL
Sony Corporation
Audio&Video Business Group
Published by Sony Techno Create Corporation
HCD-EH25/EH26
SPECIFICATIONS
COMPACT DISC DECK RECEIVER
9-889-152-07
2010F05-1
© 
2010.06
AEP Model
HCD-EH25/EH26
UK Model
E Model
Australian Model
Russian Model
HCD-EH25
Ver. 1.6  2010.06
•  HCD-EH25 is the amplifi er, USB, CD player, 
tape deck and tuner section in CMT-EH25.
•  HCD-EH26 is the amplifi er, USB, CD player, 
tape deck and tuner section in CMT-EH26.
CD 
Section
Model Name Using Similar Mechanism
NEW
Base Unit Name
BU-K8BD90-WOD
Optical Pick-up Name
KSM-213CDP
TAPE
Section
Model Name Using Similar Mechanism
HCD-EH10
Tape Transport Mechanism Type
MF-EH15
European and Russian models:
Amplifier section
DIN power output (rated): 
4 + 4 watts (4 ohms at 1 kHz, DIN)
Continuous RMS power output 
(reference): 5 + 5 watts (4 ohms at 
1 kHz, 10% THD)
Music power output (reference):
7 + 7 watts (4 ohms at 1 kHz, 10% 
THD)
Other models:
DIN power output (rated):
4 + 4 watts (4 ohms at 1 kHz, DIN)
Continuous RMS power output 
(reference): 5 + 5 watts (4 ohms at 
1 kHz, 10% THD)
Inputs:
AUDIO IN (stereo mini jack): 
voltage 800 mV, impedance 
47 kilohms
 (USB) port: Type A, maximum 
current 500 mA
Outputs:
PHONES (stereo mini jack): accepts 
headphones of 8 ohms or more
SPEAKER: accepts impedance of 
4 ohms
USB section
Supported bit rate
MP3 (MPEG 1 Audio Layer-3): 
32 – 320kbps, VBR
Sampling frequencies
MP3 (MPEG 1 Audio Layer-3): 
32/44.1/48 kHz
CD player section
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
Tape deck section
Recording system: 4-track 2-channel, stereo
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section:
Tuning range:
87.5 − 108.0 MHz (50 kHz step)
Antenna: FM lead antenna
Intermediate frequency: 10.7 MHz
AM tuner section:
Tuning range
European and Russian models:
531  − 1,602 kHz (9 kHz step)
Latin American models:
530  − 1,710 kHz (10 kHz step)
531  − 1,710 kHz (9 kHz step)
Australian model:
530  − 1,710 kHz (10 kHz step)
531  − 1,710 kHz (9 kHz step)
Other models:
531  − 1,602 kHz (9 kHz step)
530  − 1,610 kHz (10 kHz step)
Antenna: AM loop antenna
Intermediate frequency: 450 kHz
General
Power requirements
European and Russian models: 
230 V AC, 50/60 Hz
Korean model:  
220 V AC, 60 Hz
Australian model: 
230  − 240 V AC, 50/60 Hz
Mexican model:  
120 V AC, 60 Hz
Latin American models (except for 
Mexican model): 
110  − 120 V or 220  − 240 V AC, 
50/60 Hz, adjustable with voltage 
selector
Other models:  
220  − 240 V AC, 50/60 Hz
Power consumption: 27 watts
Dimensions (w/h/d) (excl. speakers): 
Approx. 155 × 241 × 224.6 mm
Mass (excl. speakers): Approx. 2.2 kg
change without notice.
Design and specifications are subject to
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Photo: HCD-EH26
HCD-EH25/EH26
2
1. 
SERVICING  NOTES
  .............................................   3
2. GENERAL
  ..................................................................   4
3. DISASSEMBLY
3-1. Disassembly 
Flow 
...........................................................   5
3-2.  Rear Cabinet Block .........................................................   5
3-3.  Front Cabinet Block, Top Cabinet Block, 
 MAIN 
Board 
...................................................................  
6
3-4.  MF-EH15 (Tape Mechanism Deck), Cassette Lid ..........   6
3-5.  Base Unit Block (BU-K8BD90-WOD) ..........................   7
3-6.  Optical Pick-up Block (KSM-213CDP) .........................   7
4. 
TEST  MODE 
 ............................................................  
8
5. MECHANICAL 
 
ADJUSTMENTS 
 ......................  
9
6. ELECTRICAL 
 
ADJUSTMENTS 
 ........................  
9
7. DIAGRAMS
7-1.  Block Diagram - CD SERVO Section - ..........................   12
7-2.  Block Diagram - TUNER/USB Section - .......................   13
7-3.  Block Diagram - MAIN/POWER SUPPLY Section - ....   14
7-4.  Printed Wiring Board - CD Board - ................................   16
7-5.  Schematic Diagram - CD Board - ...................................   17
7-6.  Printed Wiring Board - USB Board - ..............................   18
7-7.  Schematic Diagram - USB Board - .................................   19
7-8.  Printed Wiring Board - MAIN Board - ...........................   20
7-9.  Schematic Diagram - MAIN Board (1/3) - .....................   21
7-10.  Schematic Diagram - MAIN Board (2/3) - .....................   22
7-11.  Schematic Diagram - MAIN Board (3/3) - .....................   23
7-12.  Printed Wiring Board - PANEL Board - .........................   24
7-13.  Schematic Diagram - PANEL Board - ............................   25
7-14. Printed Wiring Board 
- PT-VBUS Board (Except EH25: E2, E51) - .................   26
7-15. Printed Wiring Boards 
- PT-VBUS Section (EH25: E2, E51) -...........................   26
7-16.  Schematic Diagram - PT-VBUS Section - ......................   26
8. 
EXPLODED  VIEWS
8-1. Overall 
Section 
...............................................................  27
8-2.  Front Cabinet Section .....................................................   28
8-3.  Top Cabinet Section ........................................................   29
8-4.  Base Unit Section (BU-K8BD90-WOD) ........................   30
9. 
ELECTRICAL  PARTS  LIST
  ..............................   43
Accessories are given in the last of the electrical parts list.
TABLE  OF  CONTENTS
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.
SAFETY-RELATED  COMPONENT  WARNING!
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 
 
WHOSE  PART  NUMBERS  APPEAR  AS  SHOWN  IN  THIS  
MANUAL  OR  IN  SUPPLEMENTS  PUBLISHED  BY  SONY.
CAUTION
Use of controls or adjustments or performance of procedures 
other than those specifi ed herein may result in hazardous radia-
tion exposure.
This appliance is classifi ed as 
a CLASS 1 LASER product.
This marking is located on the 
rear exterior.
Ver. 1.5
• Abbreviation
  E2 
: Colombian model
  E51 
: Chilean and Peruvian models
HCD-EH25/EH26
3
SECTION  1
SERVICING  NOTES
Model
POWER  VOLTAGE  INDICATION
EH25: AEP, UK, Russian 
models/EH26
AC 230 V, 50/60 Hz
EH25: Australian model
AC 230 – 240 V, 50/60 Hz
EH25: Mexican model
AC 120 V, 60 Hz
EH25: Colombian, Chilean 
and Peruvian models
AC 110 – 120 V or 220 – 240 V, 
50/60 Hz
EH25: Singapore and 
Indian models
AC 220 – 240 V, 50/60 Hz
EH25: Korean model
AC 220 V, 60 Hz
MODEL  IDENTIFICATION
LASER  DIODE  AND  FOCUS  SEARCH  OPERATION  
CHECK
During normal operation of the equipment, emission of the laser 
diode is prohibited unless the upper lid is closed while turning on 
the SW750. (push switch type)
The following checking method for the laser diode is operable.
• Method
  Emission of the laser diode is visually checked.
1.  Open the upper lid.
2.  Push the SW750 as shown in Fig.1.
  Note: Do not push the detection lever strongly, or it may be bent or dam-
aged.
3.  Check the object lens for confi rming normal emission of the 
laser diode. If not emitting, there is a trouble in the auto-
matic power control circuit or the optical pick-up.
 
In this operation, the object lens will move up and down 2 
times along with inward motion for the focus search.
SW750
Fig. 1.  Method to push the SW750
Power Voltage
Indication
– Rear Cabinet –
Ver. 1.6
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 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.
NOTES  ON  HANDLING  THE OPTICAL  PICK-UP  
BLOCK  OR  BASE  UNIT
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.
HCD-EH25/EH26
4
SECTION  2
GENERAL
This section is extracted 
from instruction manual.
Guide to parts and controls
also be performed using the buttons on the unit having the same or similar names.
This manual mainly explains operations using the remote, but the same operations can
Unit
Remote
/ (power) button
Press to turn on the system.
/ (go back/go forward)
button
Unit: TUNING +/− (tuning) 
button
Remote: +/− (tuning) button
Press to tune in the desired station.
Press to find a point in a track or file.
Press to select a track or file.
/ (rewind/fast forward)
button
 +/−  (select folder) button
Press to select a folder.
Sound buttons
Unit: DSGX button
Remote: EQ button
Press to select the sound effect.
Remote sensor
Playback buttons and function
buttons
Unit: USB  (play/pause)
button
Press to select the USB function.
Press to start or pause playback of an
optional USB device.
Remote: USB button
Press to select the USB function.
Unit: CD  (play/pause)
button
Press to select the CD function.
Press to start or pause playback of a disc.
Remote: CD button
Press to select the CD function.
RH
RI
RK
RL
RM
X
XB
XT
XE
R
RB
RT
RE
RG
Remote:  (play) button,
 (pause) button
Press to start or pause playback.
TUNER/BAND button
Press to select the TUNER function.
Press to select FM or AM reception
mode.
FUNCTION button
Press to select the function.
 (stop) button
Press to stop playback.
 (USB) port
Connect to an optional USB device.
Unit: VOLUME control
Remote: VOLUME +/− button
Turn or press to adjust the volume.
 (record) button,  (play)
button, / (rewind/fast
forward) button,   (stop/
eject) button,  (pause) button
Press to operate the tape functions.
PHONES jack
Connect the headphones.
AUDIO IN jack
Connect to an optional audio
component.
Lights up when the system is turned off.
STANDBY indicator
CLOCK/TIMER SELECT button
CLOCK/TIMER SET button
Press to set the clock and the Play Timer.
REPEAT/FM MODE button
Press to listen to a disc or USB device
repeatedly. Or press to listen to a single
track/file or all tracks/file in a folder (for
USB devices only) repeatedly.
Press to select the FM reception mode
(monaural or stereo).
ENTER button
Press to enter the settings.
Information on the display
Timer
Text information
Play mode
DSGX
Tuner reception mode
Tuner reception
Audio format
Play/Pause
Battery compartment lid 
CLEAR button
Press to delete a pre-programmed track
file.
TUNER MEMORY button
Press to preset the radio station.
PLAY MODE/TUNING MODE 
button
Press to select the play mode of a CD or
MP3 disc.
Press to select the tuning mode.
DISPLAY button
Press to change the  information on the
display.
SLEEP button
Press to set the Sleep Timer.
 PUSH OPEN/CLOSE
Press to open or close the CD 
compartment.
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Here you can read online and download Sony CMT-EH25 / CMT-EH26 / HCD-EH25 / HCD-EH26 Service Manual in PDF. CMT-EH25 / CMT-EH26 / HCD-EH25 / HCD-EH26 service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sony CMT-EH25 / CMT-EH26 / HCD-EH25 / HCD-EH26 Audio. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.