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Sony HCD-EH25 Service Manual

Sony HCD-EH25
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SERVICE MANUAL
Sony Corporation
Audio Business Group
Published by Sony Techno Create Corporation
HCD-EH25/EH26
SPECIFICATIONS
COMPACT DISC DECK RECEIVER
9-889-152-01
2008E05-1
©
2008.05
AEP Model
HCD-EH25/EH26
UK Model
Russian Model
Korean Model
HCD-EH25
Ver. 1.0 2008.05
HCD-EH25 is the ampli er, USB, CD player,
tape deck and tuner section in CMT-EH25.
HCD-EH26 is the ampli 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-EH10
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
* is 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
Korean model:
531 − 1,602 kHz (with 9 kHz tuning
interval)
530 − 1,610 kHz (with 10 kHz tuning
interval)
Other models:
531 − 1,602 kHz (9 kHz step)
Antenna: AM loop antenna
Intermediate frequency: 450 kHz
General
Power requirements
Korean model: 220 V AC, 60 Hz
Other models: 230 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 specications are subject to
• “WALKMAN” and “WALKMAN” logo are registered
trademarks of Sony Corporation.
• MPEG Layer-3 audio coding technology and patents
licensed from Fraunhofer IIS and omson.
Photo: HCD-EH26
jomi
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Sony HCD-EH25 Specifications

General IconGeneral
TypeMini Hi-Fi System
CD PlayerYes
TunerFM/AM
BluetoothNo
USB PlaybackYes
Number of Discs1
Playable MediaCD, CD-R, CD-RW
Audio formatsMP3
Remote ControlYes
Speaker Type2-way
Preset StationsFM20/AM10

Summary

SPECIFICATIONS

Amplifier section

Details the power output ratings and input/output specifications for the amplifier.

USB section

Lists supported bit rates and sampling frequencies for USB playback.

CD player section

Provides specifications for the CD player system, including laser diode properties.

Tape deck section

Describes the recording system for the tape deck.

Tuner section

Lists tuning ranges and intermediate frequencies for FM and AM tuners.

General

Covers power requirements, consumption, dimensions, and weight of the unit.

SERVICING NOTES

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT

Precautions for handling sensitive optical pick-up components and preventing electrostatic discharge.

NOTES ON LASER DIODE EMISSION CHECK

Guidelines for safely checking laser diode emission from the optical pick-up block.

UNLEADED SOLDER

Information on characteristics and handling of lead-free solder used in the device.

GENERAL

Guide to parts and controls

Identifies and explains the function of the unit's buttons and remote control features.

Information on the display

Explains the various indicators and information displayed on the unit's screen.

DISASSEMBLY

DISASSEMBLY FLOW

Outlines the sequential steps required to disassemble the product for servicing.

REAR CABINET BLOCK

Details the procedure for removing and disassembling the rear cabinet of the unit.

FRONT CABINET BLOCK, TOP CABINET BLOCK, MAIN BOARD

Instructions for disassembling the front and top cabinet sections and accessing the main board.

MF-EH10 (TAPE MECHANISM DECK), CASSETTE LID

Steps for dismantling the tape mechanism deck and the cassette lid.

BASE UNIT BLOCK (BU-K8BD90-WOD)

Procedure for accessing and removing the base unit block, including the CD mechanism.

OPTICAL PICK-UP BLOCK (KSM-213CDP)

Steps to disassemble and remove the optical pick-up block assembly.

TEST MODE

COLD RESET

Procedure to reset the unit to factory default settings, clearing all stored data.

PANEL TEST MODE

Instructions for activating and using the panel test mode to check unit functions.

TUNER STEP CHANGE

Guide for changing the AM tuning interval step between 9 kHz and 10 kHz.

CD SERVICE MODE

Procedure to enter CD service mode for SLED adjustment and laser power control.

CD ERROR CODE

Explanation of error codes displayed for optical pick-up and CD board issues.

MECHANICAL ADJUSTMENTS

Precaution

Safety and handling precautions before performing mechanical adjustments.

Torque Measurement

Specifications and procedures for measuring torque on various mechanical parts.

Tape Tension Measurement

Method for measuring tape tension during playback.

ELECTRICAL ADJUSTMENTS

DECK SECTION

Procedures and settings for deck section adjustments, including azimuth.

TEST TAPE

Specifies the test tape required and its signal characteristics for adjustments.

RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT

Detailed steps for adjusting the azimuth of the record/playback head for optimal performance.

DIAGRAMS

BLOCK DIAGRAM - CD SERVO Section

Illustrates the signal flow and components within the CD servo control system.

BLOCK DIAGRAM - TUNER/USB Section

Shows the block diagram for the tuner and USB interface sections of the device.

BLOCK DIAGRAM - MAIN/POWER SUPPLY Section

Depicts the main control, audio processing, and power supply circuits.

PRINTED WIRING BOARD - CD Board

Shows the component layout on the CD board's component and conductor sides.

SCHEMATIC DIAGRAM - CD Board

Provides the detailed circuit schematic for the CD board.

PRINTED WIRING BOARD - USB Board

Illustrates the component placement on the USB board for both sides.

SCHEMATIC DIAGRAM - USB Board

Presents the complete circuit schematic for the USB interface board.

PRINTED WIRING BOARD - MAIN Board

Component layout diagram for the main circuit board.

SCHEMATIC DIAGRAM - MAIN Board (1/3)

Part one of the main board's schematic diagram, detailing circuit connections.

SCHEMATIC DIAGRAM - MAIN Board (2/3)

Part two of the main board's schematic diagram, illustrating further circuit details.

SCHEMATIC DIAGRAM - MAIN Board (3/3)

The final part of the main board's schematic, completing the circuit overview.

PRINTED WIRING BOARD - PANEL Board

Component layout for the front panel board.

SCHEMATIC DIAGRAM - PANEL Board

Detailed circuit schematic for the front panel interface board.

PRINTED WIRING BOARD - PT-VBUS Board

Component layout for the PT-VBUS board.

SCHEMATIC DIAGRAM - PT-VBUS Board

Circuit schematic for the PT-VBUS power supply board.

IC Block Diagrams

Illustrates the internal block diagrams of key integrated circuits.

IC Pin Function Description

Details the function and I/O of pins for major ICs used in the system.

EXPLODED VIEWS

OVERALL SECTION

An exploded view showing the general assembly of the main unit components.

FRONT CABINET SECTION

Exploded view detailing parts of the front cabinet and associated sub-assemblies.

TOP CABINET SECTION

Exploded view illustrating the components of the top cabinet section.

BASE UNIT SECTION (BU-K8BD90-WOD)

Exploded view of the base unit, including the CD mechanism and optical pick-up.

ELECTRICAL PARTS LIST

CD

List of electrical components for the CD section, including capacitors, ICs, and resistors.

MAIN

Comprehensive list of electrical parts for the main board.

PANEL

List of electrical components used on the panel board.

PANEL PT-VBUS

Electrical parts list for the PT-VBUS board.

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