IC Block Diagrams, BD MD Board 1/2 IC101 CXA2523AR

6-26. IC BLOCK DIAGRAMS

• BD (MD) Board (1/2)

IC101 CXA2523AR

MORFO

MORFI

RFO

OPN

OPO

ADDC

COMPP

COMPO

AGCI

RF AGC

RF

PEAK

48

47

46

45

44

43

42

41

40

39

38

37

USROP

–

+

RF AGC

EQ

+

–

RFA1

USRC

DET

EQ

+ –

RFA2

BPF3T

I

1

–

PEAK3T

1

HLPT

–1

3T

–

P-P

–

2

–2

J

2

–

CFST

PTGR

3T

WBL

TEMP

PEAK

–

1

–2

CVB

–

BOTTOM

36

BOTM

–

2

–1

VC

3

+

GRV

PBH

–

GRVA

WBL

35

ABCD

+

34

FE

A

4

33

AUX

+

IVR

–

AA

+

BPFC

+

ABCDA

32

ADFG

B

5

+

31

ADAGC

IVR

–

BB

+

30

ADIN

–

FEA

–

C

6

+

IVR

–

CC

DET

BPF22

–

ADIP

–

WBL

29

ADFM

+

ATA

AGC

D

7

+

IVR

–

DD

WBL

–1

TG

SE

–

PTGR

–2

28

E

8

+

SEA

+

EE'

IVR

–

EE

+

27

CSLED

–

EFB

+

TESW

–1

TG

TE

–2

26

TEA

F

9

+

IVR

–

FF

WBL

–

FF'

3T

VI CONV

25

WBLADJ

GSW IV

FBAL

EQ

PD

10

AUXSW

BGR

+ –

COMMAND

+ –

SCRI - PARA

VREF

APC

11

DECODE

APCREF

12

13

14

15

16

17

18

19

20

21

22

23

24

GND

TEMPI

TEMPR

SWDT

SCLK

XLAT

XSTBY

F0CNT

VREF

EQADJ

3TADJ

VCC

65

Page 65

Image 65

Sony HCD-MD373 service manual IC Block Diagrams, BD MD Board 1/2 IC101 CXA2523AR

HCD-MD373 specifications

The Sony HCD-MD373 is a compact mini audio system that offers an impressive blend of sound quality, versatility, and advanced technology, making it an ideal choice for audio enthusiasts and casual listeners alike. One of the standout features of the HCD-MD373 is its MiniDisc recorder/player, a legacy technology that allows users to record high-quality audio onto MiniDiscs, providing an alternative to traditional CDs and cassettes. This feature is particularly appealing for those looking to capture live music or create personalized playlists.

Another notable aspect of the HCD-MD373 is its integrated CD player, which supports a variety of formats including CD, CD-R, and CD-RW. This versatility means that users can enjoy their favorite albums without the hassle of switching devices. The audio system also includes a built-in AM/FM tuner, enabling users to easily tune into their favorite radio stations and enjoy live broadcasts.

The HCD-MD373 is equipped with a powerful amplifier that delivers impressive sound output, complemented by its two-way speaker system. The speakers provide a rich audio experience with clear highs and deep lows, making it suitable for various music genres, from classical to contemporary. The system also features a bass boost function that enhances low-frequency sounds, allowing for a more immersive listening experience.

In terms of connectivity, the HCD-MD373 offers multiple inputs and outputs, including audio line-in, headphone jacks, and a digital optical output. These features make it easy to connect external devices such as MP3 players, smartphones, or even home theater systems. Additionally, the audio system supports various playback options, including shuffle and repeat modes, providing enhanced flexibility for users.

The design of the HCD-MD373 is sleek and modern, with a compact form factor that allows it to fit seamlessly into any living space. Its user-friendly interface, complete with an LCD display, makes it easy to navigate and control playback settings. Overall, the Sony HCD-MD373 is a testament to Sony's commitment to quality audio experiences, combining innovative features, robust technology, and elegant design into a single, powerful audio system. Whether enjoying a quiet evening at home or hosting a gathering with friends, the HCD-MD373 is sure to deliver satisfying sound and performance.

Contents

928-998-12 Specifications SELF-DIAGNOSIS Function Items of Error History Mode Items and Contents HK, SP, MY, AR, AUS, KR, JE Flexible Circuit Board RepairingAEP, UK Disassembly Table of ContentsDiagrams Exploded Views Cleaning the Optical Pickup CD Player Drawing OUT the Tray During Power OFFSection Servicing Note Removing the Indication Plate FL Service Position the Power Board Hot Reset Cold ResetLED and Fluorescent Indicator Tube All Lit, Key Check Mode Change-over of AM tuner Step between 9kHz and 10kHz Error History Display Mode Aging Mode Reading the BD Error History Display Reading the Mechanism Error History Display TEO JIG for Checking BD MD Board WaveformIOP Record Precedure Forced Reset Checks Prior to Parts Replacement and AdjustmentsREC/PLAY Main Board Component Side Tuning +/MD/CD/TUNING + Retry Cause Display Mode Hexadecimal nBinary Conversion Table Front Panel Section GeneralLocation of Parts and Controls Page Page Case Section Disassembly Back Panel Front Panel CD Mechanism Deck Main Board and Power Transformer Optical PICK-UP Section of CD KSS-213BA/F-NP TRAY, Gear and CAMCD Base Unit MD Mechanism Deck BD CD BOARD, Spindle Motor M101 and Sled Motor M102 Set the shaft of Cam gear to Spindle Motor M901 and Sled Motor M902 MD Over Write Head Optical PICK-UP of MD KMS-260B/J1N Precautions for USE of Test Mode Section Test ModeSetting the Test Mode Exiting the Test Mode Display Contents Mark Group Selecting the Test Mode Non-Volatile Memory Mode EEP Mode Operating the Continuous Playback ModeMID OUT Functions of Other Buttons Test Mode Displays Meanings of Other Displays MD Section Parts Replacement and Adjustment Section Electrical Adjustments Precautions for USE of Optical PICK- UP KMS-260B Precautions for Checking Laser Diode EmissinonPrecautions for Adjustments Creating Continuously Recorded Disc Laser Power Check Temperature Compensation Offset CheckChecks Prior to Repairs Specified Value CD Error Rate Check Play Checking MO Error Rate CheckFocus Bias Check Self-Recording/playback Check Temperature Compensation Offset Adjutment Initial Setting of Adjustment ValueLaser Power Adjustment Recording and Displaying the IOP Information Check Traverse Adjustment Press the ENTER/YES R button, display EFB = Focus Bias Adjustment Auto Gain Control Output Level Adjustment Error Rate CheckCD Auto Gain Control Output Level Adjustment MO Auto Gain Control Output Level Adjustment CD Section Adjusting Points and Connecting PointsCurve Check RF Level Check Circuit Boards Location HCD-MD373 Section Diagrams HCD-MD373 Block Diagrams BD CD Section REC BD MD /2 D/A Converter BD CD Section Main Section BD MD 1/2 Section Waveforms BD CD SectionBD MD 2/2 Section Main 3/3 Section Main Board Printed Wiring Board BD CD SectionSee page 40 for Circuit Boards Location Schematic Diagram BD CD Section Semiconductor Location Printed Wiring Board BD MD Section Schematic Diagram BD MD /2 MD Digital Board Schematic Diagram SP Section Printed Wiring Board SP Section Printed Wiring Board Main Section See page 68 for IC Block Diagrams Schematic Diagram Main /3 HCD-MD373 HCD-MD373 See page 45 for Waveforms See page 67 for IC Block Diagrams Schematic Diagram MD Digital Section Printed Wiring Board MD Digital Section Schematic Diagram AMP Section Printed Wiring Board AMP Section Schematic Diagram Panel Section Printed Wiring Board Panel Section Schematic Diagram Power Section Except AEP, UK Voltage Selector Printed Wiring Board Power SectionAEP, UK Printed Wiring Board BD Switch Section Schematic Diagram BD Switch SectionSchematic Diagram Loading Section Printed Wiring Board Loading Section BD MD Board 1/2 IC101 CXA2523AR IC Block Diagrams BD MD Board 2/2 IC121 CXD2654R IC152 BH6511FS-E2 IC153 LB1830M-S-TE-L BD CD Board IC101 CXD2587QC103 CXA2568M-T6 MD Digital Board Main Board 2/3 IC301 M62428AFP IC931 M62016L Main Board 3/3 IC171 LB1641Main Board 1/3 IC302 MC14052B IC PIN Functions IC101 Digital Signal Processor CXD2587Q Bdcd board Adio RfdcAVSS0 Igen IC101 RF Amplifier CXA2523AR Bdmd board MNT1 Shck MNT0 FOKMNT2 Xbusy MNT3 Sloc Avdd MvciRFI Avss Sprd FS4Spfd Fgin IC501 Master Control M30620ECFP-A21 Main board Stereo CD-RESETTuned ST-CE Case and Front Panel Section Section Exploded Views 59 #3 Chassis Section 125 126 106 105 MD Mechanism Deck MDM-5A113 110 107 MD Base Unit MBU-5A CD Mechanism Deck CDM55A-5SBD32 255 256 257 253 254 CD Base Unit BU-5SBD32252 254 258 251 CD Mechanism Deck CDM55C-5BD32 355 356 357 353 354 CD Base Unit BU-5BD32352 354 358 351 Section Electrical Parts List AMP AMP BD CD BD CD BD MD Inductor Chip BD MD MD Digital2SJ278MYTR 2SK1764KYTR Resistor MD Digital Loading Main Main EP1 Ground TerminalTerminal BOARD, Ground EP2 Description Remark R402 249-417-11 Panel Indicator TUBE, FluorescentPanel BOARD, Complete Jack LINE-IN Panel Power TRANSFORMER, SUB Power Switch Voltage SelestorPIN, Connector 7P SWITCH, Push 1 KEY Screw +B Hardware ListSCREW,PRECISION +P Memo HCD-MD373 Revision History