Sony HCD-MD373 service manual Main Board 3/3 IC171 LB1641, Main Board 1/3 IC302 MC14052B

Page 68

• MAIN Board (3/3)

IC171 LB1641

 

 

 

 

 

 

 

 

T.S.D

 

 

 

 

 

 

 

 

O.C.P

 

 

MOTOR

 

 

 

 

 

 

 

MOTOR

 

 

DRIVE

 

 

 

 

 

 

 

DRIVE

 

 

 

 

 

FWD/REV/STOP

 

 

 

 

 

 

 

 

 

CONTROL LOGIC

 

 

 

 

 

1

2

3

4

5

6

7

8

9

10

GND

MOTOR DRIVE

NOISE FILTER

CLAMP

FWD.IN

REV.IN

VCC 1

VCC 2

NOISE FILTER

MOTOR

DRIVE

• MAIN Board (1/3)

 

IC302 MC14052B

 

 

2X0

1

16

VDD

2X2

2

15

X2

 

 

2XCOM

3

14

X1

 

 

2X3

4

13

XCOM

 

 

2X1

5

12

X0

 

 

INH

6

11

X3

VEE

7

10

A

VSS

8

9

B

• MAIN Board (2/3)

IC301 M62428AFP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IC931 M62016L

 

 

CLK

22

 

 

 

 

 

 

 

MICROCOMPUTER

 

 

 

 

 

 

21

DARA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

INTERFACE

 

 

 

 

 

 

 

 

 

 

COM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DVDD

23

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

LATCH

 

+

INTERRUPT SIGNAL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

–

GENERATING BLOCK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AVDD

24

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

19

DGND

 

COM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+

RESET SIGNAL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

–

GENERATING BLOCK

 

OUT2

25

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

18

OUT 1

 

 

 

 

 

 

 

 

SW19

 

 

 

470

 

470

 

 

 

SW18

 

 

 

1

2

3

4

5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

INBB2

26

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

17

INBEE1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BASS BOOST SW

 

 

 

 

 

 

 

 

BASS BOOST SW

 

 

 

GND

INT

RESET

CD

VCC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NFBB2

27

 

 

 

 

 

 

 

FIN

FIN

 

 

 

 

 

 

16

NFBB1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AMP2

AMP1

 

 

 

 

 

 

 

 

 

 

 

 

 

FBB2

28

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

15

FBB1

 

 

 

 

 

VOL IN2

29

 

 

 

 

 

 

 

VR2

VR1

 

 

 

 

 

 

14

VOL IN 1

 

 

 

 

 

TONE OUT2

30

24k

 

 

 

 

 

 

TONE

TONE

 

 

 

 

 

24k

13

TONE OUT 1

 

 

 

 

 

 

195k

195k

 

10k

 

 

 

10k

195k

195k

 

 

 

 

 

 

 

 

 

10k

 

 

AMP2

AMP1

 

 

10k

 

 

 

 

 

 

 

FTRE2

31

4.5k

 

 

 

 

 

 

 

 

 

 

 

 

 

4.5k

12

FTRE1

 

 

 

 

 

22.5k

 

 

SW17-B

 

 

 

 

 

 

 

 

SW16-B

 

22.5k

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8.5k

 

 

SW17-C

 

 

 

 

 

 

 

 

SW16-C

 

8.5k

 

 

 

 

 

 

 

FBAS2

32

3k

 

 

 

 

 

 

 

 

 

 

 

3k

11

FBAS1

 

 

 

 

 

 

 

 

SW15-B

 

 

 

 

 

 

 

 

SW14-B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NFBAS2

33

1.5k

 

 

SW15-C

 

 

 

 

 

 

 

 

SW14-C

 

1.5k

10

NFBAS1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BASE

 

 

 

 

 

 

 

 

BASE

 

 

 

 

 

 

 

 

 

INBAS2

34

 

 

AMP2

 

 

 

10k

 

10k

 

 

AMP1

 

 

9

INBAS1

 

 

 

 

 

 

 

 

56k

 

 

 

 

 

 

 

 

56k

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

REC OUT2

35

 

 

 

 

 

MIX

34.7k

34.7k

MIX

 

 

 

 

8

REC OUT1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

100k

 

 

 

 

 

 

 

 

100k

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AMP2

 

 

AMP1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IN2D

36

 

SW9

 

 

 

 

 

 

 

 

 

 

 

SW8

 

7

IN1D

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IN2C

37

100k

 

 

AMP2

 

44.7k

44.7k

34.7k

34.7k

44.7k

44.7k

BUFFER

100k

 

6

IN1C

 

 

 

 

 

 

 

 

 

 

 

AMP1

 

 

 

 

 

 

 

 

 

 

 

BUFFER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SW7

 

 

 

 

 

 

 

B

 

 

 

SW6

 

 

 

 

 

 

 

 

 

 

100k

 

 

 

 

 

B

A

A

 

 

 

100k

 

 

 

 

 

 

 

 

IN2B

38

 

 

 

 

 

 

 

 

 

 

 

5

IN1B

 

 

 

 

 

 

SW5

 

45.8k

 

 

 

 

45.8k

SW4

 

 

 

 

 

 

 

 

 

 

SW11

SW10

 

 

 

 

 

 

 

 

 

 

100k

 

 

100k

 

 

 

 

 

 

 

 

 

 

 

 

19k

 

 

 

 

 

 

 

 

19k

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IN2A

39

 

SW3

 

SW13

 

 

 

 

SW13

SW2

 

4

IN1A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MIC IN

40

100k

 

MIC

REF

 

 

 

AVCD

 

 

 

 

SURROUND SW

3

SUR C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AMP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SW1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VREFD

41

 

 

 

REF

 

 

 

51k

 

 

 

 

 

 

 

42

SUR R

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AMP

 

 

 

51k

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AGND

42

 

 

 

 

 

 

 

AGND

 

 

 

 

 

 

 

1

VREF1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

68

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Page 67 Page 69
Image 68
Page 67 Page 69
Contents Specifications 928-998-12SELF-DIAGNOSIS Function Items of Error History Mode Items and Contents HK, SP, MY, AR, AUS, KR, JE Flexible Circuit Board RepairingAEP, UK Table of Contents DisassemblyDiagrams Exploded ViewsDrawing OUT the Tray During Power OFF Cleaning the Optical Pickup CD PlayerSection Servicing Note Removing the Indication Plate FLService Position the Power Board Cold Reset Hot ResetLED and Fluorescent Indicator Tube All Lit, Key Check Mode Change-over of AM tuner Step between 9kHz and 10kHzAging Mode Error History Display ModeReading the Mechanism Error History Display Reading the BD Error History DisplayTEO JIG for Checking BD MD Board WaveformIOP Record Precedure Checks Prior to Parts Replacement and Adjustments Forced ResetREC/PLAY Main Board Component SideRetry Cause Display Mode Tuning +/MD/CD/TUNING +Hexadecimal nBinary Conversion Table Front Panel Section GeneralLocation of Parts and Controls Page Page Section Disassembly CaseFront Panel Back PanelMain Board and Power Transformer CD Mechanism DeckOptical PICK-UP Section of CD KSS-213BA/F-NP TRAY, Gear and CAMCD Base Unit BD CD BOARD, Spindle Motor M101 and Sled Motor M102 MD Mechanism DeckSet the shaft of Cam gear to Over Write Head Optical PICK-UP of MD KMS-260B/J1N Spindle Motor M901 and Sled Motor M902 MDSection Test Mode Precautions for USE of Test ModeSetting the Test Mode Exiting the Test ModeSelecting the Test Mode Display Contents Mark GroupOperating the Continuous Playback Mode Non-Volatile Memory Mode EEP ModeMID OUTTest Mode Displays Functions of Other ButtonsMeanings of Other Displays Section Electrical Adjustments MD Section Parts Replacement and AdjustmentPrecautions for Checking Laser Diode Emissinon Precautions for USE of Optical PICK- UP KMS-260BPrecautions for Adjustments Creating Continuously Recorded DiscTemperature Compensation Offset Check Laser Power CheckChecks Prior to Repairs Specified ValuePlay Checking MO Error Rate Check CD Error Rate CheckFocus Bias Check Self-Recording/playback CheckInitial Setting of Adjustment Value Temperature Compensation Offset AdjutmentLaser Power Adjustment Recording and Displaying the IOP InformationTraverse Adjustment CheckFocus Bias Adjustment Press the ENTER/YES R button, display EFB =Error Rate Check Auto Gain Control Output Level AdjustmentCD Auto Gain Control Output Level Adjustment MO Auto Gain Control Output Level AdjustmentAdjusting Points and Connecting Points CD SectionCurve Check RF Level CheckHCD-MD373 Section Diagrams Circuit Boards LocationBlock Diagrams BD CD Section HCD-MD373BD MD /2 RECD/A Converter Main Section BD CD SectionWaveforms BD CD Section BD MD 1/2 SectionBD MD 2/2 Section Main 3/3 SectionMain Board Printed Wiring Board BD CD SectionSee page 40 for Circuit Boards Location Schematic Diagram BD CD Section Printed Wiring Board BD MD Section Semiconductor LocationSchematic Diagram BD MD /2 MD Digital Board Schematic Diagram SP Section Printed Wiring Board SP Section Printed Wiring Board Main Section Schematic Diagram Main /3 See page 68 for IC Block DiagramsHCD-MD373 HCD-MD373 Schematic Diagram MD Digital Section See page 45 for Waveforms See page 67 for IC Block DiagramsPrinted 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 Schematic Diagram BD Switch Section Printed Wiring Board BD Switch SectionSchematic Diagram Loading Section Printed Wiring Board Loading SectionIC Block Diagrams BD MD Board 1/2 IC101 CXA2523ARIC152 BH6511FS-E2 BD MD Board 2/2 IC121 CXD2654RIC153 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 IC101 Digital Signal Processor CXD2587Q Bdcd board IC PIN FunctionsRfdc AdioAVSS0 IgenIC101 RF Amplifier CXA2523AR Bdmd board MNT0 FOK MNT1 ShckMNT2 Xbusy MNT3 SlocMvci AvddRFI AvssFS4 SprdSpfd FginIC501 Master Control M30620ECFP-A21 Main board CD-RESET StereoTuned ST-CESection Exploded Views Case and Front Panel SectionChassis Section 59 #3125 126 106 105 MD Mechanism Deck MDM-5A113 110 107 MD Base Unit MBU-5A CD Mechanism Deck CDM55A-5SBD32 CD Base Unit BU-5SBD32 255 256 257 253 254252 254 258 251CD Mechanism Deck CDM55C-5BD32 CD Base Unit BU-5BD32 355 356 357 353 354352 354 358 351Section Electrical Parts List AMP AMP BD CD BD CD BD MD BD MD MD Digital Inductor Chip2SJ278MYTR 2SK1764KYTR ResistorMD Digital Loading Main Main Ground Terminal EP1Terminal BOARD, Ground EP2Description Remark R402 249-417-11 Indicator TUBE, Fluorescent PanelPanel BOARD, Complete Jack LINE-INPanel Power Switch Voltage Selestor TRANSFORMER, SUB PowerPIN, Connector 7P SWITCH, Push 1 KEYScrew +B Hardware ListSCREW,PRECISION +P Memo HCD-MD373 Revision History

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.
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