Main Board 3/3 IC171 LB1641 | Sony HCD-MD373 specs

• 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
2X2	2
2XCOM	3	14	X1
2XCOM	3
2X3	4	13	XCOM
2X3	4
2X1	5	12	X0
2X1	5
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

Image 68

Sony HCD-MD373 Main Board 3/3 IC171 LB1641, Main Board 1/3 IC302 MC14052B, Main Board 2/3 IC301 M62428AFP IC931 M62016L

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

Specifications 928-998-12 SELF-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 Views Drawing OUT the Tray During Power OFF Cleaning the Optical Pickup CD PlayerSection Servicing Note Removing the Indication Plate FL Service 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 10kHz Aging Mode Error History Display Mode Reading the Mechanism Error History Display Reading the BD Error History Display TEO JIG for Checking BD MD Board WaveformIOP Record Precedure Checks Prior to Parts Replacement and Adjustments Forced ResetREC/PLAY Main Board Component Side Retry Cause Display Mode Tuning +/MD/CD/TUNING + Hexadecimal nBinary Conversion Table Front Panel Section GeneralLocation of Parts and Controls Page Page Section Disassembly Case Front Panel Back Panel Main Board and Power Transformer CD Mechanism Deck Optical 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 Deck Set the shaft of Cam gear to Over Write Head Optical PICK-UP of MD KMS-260B/J1N Spindle Motor M901 and Sled Motor M902 MD Section Test Mode Precautions for USE of Test ModeSetting the Test Mode Exiting the Test Mode Selecting the Test Mode Display Contents Mark Group Operating the Continuous Playback Mode Non-Volatile Memory Mode EEP ModeMID OUT Test Mode Displays Functions of Other Buttons Meanings of Other Displays Section Electrical Adjustments MD Section Parts Replacement and Adjustment Precautions for Checking Laser Diode Emissinon Precautions for USE of Optical PICK- UP KMS-260BPrecautions for Adjustments Creating Continuously Recorded Disc Temperature Compensation Offset Check Laser Power CheckChecks Prior to Repairs Specified Value Play Checking MO Error Rate Check CD Error Rate CheckFocus Bias Check Self-Recording/playback Check Initial Setting of Adjustment Value Temperature Compensation Offset AdjutmentLaser Power Adjustment Recording and Displaying the IOP Information Traverse Adjustment Check Focus 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 Adjustment Adjusting Points and Connecting Points CD SectionCurve Check RF Level Check HCD-MD373 Section Diagrams Circuit Boards Location Block Diagrams BD CD Section HCD-MD373 BD MD /2 REC D/A Converter Main Section BD CD Section Waveforms BD CD Section BD MD 1/2 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 Printed Wiring Board BD MD Section Semiconductor Location Schematic 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 Diagrams HCD-MD373 HCD-MD373 Schematic Diagram MD Digital Section See page 45 for Waveforms See page 67 for IC Block Diagrams 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 Schematic Diagram BD Switch Section Printed Wiring Board BD Switch SectionSchematic Diagram Loading Section Printed Wiring Board Loading Section IC Block Diagrams BD MD Board 1/2 IC101 CXA2523AR IC152 BH6511FS-E2 BD MD Board 2/2 IC121 CXD2654R 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 IC101 Digital Signal Processor CXD2587Q Bdcd board IC PIN Functions Rfdc AdioAVSS0 Igen IC101 RF Amplifier CXA2523AR Bdmd board MNT0 FOK MNT1 ShckMNT2 Xbusy MNT3 Sloc Mvci AvddRFI Avss FS4 SprdSpfd Fgin IC501 Master Control M30620ECFP-A21 Main board CD-RESET StereoTuned ST-CE Section Exploded Views Case and Front Panel Section Chassis Section 59 #3 125 126 106 105 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 254 258 251 CD Mechanism Deck CDM55C-5BD32 CD Base Unit BU-5BD32 355 356 357 353 354352 354 358 351 Section Electrical Parts List AMP AMP BD CD BD CD BD MD BD MD MD Digital Inductor Chip2SJ278MYTR 2SK1764KYTR Resistor MD Digital Loading Main Main Ground Terminal EP1Terminal BOARD, Ground EP2 Description Remark R402 249-417-11 Indicator TUBE, Fluorescent PanelPanel BOARD, Complete Jack LINE-IN Panel Power Switch Voltage Selestor TRANSFORMER, SUB PowerPIN, Connector 7P SWITCH, Push 1 KEY Screw +B Hardware ListSCREW,PRECISION +P Memo HCD-MD373 Revision History