Sony HCD-MD373 Initial Setting of Adjustment Value, Recording and Displaying the IOP Information

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8.“C1 = AD = ” will be displayed.

9.Check that the C1 error becomes below 80 and the AD error below 2.

10.Press the MENU/NO “R” button to stop playback, and press the 6 (MD) button and remove the disc.

5-7. INITIAL SETTING OF ADJUSTMENT VALUE

Note:

Mode which sets the adjustment results recorded in the non-volatile memory to the initial setting value. However the results of the temperature compensation offset adjustment will not change to the initial setting value.

If initial setting is performed, perform all adjustments again excluding the temperature compensation offset adjustment.

For details of the initial setting, refer to “5-4. Precautions on Adjustments” and execute the initial setting before the adjustment as required.

Setting Procedure :

1.Press the =0/MD/CD/TUNING – button or )+/ MD/CD/TUNING + button to display “ADJ CLEAR”.

2.Press the ENTER/YES “R” button. “Complete!” will be dis- played momentarily and initial setting will be executed, after which “ADJ CLEAR” will be displayed.

5-8. RECORDING AND DISPLAYING THE IOP INFORMATION

The IOP data can be recorded in the non-volatile memory. The IOP value on the label of the optical pickup and the IOP value after the adjustment will be recorded. Recording these data eliminates the need to read the label on the optical pick-up.

Recording Procedure :

1.When the power ON, press the 1/u button while pressing the p(MD) button and r (REC) button together.

2.Press the =0/MD/CD/TUNING – button or )+/ MD/CD/TUNING + button to display “[Service]”, and press the ENTER/YES “R” button. (If nothing is displayed, press the

FUNCTION button and set the function to “MD”.

3.Press the =0/MD/CD/TUNING – button or )+/ MD/CD/TUNING + button to display “Iop.Write”, and press

the ENTER/YES “R” button.

4.The display becomes Ref=@@@.@ (@ is an arbitrary number) and the numbers which can be changed will blink.

5.Input the IOP value written on the optical pick-up.

To select the number : Press the =0/MD/CD/TUNING – button or )+/MD/CD/TUNING + button.

To select the digit : Press the SYNC REC button.

6.When the ENTER/YES “R” button is pressed, the display be- comes “Measu=@@@.@” (@ is an arbitrary number).

7.As the adjustment results are recorded for the 6 value. Leave it as it is and press the ENTER/YES “R” button.

8.“Complete!” will be displayed momentarily. The value will be recorded in the non-volatile memory and the display will become “Iop Write”.

Display Procedure :

1.Press the =0/MD/CD/TUNING – button or )+/ MD/CD/TUNING + button to display “Iop.Read”.

2.When the ENTER/YES “R” button is pressed, “@@.@/##.#” will be displayed and the recorded contents are displayed.

@@.@ indicates the Iop value labeled on the pick-up. ##.# indicates the Iop value after adjustment

3.To end, press the SYNC REC button or MENU/NO “R” but- ton to display “Iop Read”.

5-9. TEMPERATURE COMPENSATION OFFSET ADJUTMENT

Save the temperature data at that time in the non-volatile memory as 25 ˚C reference data.

Note :

1.Usually, do not perform this adjustment.

2.Perform this adjustment in an ambient temperature of 22 ˚C to 28 ˚C. Perform it immediately after the power is turned on when the internal temperature of the unit is the same as the ambient temperature of 22 ˚C to 28 ˚C.

3.When D101 has been replaced, perform this adjustment after the temperature of this part has become the ambient tempera- ture.

Adjusting Procedure :

1.Press the =0/MD/CD/TUNING – button or )+/ MD/CD/TUNING + button and display “TEMP ADJUST”.

2.Press the ENTER/YES “R” button and select the “TEMP AD- JUST” mode.

3.“TEMP = [OK]” and the current temperature data will be displayed.

4.To save the data, press the ENTER/YES “R” button.

When not saving the data, press the MENU/NO “R” button.

5. When the ENTER/YES “R” button is pressed, “TEMP = SAVE” will be displayed and turned back to “TEMP ADJUST” display then. When the MENU/NO “R” button is pressed, “TEMP ADJUST” will be displayed immediatelly.

Specified Value :

The “TEMP = ” should be within “E0 - EF”, “F0 - FF”, “00 - 0F”, “10 - 1F” and “20 - 2F”.

5-10. LASER POWER ADJUSTMENT

Check the IOP value of the optical pick-up before adjustments. (Refer to 5-8. Recording and Displaying IOP Information.)

Connection :

Laser power meter

Optical pick-up objective lens

Digital volt meter

BD (MD) board

CN110 pin 5 (I+3V)

CN110 pin 4 (IOP)

Adjusting Procedure :

1.Set the laser power meter on the objective lens of the optical pick-up. (When it cannot be set properly, press the =0/ MD/CD/TUNING – button or )+/MD/CD/TUNING +

button continuously to move the optical pick-up.)

Connect the digital volt meter to CN110 pin 5 (I+3V) and CN110 pin 4 (IOP).

2.Press the =0/MD/CD/TUNING – button or )+/

MD/CD/TUNING + button and display “LDPWR ADJUST”. (Laser power : For adjustment)

3.Press the ENTER/YES “R” button once and display “LD 0.9 mW $ ”.

4.Press the =0/MD/CD/TUNING – button or )+/ MD/CD/TUNING + button so that the reading of the laser power

meter becomes 0.85 to 0.91 mW. Press the ENTER/YES “R” button after setting the range knob of the laser power meter, and save the adjustment results. (“LD SAVE $ ” will be displayed for a moment.)

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Contents 928-998-12 SpecificationsSELF-DIAGNOSIS Function Items of Error History Mode Items and Contents HK, SP, MY, AR, AUS, KR, JE Flexible Circuit Board RepairingAEP, UK Exploded Views Table of ContentsDisassembly DiagramsRemoving the Indication Plate FL Drawing OUT the Tray During Power OFFCleaning the Optical Pickup CD Player Section Servicing NoteService Position the Power Board Change-over of AM tuner Step between 9kHz and 10kHz Cold ResetHot Reset LED and Fluorescent Indicator Tube All Lit, Key Check ModeError History Display Mode Aging ModeReading the BD Error History Display Reading the Mechanism Error History DisplayTEO JIG for Checking BD MD Board WaveformIOP Record Precedure Main Board Component Side Checks Prior to Parts Replacement and AdjustmentsForced Reset REC/PLAYTuning +/MD/CD/TUNING + Retry Cause Display ModeHexadecimal nBinary Conversion Table Front Panel Section GeneralLocation of Parts and Controls Page Page Case Section DisassemblyBack Panel Front PanelCD Mechanism Deck Main Board and Power TransformerOptical 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 M102Set the shaft of Cam gear to Spindle Motor M901 and Sled Motor M902 MD Over Write Head Optical PICK-UP of MD KMS-260B/J1NExiting the Test Mode Section Test ModePrecautions for USE of Test Mode Setting the Test ModeDisplay Contents Mark Group Selecting the Test ModeOUT Operating the Continuous Playback ModeNon-Volatile Memory Mode EEP Mode MIDFunctions of Other Buttons Test Mode DisplaysMeanings of Other Displays MD Section Parts Replacement and Adjustment Section Electrical AdjustmentsCreating Continuously Recorded Disc Precautions for Checking Laser Diode EmissinonPrecautions for USE of Optical PICK- UP KMS-260B Precautions for AdjustmentsSpecified Value Temperature Compensation Offset CheckLaser Power Check Checks Prior to RepairsSelf-Recording/playback Check Play Checking MO Error Rate CheckCD Error Rate Check Focus Bias CheckRecording and Displaying the IOP Information Initial Setting of Adjustment ValueTemperature Compensation Offset Adjutment Laser Power AdjustmentCheck Traverse AdjustmentPress the ENTER/YES R button, display EFB = Focus Bias AdjustmentMO Auto Gain Control Output Level Adjustment Error Rate CheckAuto Gain Control Output Level Adjustment CD Auto Gain Control Output Level AdjustmentRF Level Check Adjusting Points and Connecting PointsCD Section Curve CheckCircuit Boards Location HCD-MD373 Section DiagramsHCD-MD373 Block Diagrams BD CD SectionREC BD MD /2D/A Converter BD CD Section Main SectionMain 3/3 Section Waveforms BD CD SectionBD MD 1/2 Section BD MD 2/2 SectionMain 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 SectionSchematic 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 /3HCD-MD373 HCD-MD373 See page 45 for Waveforms See page 67 for IC Block Diagrams Schematic Diagram MD Digital SectionPrinted 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 Loading Section Schematic Diagram BD Switch SectionPrinted Wiring Board BD Switch Section Schematic Diagram Loading SectionBD MD Board 1/2 IC101 CXA2523AR IC Block DiagramsBD MD Board 2/2 IC121 CXD2654R IC152 BH6511FS-E2IC153 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 boardIgen RfdcAdio AVSS0IC101 RF Amplifier CXA2523AR Bdmd board MNT3 Sloc MNT0 FOKMNT1 Shck MNT2 XbusyAvss MvciAvdd RFIFgin FS4Sprd SpfdIC501 Master Control M30620ECFP-A21 Main board ST-CE CD-RESETStereo TunedCase and Front Panel Section Section Exploded Views59 #3 Chassis Section125 126 106 105 MD Mechanism Deck MDM-5A113 110 107 MD Base Unit MBU-5A CD Mechanism Deck CDM55A-5SBD32 258 251 CD Base Unit BU-5SBD32255 256 257 253 254 252 254CD Mechanism Deck CDM55C-5BD32 358 351 CD Base Unit BU-5BD32355 356 357 353 354 352 354Section Electrical Parts List AMP AMP BD CD BD CD BD MD 2SK1764KYTR Resistor BD MD MD DigitalInductor Chip 2SJ278MYTRMD Digital Loading Main Main EP2 Ground TerminalEP1 Terminal BOARD, GroundDescription Remark R402 249-417-11 Jack LINE-IN Indicator TUBE, FluorescentPanel Panel BOARD, CompletePanel Power SWITCH, Push 1 KEY Switch Voltage SelestorTRANSFORMER, SUB Power PIN, Connector 7PScrew +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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