Sony MDS-PC2 service manual Table of Contents, Disassembly, Diagrams, Exploded Views

Page 5

SAFETY CHECK-OUT

After correcting the original service problem, perform the follow- ing safety checks before releasing the set to the customer:

Check the antenna terminals, metal trim, “metallized” knobs, screws, and all other exposed metal parts for AC leakage. Check leakage as described below.

LEAKAGE

The AC leakage from any exposed metal part to earth Ground and from all exposed metal parts to any exposed metal part having a return to chassis, must not exceed 0.5 mA (500 microampers). Leak- age current can be measured by any one of three methods.

1.A commercial leakage tester, such as the Simpson 229 or RCA WT-540A. Follow the manufacturers’ instructions to use these instruments.

2.A battery-operated AC milliammeter. The Data Precision 245 digital multimeter is suitable for this job.

3.Measuring the voltage drop across a resistor by means of a VOM or battery-operated AC voltmeter. The “limit” indication is 0.75 V, so analog meters must have an accurate low-voltage scale. The Simpson 250 and Sanwa SH-63Trd are examples of a pas- sive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2V AC range are suitable. (See Fig. A)

To Exposed Metal

Parts on Set

0.15μF

 

AC

1.5kΩ

voltmeter

 

 

 

(0.75V)

Earth Ground

Fig. A. Using an AC voltmeter to check AC leakage.

TABLE OF CONTENTS

 

1. SERVICING NOTE

6

2. GENERAL

12

3. DISASSEMBLY

 

3-1. Case and Front Panel

14

3-2. MD Mechanism

14

3-3. Slider (CAM)

15

3-4. Base Unit (MBU-5A) BD Board

15

3-5. SW Board and Loading Motor (M103)

16

4. TEST MODE

17

5. ELECTRICAL ADJUSTMENTS

22

6. DIAGRAMS

 

6-1. Circuit Boards Location

31

6-2. Block Diagrams

 

• BD Section

33

• Main Section

34

6-3. Printed Wiring Board – BD Section –

36

6-4. Schematic Diagram – BD (1/2) Section –

37

6-5. Schematic Diagram – BD (2/2) Section –

38

6-6. Schematic Diagram – Main (1/2) Section –

39

6-7. Schematic Diagram – Main (2/2) Section –

40

6-8. Printed Wiring Board – Main Section –

41

6-9. Schematic Diagram – Panel Section –

42

6-10. Printed Wiring Board – Panel Section –

43

6-11. Schematic Diagram – Power Section –

44

6-12. Printed Wiring Board – Power Section –

45

6-13. Schematic Diagram – BD Switch Section –

46

6-14. Printed Wiring Board – BD Switch Section –

46

6-15. IC Block Diagrams

46

6-15. IC Pin Functions

49

7. EXPLODED VIEWS

 

7-1. Cabinet Section

53

7-2. Mechanism Section (MDM-5A)

54

7-3. Base Unit Section (MBU-5A)

55

8. ELECTRICAL PARTS LIST

56

5

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Contents MDM-5A SpecificationsProgram SELF-DIAGNOSIS FunctionInput Items of Error History Mode Items and Contents Parts No Flexible Circuit Board RepairingDisassembly Table of ContentsDiagrams Exploded ViewsJIG for Checking BD Board Waveform Section Servicing NoteIOP TEORecord Precedure REC/PLAY Checks Prior to Parts Replacement and AdjustmentsCriteria for Determination Measure if unsatisfactory Power Board Component Side Forced ResetFluorescent Display Tube ALL Lighting and KEY Check Mode Higher Bits Lower Bits Hexa Retry Cause Display ModeCause of Retry Occurring conditions Bit BinaryHexadecimal Binary Bit When BinaryHigher Bits Lower Bits Hexa Details Front Panel Section GeneralMD Mechanism Section DisassemblyCase and Front Panel Base Unit MBU-5A and BD Board Slider CAMSW Board and Loading Motor M103 Precautions for USE of Test Mode Section Test ModeSetting the Test Mode Exiting the Test ModeGroup Selecting the Test ModeNon-Volatile Memory Mode EEP Mode Operating the Continuous Playback ModeMID OUTFunctions of Other Buttons Test Mode DisplaysMeanings of Other Displays Parts Replacement and Adjustment Section Electrical AdjustmentsPrecautions for USE of Optical PICK- UP KMS-260A Precautions for Checking Laser Diode EmissinonPrecautions for Adjustments Creating Continuously Recorded DiscLaser Power Check Temperature Compensation Offset CheckChecks Prior to Repairs Specified ValueCD Error Rate Check Play Checking MO Error Rate CheckFocus Bias Check EjectTemperature Compensation Offset Adjutment Initial Setting of Adjustment ValueLaser Power Adjustment Recording and Displaying the IOP InformationTraverse Adjustment 6EJECT Focus Bias AdjustmentAuto Gain Control Output Level Adjustment Error Rate CheckCD Auto Gain Control Output Level Adjustment MO Auto Gain Control Output Level AdjustmentBD Board Side B Adjusting Points and Connecting PointsCircuit Boards Location Section DiagramsMDS-PC2 Block Diagram BD SectionPB Digital out REC DigitalLD-LOVO Main SectionPanel Section WaveformsSee page 30 for Circuit Boards Location Printed Wiring Board BD SectionSchematic Diagram BD 1/2 Section Schematic Diagram BD 2/2 Section Schematic Diagram Main 1/2 Section Board Schematic Diagram Main 2/2 SectionPanel BD Board Panel Printed Wiring Board Main SectionPower Schematic Diagram Panel Section Main Board Printed Wiring Board Panel SectionSchematic Diagram Power Section Main Board BD Board Printed Wiring Board Power SectionBD section IC101 CXA2523AR Schematic Diagram BD Switch Section IC Block DiagramPrinted Wiring Board BD Switch Section IC152 BH6511FS-E2 IC121 CXD2654RIC441 LB1830M Main section IC301 UDA1341TS/N2Pin No Pin Name Function IC PIN FunctionsIC101 RF Amplifier CXA2523AR BD board MNT1 Shck MNT0 FOKMNT2 Xbusy MNT3 SlocAsyo MvciAsyi AvddFfdr TfdrFrdr FS4IC501 System Control M30620MC-406FP Main board PB-P OPT SEL Mode SELREC/PB SDACabinet Section CORD, Power UKSection Exploded Views Insulator F Mechanism Section MDM-5A509 4-988-466-21 Spring ELECTROSTATIC, Leaf 526 A-4680-417-A Holder Complete AssyMotor ASSY, Sled Base Unit Section MBU-5AHEAD, Over Light Back UP Section Electrical Parts List Main Elect CONNECTOR, FFC 15PGround Terminal Ferrite BeadPIN, Connector 2P PLUG, Connector 6PMain Panel VibratorPanel Power Power SW 928-916-11

MDS-PC2 specifications

The Sony MDS-PC2 is a compact yet powerful digital MiniDisc recorder that was designed to bring studio-quality recording capabilities to the consumer level. Launched in the late 1990s, this device was particularly notable for its versatility and advanced audio technologies, making it a favorite among audiophiles and home studio enthusiasts alike.

One of the standout features of the MDS-PC2 is its ability to record and playback audio with exceptional clarity. It utilizes the MiniDisc format, which employs a magneto-optical technology that allows for higher-quality recordings compared to traditional cassette formats. The MDS-PC2 supports various audio bit rates, including standard Stereo at 292 kbps and long play modes, which double the recording time at the cost of some audio fidelity. This flexibility allows users to tailor their recording settings to their specific needs.

The MDS-PC2 features an intuitive interface, including an easy-to-read LCD display that shows vital information about the track, such as its name, length, and remaining recording time. The device is equipped with multiple input options, including optical and analog connections, facilitating seamless integration into any audio setup. The built-in digital signal processor (DSP) enhances the recording quality by minimizing background noise and distortion, providing a clean and crisp listening experience.

Another notable characteristic is the MDS-PC2's editing capabilities. Users can easily create custom playlists, erase tracks, and rearrange audio sequences with a few simple commands. The unit also supports fade-in and fade-out functionalities, allowing for smooth transitions between tracks. The flexibility in editing makes it a potent tool for podcasters, musicians, and anyone looking to produce high-quality audio content.

Portability is another key aspect of the Sony MDS-PC2. Its lightweight design and durable build make it easy to transport, catering to users who are frequently on the move. Battery operation options provide additional convenience for those who wish to use the recorder away from a power source.

In summary, the Sony MDS-PC2 combines innovative technology with user-friendly features, making it an excellent choice for anyone seeking an efficient and high-quality MiniDisc recorder. Its capability to produce superior audio recordings, coupled with its adaptability and portability, has solidified its place as an essential tool for audio recording and playback in various settings.
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