Sony MZ-R50 - MD Walkman MiniDisc Recorder Service Manual
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Sony MZ-R50 - MD Walkman MiniDisc Recorder Service Manual

Service manual
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SERVICE MANUAL
US and foreign parts licensed Dolby Laboratories Licensing
Corporation.
System
Audio playing system
MiniDisc digital audio system
Laser diode properties
Material: GaAIAs
Wavelength:
= 780 nm
Emission duration: continuous
Laser output: less than 44.6 W
(This output is the value measured at a
distance of 200 mm from the lens surface on
the optical pick-up block with 7 mm
aperture.)
Recording and playback time
Maximum 74 minutes (MDW-74, stereo
recording)
Maximum 148 minutes (MDW-74, monaural
recording)
Revolutions
400 rpm to 900 rpm (CLV)
Error correction
Advanced Cross Interleave Reed Solomon
Code (ACIRC)
Sampling frequency
44.1 kHz
Sampling rate converter
Input: 32 kHz / 44.1 kHz / 48 kHz
Coding
Adaptive Transform Acoustic Coding (ATRAC)
Modulation system
EFM (Eight to Fourteen Modulation)
Number of channels
2 stereo channels
1 monaural channel
MICROFILM
MZ-R50
Model Name Using Similar Machanism
MD Machanism Type
Optical Pick-up Type
SPECIFICATIONS
Frequency response
20 to 20,000 Hz ± 3 dB
Wow and Flutter
Below measurable limit
Inputs
Microphone: stereo mini-jack, 0.22-0.78 mV
Line in: stereo mini-jack, 69-194 mV
Optical (Digital) in: optical (digital) mini-jack
Outputs
Headphones: stereo mini-jack, maximum
output level 5 mW+ 5 mW, load impedance
16 ohm
Line out: stereo mini-jack, 194 mV, load
impedance 10 kilohm
General
Power requirements
Sony AC Power Adaptor (supplied)
connected at the DC IN 6 V jack:
120 V AC, 60 Hz (US, Canadian model)
220-230 V AC, 50/60 Hz (AEP model)
230-240 V AC, 50/60 Hz (UK, Hong Kong model)
240 V AC, 50/60 Hz (Australian model)
100-240 V AC, 50/60 Hz (E, Tourist model)
Lithium ion rechargeable battery LIP-8 (supplied)
Two LR6 (size AA) alkaline batteries (not supplied)
PORTABLE MINIDISC RECORDER
US Model
Canadian Model
AEP Model
UK Model
E Model
Australian Model
Tourist Model
NEW
MT-MZR-50-143
KMS-280A
– Continued on page 2 –

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Summary of Contents for Sony MZ-R50 - MD Walkman MiniDisc Recorder

  • Page 1 General Maximum 148 minutes (MDW-74, monaural Power requirements recording) Sony AC Power Adaptor (supplied) Revolutions connected at the DC IN 6 V jack: 400 rpm to 900 rpm (CLV) 120 V AC, 60 Hz (US, Canadian model) Error correction...

  • Page 2: Table Of Contents

    REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY SUPPLEMENTS PUBLISHED BY SONY. DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

  • Page 3: Servicing Note

    SECTION 1 SERVICING NOTE When repairing this device with the power on, if you remove the main board or open the upper panel assembly, this device stops working. In this case, you can work without the device stopping by fastening the hook of the Open/Close detection switch (S817) with tape Tape Upper panel assy Door open/close...

  • Page 4: General

    SECTION 2 This section is extracted from GENERAL instruction manual. – 4 –...

  • Page 20: Disassembly

    SECTION 3 DISASSEMBLY The equipment can be removed using the following procedure. Upper panel assy, Bottom panel assy Main board Mechanism deck Optical pick-up assy, REC board CLV board Battery case assy Power board, Switch board SWITCH UNIT (with JOG DIAL) Note : Follow the disassembly procedure in the numerical order given.

  • Page 21: Main Board Removal

    3-2. MAIN BOARD REMOVAL 2 Screw (HP) 1 Screws (M1.4 toothed lock) Main board 3 OP flexible board (Main board CN501) 7 LCD flexible board (Main board CN803) 4 JOG unit flexible board (Main board CN904) 6 MD frexible board (Main board CN502) 5 Flat cable (24 core) (Main board CN801)

  • Page 22: Optical Pick-Up Assy, Rec Board Removal

    3-4. OPTICAL PICK-UP ASSY, REC BOARD REMOVAL Optical pick-up assy 2 Screws (M1.4x3.0 locking) 4 MD flexible board REC board 1 OP flexible board 5 Screw 3-5. CLV BOARD REMOVAL 1 Screws (M1.4 precision pan) CLV board 2 Remove solder Mechanism deck –...

  • Page 23: Battery Case Assy Removal

    3-6. BATTERY CASE ASSY REMOVAL 2 Screws (M1.4 precision pan) Battery case assy Chassis (Main) assy 3-7. POWER BOARD, SWITCH BOARD REMOVAL 2 Remove solder 1 Screws (M1.4 toothed lock) Power board Remove solder Battery case assy Switch board – 23 –...

  • Page 24: Switch Unit (With Jog Dial) Removal

    3-8. SWITCH UNIT (WITH JOG DIAL) REMOVAL Ornamental belt assy 1 Screw (Precision) Switch unit (with JOG dial) Chassis (Main) assy Holder (dial) 4 Screws (1.7) – 24 –...

  • Page 25: Test Mode

    SECTION 4 TEST MODE [Outline] [Operations When Test Mode is Set] • The general adjustment mode of this unit performs CD and MO When the test mode is set, the LCD will display as follows. adjustments automatically when set. In this mode, the disc is de- termined if CD or MO and adjustments are automatically per- Self-diagnostic display formed in order.
  • Page 26 [Servo Mode] • Set the test mode, press the + key, and set the servo mode using the VOLUME + and – keys. • When the servo mode is set, the optical pickup will move to the outer circumference or inner circumference if the + key or = key is pressed.
  • Page 27 • Adjusting Method Note : There is basically no display for individual adjustment items. Only such upper position titles as SERVO, AUDIO, etc. p key Mode : 046 (100s position) are displayed. Low reflection CD tracking 1. When the adjustment modes are set according to “Structure of gain adjustment Servo Mode”, the last two digits of the mode number and the ”...
  • Page 28 [Audio Mode] • Set the test mode, press the + key, and set the audio mode using the VOLUME + and – keys. • To set other modes, refer to “Structure of Test Mode”. p key Mode : 134 • Structuer of Audio Mode MIC GAIN Mode : 100 ”...
  • Page 29 [Mecha Mode] • Set the test mode, press the + key, and set the mecha mode using the VOLUME + and – keys. • To set other modes, refer to “Structure of Test Mode”. p key Mode : 150 • Structure of Mecha Mode Digital AGC Adjustment 3 ”...
  • Page 30 1. Set the test mode, press the = key to set the general adjust- NG mode No. (Last 2 digits) ment mode. 2. Load the CD test disc (TDYS-1) or SONY MO disc available on 55 7F Adjustment results the market.

  • Page 31: Adjustments

    SECTION 5 ADJUSTMENTS 5-1. Precautions for Laser Diode Emission Check 5-4. DD 2.8V Adjustment When checking the emission of the laser diode during adjustments, Connection : Digital voltmeter never view directly downwards as this may lead to blindness. POWER board 5-2.
  • Page 32 5-5. Laser Power Check 5-6. MO Traverse Adjustment Connection : Connection : Laser Oscilloscope power meter MAIN board TP5980 (TE) Optical pickup AP5430 (VC) objective lens Adjusting Method : Digital voltmeter 1. Set the servo mode of the test mode (Mode : 000). 2.
  • Page 33 5-7. Low Reflection CD Traverse Adjustment 5-9. CD RF Level Check Connection : Connection : Oscilloscope Oscilloscope MAIN board MAIN board TP5980 (TE) AP5500 (RF) AP5430 (VC) AP5430 (VC) Adjusting Method : Digital voltmeter 1. Set the servo mode of the test mode (Mode : 000). MAIN board 2.
  • Page 34 Adjustment Location : [MAIN BOARD] (SIDE B) AP574 (LDIO) AP5500 (RF) IC503 C510 AP5500 (RF) AP574 (LDIO) IC501 AP5430 (RF) C504 CN501 AP5117 (VCC) AP5430 AP5117 (RF) (VCC) [MAIN BOARD] (SIDE A) SP543 TP5980 (TE) TP5980 (TE) – 34 –...

  • Page 35: Diagrams

    SECTION 6 DIAGRAMS 6-1. EXPLANATION OF IC TERMINALS IC503 DIGITAL SERVO, ATRAC (CXD2652AR) Pin No. Pin name Description MNT 0 Traverse count signal output. MNT 1 Track jump detect output. MNT 2 – Not used (Open). MNT 3 – Not used (Open). SWDT Inputs write data signal from system controller (IC801).
  • Page 36 Pin No. Pin name Description – Ground terminal. – Not used (Open). Decoder PLL master clock PLL phase comparison output. FILI Decoder PLL master clock PLL filter input. FILO Decoder PLL master clock PLL filter output. CLTV Decoder PLL master clock PLL VCO control voltage input. PEAK Inputs peak hold signal for light amount signal from RF amplifier (IC501).
  • Page 37 IC801 SYSTEM CONTROL (CXP81960M-652R) Pin No. Pin name Description CLCS Chip select output to real time clock (IC804). XRST Reset output. L : Reset WRPWR Laser power switching signal output. Write data transfer timing output. SENSE Internal status (SENSE) input. LDON Laser ON signal.
  • Page 38 Pin No. Pin name Description AVREF A/D converter reference voltage input. – A/D converter power supply terminal. AM3 MNT AC adaptor or EXT battery detection input. L : EXT battery TEMP Temp meter (IC803) input. KEY3 PLAY/REC key input. KEY4 Key input.

  • Page 39: Block Diagrams

    MZ-R50 6-2. BLOCK DIAGRAM 6-3. CIRCUIT BOARDS LOCATION REC board CLV board MAIN board POWER board SWITCH board • Signal path. : PB : REC : MIC – 39 – – 40 – – 41 – – 42 – – 43 –...

  • Page 40: Schematic Diagram - Main (1/3) Section

    6-5. SCHEMATIC DIAGRAM – MAIN (1/3) SECTION – Refer to page 61 for IC Block Diagram. MZ-R50 WAVEFORMS 1.1Vp-p IC501 #• VOLT/DIV : 0.5V AC TIME/DIV : 1 sec Approx. 0.5Vp-p IC501 @ª VOLT/DIV : 0.1V AC TIME/DIV : 1msec 2.8Vp-p 13.4msec IC503 !¡...

  • Page 41: Schematic Diagram - Main (2/3) Section

    MZ-R50 6-6. SCHEMATIC DIAGRAM – MAIN (2/3) SECTION – Refer to page 62 for IC Block Diagrams. Note: • All capacitors are in F unless otherwise noted. pF: 50 WV or less are not indicated except for electrolytics and tantalums. •...

  • Page 42: Schematic Diagram - Main (3/3) Section

    MZ-R50 Refer to page 64 for IC Block Diagrams. 6-7. SCHEMATIC DIAGRAM – MAIN (3/3) SECTION – WAVEFORMS 2.3Vp-p 12MHz IC801 $º VOLT/DIV : 1V AC TIME/DIV : 20nsec 0.8Vp-p 32kHz IC804 2 VOLT/DIV : 0.1V AC TIME/DIV : 10 sec Note: •...
  • Page 43 MZ-R50 IC BLOCK DIAGRAMS – MAIN (1/3) SECTION – IC501 CXA2523AR-T4 43 42 USROP RF AGC RFA I USRC BPF3T RF A2 PEAK3T HLPT CFST PTGR TEMP PEAK BOTM BOTTOM GRVA ABCD I VR BPFC ABCDA ADFG ADAGC I VR ADIN I VR BPF 22...
  • Page 44 IC506 MPC18A20VM CONTROL CHARGE PUMP LOGIC PRE DRIVER COMP COMP VREF DRIVER LOGIC BIAS VREF IC BLOCK DIAGRAMS – MAIN (2/3) SECTION – IC804 DS1302Z VCC2 VCC1 SCLK OSCILATOR REAL TIME AND DIVIDER CLOCK INPUT CHIFT DATA BUS REGISTERS COMMAND AND ADDRESS BUS CONTROL LOGIC IC806 MB3800PNF...
  • Page 45 IC802 RS5RJ29261 VLX LIMITER SOFT START VREF 1 VD OUT VREF 2 VD IN V OUT IC807 AK93C45AV-L DATA REGISTER R/W AMPS & AUTO ERASE VTEF INSTRUCTION INSTRUCTION REGISTER EEPROM DECODE GENERATOR CONTROL & 1024BIT CLOCK 64X16 GENERATION VPP SW DECODER BUFFERS –...
  • Page 46 IC BLOCK DIAGRAM – MAIN (3/3) SECTION – IC303 AK4515-VQ DGND LIN1 XRST LIN2 LIN3 RIN1 RIN2 LRCK RIN3 BCLK SDTO Audio I/F SDTI Controller VCOM DIF0 DIF1 LOUT DPGA ROUT TST1 VRDA TST2 TST3 CLOCK CONTROL REGISTER TST4 DRIVER AGND –...

  • Page 47: Exploded Views

    SECTION 7 EXPLODED VIEWS NOTE : • -XX, -X mean standardized parts, so they • The mechanical parts with no reference The components identified by mark ! may have some difference from the original number in the exploded views are not or dotted line with mark ! are critical one.

  • Page 48: Chassis Section

    7-2. CHASSIS SECTION Mechanism deck Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark X-4949-116-1 CASE ASSY, BATTERY 4-995-434-01 HOLDER (DIAL) 1-782-709-11 WIRE (FLAT TYPE) (22 CORE) 1-475-378-11 SWITCH UNIT (WITH JOG DIAL) A-3293-759-A SWITCH BOARD, COMPLETE 4-963-883-41 SCREW (M1.4), PRECISION PAN 3-335-797-91 SCREW (M1.4), TOOTHED LOCK 4-995-432-01 HINGE, BATTERY...

  • Page 49: Mechanism Deck Section

    7-3. MECHANISM DECK SECTION (MT-MZR50-143) M901 M903 M902 The components identified by Les composants identifiés par une mark ! or dotted line with mark marque ! sont critiques pour ! are critical for safety. la sécurité. Replace only with part number Ne les remplacer que par une pièce specified.

  • Page 50: Electrical Parts List

    SECTION 8 MAIN ELECTRICAL PARTS LIST NOTE : • Due to standardization, replacements in the • SEMICONDUCTORS The components identified by mark ! parts list may be different from the parts In each case, u : , for example : or dotted line with mark ! are critical specified in the diagrams or the components uA..
  • Page 51 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C220 1-107-823-11 CERAMIC CHIP 0.47uF C521 1-164-677-11 CERAMIC CHIP 0.033uF C221 1-109-982-11 CERAMIC CHIP C522 1-162-970-11 CERAMIC CHIP 0.01uF C222 1-162-957-11 CERAMIC CHIP 220PF C524 1-164-156-11 CERAMIC CHIP 0.1uF C223 1-117-919-11 TANTAL.
  • Page 52 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C829 1-109-982-11 CERAMIC CHIP IC509 8-759-487-11 IC MB81V16405B-60PFTN-2.8 IC510 8-759-487-20 IC PST9330UL C830 1-110-569-11 TANTAL. CHIP 47uF 6.3V IC702 8-759-482-07 IC MPC17A28SVMEL C831 1-104-852-11 TANTAL. CHIP 22uF IC801 8-752-894-67 IC CXP81960M-652R C833...
  • Page 53 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark Q810 8-729-905-35 TRANSISTOR 2SC4081-R R310 1-216-837-11 METAL CHIP 1/16W Q811 8-729-927-62 TRANSISTOR UMX1 R352 1-500-444-11 INDUCTOR Q901 8-729-042-81 TRANSISTOR FZT788BTC R355 1-216-847-11 METAL CHIP 150K 1/16W R359 1-500-444-11 INDUCTOR Q902 8-729-026-53 TRANSISTOR 2SA1576A-T106-QR...
  • Page 54 MAIN POWER Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R802 1-216-851-11 METAL CHIP 330K 1/16W R803 1-216-857-11 METAL CHIP 1/16W RB808 1-233-973-11 RES, NETWORK (CHIP TYPE) 100K R816 1-216-851-11 METAL CHIP 330K 1/16W < SWITCH > R817 1-216-851-11 METAL CHIP 330K...
  • Page 55 POWER REC SWITCH Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark L804 1-414-410-21 INDUCTOR 10uH < SWITCH > L805 1-414-410-21 INDUCTOR 10uH S801 1-572-921-11 SWITCH, KEY BOARD (ERASE) < TRANSISTOR > S802 1-572-921-11 SWITCH, KEY BOARD (END SERCH) S803 1-572-921-11 SWITCH, KEY BOARD (T MARK) Q803...
  • Page 56 MZ-R50 Sony Corporation 97L0290-1 Printed in Japan © 1997.12 9-923-258-11 Personal A&V Products Company Published by Quality Engineering Dept. – 74 – (Shibaura)

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