Sony MZ-R91 Service Manual
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Sony MZ-R91 Service Manual

Sony MZ-R91 Service Manual

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SERVICE MANUAL
Ver 1.4 2001.01
With SUPPLEMENT-1
(9-927-187-83)
US and foreign patents licensed from Dolby
Laboratories Licensing Corporation.
System
Audio playing system
MiniDisc digital audio system
Laser diode properties
Material: GaAlAs
Wavelength: λ = 790 nm
Emission duration: continuous
Laser output: less than 44.6 µW
(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 80 minutes (MDW-80, stereo
recording)
Maximum 160 minutes (MDW-80, monaural
recording)
Maximum 74 minutes (MDW-74, stereo
recording)
Maximum 148 minutes (MDW-74, monaural
recording)
Revolutions
400 rpm to 1,800 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
Frequency response
20 to 20,000 Hz ± 3 dB
Wow and Flutter
Below measurable limit
Inputs
Microphone: stereo mini-jack, 0.35–1.38 mV
Line in: stereo mini-jack, 69–194 mV
Optical (Digital) in: optical (digital) mini-jack
Outputs
i/LINE OUT*: stereo mini-jack
Headphones: maximum output level 5 mV +
5 mV, load impedance 16 ohm
MZ-R90/R91
Photo: MZ-R91 (Blue type)
Model Name Using Similar Mechanism
Mechanism Type
Optical Pick-up Name

SPECIFICATIONS

LINE OUT: 194 mV, load impedance 10
kilohm
* The i/LINE OUT jack connects either
headphones or a line cable.
General
Power requirements
Sony AC Power Adaptor (supplied) connected
at the DC IN 3 V jack:
220–230 V AC, 50/60 Hz (European model)
120 V AC, 50 Hz (Canadian model)
100–240 V AC, 50/60 Hz (Other models)
Nickel metal hydride rechargeable battery NH-
14WM (supplied)
LR6 (size AA) alkaline battery (not supplied)
Battery operation time
1)
Battery life
Batteries
Recording
Playback
2)
NH-14WM
Approx.
Approx.
nickel metal
6.5 hours
12 hours
hydride
rechargeable
battery
LR6 (SG)
Approx.
Approx.
(size AA)
4 hours
16.5
Sony alkaline
hours
dry battery
NH-14WM
Approx.
Approx.
nickel metal
14.5 hours
29 hour
hydride
rechargeable
battery
+ One LR6
(SG) (size AA)
PORTABLE MINIDISC RECORDER
US Model
Canadian Model
Australian Model
Chinese Model
AEP Model
UK Model
E Model
Tourist Model
MZ-R90/R91
NEW
MT-MZR90-165
LCX-2R
1)
The battery life may be shorter due to
operating conditions and the temperature of
the location.
2)
When you record, use a fully charged
rechargeable battery.
Dimensions
MZ-R90
Approx. 78.9 × 17.3 × 72.0 mm (w/h/d)
×
× 2
1
11
7
(3
/
/
/
in.)
8
16
8
MZ-R91
Approx. 78.9 × 18.0 × 72.0 mm (w/h/d)
×
× 2
(3
1
/
23
/
7
/
in.)
8
32
8
Mass
MZ-R90
Approx. 105 g (3.7 oz) the recorder only
Approx. 148 g (5.2 oz) incl. a recordable MD,
and NH-14WM nickel metal hydride
rechargeable battery
MZ-R91
Approx. 110 g (3.8 oz) the recorder only
Approx. 153 g (5.4 oz) incl. a recordable MD,
and NH-14WM nickel metal hydride
rechargeable battery
Supplied accessories
AC power adaptor (1)
Headphones with a remote control (1) (RM-MZ2S)
NH-14WM nickel metal hydride rechargeable
battery (1)
Dry battery case (1)
Rechargeable battery carrying case (1)
Carrying pouch (1)
A
C plug adaptor (1)
Design and specifications are subject to
change without notice.
MZ-R90

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  • Page 1: Specifications

    MZ-R90 Emission duration: continuous Power requirements Approx. 78.9 × 17.3 × 72.0 mm (w/h/d) Laser output: less than 44.6 µW Sony AC Power Adaptor (supplied) connected × × 2 in.) (This output is the value measured at a distance at the DC IN 3 V jack:...

  • Page 2: Table Of Contents

    OPERATION. REPLACE THESE COMPONENTS WITH DE FONCTIONNEMENT. NE REMPLACER CES COM- SONY PARTS WHOSE PART NUMBERS APPEAR AS POSANTS QUE PAR DES PIÈCES SONY DONT LES SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB- NUMÉROS SONT DONNÉS DANS CE MANUEL OU LISHED BY SONY.

  • Page 3: Servicing Notes

    SECTION 1 SERVICING NOTES • When repairing this device with the power on, if you remove NOTES ON HANDLING THE OPTICAL PICK-UP the MAIN board or open the upper panel assy, this device stops BLOCK OR BASE UNIT working. The laser diode in the optical pick-up block may suffer electro- In this case, you can work without the device stopping by fas- static break-down because of the potential difference generated tening the hook of the open/close detect switch (S801) with tape.

  • Page 4: General

    SECTION 2 This section is extracted from instruction manual. GENERAL • LOCATION OF CONTROLS – The recorder – x (stop) /CHARGE button Display window REC indicator DC IN 3V jack Jog lever i/LINE OUT (headphones/line out) jack MIC (PLUG IN POWER) jack LINE IN (OPTICAL) jack HOLD switch Slide to lock the controls of the recorder.

  • Page 5: Disassembly

    SECTION 3 DISASSEMBLY • This set can be disassembled in the order shown below. Main Board, “Case Assy, Battery” Panel Assy, Bottom Upper Panel Section LCD Module, “Button, Control”, “Service Assy, Upper Panel” (R90/R91) “Chassis Assy, Set”, Belt Assy, Ornamental Main Board, “Case Assy, Battery”...
  • Page 6 • MZ-R90 1 five screws (1.4) 2 LCD module 3 control button 4 upper panel service assy • MZ-R91 1 five tapping screws (1.7) 2 LCD module 3 control button Note: The control buttons are stuck with strong adhesive sheets.
  • Page 7 MAIN BOARD, “CASE ASSY, BATTERY” 2 flexible board (LCD module) (CN801) 2 flexible board (over write head) (CN601) 1 Remove the solder of joint. 3 four toothed lock screws (M1.4) 1 Remove the solder of battery terminal (minus). 6 main board 8 batter case assy 1 Remove the solder of 2 motor flexible board...
  • Page 8 “CHASSIS ASSY, SET”, MD MECHANISM DECK (MT-MZR90-165) 3 MD mechanism deck 2 boss (MT-MZR90-165) 2 boss 4 tension spring (arm) 1 screw (1.4) 5 set chassis assy 1 screw (1.4) SERVICE ASSY, OP 1 washer (0.8 - 2.5) 2 gear (SA) 3 precision pan screw (M1.4) 7 Pull off the lead screw.
  • Page 9 HOLDER ASSY 5 Remove the holder assy in the direction of arrow C. 1 Open the holder assy. 2 Push the convex portion toward the direction B and open the holder assy toward the direction A to erect uprightly. 4 boss MOTOR FLEXIBLE BOARD 1 Remove four solders of DC motor (sled) (M602).
  • Page 10 MOTOR, DC (SLED) (M602) 1 Remove four solders of motor flexible board. 2 washer (0.8 - 2.5) 4 two precision pan screws (M1.4) 3 gear (SA) 5 DC motor (sled) (M602) “MOTOR, DC SSM-01C14A (SPINDLE) (M601)”, “MOTOR, DC (OVER WRITE HEAD UP/DOWN) (M603)” 1 Remove six solders of motor flexible board.

  • Page 11: Test Mode

    SECTION 4 TEST MODE [Outline] 2 In the normal mode, turn on the HOLD switch on the set. While pressing the key on the set, press the following set keys • This set provides the Overall adjustment mode (Assy mode) that in the following order: allows CD and MO disc to be automatically adjusted when in the test mode.
  • Page 12 [VOL +] [Configuration of Test Mode] key:100th place of mode number [Major item switching] increase. [Test Mode $Display Check Mode%] [VOL --] key:100th place of mode number [VOL +] Press the > decrease. [Manual Mode] Press the [VOL +] key:10th place of mode number [Servo Mode] [Medium item switching] increase.
  • Page 13 [Overall Adjustment Mode] 5. The display changes a shown below each time the jog key on [DISPLAY] the set is turned up or key on the remote com- Mode to adjust the servo automatically in all items. mander is pressed. Normally, automatic adjustment is executed in this mode at the repair.
  • Page 14 [REC] [Sound Skip Check Result Display Mode] 4. When key on the set is pressed, the total of error count is displayed on the LCD, and each time the > key is This set can display and check the error count occurring during pressed, the error count descents one by one as shown below.
  • Page 15 [Self-Diagnosis Display Mode] • This set uses the self-diagnosis system in which if an error oc- curs in recording/playback mode, the error is detected by the model control and power control blocks of the microprocessor and information on the cause is stored as history in EEPROM. By viewing this history in test mode, it helps you to analyze a fault and determine its location.
  • Page 16 • Description of Indication History History code number Description 1st0 The first error 1st1 Total recording time when 1st0 was generated (Higher rank byte) 1st2 Total recording time when 1st0 was generated (Lower rank byte) The last error Total recording time when N 0 was generated (Higher rank byte) Total recording time when N 0 was generated (Lower rank byte) N-10 One error before the last.
  • Page 17 [Key Check Mode] This set can check if the set and remote commander function nor- mally. • Setting Method of Key Check Mode 1. Setting the test mode. (See page 11) [T MARK] [DISPLAY] 2. Press the key on the remote com- mander for several seconds activates the key check mode where all segments of LCD turn OFF.

  • Page 18: Electrical Adjustments

    3. Press the X key once more. • Test CD disc TDYS-1 (Part No. : 4-963-646-01) LCD display • SONY MO disc available on the market. R e s * * * • Laser power meter LPM-8001 (Part No. : J-2501-046-A) •...
  • Page 19 • Adjustment method of VC PWM Duty (L) • Adjustment method of VC PWM Duty (H) (mode number: 762) (mode number: 765) 1. Select the manual mode of the test mode, and set the mode 1. Select the manual mode of the test mode, and set the mode number 762.
  • Page 20 F : Auto adjustment finished for the items not accepted. (See page 12) 1 : Manual adjustment remains 8. If CD adjustment is OK, insert an available SONY MO disc 0 : Not adjusted yet (recorded). Right side = CD auto adjustment information At this time, be sure to turn OFF the disc protect switch.
  • Page 21 Ver 1.4 2001. 01 • MO Automatic Adjustment item [Laser Power Check] 14. When both CD and MO overall adjustments are OK, set the Connecting Location: manual mode and clear the clock data. Connection : Mode No. Description For the microprocessor version 1.20 or later, set the mode num- –...

  • Page 22: Diagrams

    MZ-R90/R91 SECTION 6 DIAGRAMS OVER WRITE HEAD DRIVE IC603 6-1. BLOCK DIAGRAM – SERVO Section – ANALOG REC ADDT OVER WRITE HR601 (Page 25) HEAD DRIVE EFMO LOGIC OVER WRITE HEAD Q601, 602 DIGITAL REC DIN1 OPTICAL PICK-UP BLOCK (Page 25) (LCX-2R) DADT, XBCK, RF AMP, FOCUS/TRACKING ERROR AMP...

  • Page 23: Block Diagram -A/D, D/A Converter, Audio Section

    MZ-R90/R91 6-2. BLOCK DIAGRAM – A/D, D/A CONVERTER, AUDIO Section – 6-3. BLOCK DIAGRAM – KEY CONTROL/DISPLAY/POWER SUPPLY Section – OPTICAL RECEIVER POWER CONTROL IC901 B+ SWITCH OVER WRITE HEAD (Page 24) VC B+ VC B+ Q302 DRIVE CIRCUIT B+ RF AMP (IC501), DSP (IC502), MOTOR/COIL DRIVE (IC601), D905...
  • Page 24 MZ-R90/R91 Ver 1.2 2000. 02 6-4. PRINTED WIRING BOARD Note on Schematic Diagram: • Semiconductor • All capacitors are in µF unless otherwise noted. pF: µµF Location 50 WV or less are not indicated except for electrolytics Ref. No. Location and tantalums.

  • Page 25: Schematic Diagram

    MZ-R90/R91 6-5. SCHEMATIC DIAGRAM • See page 38 for Waveforms. • See page 41 for IC Block Diagrams. – 33 – – 34 – – 35 – – 36 – – 37 –...
  • Page 26 • Waveforms 1 IC301 1 (MCLK), IC502 rh (FS256) 6 IC501 ed (RF), IC502 uk (RFI) (PLAY Mode) qa IC502 <zxv (SPVS), IC504 1, 2 qg IC601 ej, ek, el, r; (COM, w; IC801 yh (VC PWM) wg Q607 (Drain) 1 V/DIV, 50 ns/DIV 400 mV/DIV, 1 µs/DIV IC601 3 (PWMI), IC801 yj (SPDL PWM)
  • Page 27 IC601 MPC17A56FTA CPUO – 3PHASE CPVO CONTROL DRIVER – CPWO – H-BRIDGE H-BRIDGE PGND1 PGND3 DRIVER CONTROL CONTROL DRIVER VM12 VM34 BIAS H-BRIDGE H-BRIDGE PGND2 DRIVER CONTROL CONTROL DRIVER PGND4 PWM24 15 16 17 IC602 MPC17A17XDTBR2 OUTA OUTC CHARGE PUMP OUTB LEVEL SHIFTER...
  • Page 28 IC603 MPC18A20MTAEL CONTROL CHARGE PUMP LOGIC PRE DRIVER COMP VREF COMP DRIVER LOGIC BIAS VREF IC605 XC6367B103MR IC803 XC6383C301MR CHIP SLOW ENABLE START REFERENCE VREF VLX LIMITER LIMITER VOUT VOLTAGE BUFFER PWM/PFM PHASE BUFFER CONTROL 2STEP PFM CONTROL COMPARATOR VOUT OSC 100kHz –...
  • Page 29 IC804 RV5C348A-E2 ALARM W REGISTER VOLTAGE COMPARATOR W (WEEK,MIN,HOUR) DETECT 32KHz 32K OUT OUTPUT ALARM D REGISTER CONTROL COMPARATOR D (MIN,HOUR) OSC IN TIME COUNTER DIVIDER (SEC,MIN,HOUR,WEEK,DAY,MONTH,YEAR) CORRECTION OSC OUT SCLK ADDRESS ADDRESS DECORDER REGISTER CONTROL DETECT /INTR SHIFT REGISTER INTERRUPT CONTROL IC901 MPC18A31FTA DCIN...

  • Page 30: 6-6. Ic Pin Function Description

    6-6. IC PIN FUNCTION DESCRIPTION • MAIN BOARD IC501 SN761056ADBT (RF AMP, FOCUS/TRACKING ERROR AMP) Pin No. Pin Name Description Tracking error signal output to the CXD2660GA (IC502) REXT — Connected to the external resistor for the ADIP amplifier control WPPLPF —...
  • Page 31 • MAIN BOARD IC502 CXD2660GA (DIGITAL SIGNAL PROCESSOR, DIGITAL SERVO SIGNAL PROCESSOR, EFM/ACIRC ENCODER/DECODER, SHOCK PROOF MEMORY CONTROLLER, ATRAC ENCODER/DECODER, 16M BIT D-RAM) Pin No. Pin Name Description — VDC0 Power supply terminal (+1.8V) (for internal logic) MNT0 Not used (open) MNT1 Recording shock detect signal output to the system controller (IC801) MNT2...
  • Page 32 Pin No. Pin Name Description FS256 Clock signal (11.2896 MHz) output to the A/D, D/A converter (IC301) (X' tal system) A03, A04, A02, 47 to 52 Address signal output to the external D-RAM Not used (open) A05, A01, A06 — VDIO1 Power supply terminal (+2.4V) (for I/O) —...
  • Page 33 Pin No. Pin Name Description XLRF Serial latch signal output terminal Not used (open) CKRF Serial clock signal output terminal Not used (open) DTRF Writing data output terminal Not used (open) Control signal output to the reference voltage generator circuit for the laser automatic power APCREF control LDDR...
  • Page 34 • MAIN BOARD IC801 CXR701080-013GA (MASTER CONTROLLER) Pin No. Description Pin Name SYNC REC SYNCHRO REC switch (S801) input terminal “L”: off, “H”: on OFTRK Off track signal input from the CXD2660GA (IC502) Rec-proof claw detect input from the protect detect switch (S806) PROTECT “L”: recording possible , “H”: protect PAUSE KEY...
  • Page 35 Pin No. Description Pin Name FFCLR Input latch output for starting signal to the MPC18A31FTA (IC901) SLEEP System sleep control signal output to the MPC18A31FTA (IC901) “H”: sleep on TSB EDGE TSB slave edge detect signal input terminal GND SW Ground line switching signal output terminal System reset signal input from the MPC18A31FTA (IC901) “L”: reset XRST...
  • Page 36 Description Pin No. Pin Name Un-regulator power supply voltage monitor input terminal (A/D input) VB MON Rechargeable battery voltage monitor input from the MPC18A31FTA (IC901) (A/D input) CHG MON Reference voltage monitor input from the SN761056ADBT (IC501) (A/D input) VREF MON WK DET Set key starting detect signal input terminal (A/D input) HALF LOCK...

  • Page 37: Exploded Views

    SECTION 7 EXPLODED VIEWS NOTE: • -XX and -X mean standardized parts, so they • Items marked “*” are not stocked since they The components identified by mark 0 or dotted line with mark may have some difference from the original are seldom required for routine service.
  • Page 38 (2) PANEL SECTION (MZ-R91) chassis section not supplied not supplied Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 4-223-077-21 LID, BATTERY CASE (BLUE) X-3378-553-1 SERVICE ASSY, UPPER PANEL (L) (BLUE) 4-223-077-31 LID, BATTERY CASE (RED) X-3378-554-1 SERVICE ASSY, UPPER PANEL (R) (RED)
  • Page 39 (3) CHASSIS SECTION MT-MZR90-165 not supplied Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark X-4952-044-1 BELT ASSY (S), ORNAMENTAL (SILVER) A-3323-493-A MAIN BOARD, COMPLETE (R90: US, CND) (R90/R91) 4-223-110-01 TERMINAL (3) X-4952-337-1 BELT (B) ASSY, ORNAMENTAL (BLACK) 3-335-797-91 SCREW (M1.4), TOOTHED LOCK (R90: BLACK) 3-042-741-01 SHEET (FLEXIBLE) (R90/R91: HK, JEW)
  • Page 40 (4) MD-MECHANISM DECK SECTION (MT-MZR90-165) M602 M601 M603 The components identified by Les composants identifiés par une mark 0 or dotted line with marque 0 sont critiques pour la mark 0 are critical for safety. sécurité. Replace only with part num- Ne les remplacer que par une pièce ber specified.

  • Page 41: Electrical Parts List

    SECTION 8 MAIN ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in the • Items marked “*” are not stocked since they The components identified by mark 0 or dotted line with mark parts list may be different from the parts speci- are seldom required for routine service.
  • Page 42 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C502 1-127-772-81 CERAMIC CHIP 33000PF 10% C624 1-125-777-11 CERAMIC CHIP 0.1uF C625 1-125-777-11 CERAMIC CHIP 0.1uF C503 1-164-940-11 CERAMIC CHIP 0.0033uF 10% C626 1-117-919-11 TANTALUM CHIP 10uF 6.3V C504 1-164-940-11 CERAMIC CHIP...
  • Page 43 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C1004 1-164-939-11 CERAMIC CHIP 0.0022uF 10% @ IC502 8-752-397-66 IC CXD2660GA IC504 8-759-647-75 IC TC7W66FK (TE85R) < CONNECTOR > IC505 8-759-647-75 IC TC7W66FK (TE85R) IC601 8-759-678-83 IC MPC17A56FTAEB * CN501 1-778-168-11 CONNECTOR, FFC/FPC (ZIF) 20P * CN601...
  • Page 44 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark Q309 8-729-928-81 TRANSISTOR DTC144EE-TL R215 1-208-683-11 METAL CHIP 0.5% 1/16W Q501 8-729-928-81 TRANSISTOR DTC144EE-TL Q601 8-729-046-43 FET HAT2051T-EL R216 1-218-945-11 METAL CHIP 0.5% 1/16W Q602 8-729-046-42 FET HAT2050T-EL R217 1-208-719-11 METAL CHIP 0.5%...
  • Page 45 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R535 1-216-864-11 METAL CHIP 1/16W R840 1-216-864-11 METAL CHIP 1/16W R536 1-216-864-11 METAL CHIP 1/16W (EXCEPT R90: US, CND) R537 1-216-864-11 METAL CHIP 1/16W R901 1-219-724-11 METAL CHIP 1/4W R602 1-216-864-11 METAL CHIP...
  • Page 46 Replace only with part num- Ne les remplacer que par une pièce R91: AEP, UK, HK, JEW) ber specified. portant le numéro spécifié. Sony Corporation 2000B0586-1 9-927-187-12 Personal Audio Division Company Printed in Japan C 2000. 2 – 62 –...
  • Page 47 MZ-R90/R91 US Model Canadian Model SERVICE MANUAL Australian Model Chinese Model MZ-R90 2000. 07 AEP Model UK Model E Model Tourist Model MZ-R90/R91 SUPPLEMENT-1 File this supplement with the service manual. Subject: 1. Addition of Korean Model 2. Correction (ENG-00014)
  • Page 48 Addition of Korean Model Korean Model has been added. This is the same as Hong Kong model which is not described in this supplement-1. Refer to MZ-R90/R91 original service manual (9-927-187-S) for other information. • EXPLODED VIEWS Page Hong Kong Model Korean Model Ref.
  • Page 49 Correction EXPLODED VIEWS : Indicates changed portion. Page INCORRECT CORRECT Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-048-299-01 WASHER (LCD) chassis section chassis section Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-049-215-01 SHEET (PRO) Ref.
  • Page 50 IC901 8-759-678-82 IC MPC18A31FTAEB Q101 8-729-046-45 FET SI2302DS-T1 Q101 8-729-044-58 FET SI2304DS-T1 Q201 8-729-046-45 FET SI2302DS-T1 Q201 8-729-044-58 FET SI2304DS-T1 Sony Corporation 2000G0573-1 9-927-187-83 Audio Entertainment Group Printed in Japan C 2000. 7 – 4 – Published by PE General Engineering Dept.

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