Sony MZ-R90, MZ-R91 Service Manual

MZ-R90/R91

SERVICE MANUAL

Ver 1.2 2000. 02

Photo: MZ-R91 (Blue type)

US and foreign patents licensed from Dolby Laboratories Licensing Corporation.

SPECIFICATIONS

System

Audio playing system

MiniDisc digital audio system

Laser diode properties

Material: GaAlAs Wavelength:λ = 790 nm Emission duration: continuous Laser output: lessthan 44.6 (This output is the value measured at a distance of 200 mm from the lens surface on the optical pick-upblockwith7mmaperture.)

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 ± 3dB

Wow and Flut ter

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: max 5

mV, load impedance 16 ohm

µW

imum output level 5 mV +

LINE OUT: 194 mV,load impedance 10 kilohm

*Thei/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 NH14WM (supplied) LR6 (size AA) alkaline battery (not supplied)

Battery operation time

Batter y life

Batteries Recording2)Playback

NH-14WM nickel metal hydride rechargeable battery

LR6 (SG) (size AA) Sony alkaline dry battery

NH-14WM nickel metal hydride rechargeable battery + One LR6 (SG)

(size

Approx.

6.5 hours

Approx. 4 hours

Approx.

14.5 hours

AA)

US Model

Canadian Model

Australian Model

Chinese Model

MZ-R90

AEP Model

UK Model

E Model

Tourist Model

MZ-R90/R91

Model Name Using Similar Mechanism NEW Mechanism Type MT-MZR90-165 Optical Pick-up Name LCX-2R

The battery life may be shorter due to ope

rating conditions and the temperature of

the location.

Approx. 12 hours

Approx.

16.5 hours

Approx. 29 hour

When you record, use re

chargeable battery.

Dimensions

MZ-R90 Approx. 78.9 × 17.3 × 72.0 mm (w/h/d)

/8×11/16× 27/8in.)

MZ-R91 Approx. 78.9 × 18.0 × 72.0 mm (w/h/d)

/8×23/32× 27/8in.)

Mass

MZ-R90 Approx. 105 g (3.7 oz) the recorder only Ap

prox. 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 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 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.

a fully charged

g (5.4 oz) incl. a recordable MD,

hydride rechargeable

PORTABLE MINIDISC RECORDER

1. SERVICING NOTES............................................... 3

2. GENERAL ................................................................... 4

3. DISASSEMBLY ......................................................... 5

4. TEST MODE.............................................................. 11

5. ELECTRICAL ADJUSTMENTS......................... 18

Flexible Circuit Board Repairing

• Keep the temperature of the soldering iron around 270 ˚C during repairing.

• Do not touch the soldering iron on the same conductor of the circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering or unsoldering.

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

6. DIAGRAMS

6-1. Block Diagram –SERVO Section–................................. 23

6-2. Block Diagram –A/D, D/A CONVERTER,

AUDIO Section – ............................................................ 25

6-3. Block Diagram –KEY CONTROL/DISPLAY/

POWER SUPPLY Section – ........................................... 27

6-4. Printed Wiring Board ...................................................... 30

6-5. Schematic Diagram ......................................................... 33

6-6. IC Pin Function Description ........................................... 46

7. EXPLODED VIEWS................................................ 53

8. ELECTRICAL PARTS LIST ............................... 57

CAUTION

Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANU AL OR IN SUPPLEMENTS PUBLISHED BY SONY.

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!

LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE 0 SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

– 2 –

SECTION 1

SERVICING NOTES

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT

The laser diode in the optical pick-up block may suffer electrostatic break-down because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body. During repair, pay attention to electrostatic break-down and also use the procedure in the printed matter which is included in the repair parts. The flexible board is easily damaged and should be handled with care.

NOTES ON LASER DIODE EMISSION CHECK

Never look into the laser diode emission from right above when checking it for adjustment. It is feared that you will lose your sight.

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK (LCX-2R)

The laser diode in the optical pick-up block may suffer electrostatic break-down easily. When handling it, perform soldering bridge to the laser-tap on the flexible board. Also perform measures against electrostatic break-down sufficiently before the operation. The flexible board is easily damaged and should be handled with care.

• When repairing this device with the power on, if you remove the MAIN board or open the upper panel assy, this device stops working. In this case, you can work without the device stopping by fastening the hook of the open/close detect switch (S801) with tape.

upper panel assy

tape

S801

• This set is designed to perform automatic adjustment for each adjustment and write its value to EEPROM. Therefore, when EEPROM (IC802) has been replaced in service, be sure to perform automatic adjustment and write resultant values to the new EEPROM. (Refer to Section 5 Electrical Adjustment. (page 18))

MAIN board

laser-tap

OPTICAL PICK-UP FLEXIBLE BOARD

• Replacement of CXD2660GA (IC502) and CXR701080-013GA (IC801) used in this set requires a special tool. Therefore, they cannot be replaced.

– 3 –

• LOCATION OF CONTROLS

– The recorder –

– The display window of the recorder –

SECTION 2

GENERAL

1 x (stop) /CHARGE button 2 Display window 3 REC indicator 4 DC IN 3V jack 5 Jog lever 6 i/LINE OUT (headphones/line out) jack 7 MIC (PLUG IN POWER) jack 8 LINE IN (OPTICAL) jack 9 HOLD switch

Slide to lock the controls of the recorder.

0 N (play) button qa X (pause) button qs T MARK (track mark) button qd REC (record) switch qf Battery compartment qg VOL (volume) +/– buttons qh OPEN switch qj END SEARCH button qk ./> (search/AMS) buttons ql SYNCHRO REC (synchro-recording)

ON/OFF switch

This section is extracted from instruction manual.

3 4

– The headphones with a remote control (RM-MZ2S) –

5 6

1 Character information display

Displays the disc and track name*, date, error messages, track numbers, etc. * Disc and track names appear only

with MDs that have been electronically labeled.

2 MONO(monaural) indication 3 Disc name/track name indications

Appears when labeling disc or track respectively.

4 Play mode indication

Shows the play mode of the MD.

F (all repeat): All tracks play

F 1(single repeat): One track plays

F SHUF(shuffle repeat): Tracks will

5 SYNC (synchro-recording) indication

Lights up while synchro-recording.

6 Disc indication

Shows that the disc is rotating for recording, playing or editing an MD.

7 REC indication

Lights up while recording. Flashes when standing by for recording.

1 Headphones

Can be replaced with optional headphones.

2 Stereo mini plug 3 x (stop) button 4 Control

To play, press the control towards N•> during stop. Press the control towards N•> during play to search the beginning of the succeeding track; hold in this position to fast-forward. Press towards . during play to search the beginning of the preceeding track; hold in this position to rewind.

5 HOLD switch

Slide to lock the controls of the remote control.

6 X (pause) button 7 PLAY MODE button 8 DISPLAY button 9 VOL (volume) +/– buttons

When the AVLS is set to on, you cannot increase the volume to the maximum. To increase the volume above the limited level, set the AVLS to off using the jog lever.

0 Display window

repeatedly.

be repeated in random order.

8 Mega bass indication 9 Battery indication

Shows approximate battery condition. While charging the rechargeable battery, this indication shows the charging condition.

0 REMAIN (remaining time/tracks)

indication Lights up along with the remaining time of the track, remaining time of the MD, or remaining number of tracks.

qa REC DATE (recorded/current date)

indication Lights up along with the date and time the MD was recorded. When only “DATE” lights up, the current date and time are displayed.

qs Time display

Shows the elapsed time of the track being recorded or played.

qd Level meter

Shows the level of the MD being played or recorded.

qf AM/PM indication

Lights up along with the time indication in the 12-hour system.

– 4 –

DISASSEMBLY

• This set can be disassembled in the order shown below.

Main Board, “Case Assy, Battery”

SECTION 3

Set

Note: Follow the disassembly procedure in the numerical order given.

Panel Assy, Bottom

Belt Assy, Ornamental

Service Assy, OP

Motor Flexible Board

Motor, DC (Sled) (M602)

“Motor, DC SSM-01C14A (Spindle) (M601)”, “Motor, DC (Over Write Head Up/Down) (M603)”

Upper Panel Section

Main Board, “Case Assy, Battery”

Holder Assy

PANEL ASSY, BOTTOM

Note: On installation of bottom

panel assy, adjust the position of both two switches (S804, S807) and two knobs (hold).

S807

S804

LCD Module, “Button, Control”, “Service Assy, Upper Panel” (R90/R91)

“Chassis Assy, Set”, MD Mechanism Deck (MT-MZR90-165)

3 battery case li

1 Open the

battery case lid.

4 Close the

battery terminal (plus).

2 two claws

5 two screws

(1.4)

UPPER PANEL SECTION

4 two screws

(1.4)

knob (hold)

5 two screws

(1.4)

6 Remove the bottom panel assy

5 screw (1.4)

in the direction of arrow A.

5 upper panel section

4 two screws

(1.4)

1 flexible boar

(CN801)

2 knob (open)

– 5 –

LCD MODULE, “BUTTON, CONTROL”, “SERVICE ASSY, UPPER PANEL”

• MZ-R90

3 control button

4 upper panel service assy

1 five screws

(1.4)

2 LCD modul

• MZ-R91

3 control button

Note: The control buttons are stuck with

strong adhesive sheets. As the control buttons are very fragile, do not peel them off forcibly.

1 five tapping screws

(1.7)

2 LCD module

5 upper panel service ass

4 adhesive sheet

(control button)

Note: Also replace the adhesive sheets (control button),

when replacing the control buttons and upper panel service assy.

– 6 –

MAIN BOARD, “CASE ASSY, BATTER Y”

2 flexible board (over write head)

(CN601)

2 flexible board (LCD module)

(CN801)

3 four toothed lock screws

(M1.4)

6 main board

1 Remove the solder of

battery terminal (plus).

5 flexible board

(optical pick-up) (CN501)

Note: Before removing the flexible board

from CN501, be sure to solder the flexible board. (Refer to servicing notes (NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK (LCX-2R)) page 3.)

1 Remove the solder of joint.

1 Remove the solder of

battery terminal (minus).

8 batter case assy

2 motor flexible board

(CN602)

7 four bosses

BELT ASSY, ORNAMENTAL

Note: As the ornamental belt assy

is very fragile, do not give an excessive force to the entire assy when removing it.

6 Remove the ornamental belt assy in the direction of arrow C.

3 three bosses

)

boss

)

2 Open toward the direction B

to disengage two bosses and convex portions pointed

with

4 knob (open)

)

boss

1 Pull toward the direction A

to disengage two bosses .

)

2 Open toward the direction B

to disengage two bosses and convex portions pointed

with

boss

5 two bosses

boss

– 7 –

“CHASSIS ASSY, SET”, MD MECHANISM DECK (MT-MZR90-165)

2 boss

3 MD mechanism deck

(MT-MZR90-165)

2 boss

4 tension spring (arm)

1 screw (1.4)

5 set chassis ass

1 screw (1.4)

SERVICE ASSY, OP

3 precision pan screw

(M1.4)

4 rack spring

5 screw

8 bearing

1 washer (0.8 - 2.5)

2 gear (SA)

5 screw

7 Pull off the lead screw.

9 Opening the over write head

toward the direction A, remove th OP Service assy toward the direction B. Note: Do not open the entire assy

forcibly, when opening the over write head.

over write head section

– 8 –

HOLDER ASSY

1 Open the holder assy.

5 Remove the holder assy in the

direction of arrow C.

2 Push the convex portion

toward the direction B and open the holder assy toward the direction A to erect uprightly.

MOTOR FLEXIBLE BOARD

1 Remove four solders of

DC motor (sled) (M602).

2 adhesive sheet

Note: Align a circular hole in the stripping paper

with a circular hole in the DC motor (sled), when mounting the motor flexible board.

4 boss

1 Remove two solders of

DC motor (over write head up/down) (M603).

1 Remove four solders of

DC motor (spindle) (M601).

3 motor flexible board

DC motor (sled) circular hole

– 9 –

MOTOR, DC (SLED) (M602)

1 Remove four solders of

motor flexible board.

4 two precision pan screws

(M1.4)

5 DC motor (sled) (M602)

2 washer (0.8 - 2.5)

3 gear (SA)

“MOTOR, DC SSM-01C14A (SPINDLE) (M601)”, “MOTOR, DC (OVER WRITE HEAD UP/DOWN) (M603)”

1 Remove six solders of

motor flexible board.

4 three precision pan screws

(M1.4)

qa DC motor (over write head up/down)

(M603)

6 two precision pan screws

(M1.4)

qs gear chassis assy

9 screw

(M1.2 × 1.5)

Note: Press-fit the gear (HA) up to the

position of the DC motor (over write head up/down) (M603) as shown below.

gear (HA)

2.65 mm

gear chassis assy

DC motor (over write head up/down) (M603)

0 gear (HA)

8 gear (HB)

7 washer (0.8 - 2.5)

2 washer (0.8 - 2.5)

3 gear (HC)

5 DC motor

(spindle) (M601)

– 10 –

SECTION 4

TEST MODE

[Outline]

• This set provides the Overall adjustment mode (Assy mode) that allows CD and MO disc to be automatically adjusted when in the test mode. In this overall adjustment mode, the protect switch is detected to judge the disc, CD or MO, and each adjustment is automatically executed in order. If a fault is found, the system displays its location. Also, the manual mode allows each individual adjustment to be automatically adjusted.

• The keys in the description refer to the keys on both set and remote commander unless otherwise specified. Though LCD display shows the LCD of the remote commander, same contents are also displayed on the LCD of the set.

[Setting Method of Test Mode]

There are two different methods to set the test mode: 1 Short BP801 (TEST) on the MAIN board with a solder bridge

(connect pin y; of IC801 to the ground). Then, turn on the power.

– MAIN BOARD (Conductor Side) –

2 In the normal mode, turn on the HOLD switch on the set. While

pressing the N key on the set, press the following set keys in the following order:

> t > t . t . t > t . t

> t . t X t X

[Operation in Setting the Test Mode]

• When the test mode becomes active, first the display check mode is selected. (Press x key once, when the display check mode is not active.)

• Other mode can be selected from the display check mode.

• When the test mode is set, the LCD repeats the following display.

LCD display

All lit

All off

Microprocessor version display

888

xxxxxxxxx

001

V0.000

F1SHUF

REC

• When the X key is pressed and hold down, the display at that time is held so that display can be checked.

[Releasing the Test Mode]

For test mode set with the method 1: Turn off the power and open the solder bridge on BP801 (TEST) on the MAIN board.

Note: Remove the solders completely. Remaining could be shorted with

the chassis, etc.

For test mode set with the method 2: Turn off the power.

Note: If electrical adjustment (see page 18) has not been finished com-

pletely, always start in the test mode. (The set cannot start in normal mode.)

BP801 Short: Test Mode Open: Normal Mode

)(

– 11 –

[Configuration of Test Mode]

[Test Mode $Display Check Mode%]

Press the

[VOL +]

key

[Manual Mode]

Press the

key

[VOL --]

key

[Overall Adjustment Mode]

Press the

key

[Servo Mode] [Audio Mode] [Power Mode]

[OP Alignment Mode]

[Major item switching]

key x key

[Medium item switching]

key

[Minor item switching]

[VOL +]

[VOL --]

key:100th place of mode number

increase.

key:100th place of mode number

decrease.

[VOL +]

[VOL --]

key:10th place of mode number

increase.

key:10th place of mode number

decrease.

key: Unit place of mode number

increase.

Press the

key

[REC]

key on the set

[Sound Skip Check Result Display Mode]

Move up the jog key on the set or press the on the remote commander

[DISPLAY]

key

[Self-Diagnosis Display Mode]

Press the

on the remote commander for several seconds.

key

[T MARK]

[DISPLAY]

key

[Key Check Mode]

Quit the key check or open the upper panel

[Manual Mode]

Mode to adjust or check the operation of the set by function. Normally, the adjustment in this mode is not executed.

• Transition method in Manual Mode

1. Setting the test mode. (See page 11)

2. Press the where the LCD display as shown below.

> or [VOL +] key activates the manual mode

LCD display

000

Manual

[Adjusted value variation]

[VOL +]

[VOL --]

key:Increases the

adjusted value

key:Decreases the

adjusted value

[Adjusted value write]

key: When adjusted value is

changed: Adjusted value is written. When adjusted value is not changed: That item is adjusted automatically.

3. The optical pick-up moves outward or inward while the > or . key is pressed for several seconds respectively.

4. Each test item is assigned with a 3-digit mode number; 100th place is a major item, 10th place is a medium item, and unit place is a minor item.

– 12 –

5. The display changes a shown below each time the jog key on the set is turned up or [DISPLAY] key on the remote commander is pressed.

• Address & Adjusted Value Display

LCD display

011

C68S01

address

mode number

• Jitter Value & Adjusted Value Display

LCD display

011

0FFJ01

jitter value

mode number

• Block Error Value & Adjusted Value Display

LCD display

011

063B01

block error value

mode number

• ADIP Error Value & Adjusted Value Display

LCD display

011

059A01

ADIP error value

mode number

• Item Title Display

LCD display

011

LrefPw 01

adjusted value

[Overall Adjustment Mode]

Mode to adjust the servo automatically in all items. Normally, automatic adjustment is executed in this mode at the repair. Adjust the CD first, when performing adjustment.

• Configuration of overall adjustment

> key . key

Title

display

N key

protect switch ON

protect switch OFF

x key

CD overall

adjusting

All item

CD overall

adjustment

MO overall

adjusting

MO overall

adjustment

> key

NG item exists

x key

CD overall adjustment

NG item exists or

x key

MO overall adjustment

[Test mode $display check mode%]

For further information, refer to the Section 5 Electrical Adjustment. (See page 18)

item title

mode number

However in the power mode (mode number 700’s), only the power adjustment value is displayed.

• Power Supply Adjusted Value

LCD display

731

AD 85

fixed display

mode number

6. Quit the manual mode, and press mode (display check mode).

adjusted value

x key to return to the test

– 13 –

[Sound Skip Check Result Display Mode]

This set can display and check the error count occurring during record and play.

• Setting method of Sound Skip Check Result Display Mode

1. Setting the test mode. (See page 11)

2. Press the N or [REC] key on the set activates the sound skip

check result display mode where the LCD displays as shown below. If microprocessor version is 1.20 When N key is pressed:

LCD display

000

Stat**

Total of play system error count

When [REC] key on the set is pressed:

LCD display

000

Rtry**

Total of record system error count

If microprocessor version is 1.30 or later When N or [REC] key on the set is pressed:

LCD display

000

P**R**

Total of record system error count

Total of play system error count

3. When

N key is pressed, the total of error count is displayed

on the LCD, and each time the > key is pressed, the error count descents one by one as shown below. Also, when . key is pressed, the error count ascends by one. If

[REC] key on the set is pressed, the error count during record

is displayed.

4. When [REC] key on the set is pressed, the total of error count is displayed on the LCD, and each time the > key is pressed, the error count descents one by one as shown below. Also, when . key is pressed, the error count ascends by one. If N key is pressed, the error count during play is displayed.

If microprocessor version is

1.20.

000

Rtry**

000

######

000

BOvr**

000

Bful**

: Sound skip check items counter (hexadecimal)

######

: 6-digit address (hexadecimal) where a sound skipped last

If microprocessor version is

1.30 or later.

000

P**R**

000

BOvr**

000

Bful**

000

Rtry**

000

######

Error code

Cause of error Description of error

EIB Sound error correction error

Playback

Recording BFul Buffer capacity lowers and data are

Stat Decorder status error Adrs Cannot access the address BEmp Buffer becomes empty BOvr Buffer becomes full and sounds are

dumped

forcibly written

Rtry Retry count over

5. Quit the sound skip check result display mode, and press the x key to return to the test mode (display check mode).

If microprocessor version is

1.20.

000

Stat**

000

BEmp**

000

######

000

EIB **

: Sound skip check items counter (hexadecimal)

######

: 6-digit address (hexadecimal) where a sound skipped

last

If microprocessor version is

1.30 or later.

000

P**R**

000

EIB **

000

Stat**

000

Adrs**

000

BEmp**

000

######

– 14 –

+ 32 hidden pages

Sony MZ-R90, MZ-R91 Service Manual

TABLE OF CONTENTS

SERVICING NOTES

GENERAL

DISASSEMBLY

TEST MODE