SONY MZR37 - Service Manual Immediate Download

MICROFILM

MZ-R37

SERVICE MANUAL

PORTABLE MINIDISC RECORDER

SPECIFICATIONS

US Model

Canadian Model

AEP Model

UK Model

E Model

Australian Model

Tourist Model

Model Name Using Similar Mechanism

MZ-R55

MiniDisc Mechanism Type

MT-MZR37-161

Optical Pick-up Type

KMS-280A

US and foreign patents licensed from Dolby Laboratories

Licensing Corporation.

System

Audio playing system

MiniDisc digital audio system

Laser diode properties

Material: GaAlAs

Wavelength:

= 780 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 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

Frequency response

20 to 20,000 Hz ± 3 dB

Wow and Flutter

Below measurable limit

Inputs

MIC (PLUG IN POWER): stereo mini-jack,

0.351.38 mV

(OPTICAL) LINE IN: stereo mini-jack with

optical (digital) in

· Line in: 69194 mV

· Optical (digital) in: wave length 660 nm

Outputs

PHONES/REMOTE: 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 or greater

General

Power requirements

Sony AC Power Adaptor (supplied)

connected at the DC IN 4.5 V jack:

120 V AC, 60 Hz (US, Canadian model)

220230 V AC, 50/60 Hz (AEP model)

230240 V AC, 50 Hz (UK model)

240 V AC, 50 Hz (Australian and New Zealand model)

Two nickel-cadmium rechargeable batteries

NC-AA (supplied)

Two LR6 (size AA) alkaline batteries (not supplied)

Continued on next page

Ver 1.1 1999. 04

Battery operation time1)

Batteries

Recording2)

Playback

Two NC-AA

Approx.

nickel-cadmium

3 hours

5 hours

rechargeable batteries

Two LR6 (size AA)

Approx.

Sony alkaline dry batteries

13 hours

1)The battery life may be shorter due to

operating conditions and the temperature

of the location.

2) When you record, use fully charged

rechargeable batteries.

3) Recording time may differ according to the

alkaline batteries.

Dimensions

Approx. 116.8

× 18.5 × 86.1 mm (w/h/d)

(4 5/8

× 3/4 × 3 1/2 in.)

Mass

Approx. 160 g (5.6 oz) the recorder only

Approx. 220 g (7.8 oz) incl. a recordable MD,

and two NC-AA nickel-cadmium

rechargeable batteries

Supplied accessories

Optical cable (1) (MC-918)

AC power adaptor (1) (AC-MZR37)

Headphones with a remote control (1) (SZR-S17)

NC-AA nickel-cadmium rechargeable batteries (2)

Rechargeable battery carrying case (1)

Design and specifications are subject to change without notice.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK

! OR DOTTED LINE WITH

MARK

! 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 MANUAL OR IN

SUPPLEMENTS PUBLISHED BY SONY.

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

damaged by heat.

Precautions for Laser Diode Emission Check

When checking the emission of the laser diode during adjust-

ments, never view directly downwards as this may lead to

blindness.

Precautions for Using Optical Pick-up (KMS-280A)

As the laser diode inside the optical pick-up damages by static

electricity easily, solder the laser tap of the Optical pick-up

flexible board when handling. Also take the necessary measures

to prevent damages by static electricity. Handle the Optical pick-

up flexible board with care as it breaks easily.

Laser tap

Optical Pick-up flexible board

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!!

LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE

! 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.

CAUTION

Use of controls or adjustments or performance of procedures

other than those specified herein may result in hazardous

radiation exposure.

IN NO EVENT SHALL SELLER BE

LIABLE FOR ANY DIRECT,

INCIDENTAL OR CONSEQUENTIAL

DAMAGES OF ANY NATURE, OR

LOSSES OR EXPENSES RESULTING

FROM ANY DEFECTIVE PRODUCT

OR THE USE OF ANY PRODUCT.

"MD WALKMAN" is a trademark of Sony

Corporation.

This MiniDisc player is classi-

fied as a CLASS 1 LASER

product.

The CLASS 1 LASER

PRODUCT label is located on

the bottom exterior.

1. GENERAL

Looking at the controls ...................................................... 4

2. SELF-DIAGNOSTIC

2-1. General ............................................................................... 5

2-2. Test Mode Setting .............................................................. 5

2-3. Operation in Test Mode Setting ......................................... 5

2-4. Releasing the Test Mode .................................................... 5

2-5. Self-Diagnostic Mode ........................................................ 5

2-6. Clearing the Error Indication Code

and Total Recording Time .................................................. 6

3. DISASSEMBLY

3-1. Panel, Bottom ..................................................................... 7

3-2. Panel (SV) Assy, Front ....................................................... 7

3-3. LCD Module ...................................................................... 8

3-4. Connector ........................................................................... 8

3-5. Main Board ........................................................................ 9

3-6. Panel (SV) Assy, Upper ..................................................... 9

3-7. Cabinet (SV) Assy ........................................................... 10

3-8. OP Block Assy ................................................................. 10

3-9. Holder Assy ...................................................................... 11

TABLE OF CONTENTS

4. TEST MODE

4-1. General ............................................................................. 12

4-2. Test Mode Setting ............................................................ 12

4-3. Test Mode Structure ......................................................... 12

4-4. Manual Mode ................................................................... 12

4-5. Overall Adjustment Mode (Assy Mode) .......................... 15

4-6. Hybrid Mode, Key Check Mode ...................................... 16

5. ELECTRICAL ADJUSTMENTS ........................... 17

6. DIAGRAMS

6-1. IC Pin Descriptions .......................................................... 20

6-2. Block Diagram Servo Section .................................... 25

6-3. Block Diagram Audio Section ................................... 27

6-4. Block Diagram System Control Section .................... 29

6-5. Printed Wiring Board ....................................................... 31

6-6. Schematic Diagram Main Section (1/3) ..................... 35

6-7. Schematic Diagram Main Section (2/3) ..................... 38

6-8. Schematic Diagram Main Section (3/3) ..................... 41

7. EXPLODED VIEWS

7-1. Panel Section .................................................................... 49

7-2. Cabinet (SV) Assy Section .............................................. 50

7-3. Mechanism Deck Section ................................................ 51

8. ELECTRICAL PARTS LIST ................................... 52

SERVICING NOTE

1) 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 OPEN1 switch (S801) with tape.

2) This set is designed to perform automatic adjustment for each

adjustment and write its value to EEPROM. Therefore, when

EEPROM (IC803) has been replaced in service, be sure to per-

form automatic adjustment and write resultant values to the new

EEPROM.

Refer to page 12 for details.

panel assy, upper

MAIN board

tape

S801

SECTION 1

GENERAL

This section is extracted from

instruction manual.

SECTION 2

SELF-DIAGNOSTIC

2-1. GENERAL

This set uses the self-diagnostic system in which if an error occurs

in playback/recording mode, the error is detected by the model

control and power control blocks of the microprocessor and infor-

mation 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.

2-2. TEST MODE SETTING

There are two different methods to set the test mode:

1 Short BP801 (TEST) on the main board with a solder bridge

(connect pin @§ of IC801 to the ground). Then, turn on the

power.

2 In the normal mode, use the keys on the unit to perform the

following operations:

Press and hold down

( and press the keys below in this turn:

n + n =n = n + n = n + n

n P n P

2-3. OPERATION IN TEST MODE SETTING

When the test mode is set, the LCD shows repeated cycles of the

following display:

1) Unit LCD

2) Remote controller LCD

· Holding down P allows the current display to be maintained

while it being depressed.

2-4. RELEASING THE TEST MODE

For test mode set with the method 1:

Turn off the power and open the solder bridge on BP801 on the

main board.

For test mode set with the method 2:

Turn off the power.

2-5. SELF-DIAGNOSTIC MODE

1. Go into the test mode.

2. With the unit LCD indicators all flashing, press DISPLAY key

to go into the self-diagnostic mode.

3. Then, each time

) key is pressed, the reference information

display changes as given below.

· Press = key to go back to the previous display.

C401

X801

IC801

IC301

BP801

(TEST)

MAIN BOARD (SIDE B)

All ON

All OFF

Microprocessor

version

display

Vr. 1.00

188:88 pppppp

1st

N-1

N-2

XXXX

(return)

888

Vr. 1.,,

All ON

All OFF

Microprocessor

version

display

Error indication code

History code

1st0 00