Sony MZ-E75 Service manual

MICROFILM

MZ-E75

SERVICE MANUAL

Ver 1.1 2000.01

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 =790nm Emission duration : continuous

Laser output : less than 44.6 µW* * This output is the value measured at a distance of 200 mm from the

objective lens surface on the optical pick-up block with 7mm aperture.

Revolutions

400 rpm to 900 rpm (CLV)

Error correction

Advanced Cross Interleave Reed Solomon Code (ACIRC)

Sampling frequency

44.1kHz

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

Outputs

Headphones : stereo mini-jack, maximum output level 5mW+5mW, load impedance 16 ohm

US Model

AEP Model

UK Model

Australian Model

E Model

Tourist Model

Model Name Using Similar Mechanism NEW MD Mechanism Type MT-MZE75-167 Optical Pick-up Mechanism Type ODX-1B

Battery operation time

Batteries Playback Ni-MH Approx. Rechargeable battery (NH-14WM) 16 hours

One LR6 (size AA) Approx. Sony alkaline batteries 22 hours One LR6 (size AA) and a Approx. Ni-MH (NH-14WM) 42 hours Ni-CD Approx. Rechageable battery (NC-6WM) 8 hours One LR6 (size AA) and a Approx. Ni-CD (NC-6WM) 32 hours

Dimensions

Approx. 86 x 16.3 x 75.4 mm (w/h/d) not including projecting parts and controls

Mass

Approx. 98 g the player only Approx. 141 g incl. a premastered MD and a nickel metal hydride rechargeable battery NH-14WM (N)

Supplied accessories

Battery charger (1) Rechargeable battery (1) Rechargeable battery carrying case (1) Headphones with a remote control (1) Dry battery case (1) Carrying pouch (1) AC plug adaptor (E, Tourist model) (1)

Design and specifications are subject to change without notice.

General

Power requirements

Nickel metal hydride rechargeable battery NH-14WM (supplied) One LR6 (size AA) alkaline battery (not supplied) Sony AC Power Adaptor (not supplied) connected at the DC IN

1.5V jack

PORTABLE MINIDISC PLAYER

TABLE OF CONTENTS

Specifications ........................................................................... 1

1. SERVICING NOTE...................................................... 2

2. GENERAL

Location and Function of Controls .................................... 3

3. DISASSEMBLY

3-1. Upper Panel ASSY, “Panel ASSY, Bottom” ............... 4

3-2. Belt, Ornamental......................................................... 4

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

3-4. Optical Pick-up Block ASSY ..................................... 5

4. TEST MODE.................................................................. 6

5. ELECTRICAL ADJUSTMENTS............................. 9

This Mini Disc player is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT label is located on the bottom exterior.

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.

CAUTION

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

6. DIAGRAMS

6-1. Explanation of IC Terminals..................................... 10

6-2. Block Diagram.......................................................... 13

6-3. Printed Wiring Boards .............................................. 16

6-4. Schematic Diagram................................................... 19

7. EXPLODED VIEWS

7-1. Main Section............................................................. 26

7-2. Mechanism Deck Section ......................................... 27

8. ELECTRICAL PARTS LIST................................... 28

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.

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.

SECTION 1

SERVICING NOTE

When repairing this device with the power on, if you remove the main board, this device stops working. In this case, you work without the device stopping by fastening the hook of the Open/Close detection switch (S801).

Mechanism deck section

* Replacement of CXD2661GA-2 (IC601) used

Open/Close detection switch (S801)

– 2 –

in this set requires a special tool. Therefore, it cannot be replaced.

LOCATION AND FUNCTION OF CONTROLS

Main Unit

SECTION 2

GENERAL

1 i 1 jack 2 OPEN button 3 OPERATE indicator 4 > B button 5 . button 6 x button 7 i 2 jack

qa`

8 VOLUME + button 9 VOLUME – button q; External battery terminal (+/–) qa DIGITAL SOUND PRESET switch qs AVLS switch qd HOLD switch

Headphones with Remote Control

1 Headphones 2 x button 3 B >/. button 4 VOL +/– button 5 DISPLAY button

3 2 1

6 PLAYMODE button 7 DISPLAY window 8 X button 9 HOLD . switch

– 3 –

DISASSEMBLY

)

The equipment can be removed using the following procedure.

SECTION 3

set Upper panel ASSY, “Panel ASSY, bottom” Belt, Ornamental

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

3-1. UPPER PANEL ASSY, “PANEL ASSY, BOTTOM”

Upper panel ASSY

Screw (1.7)

Main unit

Claw

Main board

Screws (1.4)

Press the OPEN button

Optical pick-up block ASSY

Screws (1.4

3-2. BELT, ORNAMENTAL

Move it away

from projection

Claw

Panel ASSY, bottom

Belt, ornamental

– 4 –

Main uni

3-3. MAIN BOARD

Screws (M1.4 toothed lock)

Main board

Screw (HP), step

CLV fexble board

3-4. OPTICAL PICK-UP BLOCK ASSY

OP flexible board

Optical pick-up block ASSY

Main unit

OP flexble board

Shaft (Main)

Screw (M1.4) precision pan

Double sided

adhesive tape

OP flexible board

Note : Put the OP flexible board to a correct

Chissis ASSY

position of chassis ASSY.

– 5 –

SECTION 4

R818

SP806

8 V

TEST MODE

Outline

• In this set, overall adjustment mode is made available by entering test mode to perform automatic adjustment of CD and MO. In the overall adjustment mode, the disc is determined whether it is CD or MO and adjustments are performed in sequence. If a fault is found, the location of the fault is displayed. Also, in serv o mode, each adjustment can be automatically made.

• Operation in the test mode is performed with the Remote Commander. A key having no particular description in the te xt, indicates a Remote Commander key.

Setting the Test Mode

To enter the test mode, two methods are available :

1. Entering method with key input. Turn on the HOLD switch on the set. While holding down the x key on the set, press the following remote commander keys in the following order :

B/> t B/> t . t . t B/> t .t B/> t . t X t X

2. Entering method by shorting the test point Solder bridge the test point TAP805 (TEST) on the main board (connect IC801 pin ed to GND), and turn on the POWER.

[MAIN BOARD] (SIDE B)

TP8061

356540

TP852

C565

SP805

UME+

R807

X801

SP804

R802

R801

R808

R804

IC801

RB801

TAP805

(TEST)

218025

C805

Test mode

Short : Test mode Open : Normal mode

Releasing the Test Mode

1. When test mode was entered with key input, turn off the PO WER.

2. When test mode was entered by shorting the test point, turn off the POWER and open the solder bridge of TAP805 (TEST MODE) on the main board.

Operation of Setting on Test Mode

When the test mode is set, the LCD displays the following :

100V1. 000

LCD on remote commander

ROM version display

• The cycle - the abo ve R OM version display t All lit t All off

- is repeated. (The ROM version is constantly displayed.)

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

TP811

RB802

SHUF

DIGITAL S

LIMIT

Configuration of Test Mode

The test mode has the configuration given below.

VOL + key

x key

Overall adjustment mode (Auto?)

VOL – key

x key

Display when test mode

is set

Adjustment mode (Manu ?)

Displays of the LCD on the remote commander are shown in parentheses.

x key

B/>

key

B/> key

(044 Start ?)

x key

Servo mode

0 0 0

Audio mode

1 0 0

Power mode

3 0 0

+, – keys

VOL +, – keys

Servo Mode

• Set the test mode, press the V OLUME – ke y and use the B/> key to set the servo mode.

• When the servo mode is set, use the B/> key and the . key to move the optical pick-up to the outer circumference and to the inner circumference respectively.

• When entering another mode, refer to the configuration of test mode.

1. Structure of Servo Mode

S A

Servo mode

0 0 0

x key

B/> key

Offset adjustment

0 1 0

VOL

+, – keys

Laser power

adjustment

VOL

+, – keys

(See page 7.)

B/> key

011 to 013

x key

B/> key

0 2 0

021 to 023

x key

*1 Repeatedly press B/> key

to change the mode. (Refer to the following list for a description of each mode.)

B/> key

B/> key

– 6 –

(See page 6.)

x key

MO adjustment

0 3 0

VOL

+, – keys

Low reflection

CD adjustment

0 4 0

VOL

+, – keys

CD adjustment

0 5 0

VOL

+, – keys

Sled movement

0 6 0

x key

B/> key

031 to 039,

03a to 03c

B/> key

041 to 047

B/> key

051 to 059,

B/> key

05a to 05c

B/> key

2. Description of Each Mode 010 Offset adjustment

Mode Description

011 VC offset, FE offset, ABCD offset 012 Not used 013 Not used

020 Laser power adjustment

Mode Description

021 MO power (GRV) 022 MO power (LPIT) 023 CD power (HPIT)

030 MO adjustment

Mode Description

031 MO EF balance 032 MO EF gain 033 MO ABCD gain 034 MO focus gain 035 MO tracking gain 036 MO RF gain 037 –––––––––––– 038 –––––––––––– 039 ––––––––––––

(03a) –––––––––––– (03b) –––––––––––– (03c) ––––––––––––

x key

VOL

+, – keys

Automatic

adjustment

0 7 0

VOL

+, – keys

NV relation

0 9 0

VOL

+, – keys

Retern the Offset adjustment (0 1 0)

x key

061 , 062

B/> key

071 to 072

B/> key

091 to 093

B/> key

*1 : Repeatedly press B/> key

to change the mode. (Refer to the following list for a description of each mode.)

040 Lower reflection CD adjustment

Mode Description

041 Lower reflection CD EF balance 042 Lower reflection CD tracking offset 043 Lower reflection CD ABCD gain 044 Lower reflection CD focus gain 045 Lower reflection CD tracking gain 046 Lower reflection CD focus bias 047 ––––––––––––

050 CD adjustment

Mode Description

051 CD EF balance 052 CD tracking offset 053 CD ABCD gain 054 CD focus gain 055 CD tracking gain 056 CD focus bias 057 –––––––––––– 058 –––––––––––– 059 ––––––––––––

(05a) –––––––––––– (05b) –––––––––––– (05c) ––––––––––––

– 7 –

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