Sony MZE-25 Service manual

MZ-E25

SERVICE MANUAL

US and foreign patents licensed from Dolby
Laboratories Licensing Corporation.

SPECIFICATIONS

US Model

Canadian Model

AEP Model

UK Model

E Model

Austr alian Model

Model Name Using Similar Mechanism NEW
Mechanism Type MT-MZE35-140
Optical Pick-up Name ODX-1B

MICROFILM

PORTABLE MINIDISC PLAYER

TABLE OF CONTENTS

1. GENERAL ................................................................... 3

2. DISASSEMBLY ......................................................... 5

3. TEST MODE.............................................................. 9

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.

4. ELECTRICAL ADJUSTMENTS......................... 12

5. DIAGRAMS

5-1. Block Diagram ................................................................ 14

5-2. Printed Wiring Board ...................................................... 16

5-3. Schematic Diagram ......................................................... 19

5-4. IC Pin Function Description ........................................... 28

6. EXPLODED VIEWS ................................................ 31

7. ELECTRICAL PARTS LIST ............................... 33

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.

CAUTION

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

This MiniDisc player is classified as a CLASS 1
LASER product.
The CLASS 1 LASER PRODUCT lavel is located
on the rear exterior.

– 2 –

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.

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!

LES COMPOSANTS IDENTIFIÉS P AR 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.

SECTION 1

GENERAL

This section is extracted from
instruction manual.

– 3 –

– 4 –

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

s

SET UPPER LID ASS’Y

SECTION 2

DISASSEMBLY

BOTTOM
PANEL ASS’Y

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

MAIN BOARD ORNAMENTAL

UPPER LID ASS’Y

2

precision screw
(M1.4)

1

Moving the knob (OPEN) in the direction A,
open the upper LID ass’y.

A

BELT ASS’Y

MECHANISM
DECK SECTION
(MT-MZE35-140)

2

precision screw
(M1.4)

3

upper LID ass’y

2

two precision screws
(M1.4)

OPTICAL PICK-UP
(ODX-1B)
SECTION ASS’Y

BOTTOM PANEL ASS’Y

Note on installation:

When mounting, shift S301, S802, and S805 in
the arrow direction, then shift the knobs (HOLD),
(DOLBY), and (OPEN) in the arrow direction so
as to adjust each knob and switch position.

knob (HOLD)

1

two precision screws
(M1.4)

3

collar (DC IN)

knob (DOLBY)

S802

2

bottom panel ass’y

S301

knob (OPEN)

1

two precision screw
(M1.4)

1

two precision screws
(M1.4)

– 5 –

S805

MAIN BOARD

t

d

1

battery case lid

4

two precision screws
(M1.4)

3

two screws
(M1.4

3

two screws
(M1.4

×

×

2)

2)

2

switch uni
(CN801)

7

flexible board

(CN501)

5

Open the MAIN board

to the arrow direction.

6

flexible board (CLV)

(CN551)

8

MAIN boar

– 6 –

ORNAMENTAL BELT ASS’Y

1

boss

1

boss

2

Expand ornamental belt ass’y in the

arrow direction to remove.

1

boss

1

boss

1

boss

MECHANISM DECK SECTION (MT-MZE35-140)

1

two screws (MD)

1

boss

2

Set chassis ass’y

– 7 –

3

mechanism deck section

(MT-MZE35-140)

OPTICAL PICK-UP (ODX-1B) SECTION ASS’Y

w

3

optical pick-up (ODX-1B)

section ass’y

2

flexible board

4

main shaft

1

precision scre

– 8 –

SECTION 3

TEST MODE

General

• In the TEST mode, this set provides the Auto mode in which
both CD and MO are adjusted automatically . In the Auto mode,
whether a disc is CD or MO is discriminated, then each
adjsutment is automatically executed sequentially. If a fault is
found, it is displayed. Also, in the Serv o mode, each item can be
adjusted automatically.

Entering TEST Mode

To enter the TEST mode, the following two methods are avail­able:
Method-1. Entry by key input
Turn on the HOLD switch on the main set, and while pressing
p key on the main set, press the following keys on the remote
controller in this order.

+ →+ →= →= →+ →= →+ →= →
P→P

Method-2. Entry by shorting the test point
Bridge the TAP801 (TEST) with a solder (connect IC801 #™ to
GND) on the MAIN board, turn on the POWER switch, and press
( key.

Releasing TEST Mode

1. Turn off the POWER switch.

2. Remove the solder bridge form TAP801 (TEST) on the MAIN

board. (This is required only when using Method-2.)

Operation in TEST Mode

In the TEST mode, the Remote controller LCD display is as shown
below:

Configuration of TEST Mode

The TEST mode configuration of this set is as follows:

+key

p

key

–key

p

key

Display in TEST Mode

AUTO Mode

Auto?

MANUAL

Mode

Manu?

(

key

p

key

(

key

Start?

p

key

SERVO Mode



0 0 0

–

key

+,

AUDIO Mode



1 0 0

+,

–

key

POWER Mode



3 0 0

SERVO Mode

• Enter the TEST mode, press VOL − key and ( key to select

the SERVO mode.

• When the second digit of mode number is not 0 and the first
digit is 0 (010, 020, 030, etc.), the optical pickup moves to out­side track or inside track with + key or = key respec­tively.

• To select other modes, refer to the TEST mode configuration.

1. Configuration of SERVO Mode

key

–

+,

300 V3.000

Remote controller LCD

ROM version
display

• ROM version display → All ON → All OFF are repeated.

• To hold the display for confirmation, press the PLAY MODE
key.

SERVO Mode

0 0 0

p

key

p

key

p

key

(

key

OFFSET Adj.

0 1 0

LASER

POWER Adj.

0 2 0

+,–key +,–key

MO Adj.

0 3 0

(

key

Each time (key is press­ed,

011-013

are switched. (For each

p

key

mode, see relevant table)

(

key

Each time
ed,

p

key

p

key

021-024

are switched. (For each
mode, see relevant table)

(

key

Each time
ed,

031-039

are switched. (For each
mode, see relevant table)

modes

(

key

(

key is press-

modes

(

key

(

key is press-

modes

(

key

– 9 –

123

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