Sony MD Walkman MZ-EP11 User manual

Ver 1.22004.03
9-923-222-14
2004C02-1
© 2004.03
Sony Corporation
Personal Audio Company
Publishedby Sony Engineering Corporation

– 2 –
TABLE OF CONTENTS
Specifications ........................................................................... 1
1. SERVICING NOTE.......................................................... 3
2. GENERAL
Location and Function of Controls .................................... 6
3. DISASSEMBLY ............................................................... 8
4. TEST MODE ...................................................................11
5. ELECTRICAL ADJUSTMENTS ................................. 14
6. DIAGRAMS
6-1. IC Pin Description .................................................... 16
6-2. Block Diagram.......................................................... 18
6-3. Printed Wiring Board................................................ 21
6-4. Schematic Diagram................................................... 25
7. EXPLODEDVIEWS
7-1. Panel Section ............................................................ 32
7-2. Mechanism Deck Section (MT-MZEP10-129) ........ 33
8. ELECTRICAL PARTS LIST ........................................ 34
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 OFANY 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.
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.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK !OR DOTTED LINEWITH
MARK !ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS
LIST ARE CRITICALTO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN
SUPPLEMENTS PUBLISHED BY SONY.
This Mini Disc player is classi-
fied as a CLASS 1 LASER prod-
uct.
The CLASS 1 LASER
PRODUCT label is located on
the bottom exterior.
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.
Ver 1.1 1998.05

– 3 –
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) with tape.
Chassis ass
y
Open/Close switch (S801)
Main board
Tape

– 4 –
OPERATIONS OF MECHANISM (MZ-EP11)
When loading a disc
The disc shutter 1opens when a disc is loaded. (Fig. 1)
≥
When a disc is loaded, the open lever 2moves in arrow direction
a, and the holder assembly 3lock is released. (Fig. 1 to 3)
≥
The slider 4slides in arrow direction b, and the holder assembly
3moves down to the chassis assembly (below). (Fig. 4)
≥
The OPEN/CLOSE SW (S801) is turned ON by the connection
lever linked. (Fig. 1)
≥
The wakeup mode is set and the power circuit starts operating.
(Fig. 1)
(Fig. 4)
(Fig. 3)
OPEN/CLOSE SW (S801) Open lever
2
Disc shutter 1
Insert the Mini Disc
Lock
Open lever 2
Insert the Mini Disc
Slider 4
b
Open lever 2
Relesse
Slider 4
Slider 4
Holder assembly 3
Descends to chassis side (below)
b
ON
(Fig. 2)

– 5 –
When removing the disc
When the open knob 1is slid in arrow direction a, and the open
slider 2lock is released, the disc shutter 3opens. (Fig. 5)
≥
The slider 4slides in arrow direction b, and the holder assembly
5moves up to the upper panel (above). (Fig. 6, Fig. 8)
≥
The OPEN/CLOSE SW (S801) is turned OFF by the connection
lever linked. (Fig. 5)
≥
The optical pick-up block 6moves to the inner circumference c.
(Fig. 5) ≥
The disc 7is pushed by the open lever 8, and ejected out from
the holder assembly 5. (Fig. 7)
≥
The sleep mode is set and the power supply stops.
(Fig. 5)
Slider 4
Slider 4
Slider 4
Holder assembly 5
Moves up to the upper panel (above)
b
b
Open lever 8
Open lever 8
Lock
Relesse
Open lever 8
OPEN/CLOSE SW (S801)
Disc shutter 3
(Fig. 6)
(Fig. 7)
(Fig. 8)
Disc is ejscted 7
Open Slider 2
(Release)
Open knob 1
a
Optical pick-up block 6
Disc is ejscted 7
OFF

– 6 –
SECTION 2
GENERAL
LOCATION AND FUNCTION OF CONTROLS
1AVLS switch
2HOLD switch
3DIGITAL MEGA BASS switch
4Battery compartment
52/ REMOTE jack
6MD operate buttons
((play) button
=, +button
pbutton
7EJECT knob
8VOLUME +, – buttons
9DC IN 1.5V jack
rMain Unit

– 7 –
1Headphones
2P(pause) button
3(/+, =buttons
4HOLD switch
5p(stop) button
6VOL +, – buttons
7DISPLAY button
8PLAYMODE button
1Character display
2Disc revolve indicator
3Battery condition indicator
4Track number display
rHeadphones with Remote Control
rDisplay windows (Remote Control)
1
1
23
2
4
4
5
5
8
8
7
7
6
6
Except US model
US model
Tourist model
ExceptTourist model
3
123
4
Tourist model Except Tourist model
1Headphones
2P(pause) button
3(/+, =control
4HOLD switch
5p(stop) button
6VOL +, – buttons
7DISPLAY button
8PLAYMODE button
Ver 1.1 1998.05

– 8 –
SECTION 3
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
Set
Mechanism deck
Panel (X) upper, Bottom panel Plate (Control) assy, ornamental Main board
Optical pick-up
rThe equipment can be removed using the following procedure.
3-1. PANEL (X) UPPER, BOTTOM PANEL REMOVAL
3-2. PLATE (CONTROL) ASSY, ORNAMENTAL REMOVAL
7
4
6
1
2 Screws
(M1.4 precision pan)
3 Screws
(M1.4 precision pan)
5 Screws
(M1.4 precision pan
)
5 Screws
(M1.4 precision pan)
Panel (X) upper
Lid, battery case
Stripe (A) assy,
Ornamental
*Caution during assembly
Align the MEGA BASS knob,
AVLS knob and the HOLD knob
position with the switch
on the Main board.
Bottom panel
6
3
Shutter
4 Screw (step)
4 Screw (step)
1 Spring (Shutter),
Tension
Plate (Control) assy,
ornamental
2 Screw
(M1.4 precision pan)
5 Screws
(M1.4 precision pan)
2 Screw
(M1.4 precision pan
)

– 9 –
3-3. MAIN BOARD REMOVAL
3-4. MECHANISM DECK REMOVAL
6
2 Screws
(M1.4 toothed lock)
2 Screws
(M1.4 toothed lock)
1 Screw (1.7 tapping)
3 Remove solder
7 CLV flexible board
(Main board CN551)
5 OP flexible board
(Main board CN501)
4 Switch unit
(Main board CN802)
3 Remove solde
r
Battery flexible
board
Main board
2
5
Case, battery
4 Damper
4 Dampers
3 Screws
(M1.4 precision pan)
1 Screws
(M1.4 precision pan
)
Mechanism deck
Chassis assy
Chassis (B) assy

– 10 –
3-5. OPTICAL PICK-UP REMOVAL
3-6. HOLDER ASSY REMOVAL
1 Screw ( precision)
Optical Pick-up
2
1 Washer (0.8–2.5
)
2 Spring (holder)
Holder assy
Chassis assy
3