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Ver 1.0 1999.09
MICROFILM
MZ-E75
SERVICE MANUAL
PORTABLE MINIDISC PLAYER
SPECIFICATIONS
E Model
Tourist Model
Model Name Using Similar Mechanism
NEW
MD Mechanism Type
MT-MZE75-167
Optical Pick-up Mechanism Type
ODX-1B
US and foreign patents licensed from Dolby
Laboratories Licensing Corporation
System
Audio playing system
Minidisc digital audio system
Laser diode properties
Material : GaAlAs
Wavelength :
=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
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
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
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 (Tourist model) (1)
Design and specifications are subject to change without notice.


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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
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK
! OR DOTTED LINEWITH
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 dam-
aged by heat.
TABLE OF CONTENTS
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 Mini Disc player is classi-
fied as a CLASS 1 LASER
product.
The CLASS 1 LASER
PRODUCT label is located on the
bottom exterior.
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
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
Open/Close detection switch (S801)
* Replacement of CXD2661GA-2 (IC601) used
in this set requires a special tool. Therefore, it
cannot be replaced.


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SECTION 2
GENERAL
LOCATION AND FUNCTION OF CONTROLS
Main Unit
Headphones with Remote Control
1 i 1 jack
2 OPEN button
3 OPERATE indicator
4 > B button
5 . button
6 x button
7 i 2 jack
1 Headphones
2 x button
3
B >/. button
4 VOL +/­ button
5 DISPLAY button
8 VOLUME + button
9 VOLUME ­ button
q; External battery terminal (+/­)
qa DIGITAL SOUND PRESET switch
qs AVLS switch
qd HOLD switch
2
7
3
1
6
4
q;
qa`
qs
qd
9
5
8
4
5
6
9
8
3
2
1
7
6 PLAYMODE button
7 DISPLAY window
8 X button
9 HOLD
. switch


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SECTION 3
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
3-1. UPPER PANEL ASSY, "PANEL ASSY, BOTTOM"
3-2. BELT, ORNAMENTAL
r
The equipment can be removed using the following procedure.
Optical pick-up block ASSY
set
Upper panel ASSY, "Panel ASSY, bottom"
Belt, Ornamental
Main board
1
Screws (1.4)
3
Screw (1.7)
Upper panel ASSY
6
Screws (1.4)
5
7
Claw
4
Claw
2
Press the OPEN button
Main unit
Panel ASSY, bottom
Main unit
Belt, ornamental
2
1
Move it away
from projection


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3-3. MAIN BOARD
3-4. OPTICAL PICK-UP BLOCK ASSY
1
Screws (M1.4 toothed lock)
2
Screw (HP), step
Main board
Main unit
5
OP flexble board
3
CLV fexble board
4
3
Screw (M1.4) precision pan
Shaft (Main)
Chissis ASSY
OP flexible board
Optical pick-up block ASSY
OP flexible board
Double sided
adhesive tape
2
1
5
6
4
Note :
PuttheOPflexibleboardtoacorrect
positionofc hassisASSY .