SERVICE MANUAL
PORTABLE MINIDISC PLAYER
E Model
Tourist Model
SPECIFICATIONS
MZ-E77
US and foreign patents licensed from Dolby
Laboratories Licensing Corporation.
Photo: Silver type
Model Name Using Similar Mechanism
MZ-E90
MD Mechanism Type
MT-MZE90-166
Optical Pick-up Mechanism Type
LCX-2E
System
Audio playing system
MiniDisc digital audio system
Laser diode properties
Material: GaAlAs
Wavelength:
= 790 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 objective lens surface on
the optical pick-up block with 7 mm aperture.
Revolutions
600 rpm to 2250 rpm
Error correction
Advanced Cross Interleave Reed Solomon Code
(ACIRC)
Sampling frequency
44.1 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
Outputs
Headphones: stereo mini-jack, maximum output
level 5 mW + 5 mW, load impedance 16 ohms
General
Power requirements
Nickel metal hydride rechargeable battery
NH-14WM (supplied)
One LR6 (size AA) battery (not supplied)
Sony AC Power Adaptor AC-E15L* (not
supplied) connected to the DC IN 1.5V jack
Battery operation time
Battery life*
Batteries
Ni-MH
rechargeable battery
(NH-14WM)
One LR6 (size AA)
alkaline battery
One LR6 (size AA)
alkaline battery
and a Ni-MH
rechargeable
battery
(NH-14WM)
* The battery life may be shorter depending on
operating conditions and the temperature of
the location.
** With a fully charged battery
Dimensions
Approx. 78.3
× 13.9 × 71.4 mm (w/h/d)
(3 1/8
× 9/16 × 2 7/8 in.) not including projecting
parts and controls
Mass
Approx. 85 g (3.0 oz.) the player only
Approx. 128 g (4.5 oz.) incl. a premastered MD
and a nickel metal hydride rechargeable battery
NH-14WM
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)
Approx. 21 hours**
Approx. 31 hours
Approx. 56 hours**
Design and specifications are subject to change
without notice.
Playback
Ver 1.0 2000. 03
2
TABLE OF CONTENTS
1.
SERVICING NOTES ............................................... 3
2.
GENERAL ................................................................... 4
3.
DISASSEMBLY ......................................................... 5
4.
TEST MODE .............................................................. 9
5.
ELECTRICAL ADJUSTMENTS ......................... 14
6.
DIAGRAMS
6-1. Block Diagram RF Section ......................................... 19
6-2. Block Diagram SERVO Section ................................ 21
6-3. Block Diagram MAIN Section .................................. 23
6-4. Printed Wiring Board
MAIN Board (Component Side) ............................... 25
6-5. Printed Wiring Board
MAIN Board (Conductor Side) ................................. 27
6-6. Schematic Diagram MAIN Board (1/4) .................... 29
6-7. Schematic Diagram MAIN Board (2/4) .................... 31
6-8. Schematic Diagram MAIN Board (3/4) .................... 33
6-9. Schematic Diagram MAIN Board (4/4) .................... 35
6-10. Printed Wiring Board SYSTEM Board ..................... 37
6-11. Schematic Diagram SYSTEM Board ........................ 39
6-12. Printed Wiring Board SW Board ............................... 41
6-13. Schematic Diagram SW Board .................................. 43
6-14. IC Pin Function Description ........................................... 49
7.
EXPLODED VIEWS ................................................ 56
8.
ELECTRICAL PARTS LIST ............................... 58
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED
LINE WITH MARK 0 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 PUB-
LISHED BY SONY.
Features
· Small body almost the size of a MiniDisc
jacket
Ideal weight and size; fits in your shirt
pocket.
· Personalized sound through Digital
Sound Preset functions
You can store two sets of sound quality
adjustments (made during playback) to
two switches.
· Low power-consumption design enables
extended battery life.
· Simple "One-Touch Eject" function for
easy MiniDisc handling
A single press of the OPEN button causes
the player lid to open and the MiniDisc to
eject.
· Easy-to-operate headphones remote
control with backlit LCD
The LCD displays disc and track
information, playback mode as well as
battery condition. Keep the main unit in
your pocket and operate the MiniDisc
player through the "slim stick" remote
control.
· Shock-resistant memory offsets up to 40
seconds of optical read errors.
3
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electro-
static break-down because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
Never look into the laser diode emission from right above when
checking it for adjustment. It is feared that you will lose your sight.
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
(LCX-2E)
The laser diode in the optical pick-up block may suffer electro-
static break-down easily. When handling it, perform soldering
bridge to the laser-tap on the flexible board. Also perform mea-
sures against electrostatic break-down sufficiently before the op-
eration. The flexible board is easily damaged and should be handled
with care.
OPTICAL PICK-UP FLEXIBLE BOARD
SECTION 1
SERVICING NOTES
· When repairing this set with the power on, if you remove the
upper panel assy, this set stops working.
In this case, you can work without the set stopping by fastening
the hook of the open/close detect switch (SW board (S809))
with tape.
· This set is designed to perform automatic adjustment for each
adjustment and write its value to EEPROM. Therefore, when
EEPROM (IC802) has been replaced in service, be sure to per-
form automatic adjustment and write resultant values to the new
EEPROM.
After EEPROM (IC802) is replaced, digital sound preset set-
ting value for display is changed to "00". Please make sure to
check that digital sound preset setting value for display is "01".
(Refer to page 14)
· Replacement of CXD2661GA-2 (IC601) and CXR701080-
010GA (IC801) used in this set requires a special tool. There-
fore, they cannot be replaced.
SW board (S809)
laser-tap
Flexible Circuit Board Repairing
· Keep the temperature of the soldering iron around 270 °C dur-
ing 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.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.
4
SECTION 2
GENERAL
1
OPR indicator
2
HOLD switch
3
>/B and . keys
4
x key
5
DIGITAL SOUND PRESET switch
6
AVLS switch
7
Battery cover
8
VOLUME +/ keys
9
External battery terminal
0
OPEN button
qa
i
(headphone) jack
LOCATION OF CONTROLS
Remote commander with headphones
9
3
8
7
6
4
2
1
qa
0
5
1
Headphone
2
B > and . keys
3
VOL +/ keys
4
Display window
5
DISPLAY key
6
PLAYMODE key
7
X key
8
HOLD switch
9
x key
8
7
6
5
4
3
21
9
5
LID ASSY, UPPER
HOLDER ASSY
Note: This set can be disassemble according to the following sequence.
SECTION 3
DISASSEMBLY
Holder Assy
Mechanism Deck
(MT-MZE90-166)
Service Assy, OP
(LCX-2E)
Panel Assy Bottom
"Chassis Assy, set", "Case, Battery",
MAIN board, SW board
Lid Assy, Upper
Set
strip,
ornamental
3
two screws
(MI1.4)
3
two screws
(MI1.4)
4
lid assy, upper
2
1
3
holder assy
1
shaft
2
shaft