Sony MZE-77 Service manual
MZ-E77
SERVICE MANUAL
Ver 1.0 2000. 03
Photo: Silver type
US and foreign patents licensed from Dolby
Laboratories Licensing Corporation.
SPECIFICATIONS
E Model
Tourist Model
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: λ = 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
Playback
Approx. 21 hours**
Approx. 31 hours
Approx. 56 hours**
Dimensions
Approx. 78.3 × 13.9 × 71.4 mm (w/h/d)
1
(3
/8 × 9/16 × 2
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)
Design and specifications are subject to change
without notice.
7
/8 in.) not including projecting
PORTABLE MINIDISC PLAYER
TABLE OF CONTENTS
p
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
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 o
tical read errors.
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 DIA GRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANU AL OR IN SUPPLEMENTS PUBLISHED BY SONY.
– 2 –
SECTION 1
SW board (S809)
SERVICING NOTES
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic 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 electrostatic break-down easily. When handling it, perform soldering
bridge to the laser-tap on the flexible board. Also perform measures against electrostatic break-down sufficiently before the operation. The flexible board is easily damaged and should be handled
with care.
• 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 perform automatic adjustment and write resultant values to the new
EEPROM.
After EEPROM (IC802) is replaced, digital sound preset setting 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)
laser-tap
OPTICAL PICK-UP FLEXIBLE BOARD
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 damaged by heat.
• Replacement of CXD2661GA-2 (IC601) and CXR701080010GA (IC801) used in this set requires a special tool. Therefore, they cannot be replaced.
– 3 –
LOCATION OF CONTROLS
8
7
SECTION 2
GENERAL
9
6
5
4
1 OPR indicator
2 HOLD switch
3 >/B and . keys
4 x key
5 DIGITAL SOUND PRESET switch
6 AVLS switch
Remote commander with headphones
3
2
5
1
6
qa
7 Battery cover
8 VOLUME +/– keys
9 External battery terminal
0 OPEN button
qa i (headphone) jack
7
8
0
4
3
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
– 4 –
9
21
SECTION 3
3 two screws
(MI1.4)
3 two screws
(MI1.4)
4 lid assy, upper
2
1
y
DISASSEMBLY
Note: This set can be disassemble according to the following sequence.
Set
LID ASSY, UPPER
Lid Assy, Upper
strip,
ornamental
Holder Assy
“Chassis Assy, set”, “Case, Battery”,
MAIN board, SW board
Mechanism Deck
(MT-MZE90-166)
Service Assy, OP
(LCX-2E)
Panel Assy Bottom
HOLDER ASSY
3 holder ass
2 shaft
1 shaft
– 5 –
MECHANISM DECK
(MT-MZE90-166)
2 screw (MD)
1 seal (moire)
3 claw
8 flexible board (CN551)
PANEL ASSY, BOTTOM
Note: When installing, fit three knobs.
4
6
9 mechanism deck
(MT-MZE90-166)
5 claw
5 claw
7 flexible board (CN501)
knob
1
2 screw
(M1.4)
2 two screws
(MI1.4)
2 two screws
(MI1.4)
3 panel assy, bottom
– 6 –
STRIP, ORNAMENTAL
7
strip, ornamental
2 lid, battery case
1 claw
6
5 claw
4 claw
3 claw
9 button (open)
“CHASSIS ASSY, SET”, “CASE, BATTERY”,
MAIN BOARD, SW BOARD
6 case, battery
5 SW board
flexible board
3 Remove the solder
of terminal board (minus).
8 terminal
board (minus)
8 strip, ornamental
9 chassis assy, set
3 Remove the solder
of terminal (plus) assy,
battery.
8 terminal (plus)
assy, battery
7 screw
(MI1.4)
4 MAIN board
2 flexible board
(CN802)
1 four screws
(M1.4)
– 7 –
SERVICE ASSY, OP
(LCX-2E)
5 service assy, OP
(LCX-2E)
4 screw
(M1.4)
3 screw
(M1.4)
1 washer
2 gear (SA)
– 8 –
SECTION 4
TEST MODE
Outline
• This set provides the Overall adjustment mode that allows CD
and MO discs to be automatically adjusted when in the test mode.
In this overall adjustment mode, the disc is discriminate between
CD and MO, and each adjustment is automatically executed in
order. If a fault is found , the system displays its location. Also,
the manual mode allows each individual adjustment to be automatically adjusted.
• 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 Method of Test Mode
There are two different methods to set the test mode:
1 Short BP801 (TEST) on the SYSTEM board with a solder
bridge (connect pin y; of IC801 to the ground). Then, turn on
the power.
– SYSTEM BOARD (Component Side) –
BP801
(TEST)
Operation in Setting the Test Mode
• When the test mode becomes active, first the display check mode
is selected. (Press the x key once, when the display check mode
is not active)
• Other mode can be selected from the display check mode.
• When the test mode is set, the LCD repeats the following display.
LCD display
All lit
All off
Microprocessor
version
display
• When the X key is pressed and hold down, the display at that
time is held so that display can be checked.
888
004 V1.600
F1SHUF
REC
u
Releasing the Test Mode
For test mode set with the method 1:
Turn off the power and open the solder bridge on BP801 (TEST)
on the SYSTEM board.
Note: Remove the solders completely. Remaining could be shorted with
the chassis, etc.
For test mode set with the method 2:
Turn off the power.
Note: If electrical adjustment (see page 14) has not been finished com-
pletely, always start in the test mode. (The set cannot start in normal mode)
2 In the normal mode, turn on the HOLD switch on the set. While
pressing the x key on the set, press the following remote
commander keys in the following order:
N > t N > t . t . t N > t
. t N > t . t X t X
– 9 –
Configuration of Test Mode
[Test Mode $Display Check Mode%]
Press the [VOL +] key
[Manual Mode]
Press the x key
[Servo Mode]
[Audio Mode]
[Power Mode]
[OP Alignment Mode]
Press the . or [VOL --] key
[Overall Adjustment Mode]
Press the x key
press the [DISPLAY] key
[Self-Diagnosis Display Mode]
Press the x key
Press the
for several seconds (about 3 seconds).
[DISPLAY] key
[Key Check Mode]
Quit the key check or open the upper panel
Manual Mode
Mode to adjust or check the operation of the set by function.
Normally, the adjustment in this mode is not executed.
However, the Manual mode is used to clear the memory before
performing automatic adjustments in the Overall Adjustment mode.
• Transition method in Manual Mode
1. Setting the test mode. (See page 9)
2. Press the [VOL +] key activates the manual mode where the
LCD display as shown below.
LCD display
[Major item switching]
N
key
x
>
key
[Medium item switching]
N
>
key
x
key
[Minor item switching]
[VOL +]
[VOL --]
key:100th place of mode number
increase.
key:100th place of mode number
decrease.
[VOL +]
[VOL --]
>
key:10th place of mode number
increase.
key:10th place of mode number
decrease.
N
key: Unit place of mode number
increase.
[Adjusted value variation]
[VOL +]
[VOL --]
key:Increases the
adjusted value
key:Decreases the
adjusted value
[Adjusted value write]
X
key: When adjusted value is
changed:
Adjusted value is written.
When adjusted value is
not changed:
That item is adjusted
automatically.
000 Manual
3. During each test, the optical pick-up moves outward or inward while the
seconds respectively.
4. Each test item is assigned with a 3-digit mode number;
100th place is a major item, 10th place is a medium item, and
unit place is a minor item.
N > or . key is pressed for several
– 10 –
5. The display changes a shown below each time the
key is pressed.
• Address & Adjusted Value Display
LCD display
011 C68S01
mode number
address
• Jitter Value & Adjusted Value Display
LCD display
adjusted value
011 OFFJ01
mode number
jitter value
• Block Error Value & Adjusted Value Display
LCD display
adjusted value
011 063B01
block error value
mode number
• ADIP Error Value & Adjusted Value Display
LCD display
adjusted value
[DISPLAY]
Self-Diagnosis Display Mode
• This set uses the self-diagnosis system in which if an error oc-
curs in playback mode, the error is detected by the model control and power control blocks of the microprocessor and information on the cause is stored as history in EEPROM.
By viewing this history in test mode, it helps you to analyze a
fault and determine its location.
1. Setting the test mode. (See page 9)
2. In the display check mode, press the [DISPLAY] key activates
the self-diagnosis display mode where the LCD display as shown
below.
LCD display
000 1st0**
history code
3. Then, each time the N > key is pressed, LCD display descends by one as shown below. Also, the LCD display ascends
by one when the . key is pressed.
1
000 1st0**
error display code
011 059A01
ADIP error value
mode number
• Item Title Display
LCD display
adjusted value
011 LrefPw 01
mode number
item title
However in the power mode (mode number 700’s), only the
item is displayed.
6. Quit the manual mode, and press the
test mode (display check mode).
Overall Adjustment Mode
Mode to adjust the servo automatically in all items.
Normally, automatic adjustment is executed in this mode at the
repair.
For further information, refer to “Section 5 Electrical Adjustments”.
(See page 14)
adjusted value
x key to return to the
000 1st100
000 1st200
000 N 0**
000 N 100
000 N 200
000 N-10**
4. Quit the self-diagnosis display mode, and press the x key to
return to the test mode (display check mode).
000 N-1100
000 N-1200
000 N-20**
000 N-2100
000 N-2200
000 R 0000
1
– 11 –
• Description of Indication History
History code number Description
1st 0 The first error
1st 1 Displays “00”
1st 2 Displays “00”
N 0 The last error
N 1 Displays “00”
N 2 Displays “00”
N-1 0 One error before the last.
N-1 1 Displays “00”
N-1 2 Displays “00”
N-2 0 Two errors before the last.
N-2 1 Displays “00”
N-2 2 Displays “00”
REC Total recording time (Displays “0000” in this set)
• Description of Error Indication Codes
Problem Indication code Meaning of code Description
No error 00 No error Normal condition
01
Servo error 02 High temperture High temperture
03 Focus error Forcus could not be applied
04 Spindle error Abnormal lotation of disc
21 Initial low battery Abnormal voltage at initialization
Power error
22 Low battery Momentary interruption detected
23 Low battery NI Momentary interruption detected (NiMH)
24 Low battery AM Momentary interruption detected (AM)
Illegal access target address Attempt to access an abnormal address
was specified
Reset the error display code
After servicing, reset the error display code.
1. Setting the test mode. (See page 9)
2. Press the [DISPLAY] key activates the self-diagnosis display mode.
3. To reset the error display code, press the X key (2 times) when the code is displayed (except “R0000”).
(All the data on the 1st, N, N-1, and N-2 will be reset)
– 12 –
Key Check Mode
This set can check if the set and remote commander function normally.
• Setting Method of Key Check Mode
1. Setting the test mode. (See page 9)
2. Press the [DISPLAY] key for several seconds (about 3 seconds) activates the key check mode. (At the last two digits,
AD value of remote commander key line is displayed in hexadecimal)
LCD display
000 **
∗∗: AD value of the remote commander key (hexadecimal 00
to FF)
3. When each key on the set and on remote commander is pressed,
its name is displayed on the LCD. (The operated position is
displayed for 4 seconds after the slide switch is operated. If
any other key is pressed during this display, the LCD switches
to its name display.)
Example1: When >/N key on the set is pressed:
LCD display
000 FF **
∗∗: AD value of the remote commander key (hexadecimal 00
to FF)
Example2: When N > key on the remote commander is
pressed:
LCD display
000 rPLAY **
∗∗: AD value of the remote commander key (hexadecimal 00
to FF)
4. When all the keys on the set and on the remote commander are
considered as OK, the following displays are shown for 4 seconds.
(The key pressed to enter the Key Check mode has been check ed
even if it is not pressed in this mode)
Example1: When the keys on the set are considered as OK:
LCD display
000 SET OK **
∗∗: AD value of the remote commander key (hexadecimal 00
to FF)
Example2: When the keys on the remote commander are con-
sidered as OK:
LCD display
000 RMC OK **
∗∗: AD value of the remote commander key (hexadecimal 00
to FF)
5. When all the key have been checked or when the top panel is
opened during this checking, the system terminates the Key
Check mode and return to the test mode (display check mode).
– 13 –
SECTION 5
ELECTRICAL ADJUSTMENTS
Outline
• In this set, automatic adjustment of CD and MO can be performed by entering the test mode. (See page 9)
However , before starting automatic adjustment, the memory clear
and power adjustment must be performed in the manual mode.
• A key having no particular description in the text, indicates a
remote commander key.
Precautions for Adjustment
1. Adjustment must be done in the test mode only.
After adjusting, release the test mode.
2. Use the following tools and measuring instruments.
• Test CD disc TDYS-1
(Part No. : 4-963-646-01)
• Recorded MO disc PTDM-1
(Part No. : J-2501-054-A)
Available SONY MO disc (recorded)
• Digital voltmeter
3. Unless specified otherwise, supply DC 1.2V from the DC IN
jack.
4. Switch position
AVLS switch ................................................ NORM
DIGITAL SOUND PRESET switch ........... OFF
HOLD switch ............................................... OFF
Adjustment Sequence
Adjustment must be done with the following steps.
1. NV Reset (Memory clear)
r
2. Digital Sound Preset Setting Manual Mode
r
3. Power Supply Manual Adjustment
r
4. CD Overall Adjustment
r Overall Mode
5. MO Overall Adjustment
NV Reset
• Setting method of NV reset
1. Select the manual mode of test mode, and set mode number 021NV Reset. (See page 10)
LCD display
021 ResNV
2. Press the X key.
LCD display
021 ResOK?
3. Press the X key once more.
LCD display
021 Res***
NV reset (after several seconds)
021 Reset!
4. Press the x key to quit the manual mode, and activate
the test mode.
Digital Sound Preset Setting
1. Select the manual mode of the test mode, and set the item
number 045. (See page 10)
LCD display
045 D.S.P **
∗∗: Adjustment value of digital sound preset set up.
2. Adjust [VOL +] key so that the adjustment value becomes
01.
LCD display
045 XXXS01
3. Press the X key to write the adjusted value.
Power Supply Manual Adjustment
• Adjustment sequence
Adjustment must be done with the following steps.
1. Vc PWM Duty (L) adjustment (item number: 762)
r
2. Vrem PWM Duty (L) adjsutment (item number: 764)
r
3. Vc PWM Duty (H) adjustment (item number: 765)
r
4. Vrem PWM Duty (H) adjustment (item number: 766)
– 14 –
• Adjustment method of Vc PWM Duty (L)
(item number: 762)
1. Select the manual mode of the test mode, and set the item num-
ber 762. (See page 10)
LCD display
• Adjustment method of Vrem PWM Duty (H)
(item number: 766)
1. Select the manual mode of the test mode, and set the item
number 766. (See page 10)
LCD display
762 Vc1PWM
2. Connect a digital voltmeter to the TP901 (VC) on the MAIN
board, and adjust
(voltage down) so that the voltage becomes 2.32 V.
[VOL +] key (voltage up) or [VOL --] key
+0.005
–0.01
Proceed to the next adjustment without pressing the X key if
voltage is already adjusted.
digital
voltmeter
MAIN board
TP901 (VC)
TP912 (GND)
3. Press the X key to write the adjusted value.
• Adjustment method of Vrem PWM Duty (L)
(item number: 764)
1. Select the manual mode of the test mode, and set the item number 764. (See page 10)
LCD display
764 Vr1Vc1
2. Connect a digital voltmeter to the TP903 (VR) on the MAIN
board, and adjust
(voltage down) so that the voltage becomes 2.25 V.
Proceed to the next adjustment without pressing the X key if
voltage is already adjusted.
3. Press the
• Adjustment method of Vc PWM Duty (H)
(item number: 765)
1. Select the manual mode of the test mode, and set the item number 765. (See page 10)
LCD display
[VOL +] key (voltage up) or [VOL --] key
digital
voltmeter
MAIN board
TP903 (VC)
TP912 (GND)
X key to write the adjusted value.
+0.005
–0.01
766 VrhVch
2. Connect a digital voltmeter to the TP903 (VR) on the MAIN
board, and adjust
(voltage down) so that the voltage becomes 2.6 ± 0.015 V.
Proceed to the next adjustment without pressing the X key if
voltage is already adjusted.
3. Press the X key to write the adjusted value.
Adjustment and Connection Location:
– MAIN Board (Component side) –
TP901 (VC)
+
C917
CN501
20
1
C557
L551
C902
L903
C918
R922
36 25
R921
37
R920
R918
+
C553
48
C915
C916
112
R943
C908
R940
C855
R551
R809
CN802
1
[VOL +] key (voltage up) or [VOL --] key
digital
voltmeter
MAIN board
TP903 (VC)
TP912 (GND)
A
+
IC901
R552 C552
85
IC552
C901
24
13
R936
R505
R517
C527
R516
C551
R630
C619
A
D902
D901
K
K
R941
R903
C905
R902
R909
L902
C906
R904
R905
R910
R942
+
C911
D903
AK
C903
L905
TP912 (GND)
R518
C507
C506
C530
22 1
23 44
C505
C504
C503
C502
R501
IC501
+
L904
Q901
R937R938
G
D
S
TP903 (VR)
R502
C501
R503
Q902
BCE
R944
L901
C904
+
C907
+
C529
C
Q501
B
E
R519
R521
C519
765 VchPWM
2. Connect a digital voltmeter to the TP901 (VC) on the MAIN
board, and adjust
(voltage down) so that the voltage becomes 2.75 ± 0.015 V.
Proceed to the next adjustment without pressing the X key if
voltage is already adjusted.
3. Press the
[VOL +] key (voltage up) or [VOL --] key
digital
voltmeter
MAIN board
TP901 (VC)
TP912 (GND)
X key to write the adjusted value.
– 15 –
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