Sony MZ-R90-R91, MT-MZR70-165 User Manual
MZ-R70
SERVICE MANUAL
Ver 1.3 2001. 01
With SUPPLEMENT-1
(9-927-631-81)
(Photo: Silver)
US and foreign patents licensed from Dolby
Laboratories Licensing Corporation.
SPECIFICATIONS
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 lens surface
on the optical pick-up block with 7 mm
aperture.)
Recording and playback time
Maximum 80 minutes (MDW-80, stereo
recording)
Maximum 160 minutes (MDW-80,
monaural recording)
Maximum 74 minutes (MDW-74, stereo
recording)
Maximum 148 minutes (MDW-74,
monaural recording)
Revolutions
400 rpm to 1,800 rpm (CLV)
Error correction
Advanced Cross Interleave Reed Solomon
Code (ACIRC)
Sampling frequency
44.1 kHz
Sampling rate converter
Input: 32 kHz/44.1 kHz/48 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
Inputs
Microphone: stereo mini-jack, 0.35–1.38
mV
Line in: stereo mini-jack, 69–194 mV
Optical (Digital) in: optical (digital) minijack
Outputs
i1: stereo mini-jack, maximum output
level 5 mW + 5 mW, load impedance 16
ohm
i2: stereo mini-jack, maximum output
level 5 mW + 5 mW, load impedance 16
ohm
General
Power requirements
Sony AC Power Adaptor (supplied)
connected at the DC IN 3 V jack:
120 V AC, 60 Hz (US model)
230-240 V AC, 50/60 Hz (UK and Hong
Kong model)
240 V AC, 50/60 Hz (Australia and New
Zealand model)
220-230 V AC, 50/60 Hz (European
model)
220 V AC, 50 Hz (China model)
220 V AC, 50 Hz (Argentina model)
100-240 V AC, 50/60 Hz (Other models)
PORTABLE MINIDISC RECORDER
US Model
Canadian Model
AEP Model
UK Model
E Model
Australian Model
Chinese Model
Tourist Model
Model Name Using Similar Mechanism MZ-R90/R91
Mechanism Type MT-MZR70-165
Optical Pick-up Name LCX-2R
Nickel cadmium rechargeable battery
NC-WMAA (supplied)
LR6 (size AA) alkaline battery (not
supplied)
Battery operation time
Battery life
Batteries Recording2)Playback
NC-WMAA Approx. Approx.
nickel cadmium 3 hours 6.5 hours
rechargeable
battery
LR6 (size AA) Approx. Approx.
Sony alkaline 3 hours
dry battery
1)
2)
3)
1)
3)
17 hours
The battery life may be shorter due to
operating conditions and the temperature
of the location.
When you record, use a fully charged
rechargeable battery.
Recording time may differ according to
the alkaline batteries.
– Continued on next page –
– 1 –
Dimensions
Approx. 81 × 74 × 26.2 mm (w/h/d)
(3 1/4 × 3 × 1 1/16 in.) without projections.
Mass
Approx. 115 g (4 oz) the recorder only
Approx. 155 g (5.4 oz) incl. a recordable
MD, and NC-WMAA nickel cadmium
rechargeable battery
Supplied accessories
AC power adaptor (1)
Headphones with a remote control (1)
Optical cable (1)
NC-WMAA nickel cadmium rechargeable
battery (1)
Rechargeable battery carrying case (1)
Carrying pouch (1)
Design and specifications are subject to change
without notice.
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.
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 label is located on
the bottom exterior.
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.
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 P ARTS 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 0 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 D ANS CE MANUEL
OU DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
– 2 –
TABLE OF CONTENTS
1. SERVICING NOTE ......................................................... 4
2. GENERAL......................................................................... 5
Looking at the Controls ........................................................5
Recording an MD Right Away! ............................................ 6
Playing an MD Right Away! ................................................. 7
3. DISASSEMBLY ............................................................... 8
3-1. Block Assy, Bottom ..............................................................8
3-2. Panel Block Assy, Upper....................................................... 8
3-3. LCD Module ......................................................................... 9
3-4. Main Board ........................................................................... 9
3-5. MD Mechanism Deck ......................................................... 10
3-6. Service Assy, OP ................................................................. 10
3-7. Holder Assy.........................................................................11
3-8. Motor Flexible Board .......................................................... 11
3-9. Motor, DC (M602) .............................................................. 12
3-10. “Motor, DC (M601)”, “Motor, DC (M603)” .................... 12
4. TEST MODE...................................................................13
4-1. Outline................................................................................. 13
4-2. Test Mode............................................................................13
4-3. Manual Mode ...................................................................... 14
4-4. Overall Adjustment Mode................................................... 15
4-5. Sound Skip Check Result Display Mode ............................ 16
4-6. Self-diagnosis Display Mode .............................................. 17
4-7. Key Check Mode.................................................................19
5. ELECTRICAL ADJUSTMENTS.............................. 20
5-1. Outline................................................................................. 20
5-2. Precautions for Adjustment................................................. 20
5-3. Adjustment Sequence .......................................................... 20
5-4. NV Reset ............................................................................. 20
5-5. Power Supply Manual Adjustment...................................... 20
5-6. Temperature Correction.......................................................22
5-7. Overall Adjustment Mode................................................... 22
5-8. Laser Power Check ............................................................. 23
6. DIAGRAMS..................................................................... 25
6-1. Block Diagram – MD Section –.......................................... 25
6-2. Block Diagram – Audio Section – ...................................... 27
6-3. Block Diagram – Power Supply Section –.......................... 29
6-4. Printed Wiring Board – Main Board – ................................ 31
6-5. Schematic Diagram – Main Board (1/3) – .......................... 35
6-6. Schematic Diagram – Main Board (2/3) – .......................... 37
6-7. Schematic Diagram – Main Board (3/3) – .......................... 39
6-8. IC Block Diagrams..............................................................41
6-9. IC Pin Descriptions ............................................................. 44
7. EXPLODED VIEWS..................................................... 51
7-1. Cabinet Section ................................................................... 51
7-2. Mechanism Deck Section ................................................... 52
8. ELECTRICAL PARTS LIST...................................... 53
– 3 –
SECTION 1
SERVICING NOTE
• When repairing this device with the power on, if you remove
the MAIN board or open the upper panel assy , this device stops
working.
In this case, you can work without the device stopping by fastening the hook of the open/close detect switch (S801) with tape.
Tape
MAIN board
S801
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 avove when
checking it for adustment. It is feared that you will lose your sight.
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
(LCX-2R)
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.
• 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.
(Refer to page 20.)
• Replacement of CXD2660R (IC502) and CXR701081 (IC801)
used in this set requires a special tool. Therefore, they cannot be
replaced.
laser-tap
OPTICAL PICK-UP FLEXIBLE BOARD
– 4 –
SECTION 2
GENERAL
This section is extracted from
instruction manual.
– 5 –
– 6 –
– 7 –
SECTION 3
DISASSEMBLY
Note : This set can be disassemble according to the following sequence.
Set Block Assy, Bottom Panel Block Assy, Upper LCD Module
Main Board MD Mechanism Deck
Note : Follow the disassembly procedure in the numerical order given.
3-1. BLOCK ASSY, BOTTOM
Note : When installing, fit the knobs (HOLD, SYNCHRO REC) and switches (S804, S807)
S804
S807
knob (HOLD)
knob (SYNCHRO REC)
3 screws (1.4)
Service Assy, OP
Motor Flexible Board
Motor, DC (M602)
“Motor, DC (M601)”, “Motor, DC (M603)”
Holder Assy
2
4 screws (1.4)
1 lid, battery case
3-2. PANEL BLOCK ASSY, UPPER
4 screws (1.4)
5
6 block assy, bottom
hinge
lid, battery case
block assy, bottom
Note:When installing the bottom block assy,
install the assy with the battery case lid open.
After it is installed, close the battery case lid.
6 panel block assy, upper
1 CN801
3
5 screws (1.4)
2
– 8 –
3-3. LCD MODULE
1 screws (1.7)
3 LCD module
claws
2
d
3-4. MAIN BOARD
6 screws (1.7)
7 stay
9 claws
0 claws
2 CN602
4 screw (1.4)
qs
8 screw (1.7)
1 CN601
5 screw (1.4)
qf MAIN boar
3 Remove the solder.
qa boss
– 9 –
qd CN501
3-5. MD MECHANISM DECK
3 boss
4 boss
chassis assy
5 MD mechanism deck
(MT-MZR70-165)
1 screw (1.4)
2 screw (1.4)
e
(MT-MZR70-165)
3-6. SERVICE ASSY, OP
3 precision pan screw
(M1.4)
4 rack spring
5 screw
9 bearing
1 washer (0.8 - 2.5)
2 gear (SA)
6 screw
8 Pull off the lead screw.
B
7
0 Opening the over write head
toward the direction A, remove th
OP Service assy toward
the direction B.
Note: Do not open the entire assy
forcibly, when opening
the over write head.
over write head section
– 10 –
A
3-7. HOLDER ASSY
5 Remove the holder assy to
direction of the arrow C.
1 Open the holder assy.
A
B
2 Push the convex portion
toward the direction B and
open the holder assy toward
the direction A to erect uprightly.
3
C
3-8. MOTOR FLEXIBLE BOARD
1 Remove four solders of
4 adhesive sheet
Note: Align a circular hole in the stripping paper
with a circular hole in the DC motor (sled),
when mounting the motor
flexible board.
4 boss
DC motor (sled) (M602).
2 Remove two solders of
DC motor (over write head up/down) (M603).
3 Remove four solders of
DC motor (spindle) (M601).
5 motor flexible board
DC motor (sled)
circular hole
– 11 –
3-9. MOTOR, DC (M602)
1 Remove four solders of
motor flexible board.
4 two precision pan screws
(M1.4)
5 DC motor (sled) (M602)
2 washer (0.8 - 2.5)
3 gear (SA)
3-10. “MOTOR, DC (M601)”, “MOTOR, DC (M603)”
1 Remove six solders of
motor flexible board.
4 three precision pan screws
(M1.4)
qs DC motor (over write head up/down)
(M603)
6 two precision pan screws
(M1.4)
qa gear chassis assy
0 screw
(M1.2 × 1.5)
8 gear (HB)
Note: Press-fit the gear (HA) up to the
position of the DC motor (over write
head up/down) (M603) as shown
below.
gear (HA)
2.65 mm
gear chassis assy
DC motor
(over write head up/down)
(M603)
9 gear (HA)
7 washer (0.8 - 2.5)
2 washer (0.8 - 2.5)
3 gear (HC)
5 DC motor
(spindle)
(M601)
– 12 –
1
R506
3
SECTION 4
TEST MODE
4-1. OUTLINE
• This set provides the Overall adjustment mode (Assy mode) that
allows CD and MO disc to be automatically adjusted when in
the test mode. In this overall adjustment mode, the protect switch
is detected to judge the disc, CD or 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.
• The keys in the description refer to the keys on both set and
remote commander unless otherwise specified. Though LCD
display shows the LCD of the remote commander, same contents are also displayed on the LCD of the set.
4-2. TEST MODE
4-2-1. Setting Method of Test Mode
There are two different methods to set the test mode:
1 Short BP801 (TEST) on the MAIN board with a solder bridge
(connect pin y; of IC801 to the ground). Then, turn on the
power.
– MAIN BOARD (SIDE B) –
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
control keys in the following order:
> t > t . t . t > t . t
> t . t X t X
4-2-2. Operation in Setting the Test Mode
• When the test mode becomes active, first the display check mode
is selected. (Press
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 dis-
play.
LCD display
All lit
All off
Microprocessor
version
display
888
xxxxxxxxx
001
V0.000
F1SHUF
REC
25
26
28
32
36
47
144 146
37 46 47 50 53 56 59 64 68
42 45 48 51 55 57 60 63 66 67
38 40
43 44 49 52 54 58 61 62 65 697071
39 41
FB503FB502
IC502
FB501
R503
9
AP507
AP506
2
88 87 86 83 81 78 74 72 69 64 63 60 58
0
90 89 85 84 80 77 75 71 68 65 62 59 57
05
93 92 91
82 79 76 73 70 67 66 61 55 56
96 95 94
99 98 97
AP803
101102 100
104105 103
104108 106
AP804
110109 111
114113 112
115
116
117
268
118
119
120
1359
2
R508
IC801
74
R509
10 13 16
11 14 17
12 15 18
FB504
R510
AP1001
19 22 27
21 23
20 24
BP801
L502
C529
52 53 54
49 50 51
46 47 48
43 45 44
40 41 42
37 36 39
34 35 36
26 28 31
25 29 30
• When the
X key is pressed and hold down, the display at that
time is held so that display can be checked.
4-2-3. 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 MAIN board.
Note:Remove the solders completely. Remaining could be shorted with
the chassis, etc.
88
89
90
AP521
85
86
87
82
83
84
78
80
81
76
77
79
73
74
75
145
72
C537
R530
R529
OFF ON
AP508
AP504
AP505
S804
HOLD
C530
BP801
AP511
AP516
AP519
AP830
X801
AP517
C801
AP834
AP807
AP907
AP911
AP806
54
32 33
R935
8
AP5209
IC802
1
For test mode set with the method 2:
Turn off the power.
Note: If electrical adjustment (see page 20) has not been finished com-
pletely, always start in the test mode. (The set cannot start in normal mode.)
– 13 –
4-2-4. Configuration of Test Mode
[Test Mode $Display Check Mode%]
1)
Press the > *
Press the x *
Press the . *
Press the x *
Press the N *
Press the x *
or
[VOL +] *
3)
3)
1)
3)
[Manual Mode]
key
3)
or [VOL --] *3) key
[Overall Adjustment Mode]
key
or [REC] *1) or N > *2) key
key
[Sound Skip Check Result Display Mode]
press the [DISPLAY] *
Press the x *
Press the
on the remote commander for several seconds.
3)
[T MARK] *
2)
or MENU . *1) key
[Self-Diagnosis Display Mode]
key
3)
or [DISPLAY] *2) key
[Key Check Mode]
Quit the key check or open the upper panel
Note: *1) on the set
*2) on the remote commander
*3) on the set or remote commander
3)
key
[Servo Mode]
[Audio Mode]
[Power Mode]
[OP Alignment Mode]
[Major item switching]
N key x key
[Medium item switching]
N key
x key
[Minor item switching]
[VOL +] key:100th place of mode number
increase.
[VOL --] key:100th place of mode number
decrease.
[VOL +]
key:10th place of mode number
increase.
[VOL --] key:10th place of mode number
decrease.
N key: Unit place of mode number
increase.
[Adjusted value variation]
[VOL +] key:Increases the
adjusted value
[VOL --] 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.
4-3. MANUAL MODE
Mode to adjust or check the operation of the set by function.
Normally, the adjustment in this mode is not executed.
• Transition method in Manual Mode
1. Setting the test mode. (See page 13)
2. Press the
where the LCD display as shown below.
3. The optical pick-up moves outward or inward while
the
tively.
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.
> or [VOL +] key activates the manual mode
LCD display
000
Manual
> or . key is pressed for several seconds respec-
– 14 –
5. The display changes a shown below each time the jog key on
> key . key
> key
Title
display
CD overall
adjusting
CD overall
adjustment
OK
MO overall
adjusting
MO overall
adjustment
OK
CD overall
adjustment
NG
MO overall
adjustment
NG
N key
protect switch ON
All item
OK
protect switch OFF
NG item exists
or
x key
NG item exists
or
x key
x key
x key
x key
x key
[Test mode $display check mode%]
the set is turned up or
mander is pressed.
• Address & Adjusted Value Display
LCD display
011
C68S01
address
mode number
• Jitter Value & Adjusted Value Display
LCD display
011
0FFJ01
jitter value
mode number
• Block Error Value & Adjusted Value Display
LCD display
011
063B01
block error value
mode number
[DISPLAY] key on the remote com-
adjusted value
adjusted value
adjusted value
4-4. OVERALL ADJUSTMENT MODE
Mode to adjust the servo automatically in all items.
Normally, automatic adjustment is executed in this mode at the
repair.
Adjust the CD first, when performing adjustment.
• Configuration of overall adjustment
• ADIP Error Value & Adjusted Value Display
LCD display
011
mode number
6. Quit the manual mode, and press
• Item Title Display
LCD display
011
mode number
However in the power mode (mode number 700’s), only the
power adjustment value is displayed.
• Power Supply Adjusted Value
LCD display
731
mode number
mode (display check mode).
059A01
ADIP error value
adjusted value
LrefPw 01
item title
AD 85
fixed display
adjusted value
adjusted value
x key to return to the test
For further information, refer to the Section 5 Electrical Adjustment. (See page 20)
– 15 –
4-5. SOUND SKIP CHECK RESUL T DISPLAY MODE
This set can display and check the error count occurring during
record and play.
• Setting method of Sound Skip Check Result Display
Mode
1. Setting the test mode. (See page 13)
2. Press the
check result display mode where the LCD displays as shown
below.
When
3. When N key or N> key on the remote commander is
pressed, the total of error count is displayed on the LCD, and
each time the
one by one as shown below. Also, when
the error count ascends by one. If
pressed, the error count during record is displayed.
N or [REC] key on the set activates the sound skip
N or [REC] key on the set is pressed:
LCD display
000
P**R**
Total of record system
error count
Total of play system error count
> key is pressed, the error count descents
. key is pressed,
[REC] key on the set is
000
P**R**
000
EIB **
000
Stat**
000
Adrs**
000
BEmp**
4. When [REC] key on the set is pressed, the total of error count
is displayed on the LCD, and each time the
> key is pressed,
the error count descents one by one as shown below. Also,
. key is pressed, the error count ascends by one.
when
If
N key is pressed, the error count during play is displayed.
000
P**R**
000
BOvr**
000
Bful**
000
Rtry**
000
######
**
: Sound skip check items counter (hexadecimal)
######
: 6-digit address (hexadecimal) where a sound skipped
last
Error code
Cause of error Description of error
EIB Sound error correction error
Playback
Recording Bful Buffer capacity lowers and data are
Stat Decorder status error
Adrs Cannot access the address
BEmp Buffer becomes empty
BOvr Buffer becomes full and sounds are
dumped
forcibly written
Rtry Retry count over
5. Quit the sound skip check result display mode, and press
the
x key to return to the test mode (display check mode).
000
######
**
: Sound skip check items counter (hexadecimal)
######
: 6-digit address (hexadecimal) where a sound skipped
last
– 16 –
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