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SERVICE MANUAL
PORTABLE MINIDISC RECORDER
US Model
Canadian Model
Australian Model
Chinese Model
MZ-R90
AEP Model
UK Model
E Model
Tourist Model
MZ-R90/R91
SPECIFICATIONS
MZ-R90/R91
US and foreign patents licensed from Dolby
Laboratories Licensing Corporation.
Photo: MZ-R91 (Blue type)
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 lens surface on the optical
pick-upblock with7mmaperture.)
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
± 3dB
Wow and Flutter
Below measurable limit
Inputs
Microphone: stereo mini-jack, 0.35­1.38 mV
Line in: stereo mini-jack, 69­194 mV
Optical (Digital) in: optical (digital) mini-jack
Outputs
i
/LINE OUT*: stereo mini-jack
Headphones: maximum output level 5 mV +
5 mV, load impedance 16 ohm
LINE OUT: 194 mV, load impedance 10
kilohm
*The i/LINE OUT jack connects either
headphones or a line cable.
General
Power requirements
Sony AC Power Adaptor (supplied) connected
at the DC IN 3 V jack:
220­230 V AC, 50/60 Hz (European model)
120 V AC, 50 Hz (Canadian model)
100­240 V AC, 50/60 Hz (Other models)
Nickel metal hydride rechargeable battery NH-
14WM (supplied)
LR6 (size AA) alkaline battery (not supplied)
Battery operation time
Dimensions
MZ-R90
Approx. 78.9
× 17.3 × 72.0 mm (w/h/d)
(31/8
× 11/16 × 27/8 in.)
MZ-R91
Approx. 78.9
× 18.0 × 72.0 mm (w/h/d)
(31/8
× 23/32 × 27/8 in.)
Mass
MZ-R90
Approx. 105 g (3.7 oz) the recorder only
Approx. 148 g (5.2 oz) incl. a recordable MD,
and NH-14WM nickel metal hydride
rechargeable battery
MZ-R91
Approx. 110 g (3.8 oz) the recorder only
Approx. 153 g (5.4 oz) incl. a recordable MD,
and NH-14WM nickel metal hydride
rechargeable battery
Supplied accessories
AC power adaptor (1)
Headphones with a remote control (1) (RM-MZ2S)
NH-14WM nickel metal hydride rechargeable
battery (1)
Dry battery case (1)
Rechargeable battery carrying case (1)
Carrying pouch (1)
A
Design and specifications are subject to
change without notice.
C plug adaptor (1)
Battery life1)
Batteries
Recording
2)
Playback
NH-14WM
nickel metal
hydride
rechargeable
battery
Approx.
6.5 hours
Approx.
12 hours
LR6 (SG)
(size AA)
Sony alkaline
dry battery
Approx.
4 hours
Approx.
16.5
hours
NH-14WM
nickel metal
hydride
rechargeable
battery
+ One LR6
(SG) (size AA)
Approx.
14.5 hours
Approx.
29 hour
1) The battery life may be shorter due to
operating conditions and the temperature of
the location.
2) When you record, use a fully charged
rechargeable battery.
Model Name Using Similar Mechanism
NEW
Mechanism Type
MT-MZR90-165
Optical Pick-up Name
LCX-2R
Ver 1.1 2000. 02


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­ 2 ­
TABLE OF CONTENTS
1.
SERVICING NOTES ............................................... 3
2.
GENERAL ................................................................... 4
3.
DISASSEMBLY ......................................................... 5
4.
TEST MODE .............................................................. 11
5.
ELECTRICAL ADJUSTMENTS ......................... 18
6.
DIAGRAMS
6-1. Block Diagram ­SERVO Section­ ................................. 23
6-2. Block Diagram ­A/D, D/A CONVERTER,
AUDIO Section ­ ............................................................ 25
6-3. Block Diagram ­KEY CONTROL/DISPLAY/
POWER SUPPLY Section ­ ........................................... 27
6-4. Printed Wiring Board ...................................................... 30
6-5. Schematic Diagram ......................................................... 33
6-6. IC Pin Function Description ........................................... 46
7.
EXPLODED VIEWS ................................................ 53
8.
ELECTRICAL PARTS LIST ............................... 57
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.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0
SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE
DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ
DE FONCTIONNEMENT. NE REMPLACER CES COM-
POSANTS QUE PAR DES PIÈCES SONY DONT LES
NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
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.


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­ 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-2R)
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.
laser-tap
OPTICAL PICK-UP FLEXIBLE BOARD
SECTION 1
SERVICING NOTES
· 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 fas-
tening the hook of the open/close detect switch (S801) 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.
(Refer to Section 5 Electrical Adjustment. (page 18))
· Replacement of CXD2660GA (IC502) and CXR701080-013GA
(IC801) used in this set requires a special tool. Therefore, they
cannot be replaced.
tape
S801
MAIN board
upper panel assy


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­ 4 ­
SECTION 2
GENERAL
· LOCATION OF CONTROLS
­ The recorder ­
1
2
3
5
4
6
7
8
9
qd
0
qa
qs
qf
qg
ql
qh
qj
qk
1
9
2
3
4
5
6
7
8
0
1
3
2
6
7
0
8
9
qa
qs
qd
qf
5
4
1
x (stop) /CHARGE button
2
Display window
3
REC indicator
4
DC IN 3V jack
5
Jog lever
6
i
/LINE OUT (headphones/line out) jack
7
MIC (PLUG IN POWER) jack
8
LINE IN (OPTICAL) jack
9
HOLD switch
Slide to lock the controls of the recorder.
0
N (play) button
qa
X (pause) button
qs
T MARK (track mark) button
qd
REC (record) switch
qf
Battery compartment
qg
VOL (volume) +/­ buttons
qh
OPEN switch
qj
END SEARCH button
qk
./> (search/AMS) buttons
ql
SYNCHRO REC (synchro-recording)
ON/OFF switch
1
Character information display
Displays the disc and track name*,
date, error messages, track numbers,
etc.
* Disc and track names appear only
with MDs that have been
electronically labeled.
2
MONO(monaural) indication
3
Disc name/track name indications
Appears when labeling disc or track
respectively.
4
Play mode indication
Shows the play mode of the MD.
F
(all repeat): All tracks play
repeatedly.
F
1(single repeat): One track plays
repeatedly.
F
SHUF(shuffle repeat): Tracks will
be repeated in random
order.
5
SYNC (synchro-recording) indication
Lights up while synchro-recording.
6
Disc indication
Shows that the disc is rotating for
recording, playing or editing an MD.
7
REC indication
Lights up while recording. Flashes
when standing by for recording.
­ The headphones with a remote control (RM-MZ2S) ­
8
Mega bass indication
9
Battery indication
Shows approximate battery condition.
While charging the rechargeable
battery, this indication shows the
charging condition.
0
REMAIN (remaining time/tracks)
indication
Lights up along with the remaining
time of the track, remaining time of the
MD, or remaining number of tracks.
qa
REC DATE (recorded/current date)
indication
Lights up along with the date and time
the MD was recorded. When only
"DATE" lights up, the current date
and time are displayed.
qs
Time display
Shows the elapsed time of the track
being recorded or played.
qd
Level meter
Shows the level of the MD being
played or recorded.
qf
AM/PM indication
Lights up along with the time
indication in the 12-hour system.
1
Headphones
Can be replaced with optional headphones.
2
Stereo mini plug
3
x (stop) button
4
Control
To play, press the control towards
N·> during stop. Press the
control towards N·> during play
to search the beginning of the
succeeding track; hold in this position
to fast-forward. Press towards .
during play to search the beginning of
the preceeding track; hold in this
position to rewind.
5
HOLD switch
Slide to lock the controls of the remote
control.
6
X (pause) button
7
PLAY MODE button
8
DISPLAY button
9
VOL (volume) +/­ buttons
When the AVLS is set to on, you
cannot increase the volume to the
maximum. To increase the volume
above the limited level, set the AVLS
to off using the jog lever.
0
Display window
­ The display window of the recorder ­
This section is extracted from
instruction manual.


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­ 5 ­
PANEL ASSY, BOTTOM
Note: Follow the disassembly procedure in the numerical order given.
SECTION 3
DISASSEMBLY
· This set can be disassembled in the order shown below.
Upper Panel Section
Main Board, "Case Assy, Battery"
LCD Module, "Button, Control", "Service Assy, Upper Panel" (R90/R91)
Main Board, "Case Assy, Battery"
"Chassis Assy, Set",
MD Mechanism Deck (MT-MZR90-165)
Panel Assy, Bottom
Set
Belt Assy, Ornamental
Service Assy, OP
Motor Flexible Board
Motor, DC (Sled) (M602)
"Motor, DC SSM-01C14A (Spindle) (M601)", "Motor, DC (Over Write Head Up/Down) (M603)"
Holder Assy
4
two screws
(1.4)
1
flexible board
(CN801)
5
upper panel section
4
two screws
(1.4)
2
knob (open)
3
UPPER PANEL SECTION
Note: On installation of bottom
panel assy, adjust the posi-
tion of both two switches
(S804, S807) and two
knobs (hold).
S807
S804
4
Close the
battery terminal (plus).
5
two screws
(1.4)
1
Open the
battery case lid.
3
battery case lid
6
Remove the bottom panel assy
in the direction of arrow A.
A
5
two screws
(1.4)
knob (hold)
5
screw (1.4)
2
two claws