Sony MZ-R55 Service Manual
MICROFILM
MZ-R55
SERVICE MANUAL
Ver 1.5 2001. 01
With SUPPLEMENT-1
(9-924-964-85)
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 = 780 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 74 minutes (MDW-74, stereo
recording)
Maximum 148 minutes (MDW-74, monaural
recording)
Revolutions
400 rpm to 900 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
US Model
Canadian Model
AEP Model
UK Model
E Model
Australian Model
Tourist Model
Model Name Using Similar Mechanism NEW
MD Mechanism T ype MT-MZR55-161
Optical Pick-up T ype KMS-280A
Frequency response
20 to 20,000 Hz ± 3 dB
Wow and Flutter
Below measurable limit
Inputs
Microphone: stereo mini-jack, 0.22-0.78 mV
Line in: stereo mini-jack, 69-194 mV
Optical (Digital) in: optical (digital) mini-jack
Outputs
Headphones: stereo mini-jack, maximum
output level 5 mW+ 5 mW, load impedance
16 ohm
Line out: stereo mini-jack, 194 mV, load
impedance 10 kilohm
General
Power requirements
Sony AC Power Adaptor (supplied)
connected at the DC IN 3V jack:
120 V AC, 60 Hz (US model)
220-240 V AC, 50/60 Hz (Hong Kong model)
100-240 V AC, 50/60 Hz (Tourist model)
Nickel metal hydride rechargeable battery NH-14WM (supplied)
Two LR6 (size AA) alkaline batteries (not supplied)
– Continued on next page –
PORTABLE MINIDISC RECORDER
– 1 –
Battery operation time
Batteries Recording Playback
NH-14WM nickel Approx. Approx.
metal hydride
rechargeable battery
Two LR6 (SG) Approx. Approx.
Sony alkaline dry batteries 5 hours 10 hours
NH-14WM + Two LR6 (SG)
Dimensions
Approx. 78.9 × 18.9 × 84 mm (w/h/d)
(3 1/8 × 3/4 × 3 3/8 in.)
Mass
Approx. 147 g (5.2 oz) the recorder only
Approx. 190 g (6.7 oz) incl. a recordable MD,
and NH-14WM nickel metal hydride rechargeable battery
Supplied accessories
AC power adaptor AC-MZR55 (1)
Headphones with a remote control
MDR-A34SP (US model)/MDR-E838SP (Hong Kong, Tourist model)
and RM-MZR55 (1)
NH-14WM nickel metal hydride rechargeable battery (1)
Dry battery case (1)
Rechargeable battery carrying case (1)
Carrying pouch (1)
AC plug adaptor (1) (Tourist model only)
Design and specifications are subject to change without notice.
2.5 hours 4 hours
Approx. Approx.
9.5 hours 16 hours
Precautions for Laser Diode Emission Check
When checking the emission of the laser diode during adjustments, never view directly downwards as this may lead to
blindness.
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.
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.
Precautions for Using Optical Pick-up (KMS-280A)
As the laser diode inside the optical pick-up damages by static
electricity easily, solder the laser tap of the Optical pick-up
flexible board when handling. Also take the necessary measures
to prevent damages by static electricity. Handle the Optical pickup flexible board with care as it breaks easily.
Laser tap
Optical Pick-up flexible board
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.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK ! OR DO TTED LINE WITH
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.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!!
LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE ! SUR LES
DIAGRAMMES SCHÉMA TIQUES 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 DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
– 2 –
TABLE OF CONTENTS
1. GENERAL....................................................................... 4
2. SELF-DIAGNOSTIC
2-1. General ..................................................................... 5
2-2. Test Mode Setting..................................................... 5
2-3. Operation in Test Mode Setting ................................ 5
2-4. Releasing the Test Mode........................................... 5
2-5. Self-Diagnostic Mode............................................... 5
2-6. Clearing the Error Indication Code
and Total Recording Time ........................................ 6
3. DISASSEMBLY
3-1. Bottom Panel Assy ................................................... 7
3-2. Connector ................................................................. 7
3-3. Upper Panel Block Assy........................................... 8
3-4. LCD Block Assy....................................................... 8
3-5. Ornamental Belt Block Assy .................................... 9
3-6. Main Board ............................................................... 9
3-7. Chassis (Main) Assy............................................... 10
3-8. OP Block Assy........................................................ 10
3-9. Holder Assy ............................................................ 11
4. TEST MODE
4-1. General ................................................................... 12
4-2. Test Mode Setting................................................... 12
4-3. Test Mode Structure ............................................... 12
4-4. Manual Mode ......................................................... 12
4-5. Overall Adjustment Mode ...................................... 15
4-6. Hybrid Mode, Key Check Mode ............................ 16
5. ELECTRICAL ADJUSTMENTS........................... 17
6. DIAGRAMS
6-1. IC Pin Descriptions ................................................ 21
6-2. Block Diagram – Servo Section – .......................... 25
6-3. Block Diagram – Audio Section –.......................... 27
6-4. Block Diagram – System Control Section –........... 29
6-5. Printed Wiring Board (-11)..................................... 31
6-6. Printed Wiring Board (-12)..................................... 34
6-7. Printed Wiring Board (-13)..................................... 37
6-8. Schematic Diagram – Main Section (1/3) – ........... 40
6-9. Schematic Diagram – Main Section (2/3) – ........... 43
6-10. Schematic Diagram – Main Section (3/3) – ........... 46
7. EXPLODED VIEWS
7-1. Panel Section .......................................................... 54
7-2. Chassis Section ....................................................... 55
7-3. Mechanism Deck Section ....................................... 56
SERVICING NOTE
1) 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 DOOR OPEN switch (S801) with tape.
8. ELECTRICAL PARTS LIST................................... 57
upper panel assy
MAIN board
tape
S801
2) This set is designed to perform automatic adjustment for each
adjustment and write its value to EEPROM. Therefore, when
EEPROM (IC801) has been replaced in service, be sure to perform automatic adjustment and write resultant values to the new
EEPROM.
Refer to page 12 for details.
– 3 –
SECTION 1
GENERAL
This section is extracted from
instruction manual.
– 4 –
SECTION 2
888
ı
Ver ‚.8‚
All ON
All OFF
Microprocessor
version
display
SELF-DIAGNOSTIC
2-1. GENERAL
This set uses the self-diagnostic system in which if an error occurs
in playback/recording 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.
2-2. TEST MODE SETTING
There are two different methods to set the test mode:
1 Short BP801 (TEST) on the main board with a solder bridge
(connect pin @§ of IC801 to the ground). Then, turn on the
power.
–
main board
IC503
IC509
(side B)
–
IC802
BP801
R818
C309
2) Remote controller LCD
• Holding down P allows the current display to be maintained
while it being depressed.
2-4. RELEASING THE TEST MODE
For test mode set with the method 1:
Turn off the power and open the solder bridge on BP801 on the
main board.
For test mode set with the method 2:
Turn off the power.
2-5. SELF-DIAGNOSTIC MODE
1. Go into the test mode.
2. With the unit LCD indicators all flashing, press DISPLA Y key
to go into the self-diagnostic mode.
2 In the normal mode, use the keys on the unit to perform the
following operations:
Press and hold down ( and press the keys below in this turn:
+ n + n =n = n + n = n + n
= n P n P
2-3. OPERATION IN TEST MODE SETTING
When the test mode is set, the LCD shows repeated cycles of the
following display:
1) Unit LCD
ı
All ON
188:88
All OFF
Ver ‚‚.8‚
Microprocessor
version
display
History code
Error indication code
1st ‚ ‚‚
3. Then, eac h time ) ke y is pressed, the reference information
display changes as given below.
1st ‚ XX
1st 1 ‚‚
1st 2 ‚‚
N ‚ XX
N 1 ‚‚
N 2 ‚‚
N-1 ‚ XX
N-1 1 ‚‚
N-1 2 ‚‚
N-2 ‚ XX
N-2 1 ‚‚
N-2 2 ‚‚
REC XXXX
1st ‚ XX
• Press = key to go back to the previous display.
(return)
– 5 –
• Description of History Codes
History code number Description
1st 0 The first error
1st 1
1st 2
N 0 The last error
N1
N2
N-1 0 One error before the last.
N-1 1
N-1 2
N-2 0 Two errors before the last.
N-2 1
N-2 2
REC Total recording time *1)
• Description of Error Indication Codes
Problem Indication code Meaning of code Description
No error 00
Abnormal stop
during recording
Abnormal stop
during playback
Abnormal stop of
recording/playback
caused by power
system
00 indicated
00 indicated
00 indicated
00 indicated
01 Servo error Focus out of alignment.
02 ADIP read error Unable to read the ADIP address.
03 Shock detected during write Jumped by 1.5 tracks or more due to shock during write.
04
11 No focus applied Focus could not be applied.
12 CRC error Unable to read the address.
15 FG error Abnormal rotation of disc.
21 Lower voltage due to overload Power voltage reduced due to overload.
22 Momentary interruption Momentary interruption detected.
23
24 Low power voltage in DSP
Shock detected during
laser down
Lower power voltage in motor Power voltage for motor continuously reduced to less than
system 1V.
*1) Total recording time
Total recording time is recorded in minutes as an index for load to
the OP. It is recorded in hexadecimal format and up to 65,535 min.
(about 886 discs of 74-minute disc) can be counted. It returns to
“0000h” when recorder goes beyond this limit.
Example :REC 000A n Approx. 10 min.
REC 00A0 n Approx. 160 min.
REC 0A00 n Approx. 2560 min.
Abnormal disc RPM.
Attempt to access an abnormal address.
Shock detected when laser was moving down.
2-6. CLEARING THE ERROR INDICATION CODE
AND TO TAL RECORDING TIME
After repair, reset the error indication code.
Reset the total recording time when you have replaced the OP.
1. Go into the self-diagnostic mode. (See page 5.)
2. To reset the error indication code, slide REC c key when
the code is displayed.
(All data including 1st, N , N-1 and N-2 are reset.)
3. T o reset the total recording time, slide REC c key when the
time is displayed.
– 6 –
SECTION 3
y
DISASSEMBLY
Note : This set can be disassemble according to the following sequence.
Bottom
Connector
Panel
assy
Note : Follow the disassembly procedure in the n umerical order given.
3-1. BOTTOM PANEL ASSY
Note) When installing, fit the each positions knobs with switches.
2
precision pan screws (M1.4)
Main Board
Upper Panel
Block assy
LCD Block assy
Ornametal Belt
Block assy
4
bottom panel assy
Main
Board
Chassis (Main)
assy
knobs
OP Block
assy
Holder
ass
3-2. CONNECTOR
3
precision pan screw (M1.4)
switches
1
CN601
3
CN502
1
precision pan screws (M1.4)
2
CN801
– 7 –
3-3. UPPER PANEL BLOCK ASSY
2
precision pan screw (M1.4)
5
3
precision pan screws (M1.4)
7
upper panel block assy
4
step screw (click arm)
0
click arm assy
3-4. LCD BLOCK ASSY
6
1
4
LCD block assy
8
1
precision pan screw (M1.4)
2
tapping screws (1.7)
9
3
claws
– 8 –
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