Sony Walkman MZ-R900 Service Manual

SERVICE MANUAL
Ver 1.2 2001. 03
US and foreign patents licensed from Dolby
Laboratories Licensing Corporation.
Audio playing system
MiniDisc digital audio system
Laser diode properties
Material: GaAlAs
Wavelength: = 790 nm
Emission duration: continuous
Laser output: less than 44.6 W
(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
When using MDW-80:
Maximum 160 min. in monaural
Maximum 320 min. in stereo
Revolutions
350 rpm to 2,800 rpm (CLV)
Error correction
ACIRC (Advanced Cross Interleave Reed
Solomon Code)
Sampling frequency
44.1 kHz
Sampling rate converter
Input: 32 kHz/44.1 kHz/48 kHz
Coding
ATRAC (Adaptive TRansform Acoustic
Coding)
ATRAC3 — LP2
ATRAC3 — LP4
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
Sony Corporation
9-927-991-13
2001C0500-1 Audio Entertainment Group
C 2001.3 General Engineering Dept.
Photo: Red type
Model Name Using Similar Mechanism
Mechanism Type
Optical Pick-up Name
SPECIFICATIONS
Wow and Flutter
Below measurable limit
Inputs
Microphone: stereo mini-jack, minimum input
level 0.25 mV
1)
Line in : stereo mini-jack, minimum input
level 49 mV
1)
Optical (Digital) in : optical (digital) mini-jack
Outputs
2)
i/LINE OUT : stereo mini-jack
headphones/earphones: maximum output
level 5 mW + 5 mW, load impedance 16 ohm
LINE OUT: 194 mV, load impedance 10
kilohm
1) The LINE IN (OPT) jack is used to connect
either a digital (optical) cable or a line
(analog) cable.
2) The i/LINE OUT jack connects either
headphones/earphones or a line cable.
Power requirements
Sony AC Power Adaptor connected at the DC
IN 3V jack:
120 V AC, 60 Hz (US model)
230–240 V AC, 50/60 Hz (UK and Hong
Kong model)
220–230 V AC, 50/60 Hz (European model)
120 V AC, 50 Hz (Canadian model)
240 V AC, 50 Hz (Australian model)
220 V AC, 50 Hz (Chinese model)
110/220 V AC, 60 Hz (Korean model)
100–240 V AC, 50/60 Hz (Other models)
Nickel metal hydride rechargeable battery NH-
14WM
LR6 (size AA) alkaline battery
PORTABLE MINIDISC RECORDER
MZ-R900
US Model
Canadian Model
AEP Model
UK Model
Australian Model
Chinese Model
Tourist Model
Battery operation time
1)
Battery life
2)
When recording
(Unit: approx.hours)(EIAJ
Batteries Stereo
NH-14WM 8
nickel metal
hydride
rechargeable
4)
battery
LR6 (SG) 7
Sony alkaline
5)
dry battery
NH-14WM 19
nickel metal
hydride
rechargeable
4)
battery
+ One LR6
(SG) 5)
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. Recording time may
differ according to the alkaline batteries.
– Continued on next page –
E Model
NEW
MT-MZR900-171
LCX-4R
3)
)
LP2 LP4
10.5 13
10 14
26 30