Sony MZ-R90/R91 User Manual
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MZ-R70
SERVICE MANUAL
PORTABLE MINIDISC RECORDER
Model Name Using Similar Mechanism
MZ-R90/R91
Mechanism Type
MT-MZR70-165
Optical Pick-up Name
LCX-2R
(Photo: Silver)
System
Audio playing system
Audio playing system
MiniDisc digital audio system
Laser diode properties
Material: GaAlAs
Wavelength:
Wavelength:
λ
= 790 nm
Emission duration: continuous
Laser output: less than 44.6
Laser output: less than 44.6
µ
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.)
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)
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)
Code (ACIRC)
Sampling frequency
44.1 kHz
Sampling rate converter
Input: 32 kHz/44.1 kHz/48 kHz
Coding
Adaptive TRansform Acoustic Coding
(ATRAC)
(ATRAC)
Modulation system
EFM (Eight to Fourteen Modulation)
Number of channels
2 stereo channels
1 monaural channel
1 monaural channel
SPECIFICATIONS
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) mini-
jack
mV
Line in: stereo mini-jack, 69–194 mV
Optical (Digital) in: optical (digital) mini-
jack
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
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
Power requirements
Sony AC Power Adaptor (supplied)
connected at the DC IN 3 V jack:
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)
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)
Nickel cadmium rechargeable battery
NC-WMAA (supplied)
LR6 (size AA) alkaline battery (not
supplied)
NC-WMAA (supplied)
LR6 (size AA) alkaline battery (not
supplied)
Battery operation time
Battery life
Battery life
1)
Batteries
Recording
2)
Playback
NC-WMAA
Approx.
Approx.
nickel cadmium
3 hours
6.5 hours
rechargeable
battery
LR6 (size AA)
battery
LR6 (size AA)
Approx.
Approx.
Sony alkaline
3 hours
3)
17 hours
dry battery
1)
The battery life may be shorter due to
operating conditions and the temperature
of the location.
operating conditions and the temperature
of the location.
2)
When you record, use a fully charged
rechargeable battery.
rechargeable battery.
3)
Recording time may differ according to
the alkaline batteries.
the alkaline batteries.
– Continued on next page –
US Model
Canadian Model
AEP Model
UK Model
E Model
Australian Model
Chinese Model
Tourist Model
US and foreign patents licensed from Dolby
Laboratories Licensing Corporation.
Laboratories Licensing Corporation.