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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
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
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
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)
Nickel cadmium rechargeable battery
NC-WMAA (supplied)
LR6 (size AA) alkaline battery (not
supplied)
Battery operation time
Battery life
1)
Batteries Recording
2)
Playback
NC-WMAA Approx. Approx.
nickel cadmium 3 hours 6.5 hours
rechargeable
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.
2)
When you record, use a fully charged
rechargeable battery.
3)
Recording time may differ according to
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.
Ver 1.3 2001. 01
With SUPPLEMENT-1
(9-927-631-81)