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MICROFILM
SERVICE MANUAL
MINI DISC DECK
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SPECIFICATIONS
MDS-JB920
Model Name Using Similar Mechanism MDS-JE520
MD Mechanism Type MDM-5A
Optical Pick-up Type KMS-260A/J1N
System MiniDisc digital audio system
Disc MiniDisc
Laser Semiconductor laser (λ=780nm)
Emission duration: continuous
Laser output Less than 44.6 µW*
* This output is the value measured at a
distance of 200 mm from the objective lens
surface on the Optical Pick-up Block with 7
mm aperture.
Laser diode properties Material: GaAIAs
Revolutions (CLV) 400 rpm to 900 rpm
Error correction Advanced Cross Interleave Reed
Solomon Code (A CIRC)
Sampling frequency 44.1 kHz
Coding Adaptive Transform Acoustic Coding
(ATRAC)
Modulation system EFM (English-to-Fourteen Modulation)
Number fo channels 2 setero channels
Frequency response 5 to 20,000 Hz ±0.3 dB
Signal-to-noise retio Over 100 dB during playback
Wow and flutter Below measureble limit
U.S. and foreign patents licensed form Dolby Laboratories
Licensing Corporation.
Inputs
jack input Rated Minimum
type impedance input input
LINE (ANALOG) phono 47 kilohms 500 mVrms 125 mVrms
IN jacks
DIGITAL Square Optical wave
OPTICAL IN1 optical length: — —
connector 660 nm
jack
DIGITAL Square Optical wave
OPTICAL IN2 optical length: — —
connector 660 nm
jack
DIGITAL Phono 75 ohms 0.5 Vp-p —
COAXIAL IN jack ±20%
Outputs
jack type Rated output Load impedance
PHONES Stereo 28 mW 32 ohms
phone jack
LINE (ANALOG) Phono 2 Vrms Over
OUT jacks (at 50 kilohms) 10 kilohms
DIGIRAL Square –18 dBm Optical wave
OPTICAL OUT optical length:
connector 660 nm
jack
DIGITAL Phono 0.5 Vp-p 75 ohms
COAXIAL OUT jack (at 75 ohms)