Sony MDS-JB940


Name MDS-JB940
Manufacturer Sony
Released 2000/09
Device type deck
Recorder Recorder
NetMD No
Hi-MD No
Radio No
Dimensions 430×110×287mm
Weight 5.3kg
ATRAC ver Type-R
Battery No
Sidecar battery No
Voltage 120
Power cable AC
Price (launch)
¥69 000
Inputs RCA in, Digital optical (TOSLINK), Digital coaxial
Outputs 1/4 inch headphone, RCA out, Digital optical (TOSLINK), Digital coaxial
Control PS/2 keyboard


  • Upper middle class home MD deck.
  • ATRAC with Type-R DSP W/ MDLP recording modes
  • 4x CD → MD recording
  • Scale Factor Edit
  • Playback Pitch Control
  • Variable coefficient 24-bit digital filter and S-TACT circuitry
  • Sony Megastorage CD Changer Control
  • New USB based PC-Link kit - the PCLK-MN10 (MSRP: ¥15,000)
  • R-Core Power Transformer
  • TOC Cloning possible.

Specs: SNR > 100dB, Dynamic range: > 98dB, THD: <.003%, 24bit delta-sigma ADC, Current pulse DAC.

Improved over MDS-JB640:

  • Extra button on front panel: digital filter (no S.F. edit button, only accessible through menu system)
  • Recording level dial on front panel
  • Extra buttons on 5-column remote control: date recorded, date present, numeric 11-25, music scan, auto space, peak hold, filter, CD player pause, name (name, character, number), play modes (continue, shuffle, program), time.
  • Coaxial input appears on all models, as does 2 optical inputs.
  • Digital filter appears in display modes while stopped, playing and recording. Pitch level appears when stopped and playing.
  • Clock setting, and time/date stamp for recordings.
  • Bit-length switching. Used to improve the digital output quality, by changing the outgoing bit-length.
  • Digital filter changes the tone of the signal going through the analog output.
  • Aluminium front panel, and is also of QS design. This means that the circuitboards inside are on a slant, reducing standing waves (unwanted reverberation), and it gets a nice shiny QS sticker on it.

MD Mechanism: MDM-7A
Optical Pick-up: KMS-260B/J1N

Content adapted from: Sony Press Release page Sony Product Park Sony 2000 home audio catalog

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raymate, 2021/06/12 13:33
Anyone got any tips for this one, mine had just started to not eject discs, it tries but they go back in and just read again. Unit plays fine. If I remove the lid I can nudge the disc during the eject process and it will eject. Cant see what I need to tinker with to help the situation.
test86.190.50.138, 2022/09/09 10:12
Eject belt replacement time for you xx
kgallen, 2021/06/14 11:49, 2021/06/14 11:50
Sounds like the eject belt - it's an MDM7 series drive and there is a 17mm x 0.8mm belt that can go slack.

Get from Charles Holt cnh_03 on eBay (he had these made for this drive at my suggestion):
test67.187.170.194, 2022/10/02 06:22
Needa eject belt for my Minidisc Deck JB940. Hope you have one I can Buy.
test67.187.170.194, 2022/10/02 06:24
Need new Minidisc Deck Eject belt for my Minidisc Deck JB 940.
defor, 2023/11/08 05:38
Can someone clarify the source for "New USB based PC-Link kit - the PCLK-MN10 (MSRP: ¥15,000)"?
This deck uses Control-A1 II ports, and as such is not compatible with the MN10, and should instead be used (in the Sony infrastructure) with an interface such as the PCLK-PC1 or PCLK-PC2.
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  • equipment/sony/deck/mds-jb940.txt
  • Last modified: 5 months ago
  • by jdub