Drive belt replacement for MITSUMI D357B Floppy Disc Driveįloppy drives from the late 1980s and early 1990s often used belt drives to connect the drive motor (top right corner) to the floppy disk itself (middle left - large black plastic flywheel). It was a much simpler design than other floppy disks of the time as it had no shutter mechanism to protect the disk surface from dust and used break-off tabs (rather than a sliding tab) for write-protection. The synthetic rubber belt which connects the motor to the disk flywheel tends to go either loose (as in this case), or to dissolve into a sticky goo. Un disco flexible o también disquete (en inglés floppy disk), es un tipo de dispositivo de almacenamiento de datos formado por una pieza circular de material magnetico que permite la grabación y lectura de datos, fino y flexible (de ahí su denominación) encerrado en una carcasa fina cuadrada o rectangular de plástico. The 'plasticisers' used to make things soft and springy have a limited life-time (evaporation of volatile compounds, effect of UV light, etc) and so drive belts either go loose or brittle - SY99 drive belts seem to go loose or even dissolve. The SY99 shown here is from 1991, and so was about 13 years old in 2004. You can get replacement belts with the correct dimensions and tension from: The drive belt was so loose that the motor no longer turned the plastic fly wheel, and so the drive did not work. 'windchest' on ebay sometimes has them.Alternative link to web-site for 'windchest'.Radio Shack / Tandy item FZR-9.1 is apparently suitable (not verified by me).If you know of any other suppliers or sources of supply, then please let me know. You can try replacing the drive belt with a similar sized elastic band for a temporary fix, but it is much better to find a replacement of the right dimensions so that it is neither too tight or too loose (both conditions are likely to prevent the drive from working reliably). Unlike many cassette deck drive belts, the belt used in the SY99 drive is flat instead of square, and is more like the belt used in belt driven record decks of the same vintage. If you do use an exastic band for a temporary fix, then you should first verify the correct operation of the drive by formatting a blank floppy disk, then saving a song to it, and then checking that the song can be loaded. Only when this works correctly and reliably should you use the floppy drive.Only when this works correctly and reliably should you use the floppy drive.
If you know of any other suppliers or sources of supply, then please let me know.Radio Shack / Tandy item FZR-9.1 is apparently suitable (not verified by me).Alternative link to web-site for 'windchest'.You can get replacement belts with the correct dimensions and tension from: The drive belt was so loose that the motor no longer turned the plastic fly wheel, and so the drive did not work.
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