Yamaha Electone HX- User Manual
Yamaha Electone HX– User Manual, read for free online in PDF format. We hope this helps you resolve any issues you may have. If you have further questions, please contact us through the contact form.
Table of Contents:
- Page 2 – Numbering of the interface; source
- Page 4 – Changing drive select; and ‘SEL1
- Page 8 – Put the plastic end of the connector on top , keep all in place:
- Page 9 – M odifying the signal at pin 34
- Page 10 – M odifying the signal at pin 2
- Page 11 – Using an invertor; As discussed earlier, the following signals are needed:
- Page 13 – Reply; Reply; Reply
- Page 14 – Yvonne Sprenger
- Page 15 – Leave a Reply
- Page 16 – Notify me of follow-up comments via email.; Pages; Modifiying a FDD for a Yamaha EL90; Categories; Technical; Archives; Blogroll; Register
Modifiying a FDD for a Yamaha EL90
Disclaimer: use this information at your own responsibility. No responsibility is accepted by me for any
damage as a result of using this information.
The information on this page is intended for users of a Yamaha Electone EL90 or EL70 organ with
a broken diskdrive (M DR drive). In order to use this information you should have (basic) knowledge
of electronics. You should also be able to use a solder-iron and you should be able to use a voltage-
meter
Recently, I bought a Yamaha Electone EL90 organ. Used ofcourse. I was completely happy with it, until 3
days later: The MDR broke down, all of a sudden. The message in the MDR ‘display’ showed “Fort”
(format) and “Bad”. None of the floppy’s could be read anymore. Also, writing and formatting didn’t work
anymore. All it said was “Fort” and “Bad”.
I knew that an EL90 MDR wasn’t the same as a PC floppydrive. I remembered reading an article about that
on
Electone Zone
. My drive’s problem was not a stuck spring which determines a HD or DD disk. My
drive’s problem was that it was really broken. I had to look for a way to replace it.
I was lucky to find a webpage of Yvonne Sprenger (
click here for that page
) in which she explains her
findings about the Yamaha MDR drive compared to a regular PC drive. That information eventually got me
to modify a PC fdd so it could be used as an MDR drive. However, I made some changes in Yvonne’s
setup, especially where a sensor signal needs to be inverted.
What needs to be changed?
The flatcable has to put in reversed in the MDR controler
The drive-select of the new FDD has to be set to “0
″
instead of “1
″
. This can be done by a twist in
the flatcable, or by modifying the FDD
The disktype (HD or DD) needs to be sent to the MDR controler on pin 2
The signal “Disk Ready” needs to be sent to the MDR controler on pin 34
The information on this page may overwelm you and discourage you. Don’t let it discourage you. Most of
6/4/2011
Modifiying a FDD for a Yamaha EL90 «…
…wordpress.com/modifiying-a-fdd-for-…
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Summary
the information is just background information. Please read it all and understand what the modification isall about. At the end you will see that the modifications aren’t that complicated. Again, basically all this information was found out by Yvonne, so she deserves all the credits!! All Iexplain h...
So what needs to be done: Turn the connector at the controler-side so that the blue/red wire goes to pin 34(which, as we know now, is electronically pin 1). If it doesn’t go in because of the thickning in the middleof the connector, use a sharp knife to remove that plastic there (carefull!). Obvious...
Then, twist the cable: 12 becomes 10, 10 becomes 12, 11 remains 11: Put the cable PERFECTLY alligned in the connector’s contacts. Check. DOUBLE check. Put the plastic end of the connector on top , keep all in place: 6/4/2011 Modifiying a FDD for a Yamaha EL90 «… …wordpress.com/modifiying-a-fdd-for-…...
