Yamaha Electone HX- Manuals

Page 2 - Numbering of the interface; source

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...

Page 4 - Changing drive select; and ‘SEL1

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...

Page 8 - Put the plastic end of the connector on top , keep all in place:

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-…...

Page 9 - M odifying the signal at pin 34

You need a tool (pincer) to set the cable on the connector’s contacts: Be gentle and patient, don’t force.When all is set, I advice you to use a measuringmeter to check of the contacts are ok. Obviously, you could do without all this by cutting wire 10 and 12 within the flatcable, switching themarou...

Page 10 - M odifying the signal at pin 2

The following part requires you to do some measuring at the floppy switches. You can do that bysupplying voltage to the drive and measure what happens at the switches when you insert a floppy. Youcould do without measuring and do this based on trial and error but I recommend that you measure thevolt...

Page 11 - Using an invertor; As discussed earlier, the following signals are needed:

correct values at pin 2, cut the circuitwire of pin 2 (if used), measure at the switch to make themodifications:At pin 2, the MDR controler wants to know the density of the floppy: High denity or Doubledensity. The drive can tell because of the gap (or not) in the floppy disk. Gap means high density...

Page 13 - Reply; Reply; Reply

drawingboard if it doesn’t work yet. Once your new MDR is up and running you will probably notice that the drive’s LED is continiously on.That is a “feature” of the floppy drive. It doesn’t affect the operating of the drive. Thanks to Yvonne Sprenger for providing this information which made it poss...

Page 14 - Yvonne Sprenger

Yvonne Sprenger by Yvonne Sprenger October 1, 2009 at 3:35 pm Reply Hello Yvonne, It is based on your information. I just made a variation on the invertor. The rest is the same.Thanks for that information by the way, I could repair my EL90 with that! Ton by tonnemansblog October 12, 2009 at 1:28 pm ...

Page 15 - Leave a Reply

6. Ton – your method works fine for the EL70 – Ihave just finished your modification and the newfloppy drive works in the EL70. The problem for me was that the integrated circuit you specified74ls00 is no longer available in our local store and I did not understand the numbering. Once Iworked out it...

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Yamaha Electone HX- Manuals

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