YamahaDX at Yahoo! Groups

Re: DX21/27/100

John Wardle — Sat, 21 Nov 2009 03:37:45 GMT

My DX21 is Version 1.5 09-Aug-85 John

Re: No sound DX-7 II

Gregg Sheehan — Sat, 21 Nov 2009 01:38:42 GMT

Frank, That's relatively cheap for that obsolete IC. I would buy it as a spare anyway. It's used in lots of keyboards and processors of that era.But don't be

Re: No sound DX-7 II

Frank de Ruiter — Fri, 20 Nov 2009 23:59:35 GMT

Gregg, couldn't reply on your group message because it was quite messed up. But I've read it and had the DX tested with a scope. Almost all inputs had some

Re: No sound DX-7 II

Gregg Sheehan — Fri, 20 Nov 2009 19:42:48 GMT

Does anybody out there, have a scan of the actual schematic of the DX7IID/FD? I remember it was a big honkin' foldout like all Yamaha schematics of the day,

Re: No sound DX-7 II

Gregg Sheehan — Fri, 20 Nov 2009 19:04:10 GMT

Frank Is there coherent activity on the data inputs or change in the waveforms taking place when playing the keyboard? It's dynamic not static, but

Again with the DX27 -- slider pot/knob

GB — Fri, 20 Nov 2009 15:56:23 GMT

Anyone have any leads on where to get a data entry slider and cap (knob) for a DX27 or similar? Mine works but the shaft is sheared off at the panel (so it

Re: No sound DX-7 II

Frank de Ruiter — Fri, 20 Nov 2009 14:07:34 GMT

The 4558 is IC3, so these outputs are good then. The -1V output doesn't change if I press some keys, it stays at -1V. On pin 26 I got 11.96V on pin 28 -12.16V

Re: No sound DX-7 II

narfman96 — Fri, 20 Nov 2009 01:57:52 GMT

If the 4558 was IC3 then it buffers the aftertouch on A (0-5v)and the pitch bend on B at 2.5v. The Dac used is a PCM54HP. Pin-19 (VD) and pin-20 (PR) are

Re: No sound DX-7 II

Frank de Ruiter — Fri, 20 Nov 2009 01:07:32 GMT

Hi Alan, I do have an old Philips scope and a decent DMM with scope function (don't know how to use a scope yet, but at least it is there), so that schouldn't

Re: No sound DX-7 II

Alan Probandt — Fri, 20 Nov 2009 00:44:42 GMT

In 'LogicLand' there are some weird old tricks, some work and some don't. For example, use a 74HC4040 (a 12 step divider, not a 12-step program) to divide

Re: No sound DX-7 II

Gregg Sheehan — Thu, 19 Nov 2009 18:59:21 GMT

Frank, This is where you get out of troubleshooting ability, by not having test gear like DMMs and scopes, for measurement and analysis. A scope is required to

Re: No sound DX-7 II

Frank de Ruiter — Thu, 19 Nov 2009 16:44:12 GMT

Hallo Marco, I have checked it right away. Local setting is on, the DX is initialized so every setting should be ok. The sounds if have loaded through floppy

Re: No sound DX-7 II

Waradmiral — Thu, 19 Nov 2009 16:11:23 GMT

Have you put back the sounds via sysex. And put the setting local on? Have you tried to use an external keyboard ro get sound out of the yamaha? Grtn, Marco

No sound DX-7 II

Frank de Ruiter — Thu, 19 Nov 2009 15:44:35 GMT

Hello, my DX is driving me crazy. First I had the problem with a broken power supply. I did get many tips from this group (everyone a big thanks for that!) but

Re: DX21/27/100

Lee Borrell — Wed, 18 Nov 2009 17:25:12 GMT

Got it - key shift - with power on! ... From: Lee Borrell Subject: Re: [YamahaDX] DX21/27/100 To: YamahaDX@yahoogroups.com Date: