Search found 783 matches

by Rasputin
Tue Sep 17, 2019 5:45 pm
Forum: HELP!
Topic: JX-8P Displays "Roland JX-8P 12"
Replies: 5
Views: 2338

Re: JX-8P Displays "Roland JX-8P 12"

After transporting my JX-8P home, it just hangs on the "Roland JX-8P 12" screen. When I disconnect all cables from the power supply and turn it on the voltage increases on the 15v rail to about 24v and stays there. Never had that issue, but it seems like you're barking up the right tree for this. J...
by Rasputin
Tue Sep 17, 2019 6:33 am
Forum: HELP!
Topic: JX3P just plays single repeating tone and some of the buttons change it?
Replies: 12
Views: 3195

Re: JX3P just plays single repeating tone and some of the buttons change it?

It's predictably like this between power cycles. 14 and 16 are interesting because the 0 light blinks as well in time with the front panel LEDs. The rate of blinking on the pulse light seems to vary. It occurred to me that measuring the output side of IC46 isn't going to work well because you're es...
by Rasputin
Sat Sep 14, 2019 8:47 pm
Forum: HELP!
Topic: JX3P just plays single repeating tone and some of the buttons change it?
Replies: 12
Views: 3195

Re: JX3P just plays single repeating tone and some of the buttons change it?

I love how relatively simple these machines are, almost crudely simple compared to a modern computer, to the point that I feel like I could actually understand what it's doing. All the input pins are constantly high. 11-18 output pins are high with some blinking between 0 and 1. 20 is high. 19 is n...
by Rasputin
Mon Sep 09, 2019 2:32 pm
Forum: HELP!
Topic: JX3P just plays single repeating tone and some of the buttons change it?
Replies: 12
Views: 3195

Re: JX3P just plays single repeating tone and some of the buttons change it?

Some of the pins on the other side of IC46 stay on 1 but go to 0 for a fraction of a second before each iteration of the repeating sound (if that makes sense). To begin to answer that, it might be helpful to look at some theory of operation. Snooze... :D THEORY OF OPERATION What is IC46 and why sho...
by Rasputin
Sun Aug 25, 2019 6:26 am
Forum: HELP!
Topic: Yamaha DX7 Pitch Bend not working
Replies: 3
Views: 1937

Re: Yamaha DX7 Pitch Bend not working

Tiltrelia wrote:
Sun Aug 25, 2019 12:55 am
Just to restate, the pitch bend wheel works when using the DX7 as a MIDI controller for a softsynth.
Pitch bend range set to 0 in the DX Function Mode?
by Rasputin
Mon Aug 19, 2019 12:13 am
Forum: HELP!
Topic: EPS16 in need of HxC/Gotek but which one?
Replies: 4
Views: 1467

Re: EPS16 in need of HxC/Gotek but which one?

blueknob wrote:
Sun Aug 18, 2019 7:22 pm
Do you know what type spec of Gotek, HxC unit I need?
Mr. Blue, sir...

http://zine.r-massive.com/floppy-emulat ... udio-gear/

This explains it all.
by Rasputin
Sun Aug 11, 2019 4:13 pm
Forum: HELP!
Topic: JX3P just plays single repeating tone and some of the buttons change it?
Replies: 12
Views: 3195

Re: JX3P just plays single repeating tone and some of the buttons change it?

I guess that eliminates the front panel from causing the issue? Unless it requires a certain signal from the front panel board to disengage the test mode? Not so much a signal from the panel board to disengage test mode, but more that the mainboard sees buttons 1-6 and 9 (either individually or any...
by Rasputin
Sun Aug 11, 2019 1:23 am
Forum: HELP!
Topic: Korg Trident MK1 capacitor 4700 uf 25v
Replies: 3
Views: 1752

Re: Korg Trident MK1 capacitor 4700 uf 25v

HI. Where can i buy 470 uf 25v -40 85c S capacitor to Korg Trident MK1 Anywhere that sells electronics supplies, really. Digikey, Mouser, Arrow, Radio Shack :lol:, whatever... I don't know if you meant 4700 uF or 470 uF, but if you intended 4700uf then Nichicon UHE1E472MHD would probably be a part ...
by Rasputin
Sun Aug 11, 2019 1:10 am
Forum: HELP!
Topic: JX3P just plays single repeating tone and some of the buttons change it?
Replies: 12
Views: 3195

Re: JX3P just plays single repeating tone and some of the buttons change it?

Spitballin' here, so this could be wildly inaccurate, but it's something to think about at least. One of the seven JX3P tone select buttons is stuck on, either physically/mechanically or electrically. This would force the JX3P into test mode at every power on event. It may be possible to disengage t...
by Rasputin
Thu Aug 08, 2019 10:23 pm
Forum: HELP!
Topic: JX-8P getting stuck on "Roland JX-8P 12"
Replies: 2
Views: 1119

Re: JX-8P getting stuck on "Roland JX-8P 12"

I suspect a possible crack on a solder joint since moving it fixes the issue, but I do not see anything on the board. Any suggestions? When it's in a state of failure, use a plastic spudger, chopstick, or other pointed device which is not conductive and probe around until it (hopefully) comes back ...
by Rasputin
Tue Aug 06, 2019 10:39 pm
Forum: HELP!
Topic: Roland MKS-50 Issues
Replies: 1
Views: 1165

Re: Roland MKS-50 Issues

Refer to this thread for the gist of what you are likely dealing with: viewtopic.php?f=5&t=78204
by Rasputin
Sat Aug 03, 2019 9:44 pm
Forum: HELP!
Topic: Ensoniq EPS "disc not formatted" error
Replies: 14
Views: 6763

Re: Ensoniq EPS "disc not formatted" error

merovie wrote:
Thu Aug 01, 2019 3:28 pm
I am still interested in the gotek but I'd like to know how to transfer my old sequences and songs and sounds from floppy to the USB.
Just use Omniflop to rip your old floppies to a computer then use the produced images with a floppy emulator. Problem solved.
by Rasputin
Wed Jul 31, 2019 5:08 pm
Forum: HELP!
Topic: FIXED - JX8P button issues
Replies: 2
Views: 1779

Re: JX8P button issues

While I was putting the board back into it, the back side made contact with one of the brass standoffs and sparked. I'm not sure what part of this repair or reassembly required working on it while powered on, but... :-? I would probably start by checking the switch matrix driver (IC4 - TC40H245P) o...
by Rasputin
Sun Jul 21, 2019 6:55 pm
Forum: HELP!
Topic: Yamaha dx100 blank display
Replies: 9
Views: 3413

Re: Yamaha dx100 blank display

I don't know where to find it. I'm pretty sure these jacks will fit most Yamaha mono jacks (output, footswitch) of the era, like the DX, RX and TG series. I can't guarantee it, but I know they are 3-pin PCB mount, and if your original jack has that "black front with red rear" color scheme then they...
by Rasputin
Sat Jul 20, 2019 4:31 pm
Forum: HELP!
Topic: Yamaha dx100 blank display
Replies: 9
Views: 3413

Re: Yamaha dx100 blank display

But now, about that output cutting off issue... If you didn't notice any cold solder joints on the intermittent jack, yet the jack functions okay when fiddling with it then there are two potential problems which come to mind: 1) The metal contacts are corroded and wiggling the plug within the jack ...