Search found 56 matches

by Werecow
Sun Mar 26, 2017 3:15 am
Forum: HELP!
Topic: Name of Instrument Jack Mounting Nut?
Replies: 5
Views: 1467

Re: Name of Instrument Jack Mounting Nut?

That appears to be a stepped nut.
by Werecow
Sat Dec 31, 2016 7:12 pm
Forum: HELP!
Topic: JX-3P with Skipping Fader
Replies: 76
Views: 8370

Re: JX-3P with Skipping Fader

You´re right, but I´m referring to the smaller tab beneath it, on the left. It takes the 5V. The other one on the right is the wiper tab, linked to R95. The area in between doesn´t look clean, or it´s cracked. Zoom in the original photo on page two. I've zoomed and enhanced that part of the photo, ...
by Werecow
Sat Dec 31, 2016 6:42 pm
Forum: HELP!
Topic: JX-3P with Skipping Fader
Replies: 76
Views: 8370

Re: JX-3P with Skipping Fader

Flexing the board would separate both tabs. I think that large tab is only connected to the metal frame of the slider, and is already solidly grounded at the other end. As for the bender, it could also be losing the +5V. Hard to tell, because the OP wasn't looking for board flex before. The bender ...
by Werecow
Sat Dec 31, 2016 6:23 pm
Forum: HELP!
Topic: JX-3P with Skipping Fader
Replies: 76
Views: 8370

Re: JX-3P with Skipping Fader

Mooger5 wrote:Didn´t the OP measure around 5V at pin 16 earlier?
Yes, but it's an intermittent problem. Can't take any measurement in that area for granted -- it may be there one time, not the next, depending how the board is flexed.

Edit: It also depends which side of W154 the +5 is being fed from.
by Werecow
Sat Dec 31, 2016 5:03 pm
Forum: HELP!
Topic: JX-3P with Skipping Fader
Replies: 76
Views: 8370

Re: JX-3P with Skipping Fader

DC voltage @ W154 [...] Use the multimeter to find what point on the slider is the same. Jump the corresponding points. Before doing that, make sure you set the slider somewhere below maximum; otherwise, you'll read ~+5 on two points (the +5V end and the actual "sliding" connection). Also, it could...
by Werecow
Sat Dec 31, 2016 2:23 pm
Forum: HELP!
Topic: JX-3P with Skipping Fader
Replies: 76
Views: 8370

Re: JX-3P with Skipping Fader

I don't believe I have an extra resistor on hand, but I can go ahead and place an order for a replacement.. Unless Radioshack were to have one similar. I'm happy some progress has been made, me pushing on the PCB itself rules out a lot of other possibilities. My apologies for not doing so from the ...
by Werecow
Fri Dec 30, 2016 8:54 pm
Forum: HELP!
Topic: JX-3P with Skipping Fader
Replies: 76
Views: 8370

Re: JX-3P with Skipping Fader

For a quick test, try flipping the slider. Tack on wires, if you have to. ** Just be sure you get the sliding contact going to the right place, or you'll short the +5V to ground. ** If your slider dead spot moves to LEDs #6 thru 8 -- and I know you don't want to hear this -- it's bad. If that doesn'...
by Werecow
Fri Dec 30, 2016 8:53 pm
Forum: HELP!
Topic: JX-3P with Skipping Fader
Replies: 76
Views: 8370

Re: JX-3P with Skipping Fader

I don´t know man, there's an issue with a slider and a resistor of the wrong value is found next to it? I´d replace it ASAP :) The sense and the bender go through separate input channels. The resistor is there to limit current. At 10k instead of 100k the mux is getting ten times more current than i...
by Werecow
Fri Dec 30, 2016 6:18 pm
Forum: HELP!
Topic: Roland JX-305 Pitch bender LFO / Version
Replies: 1
Views: 1036

Re: Roland JX-305 Pitch bender LFO / Version

If the JX-305 is similar to the JP-8000 from a year earlier, running the Test Mode and/or resetting can fix a multitude of problems. The bender/mod limits are stored in memory and can get corrupted, causing either control to fail; running the test (#11) resets them, and also displays the values the ...
by Werecow
Sun Dec 04, 2016 3:53 pm
Forum: HELP!
Topic: Yamaha DX7 Faulty/Defectuous powerplug/internal transformer
Replies: 49
Views: 22252

Re: Yamaha DX7 Faulty/Defectuous powerplug/internal transfor

Here´s a pic. There are two additional components (I can´t read them. VDRs?) in series with the black wire. All appear to be fine. There is also the voltage selector, so this model must be "universal". There is no return path for dc but as it´s b locked by the non polarized cap it creates a thump (...
by Werecow
Sun Dec 04, 2016 2:48 am
Forum: HELP!
Topic: Need advice on a good soldering station (answered)
Replies: 18
Views: 5898

Re: Need advice on a good soldering station

I have to put in a good word for an older Weller station, the WSD81. Our factory started using these in production in 1996, and they're still going strong today. Of course, they're a tad more rare now, but also cheaper than when new, and well worth picking up on ebay. Tips are cheap and rarely go ba...
by Werecow
Sun Dec 04, 2016 2:28 am
Forum: HELP!
Topic: Juno-60 : LFO Always on Auto : Solved :D
Replies: 70
Views: 7085

Re: Juno-60 : LFO Always on Auto

That's pretty cool you're doing a BA! Maybe they'll let you borrow an old 15MHz dual channel analogue scope? That will be all you need. They'll probably have logic analyzers lying around too. IME the techs like to hang on to the old stuff, if only to demonstrate how well made the gear is! Also they...
by Werecow
Sun Dec 04, 2016 2:04 am
Forum: HELP!
Topic: Juno-60 : LFO Always on Auto : Solved :D
Replies: 70
Views: 7085

Re: Juno-60 : LFO Always on Auto

A clarification: I don't think madtheory was talking about pin 1 of IC9 specifically (it's not really interesting, since it's tied to ground), just as a general troubleshooting guide. In this case, the point of interest is pin 12, the Q output for the auto/manual latch. That should toggle between h...
by Werecow
Sun Dec 04, 2016 1:22 am
Forum: HELP!
Topic: What is the purpose of "Recapping" a synth??
Replies: 55
Views: 10606

Re: What is the purpose of "Recapping" a synth??

AKA polymer caps. Ya. They won't physically fit in an electronics device from the seventies, well, not without a lot of messing about. And for PSU, line filtering and switch filtering, they would have the wrong electrical characteristics. Obviously these were used in hi-end products. Ah, so you're ...
by Werecow
Sat Dec 03, 2016 10:47 pm
Forum: HELP!
Topic: JD 800 Cursor buttons not working.
Replies: 2
Views: 867

Re: JD 800 Cursor buttons not working.

ronniecruisin wrote:Hi. All. This problem is fixed.
Could you post your fix, just in case others run into the same problem?