https://electro-music.com/forum/ https://electro-music.com/forum/viewtopic.php?p=458430#458430 Perhaps it's a similar issue with impedance? Is there a trace on the PCB running from the lfo to something affecting the voice perhaps? If so, maybe try cleaning it with some isopropyl? humancalledjohn Sat, 28 Mar 2026 13:08:10 -0700 https://electro-music.com/forum/viewtopic.php?p=458366#458366 hello, i just bought a microwave 1 rev b on ebay which doesn't work :(

i think i have the same problem you once had. heres a video of it when i switch on.


https://www.youtube.com/shorts/oDnAjg5hVo4


its gotten worse now. it doesnt load ... horaciopollard2222 Thu, 19 Mar 2026 00:23:09 -0700 https://electro-music.com/forum/viewtopic.php?p=457518#457518 Don't know if you still have this problem but I've found the information from this site to be useful for solving ground noise problems.

http://pin1problem.com/ SynchronousArts Mon, 01 Sep 2025 12:35:32 -0700 https://electro-music.com/forum/viewtopic.php?p=455418#455418 Ha! Great everything worked out for everyone of you

Just in case, PNP direction is WRONG in schematic you've provided. Be careful. Emitter should pass current from VCC to VEE not vice verse. Peace/. Pourkascheff Sat, 18 May 2024 11:10:40 -0700 https://electro-music.com/forum/viewtopic.php?p=455394#455394 Just heard back from International Power, they said turn R19 & R26 counterclockwise bleekza Thu, 16 May 2024 12:29:39 -0700 https://electro-music.com/forum/viewtopic.php?p=455378#455378 Not really a repair question or idea, more of an opinion poll.


I come by quite a few free older electronic organs/keyboards whilst searching for parts to salvage and have had a fair bit of success in procuring some pretty obscure ICs and compone ... trackhed Fri, 10 May 2024 22:33:58 -0700 https://electro-music.com/forum/viewtopic.php?p=454982#454982 Good job! Airlock Sat, 03 Feb 2024 17:13:14 -0700 https://electro-music.com/forum/viewtopic.php?p=454972#454972 Let's say you were working on your Roland Alpha Juno 1 and took it apart for cleaning. Then things happened, yada yada yada, you never finished it and probably lost track of all of the screws and hardware that kept the keyboard together.

How would ... hyperstationjr Fri, 02 Feb 2024 11:32:49 -0700 https://electro-music.com/forum/viewtopic.php?p=454676#454676 I agree completely.
The most vintage parts work more than fourty years and the modern parts are fault after two weeks.
I don't like the way this thing's going... gregcomposition Wed, 22 Nov 2023 15:33:13 -0700 https://electro-music.com/forum/viewtopic.php?p=454471#454471 Hello y'all :)
I'm trying to fix my old trusty SH101. The power switch was faulty and I replaced with a 6 pin switch (from Vintage Synth Parts). That went quite well and now the drifting pitch problem is resolved and the VCO is stable again.
However ... earo Tue, 17 Oct 2023 10:18:43 -0700 https://electro-music.com/forum/viewtopic.php?p=454404#454404 Tried with a 10nf ceramic, then with a 100n.
Neither of those helped - the damn issue is still there.
And it is still weird, since it works with some clocks… Snaper Tue, 26 Sep 2023 08:46:59 -0700 https://electro-music.com/forum/viewtopic.php?p=454245#454245 Sorry, I don't own a CS-30, but I do have a CS-10 and a CS-20M and once replaced IG00156. In your case, I would probably start by measuring the voltage levels present on the different pins of all the AMP chips (IC9, IC10, IC11). These are three identi ... gregcomposition Mon, 07 Aug 2023 15:54:30 -0700 https://electro-music.com/forum/viewtopic.php?p=454236#454236 I have a weird problem with my Roland M181 keyboard, everything is working fine, except for the portamento.
The portamento actually works fine, the problem is that when you turn up the portamento time, it transposes the entire keyboard down.
With th ... Dragon's Lair Fri, 04 Aug 2023 13:09:13 -0700 https://electro-music.com/forum/viewtopic.php?p=453595#453595 Hi everybody, i'm Jeremy from France, i just bought a Korg Mini Pops 7 for 650€ a few days ago, everything is working but the Quijada instrument is not sounding as it should, it does "trr" instead of "trrrrrrrrrrrrrrr", does anyone know what could b ... Ljay43 Sun, 02 Apr 2023 13:03:05 -0700 https://electro-music.com/forum/viewtopic.php?p=453339#453339 Whatever is causing it is most likely what you have the output connected to, could be an amplifier as Jan mentioned.
Computers can also be a likely culprit. I have a similar problem here since I hardly have any sockets with an earth connection (only ... PHOBoS Wed, 15 Feb 2023 08:45:40 -0700 https://electro-music.com/forum/viewtopic.php?p=453018#453018 Ah, that’s significant info…. You need to check the internal power supply and distribution. Besides a main input fuse (I’m assuming this runs off a 12vdc wall wart power supply), there may be more. There could be a 5v supply, etc. So you nee ... DES Sun, 18 Dec 2022 10:20:32 -0700 https://electro-music.com/forum/viewtopic.php?p=450374#450374 Got an old soundcraft spirit folio racpac. In terms of specs it's exactly what I wanted so I took a risk on an untested unit.
When it arrived I plugged it in, it powered up, and all the channels and sends seemed to be working, Awesome!
But then... m ... kapachuchu Mon, 18 Oct 2021 10:39:06 -0700 https://electro-music.com/forum/viewtopic.php?p=450331#450331 I have been doing more fab and repair work with SMD.

This is done by hand, with a soldering iron and hot air gun. No robotics etc., this is DIY

It's going O but I need a practical means to stage SMD parts while I'm building.

I see some use ... cslammy Wed, 13 Oct 2021 10:54:47 -0700 https://electro-music.com/forum/viewtopic.php?p=450330#450330
I do still have 1 question though. The input signal seems to need to be quite high, if it's quiet then it seems to act like a noise gate and just cuts off.. is that normal ??

Davey: I don't know about LMNC's MS20, but I have built a couple of ... cslammy Wed, 13 Oct 2021 10:47:28 -0700 https://electro-music.com/forum/viewtopic.php?p=450309#450309 Hi,

first you need to check that the power supply is working. Here https://www.synthxl.com/roland-jv-1080/ you can download the service notes with the schematic. The power supply is on page 17. Check the output of the transformer (connector CN401 ... lilpaula87 Sun, 10 Oct 2021 12:37:22 -0700