Search found 651 matches

by Yekuku
Thu Sep 24, 2020 11:10 am
Forum: HELP!
Topic: Dead AKAI S1100 repair
Replies: 6
Views: 2153

Re: Dead AKAI S1100 repair

I literally burned my mind with this , so I decided to take a few months off before attempting to repair it again.
Dont throw the towel yet , I can help.
If you ever give up and decide to sell it for parts, please let me know because I am looking for some parts .
thanks
by Yekuku
Thu Sep 24, 2020 8:41 am
Forum: HELP!
Topic: Dead AKAI S1100 repair
Replies: 6
Views: 2153

Re: Dead AKAI S1100 repair

Hi buddy, you can find everything here . this one has been the most difficult repair I have ever worked on. If you are lucky it is just the spsu. In my case , I have removed all logic ICs, I have found 1 dead , replaced it but it is still not working. My thoughts are on the RAM and CPU but i havent ...
by Yekuku
Thu Sep 17, 2020 12:48 pm
Forum: HELP!
Topic: Roland SH-09 Troubleshoot
Replies: 0
Views: 710

Roland SH-09 Troubleshoot

Hi VSErs :) I have a problem with a SH-09, when amp release is used , during the release stage the pitch drops. The synth works ok for 1 minute when it is cold, but after that period the problem appears. Also , when the synth is controlled by external CV, it is working ok. All these symptoms made me...
by Yekuku
Mon Aug 24, 2020 7:03 pm
Forum: HELP!
Topic: KORG M1 - No sound / Low battery indication. SOLVED!
Replies: 51
Views: 39734

Re: KORG M1 - No sound / Low battery indication. SOLVED!

Hi ,
The problem could be the psu but there is a chance that a component on the mainboard is failing short dragging the positive analog power line down.
My bet is that the filtering cap at the end of the psu 12v line needs replacing.
Sorry i am on vacation and i dont have access to schematics
by Yekuku
Wed Jul 15, 2020 9:33 am
Forum: General Synthesizers
Topic: poorly MKS70 - not sure what's up with it, MIDI fault?
Replies: 7
Views: 2233

Re: poorly MKS70 - not sure what's up with it, MIDI fault?

You should be proud of your Dad, thanks for letting us know :)
Obviously, the problematic chip was a 4051 analog switch that was routing signals from the CPU to the voices circuit.
by Yekuku
Mon Jul 13, 2020 6:45 pm
Forum: HELP!
Topic: Pitch shift DX7
Replies: 1
Views: 894

Re: Pitch shift DX7

Hi,
clean the potentiometer inside the pitch wheel assembly with a contacts cleaner or replace the potentiometer.
Also check the spring, the wheel might not center properly.
by Yekuku
Tue Jul 07, 2020 10:19 pm
Forum: HELP!
Topic: Roland U20 MIDI not working
Replies: 5
Views: 1893

Re: Roland U20 MIDI not working

eirianwhopkins wrote:
Tue Jul 07, 2020 4:00 pm
Recently bought a Roland U20 in need of some TLC. Fixed keys...
When you fixed the keys , could it be that you disconnected accidentally the ribbon extension on the left side?
This connection is not meant to be disconnected, it is held by conductive adhesive tape that is not reusable.
by Yekuku
Thu Jul 02, 2020 9:12 pm
Forum: HELP!
Topic: DX Mk1 - dead battery or something else?
Replies: 2
Views: 1015

Re: DX Mk1 - dead battery or something else?

Hi, it looks like memory corruption.
if restoring to factory defaults does not help, check the power supply.
Also check for battery leakage as this could affect backup memory operation.
I have seen ram chips go bad on the mkI, causing similar issues.
by Yekuku
Thu Jul 02, 2020 8:29 pm
Forum: HELP!
Topic: Roland D-50 with two dead keys
Replies: 5
Views: 1711

Re: Roland D-50 with two dead keys

Hi , what you are experiencing is a common issue for the D50. The problem is that the rubber contact strips that are under the keys , are either dirty, worn, torn or misaligned. https://www.synth-parts.com/media/image/f1/88/30/Contactrubber_Kawai_RH88Ag4Cf1ikGwcP7U.webp In most cases they are just d...
by Yekuku
Mon Jun 22, 2020 2:22 pm
Forum: HELP!
Topic: KORG M1 Will not power up after Battery Replacement
Replies: 6
Views: 3180

Re: KORG M1 Will not power up after Battery Replacement

Sorry there is no way, you have to either use a factory card or send the factory sysex via midi
by Yekuku
Sat Jun 20, 2020 5:04 pm
Forum: HELP!
Topic: Please help Urgently! Korg M1 noise level
Replies: 3
Views: 1678

Re: Please help Urgently! Korg M1 noise level

Hi and welcome to the forum.
The noise that you are describing could be a common issue for the M1.
A capacitor in the power supply and a resistor on the DAC board could be the culprit.
check this thread:
http://forum.vintagesynth.com/viewtopic.php?t=53799
by Yekuku
Thu Jun 18, 2020 4:17 pm
Forum: Samplers
Topic: E-mu e6400 classic has effects?
Replies: 2
Views: 1518

Re: E-mu e6400 classic has effects?

Hi and welcome to the forum. The RFX32 card was optional and it was introduced with the ultra series. It needs at least EOS 4.5 to operate. For more info here is the cards manual: http://www.deepsonic.ch/deep/docs_manuals/e-mu_eos_6864_rfxcardinstall-c.pdf The differences are in the eos versions , t...
by Yekuku
Wed Jun 17, 2020 11:38 am
Forum: HELP!
Topic: Korg M1R shows 'internal battery low" after replacing battery
Replies: 2
Views: 1189

Re: Korg M1R shows 'internal battery low" after replacing battery

Did you try a factory reset ? Hold Int, Combi and Prog while turning it on.
Warning! all patches / settings will be lost .
by Yekuku
Fri Jun 05, 2020 8:02 pm
Forum: HELP!
Topic: Drumtraks Noisy Transformer
Replies: 9
Views: 1563

Re: Drumtraks Noisy Transformer

Wow, thanks! Was your thinkning that the switch mode would not need hole to be drilled? Unfortunately , both solutions will need some hole drilling, it is just that the SMPS is easier to find than the custom transformer. Assuming that you live in the US , you can have a look for the custom transfor...
by Yekuku
Fri Jun 05, 2020 9:59 am
Forum: HELP!
Topic: Drumtraks Noisy Transformer
Replies: 9
Views: 1563

Re: Drumtraks Noisy Transformer

Hi , I have never seen a drumtraks in real life, but the transformer you are looking for has dual center-tapped secondary windings that output 2 x 18 VAC and 2 x 9 VAC, and it should be rated at 75 watts or more. Chances for finding the same transformer are slim , you can order a custom one with thi...