Search found 617 matches

by Yekuku
Thu Mar 05, 2020 9:16 am
Forum: HELP!
Topic: Weak output from Roland RS101 string synth
Replies: 51
Views: 16816

Re: Weak output from Roland RS101 string synth

Hey thanks for solving this years old mystery and letting us know !
by Yekuku
Sun Feb 23, 2020 2:49 pm
Forum: HELP!
Topic: Anybody with a Roland SDE-2000 ?
Replies: 0
Views: 308

Anybody with a Roland SDE-2000 ?

Hi guys, I am having a hard time figuring out if my unit is in fault or not. Everything seems to work , but I have doubts about the UNIGAIN +4dbm / -20dbm switch operation. When setting to +4dbm the output is louder, compared to the -20dbm setting, but the input signal led indicator is lower. When s...
by Yekuku
Thu Feb 20, 2020 9:08 am
Forum: HELP!
Topic: Line noise in Kurzweil K2000
Replies: 2
Views: 668

Re: Line noise in Kurzweil K2000

Concerning the hum issue , sounds like a problem with the filter caps in the power supply.
About the static noise, it should be the infamous output JFETS dying.
by Yekuku
Fri Feb 14, 2020 9:31 am
Forum: HELP!
Topic: KORG M1 - No sound / Low battery indication. SOLVED!
Replies: 48
Views: 31661

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

Obviously the problem is located in the power supply.
The fact that you are getting 10Volts instead of 5V is bad news, digital components dont like overvoltage.
Good luck, let us know how it goes.
by Yekuku
Mon Feb 10, 2020 7:26 pm
Forum: General Synthesizers
Topic: Digisound 80 Capacitor Voltage ratings
Replies: 1
Views: 411

Re: Digisound 80 Capacitor Voltage ratings

I dont recommend 16V, 25Volt should work ok , 35V is recommended just to be on the safe side.
by Yekuku
Mon Feb 10, 2020 6:32 pm
Forum: HELP!
Topic: KORG M1 - No sound / Low battery indication. SOLVED!
Replies: 48
Views: 31661

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

Hi, I have the inconvenience of battery low (internal). According to what I read, I initially changed the C23 for a new one, and everything remained the same. Then I changed the rest (c11,19,18,21 ... etc) and it keeps telling me the same error. Any idea what the fault may be? I inherited the keybo...
by Yekuku
Wed Feb 05, 2020 9:34 am
Forum: HELP!
Topic: KORG M1 - No sound / Low battery indication. SOLVED!
Replies: 48
Views: 31661

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

Great news! Enjoy your M1 🙂
by Yekuku
Mon Feb 03, 2020 11:32 am
Forum: HELP!
Topic: Roland D50 operates very slowly
Replies: 3
Views: 822

Re: Roland D50 operates very slowly

I have heard that if you reverse the pins of a problematic crystal oscillator , it might start working again.
Since you are waiting for an oscilloscope to arrive, you can try this on the 2nd crystal and see if sth changes.
by Yekuku
Sun Feb 02, 2020 1:32 pm
Forum: HELP!
Topic: Roland D50 operates very slowly
Replies: 3
Views: 822

Re: Roland D50 operates very slowly

hi and welcome on the board.
if memory serves me right there are 2 crystals on the d50 mainboard.
Can you measure their frequency?
Relativelly new cheap multimeters can read frequencies up to 50 MHz
by Yekuku
Sun Feb 02, 2020 1:13 pm
Forum: HELP!
Topic: KORG M1 - No sound / Low battery indication. SOLVED!
Replies: 48
Views: 31661

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

Hi Mirzaa,
Since you are getting correct voltages on the +/- 12 voltage rails, the problem should be on the DAC card.
Check R79 in the DAC board (KLM-1261), it should be 10 Ohms.
by Yekuku
Tue Jan 28, 2020 11:24 pm
Forum: General Synthesizers
Topic: How can I produce this Minimoog special sound effect?
Replies: 11
Views: 1424

Re: How can I produce this Minimoog special sound effect?

The minimoog part plays at 1:10, the sound that you are talking about is definitely an overdriven guitar sound through a slow flanger.
by Yekuku
Sun Jan 19, 2020 9:32 am
Forum: HELP!
Topic: KORG M1 - No sound / Low battery indication. SOLVED!
Replies: 48
Views: 31661

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

Hi flyingsaucer,
these are tantalum caps 10uf at 35 V. I did a quick check on the schematics, but i could not find any 10uf cap to replace.
by Yekuku
Sat Jan 18, 2020 11:08 am
Forum: HELP!
Topic: KORG M1 - No sound / Low battery indication. SOLVED!
Replies: 48
Views: 31661

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

well that was fast ! great work man :)
by Yekuku
Wed Jan 15, 2020 4:49 pm
Forum: HELP!
Topic: KORG M1 - No sound / Low battery indication. SOLVED!
Replies: 48
Views: 31661

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

Hi flyingsaucer and thank you for your kind words. Just use a sharp cutter and cut the epoxy glue perimetrically at the base of the caps. You should be able to desolder the caps without problems. there is no reason to remove the remaining epoxy glue from pcb unless the epoxy is in contact with other...
by Yekuku
Wed Jan 15, 2020 4:15 pm
Forum: General Synthesizers
Topic: Questions about midi gate out and SUM
Replies: 1
Views: 400

Re: Questions about midi gate out and SUM

Hi I havent used a neutron but i have some experience in modular synths, so i hope this helps a bit. Gate signal is send from the keyboard to the VCA (or envelope) and that controls the duration of the note that is held. Midi gate is probably active when a midi keyboard is connected to the midi in p...