Search found 153 matches

by cutoffres
Mon Oct 06, 2014 3:45 pm
Forum: HELP!
Topic: Roland Juno 106 Bender innactive & portamento always "ON"
Replies: 9
Views: 2938

Roland Juno 106 Bender innactive & portamento always "ON"

Hi, the Juno 106 was fully repaired. At the moment to close the machine, by (stupid) inadvertence, i made a electrical short between pins of the JACK power plug on the Power supply board. :cry: The symptoms that are still there: none of the control on the bender panel works! The TUNE pot at the back...
by cutoffres
Fri Nov 29, 2013 4:19 pm
Forum: HELP!
Topic: Challenge on a Juno 106 LFO trig
Replies: 1
Views: 674

Challenge on a Juno 106 LFO trig

Hi, got a full working Juno 106, except when it is cold the LFO Trig on the bender don't works. After a few minutes when the synth is warming up, the LFO bender Trig begin to works gradually. Juno 106 service manual is here : http://manuals.fdiskc.com/flat/Roland%20Juno-106%20Service%20Manual.pdf At...
by cutoffres
Wed Oct 09, 2013 11:21 am
Forum: HELP!
Topic: Roland Tr-909 Strange issue
Replies: 1
Views: 580

Roland Tr-909 Strange issue

HI, i'm repairing a TR909. Evrything is now ok except : Even if the pattern is erased, There is always a LowTomand and a HIHat at the first step of pattern 1; pattern 3; pattern 5; pattern 7; pattern 9; pattern 11; pattern 13; pattern 15 (so every odd number) I've replaced eprom : no success -Maybe ...
by cutoffres
Mon Aug 05, 2013 5:53 pm
Forum: HELP!
Topic: Korg Polysix P11 line on Scope...[SOLVED]
Replies: 3
Views: 1062

Re: Korg Polysix P11 line on Scope...

Just find the solution:
ic5 socket on KLM371 was not well soldered.
Now it is fully working.

"become crazy" was : Always stuck on B2. And cpu always reset when using OCTAVE , EFFECT , ATTENUATOR.
Thanks Rhino.
by cutoffres
Mon Aug 05, 2013 5:07 pm
Forum: HELP!
Topic: Korg Polysix P11 line on Scope...[SOLVED]
Replies: 3
Views: 1062

Korg Polysix P11 line on Scope...[SOLVED]

Hi, originals symptoms : Polysix become crazy when using OCTAVE or SUB OSC or EFFECT or ATTENUATOR. After repairing original 367 Board without success. Then I have replaced the original 367 by a well built 367 Clone. Symptoms are the same... So it could be a problem external from KLM367 : i scoped t...
by cutoffres
Thu Jul 19, 2012 6:30 pm
Forum: HELP!
Topic: ROLAND TR-707 SEQUENCER NOT RUNNING
Replies: 5
Views: 1282

Re: ROLAND TR-707 SEQUENCER NOT RUNNING

problem solved,
D5 diode was dead.
by cutoffres
Thu Jul 19, 2012 5:38 pm
Forum: HELP!
Topic: ROLAND TR-707 SEQUENCER NOT RUNNING
Replies: 5
Views: 1282

Re: ROLAND TR-707 SEQUENCER NOT RUNNING

Thanks gcoudert, but the TR707 is set on the right mode : Internal Tempo clock.
by cutoffres
Thu Jul 19, 2012 4:18 pm
Forum: HELP!
Topic: ROLAND TR-707 SEQUENCER NOT RUNNING
Replies: 5
Views: 1282

Re: ROLAND TR-707 SEQUENCER NOT RUNNING

also replaced IC2 (4011) without success. :cry:

That is the first digital drum machine i try to repair.
I don't understand exactly what circuit area/component generate the clock that run the sequencer, could a tech explain me ?
Thank you
by cutoffres
Wed Jul 18, 2012 1:52 pm
Forum: HELP!
Topic: ROLAND TR-707 SEQUENCER NOT RUNNING
Replies: 5
Views: 1282

Re: ROLAND TR-707 SEQUENCER NOT RUNNING

On TEMPO CLOCK , TM1, IC3 (14584) and Q3 transistor have been replaced without success.
still continue investigations, but any help is welcome.
Thanks
by cutoffres
Tue Jul 10, 2012 6:53 pm
Forum: HELP!
Topic: ROLAND TR-707 SEQUENCER NOT RUNNING
Replies: 5
Views: 1282

ROLAND TR-707 SEQUENCER NOT RUNNING

Hi, I know how to use the TR707, so i'm sure this one is faulty : the sequencer is not running anymore : -The sequence do not start , and sometimes there is no more a TEMPO indicated on the Lcd screen -There is also troubles for choosing the SYNC mode ( SYNC MODE while holding SHIFT key). So there i...
by cutoffres
Tue Jan 17, 2012 4:01 pm
Forum: HELP!
Topic: Memorymoog No sound
Replies: 5
Views: 1086

Re: Memorymoog No sound

thanks, 0 TUNED means that the computer inside the Memorymoog could not tune any of the 6 voices. This explains why there is no sound. It is meant to be like this... ...You will need to take it to a tech. And a good one. i'v got scope, multimeter and some skills, and the memory is open under my eyes...
by cutoffres
Tue Jan 17, 2012 3:37 pm
Forum: HELP!
Topic: Polysix st
Replies: 19
Views: 2041

Re: Polysix st

Hello Mooger, thank you very much for all the help ! Unfortunately i've never been able to measure duty cycle on the Pin 24 of ARPEGGIO CPU. I've pass hours and hours without finding the issue, the only chance now will be to saw complete boards replacement, to find witch board is defective ? or give...
by cutoffres
Fri Jan 13, 2012 7:49 pm
Forum: HELP!
Topic: Memorymoog No sound
Replies: 5
Views: 1086

Memorymoog No sound

Hi,
there is no sound from my memorymoog and when AUTOTUNE it says "0 Voice tuned" :
-is it normal to get no sound from a voice when this voice is not tuned ?
-have you ever had the "0 voice tuned" ? And what did you do to repair and get all the voices back ?
Thanks a lot for the help
by cutoffres
Fri Sep 23, 2011 4:31 pm
Forum: HELP!
Topic: Polysix st
Replies: 19
Views: 2041

Re: Polysix st

Hi Mooger5, i'm back with my Polysix nightmare : Sorry cutoffres, I had another look at the schematic and now it seems the fault doesn´t lie in the timer circuit. You say the problem also happens when using an external clock, and in that situation the 555 circuit just gets out of the way, ACKR line ...
by cutoffres
Wed Sep 21, 2011 5:27 pm
Forum: HELP!
Topic: Polysix st
Replies: 19
Views: 2041

Re: Polysix st

Mooger5, Thanks a lot for the measures and all the explains, it helps me a LOT =D> About 8049 cpu assigner : I scoped that circuit and at pin 38 I read +5VDC when arp is OFF. When arp is ON I read 0V. Then, the moment I hit a key (to start an arpeggio) I read a short +5V pulse. -I scope the same mea...