[sdiy] Fwd: SL880 Pro problems

[Mike Kelly]

For info.

> Begin forwarded message:
> 
> From: Michael Kelly <mike at downlode.uk.net>
> Subject: Re: [sdiy] SL880 Pro problems
> Date: 7 November 2021 at 11:25:12 GMT
> To: Roman <modular at go2.pl>
> 
> Hi Roman,
> 
> To answer your questions in turn:
> 
> 1. No
> 2. It plays all pressed keys but sometimes Note off is not sent. Also while the Note on messages seem to be sent correctly the pitch is very variable. The pitch sent over midi will vary when pressing the same key.
> 3. It’s as described above, just Note on messages, sometimes with no corresponding Note off. Timing of notes is not always correct. I.e. there is some lag at times.
> 
> If I unplug the volume control pedal, I get a constant flow of Volume channel midi messages. This is the problem I’ve had since getting the keyboard, so I think these new issues are separate. When there is a jack in the Volume socket there are no unwanted midi messages sent.
> 
> Pitch wheel also no longer has any effect.
> 
> Best wishes,
> Mike
> 
>> On 7 Nov 2021, at 06:13, Roman <modular at go2.pl <mailto:modular at go2.pl>> wrote:
>> 
>> Does it play any MIDI by irself untouched?
>> Does it play all pressed keys or randomly swallows some of them?
>> Can you post MIDI-OX log or screenshot showing this behavior?
>> 
>> My guess is intermittent connection of jacks board cable, or jacks cracked soldering.
>> 
>> Roman
>> 
>> 
>> ---- Użytkownik Mike Kelly napisał ----
>> 
>> Hi, I wondered if anyone has experience in troubleshooting Studiologic SL880 midi keyboards. I picked up this one second hand and really like the weighted action.
>> Since the off there has been a problem with some rogue midi output signals. Plugging a volume pedal into the volume socket seemed to solve it. Now however after a couple of years of use I am getting random and unstable outputs and it’s unusable. I tried changing a couple of the electrolytic caps as I had spares. The board generally looks OK and the settings functionality and the LEDs all seem to be working fine, so I think there’s not much wrong with it. If anyone knows a likely point of failure on these boards please give me a shout. 
>> 
>> I thought about replacing the crystal as it looks a bit aged. Marking is 24.0MHz, HCJ-30 02-02-57. Would any 24MHz crystal do? Or am I on the wrong track.
>> 
>> Alternatively if there’s a way to put a whole new DIY circuit in there I could go that route. They’re Fatar keys I believe, with aftertouch.
>> 
>> Thanks.
>> M
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