Aftertouch repair

The Yamaha SY99 is a synthesiser combining frequency modulation synthesis (branded as Advanced FM) and sample-based synthesis (branded as Advanced Wave Memory 2) and the direct successor to Yamaha's SY77/TG77

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Saul
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Re: Aftertouch repair

Unread post by Saul » Thu Nov 09, 2017 12:39 pm

Monte wrote:
Thu Nov 09, 2017 12:02 pm
This has been weird. why are there any poor contacts/solder joints in the first place?
Age I would imagine. Over time with all the heating, expanding, contracting solder joints can come under strain. Also component value changes and degrade...bit like us humans really. We start off new and firing on all cylinders and it's downhill from there :lol:

Generally speaking though Yamaha gear is built to last and it often does so things like this are an exception. Looking back at all the keyboards I have owned which is around 31 over the last 30 years I have only needed to open one for repair and that was a Roland D-50 that had a dodgy resistor. Took about an hour to fix including disassembly and reassembly. So I think that is pretty good going and shows the general reliability of keyboards from Yamaha, Roland, Korg, Emu, Ensoniq, Alesis etc.
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Miks
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Re: Aftertouch repair

Unread post by Miks » Thu Nov 09, 2017 12:52 pm

Those pcb's were soldered by a 'wave soldering process' - please see here:

https://en.wikipedia.org/wiki/Wave_soldering

This process leaves only a small amount of solder at the contacts/pins/wires. If you have components like jacks (Midi/Audio/Pedals etc.) which are connected directly to the pcb and heavily 'stressed' by extensive usage many of them tend to wiggle loose over the times - which causes a wide variety of issues. Here's an example:

viewtopic.php?f=123&t=8432

The key contacts of the keybed are also mechanically 'stressed' by their usage and due to the small amount of solder they (may) get loose - I've had this issue with my DX7II/D some time ago. Re-soldered ALL of the solder joints on the keybed pcb and all was good as new. (Y)

I also had some output jacks with the same issue - intermittend audio output on my DX as well as my Korg M1 - re-soldered - problem solved. AND it gives you a lot more of mechanical stability so you may not have this issue again in the future...
My (key related) gear (in alphabetical order):
Kawai: K1 II
Korg: M1 (up'd to EX, w/ 'Cool Blue'), M1REX (w/ 'Cool Blue'), Poly-800
Roland: D-50, D-110, D-550, PG-1000
Yamaha: AW1600, DX7IID (w/ 'Cool Blue'), EX5R, RM50, RX5, SY99 (w/ 'Cool Blue'), TG500, TX-802, YMM2
Sector101: SYEMB05 (5x), SYEMB06 (3x), EXFLM2 (1kit), MCD Sweet16 (1x), WaveBlade 8MB Card (1x) & 1x Programmer Unit for WaveBlade


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Monte
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Re: Aftertouch repair

Unread post by Monte » Thu Nov 09, 2017 1:14 pm

Thanks Saul and Miks,

Great explanation.
I see that.

I have some experience with soldering/desoldering with guitar electronics, never had enough confidence to do this on a PCB of a keyboard. but if it will happen to me I'll try a DIY. :)

btw, I can see in your sig an M1 and M1R. maybe you could tell me - I love this synth and I've been using it extensively over the past years in VST. Thinking of getting a real one for more tactile control you can say... question is, whether or not its possible to load external program/combi banks on a blank PCMCIA card? How about PCM data?

I would appreciate info if you have experience doing this.
((i))
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Miks
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Re: Aftertouch repair

Unread post by Miks » Thu Nov 09, 2017 1:57 pm

Monte wrote:
Thu Nov 09, 2017 1:14 pm
Question is, whether or not its possible to load external program/combi banks on a blank PCMCIA card? How about PCM data?
Hmmm - the M1/M1R uses a 256 kB S-RAM card (which is NO PCMCIA card!) to store Progs/Combis/Seq-Data (apart from the internal memory). Its (mostly) a Mitsubishi BeeCard (containing a coin-cell to keep the data stored). But you CANNOT save your data directly to the card(s) - if you transfer data to your M1/M1R (i.e. sysex files via MIDI) they're ALWAYS going to the synth's internal memory! So you have to save the internal memory first if you want to keep that content!

After the transfer you have to store the internal memory to the cartridge (which first has to be formatted (if not already done before) within the synth - during this process you have to decide wether you want to 'use' sequencer data or not). Then you may put your saved data back to the internal memory...

Those PCM cards can't be 'copied' yet - but a guy I know is working on a promising solution for that - we have to wait and see what solution will arise... :wink:
My (key related) gear (in alphabetical order):
Kawai: K1 II
Korg: M1 (up'd to EX, w/ 'Cool Blue'), M1REX (w/ 'Cool Blue'), Poly-800
Roland: D-50, D-110, D-550, PG-1000
Yamaha: AW1600, DX7IID (w/ 'Cool Blue'), EX5R, RM50, RX5, SY99 (w/ 'Cool Blue'), TG500, TX-802, YMM2
Sector101: SYEMB05 (5x), SYEMB06 (3x), EXFLM2 (1kit), MCD Sweet16 (1x), WaveBlade 8MB Card (1x) & 1x Programmer Unit for WaveBlade


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ilmenator
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Re: Aftertouch repair

Unread post by ilmenator » Mon Nov 27, 2017 5:00 pm

Monte wrote:
Thu Nov 09, 2017 1:14 pm
How about PCM data?
For the Korg M1 line of synths and the great Korg Wavestation there is a proof of concept already a number of years old that can clone PCM cards successfully: see
https://vimeo.com/27590820
I have just returned to this project, so expect something to come out next year...

Best, ilmenator
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