#synthrepair — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #synthrepair, aggregated by home.social.
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TX7 Repair Test in Ms Mad Lemon’s Amiga Music Setup
#Amiga #YamahaTX7 #MsMadLemon #SynthRepair #RetroComputing #FMsynthesis #MIDI #HomeStudio #DX7 #AmigaMusic
https://theoasisbbs.com/tx7-repair-test-in-ms-mad-lemons-amiga-music-setup/?fsp_sid=3857 -
TX7 Repair Test in Ms Mad Lemon’s Amiga Music Setup
#Amiga #YamahaTX7 #MsMadLemon #SynthRepair #RetroComputing #FMsynthesis #MIDI #HomeStudio #DX7 #AmigaMusic
https://theoasisbbs.com/tx7-repair-test-in-ms-mad-lemons-amiga-music-setup/?fsp_sid=3857 -
TX7 Repair Test in Ms Mad Lemon’s Amiga Music Setup
#Amiga #YamahaTX7 #MsMadLemon #SynthRepair #RetroComputing #FMsynthesis #MIDI #HomeStudio #DX7 #AmigaMusic
https://theoasisbbs.com/tx7-repair-test-in-ms-mad-lemons-amiga-music-setup/?fsp_sid=3857 -
TX7 Repair Test in Ms Mad Lemon’s Amiga Music Setup
#Amiga #YamahaTX7 #MsMadLemon #SynthRepair #RetroComputing #FMsynthesis #MIDI #HomeStudio #DX7 #AmigaMusic
https://theoasisbbs.com/tx7-repair-test-in-ms-mad-lemons-amiga-music-setup/?fsp_sid=3857 -
TX7 Repair Test in Ms Mad Lemon’s Amiga Music Setup
#Amiga #YamahaTX7 #MsMadLemon #SynthRepair #RetroComputing #FMsynthesis #MIDI #HomeStudio #DX7 #AmigaMusic
https://theoasisbbs.com/tx7-repair-test-in-ms-mad-lemons-amiga-music-setup/?fsp_sid=3857 -
I just released a demo of a #Moog #Rogue #synthesizer that I modded while giving it a full overhaul. Now the LFO speed can be switched with some overlap. Schematic included. Have fun.
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Trying to find where a deceased synth software enthusiast checked for hashed-against-your-serial-number keys before allowing use of the revised software.
So of course I now have an interactive m68k disassembler/labeler/exploration tool.
If only I could figure out the load address. It isn't zero.
Maintenance manual hardware diagrams at least give me ROM and device address ranges.
Now I need automatic basic block extraction.
#synthrepair #reverseengineering -
Trying to find where a deceased synth software enthusiast checked for hashed-against-your-serial-number keys before allowing use of the revised software.
So of course I now have an interactive m68k disassembler/labeler/exploration tool.
If only I could figure out the load address. It isn't zero.
Maintenance manual hardware diagrams at least give me ROM and device address ranges.
Now I need automatic basic block extraction.
#synthrepair #reverseengineering -
Now running a soak test on the reg board with no load
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Full re-cap of the power regulator board for the CS-10 after finding more leaky caps.
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I just fixed another #Roland #SH101. A lot of damage and since the oscillator (famous #CEM3340) was dead and needed replacement I ran into hi notes tuning issues once more. This time I addressed them by making a custom circuit with a dedicated hi end trimmer.
If you have the same issue, please drop me a note to see if there is demand for a small series production.
Read more about repairing various issues of this wonderful #synthesizer in my blog.
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I just fixed another #Roland #SH101. A lot of damage and since the oscillator (famous #CEM3340) was dead and needed replacement I ran into hi notes tuning issues once more. This time I addressed them by making a custom circuit with a dedicated hi end trimmer.
If you have the same issue, please drop me a note to see if there is demand for a small series production.
Read more about repairing various issues of this wonderful #synthesizer in my blog.
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I just fixed another #Roland #SH101. A lot of damage and since the oscillator (famous #CEM3340) was dead and needed replacement I ran into hi notes tuning issues once more. This time I addressed them by making a custom circuit with a dedicated hi end trimmer.
If you have the same issue, please drop me a note to see if there is demand for a small series production.
Read more about repairing various issues of this wonderful #synthesizer in my blog.
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I just fixed another #Roland #SH101. A lot of damage and since the oscillator (famous #CEM3340) was dead and needed replacement I ran into hi notes tuning issues once more. This time I addressed them by making a custom circuit with a dedicated hi end trimmer.
If you have the same issue, please drop me a note to see if there is demand for a small series production.
Read more about repairing various issues of this wonderful #synthesizer in my blog.
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Solina String Ensemble MkII issue tracking. A lot of work on top of the usual recapping because of the Bass Circuit board being populated with a blend of MkII and MkIII resistor values. A total mess and I guess the bass section stopped working in 1993 when the net voltage was raised from 220 to 230V. The #Solina #Strings have an unregulated PSU so the main point is to get voltages to spec or certain transistors will fail.
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Solina String Ensemble MkII issue tracking. A lot of work on top of the usual recapping because of the Bass Circuit board being populated with a blend of MkII and MkIII resistor values. A total mess and I guess the bass section stopped working in 1993 when the net voltage was raised from 220 to 230V. The #Solina #Strings have an unregulated PSU so the main point is to get voltages to spec or certain transistors will fail.
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Solina String Ensemble MkII issue tracking. A lot of work on top of the usual recapping because of the Bass Circuit board being populated with a blend of MkII and MkIII resistor values. A total mess and I guess the bass section stopped working in 1993 when the net voltage was raised from 220 to 230V. The #Solina #Strings have an unregulated PSU so the main point is to get voltages to spec or certain transistors will fail.
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Solina String Ensemble MkII issue tracking. A lot of work on top of the usual recapping because of the Bass Circuit board being populated with a blend of MkII and MkIII resistor values. A total mess and I guess the bass section stopped working in 1993 when the net voltage was raised from 220 to 230V. The #Solina #Strings have an unregulated PSU so the main point is to get voltages to spec or certain transistors will fail.
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Solina String Ensemble MkII issue tracking. A lot of work on top of the usual recapping because of the Bass Circuit board being populated with a blend of MkII and MkIII resistor values. A total mess and I guess the bass section stopped working in 1993 when the net voltage was raised from 220 to 230V. The #Solina #Strings have an unregulated PSU so the main point is to get voltages to spec or certain transistors will fail.
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Last year I needed to repair the backlight of the display of my Roland D-550. I've chosen to replace it with an OLED.
Now I've created a short video with footage and pictures taken during my repair. More information to be found in the description of the video on Peertube. -
Last year I needed to repair the backlight of the display of my Roland D-550. I've chosen to replace it with an OLED.
Now I've created a short video with footage and pictures taken during my repair. More information to be found in the description of the video on Peertube. -
@flpvsk This sounds great! Thank you for spreading this initiative. I've started to progressively increase my skills in soldering and repairing my synths/fx gear.
Maybe I'm going to come along at a later date. Currently I don't have enough time to dive into a new maintenance project. -
„Guck, in der Chipstüte sind nur noch Krümel.“
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Incidentally, this synth is *absolutely* not worth the effort.
But I have learned a ton about Z80 operation, serial register chains, discrete logic, ROM and RAM operation, and my scoping equipment. So even if the synth never comes back to life, I've sure learned enough to build useful mid-80's electronics!
#synthrepair #electronics #retrocomputing -
Incidentally, this synth is *absolutely* not worth the effort.
But I have learned a ton about Z80 operation, serial register chains, discrete logic, ROM and RAM operation, and my scoping equipment. So even if the synth never comes back to life, I've sure learned enough to build useful mid-80's electronics!
#synthrepair #electronics #retrocomputing -
The data lines only run to, oh, *every* device on the board, so finding the offending party will be difficult.
It's probably a bad capacitor next to one of them? Making a list to desolder and replace.
#synthrepair #electronics -
The data lines only run to, oh, *every* device on the board, so finding the offending party will be difficult.
It's probably a bad capacitor next to one of them? Making a list to desolder and replace.
#synthrepair #electronics -
This fool synth (psn-70) has been on the bench much longer than it should be. It's going to have to give up its space shortly, and probably won't be running.
And today I finally thought I'd scope the data lines *analog* instead of digital, and I find that all the ROMs and RAMs are responding, but not managing to raise the signal levels high enough - they choke out around 1V.
Is something shorting them to GND?
#synthrepair -
This fool synth (psn-70) has been on the bench much longer than it should be. It's going to have to give up its space shortly, and probably won't be running.
And today I finally thought I'd scope the data lines *analog* instead of digital, and I find that all the ROMs and RAMs are responding, but not managing to raise the signal levels high enough - they choke out around 1V.
Is something shorting them to GND?
#synthrepair -
Wired up, scope on the address lines, looking good. But the ~CS signal is never de-asserted. I swear I checked that one. At least it's easy to trace.
But that will mean putting my mitts back inside the case.
I kind of wish I'd put an interposer arround the Z80 as well. I can probably piggy-back a socket on top of it and drop in another 28 pin wire?
Or should I go the full de-solder and socket route?
It's not like its a *valuable* synth.
#synthrepair #electronics -
Wired up, scope on the address lines, looking good. But the ~CS signal is never de-asserted. I swear I checked that one. At least it's easy to trace.
But that will mean putting my mitts back inside the case.
I kind of wish I'd put an interposer arround the Z80 as well. I can probably piggy-back a socket on top of it and drop in another 28 pin wire?
Or should I go the full de-solder and socket route?
It's not like its a *valuable* synth.
#synthrepair #electronics -
Nice tidy desoldering job. Now I no longer need my mitts in the case!
#electronics #synthrepair -
Nice tidy desoldering job. Now I no longer need my mitts in the case!
#electronics #synthrepair -
Saved from a Berlin trash container: Korg 900PS #synthesizer with missing top plate, from 1975. Functional basically, still a lot of issues need to be resolved. But this one will add some nice tone to the studio, literally, since 900PS translates to 900 horse power in German.