Repair Roland TB-303 Vintage Analog Synthesizer Reparatur
Repair Roland TB-303 Vintage Analog Synthesizer Reparatur Service
19. April 2020
Repair LinnDrum Vintage Drum Computer Reparatur Service
Repair LinnDrum Vintage Drum Computer Reparatur Service
3. Mai 2020
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Repair LinnDrum Vintage Drum Computer Reparatur Service

Repair LinnDrum Vintage Drum Computer Reparatur

Repair LinnDrum Vintage Drum Computer Reparatur

LinnDrum. This time the Snare Drum / Sidestick was not working and some, meanwhile common, boot issues. This LinnDrum has been modified to easily swap the sound eproms. With this modification it can happen to put in the eproms in the wrong direction. If that is the issue some instruments only play a short trigger click.
Repair LinnDrum Vintage Drum Computer Reparatur
I traced down the fault to a dead AM6070 digital to analog converter. I found a replacement on ebay and the instrument(s) came back to life.
Repair LinnDrum Vintage Drum Computer Reparatur
I found some leaky capacitors in the individual audio outputs that needed to be replaced. I used nichicon audio grade capacitors for the replacement.
Repair LinnDrum Vintage Drum Computer Reparatur
Then I noticed this audio jack and I swapped it with the click jack, which is not so heavily used like the stereo outputs. Both are still working.
Repair LinnDrum Vintage Drum Computer Reparatur
Overall I found weak or questionable solder joints, which I re-flowed. I also re-flowed and cleaned up all the molex, since there was battery corrosion spotted from a previous damage.
Repair LinnDrum Vintage Drum Computer Reparatur
All the slider potentiometer sounded and looked very dirty and scratchy, so I sugested to clean them professionally. Open, clean, close ... no contact spray used.
Repair LinnDrum Vintage Drum Computer Reparatur
Finally I modified the power safe circuit and used a modern reset IC. The old IC was heavily corroded and the original circuit isn't that great anyway.
There are lethal voltage exposed in electronic devices. Unless you know what you are doing, don’t try this. If you following along, you doing so at your own risk.
I’m documenting repairs for my reference and yours. I do synth restorations and repair with a specialty in vintage synthesizers, drum computer and other vintage gear, based in Düsseldorf, GER. Get in touch about your synth situation!