Roland Juno-106 Synthesizer Troubleshooting/Repair Quiet Voice

Today I'm investigating an issue with a Roland Juno-106. Voice #4 is a lot quieter than the others. And it's not a calibration issue. 99% certain it is NOT the brand new voice chips I put in as seen in a previous video. Troubleshooting will confirm that statement. So what else could it be? Maybe something EVERY 106 owner will want to be pro-active about mitigating?

This video is posted for general information about my experiences. Always observe safety working on electronics, and never tinker around inside power supplies without first unplugging the power cord. De-soldering components on the Juno-106 must be done VERY CAUTIOUSLY to avoid lifting very tiny delicate traces. If you're not sure about anything, there's no shame in taking your instrument to a qualified service technician.

Timestamps
0:00 Intro + Symptoms
0:35 Voice Chip Swap Test
1:06 Looking at the Wave Chip output
1:56 Waveform Chip replacement
2:23 Testing
2:51 Voice Board inspection and Remedy
3:19 Re-testing, did it work?

Be sure to check out my cool eurorack modules in my Reverb Store :D

Sequential Drumtraks Drum Machine Repair

Today I'm investigating issues with a Sequential Drumtraks. While it is making sounds, the display is glitching out and the control functions are not working. In the end it was only incidental I was able to get it working again, for reasons I don't fully understand. The same phenomenon happens with my Drumulator, that's how I knew what to check for. It's my hope posting this video, that someone more knowledgable will be able to comment about this phenomenon.

This video is posted for general information about my experiences. Always observe safety working on electronics, and never tinker around inside power supplies without first unplugging the power cord. If you're not sure about anything, there's no shame in taking your instrument to a qualified service technician.

Since filming the video, I've discovered the batteries are still made in Japan. Also, the numbers on the battery may or may not necessarily be a date code. My new battery says 2132, so maybe it was made in 2021? Since the manufacture date and date installed may differ by a couple of years, I now write a date on the battery with a sharpie when I install it.

Timestamps
0:00 Intro + Symptoms
0:28 Power Supply investigation
2:10 Battery
2:28 Data Bus Check
4:08 About Cleaning IC pins
4:28 Last ditch effort and suddenly it's working???
5:38 Short demo

I design analog Eurorack modules, check my Reverb store for availability.

Can I Revive Kenwood DX-7030 DAT Machine Recorder?

Today I'm investigating issues with a Kenwood DX-7030 DAT Recorder.
The door opens and closes, but doesn't play the tape.
There's not a lot of mech service video content on this model.
And I have no service manual.
Can I get this thing working?

This is just a summary of about 10 hours of inspection, fiddling, proding, and poking.
Not including watching a load of DAT mech cleaning content.
Big shout out to 12voltvids
There you can see more detailed tips for cleaning DAT mechanisms.

Timestamps
0:00 Intro and Symptoms
0:37 Tape Mech Breakdown
2:25 Take-up Rollers
3:10 Switch cleaning
4:14 Results?

Be sure to check out my cool eurorack synthesizer modules in my Reverb store.