Oh man, you just made my day. I have one of this keyboard and it needs a little repair at the Value + button. I want to thank you for this masterclass! Thanks from Brazil!

The Juno D service manual has a schematic showing all the missing components (USB interface, floppy drive controller). They are marked NIU (not in unit) on the schematic - so they are not found on the Juno D board. Likely used in a different synth from the RS-30 line. The Juno D Limited Edition added a 2nd sample ROM chip near the DSP sound generator chip.

I have just finished the complete (61x2) repair of my contact pads on the exactly same model (Juno-D). Now the keyboard is working unbelievably well. I have bought a TV-remote repair set in a TV repair shop. The cost was about 4 euros and I spent 4-5 hours doing it (plus the 24-hour time waiting for the glue).

Lol easy to take apart? You ain't kidding I just bought one of these off eBay with a distorted output. I decided to take it apart last night but l already had another project on my bench so I took it apart on my lap instead. A quick look at the board and the service manual reveals a few 4559 op amps after the DAC maybe this weekend I'll clear the bench and try to get my meter and a scope on it and try to work out what going on. Hopefully the fault won't be in one of the proprietary Roland ICs. as for repairing the rubber key contacts you can buy bags of carbonized pads to glue on. I did however once upon a time find a chap from the USA ( I'm from the UK) who was selling carbonized conductive stickers that were waffer thin and stuck over the old contact. They actually worked really well and I managed to save 3 keyboards that the replacement pads weren't available for. The two keyboards that I still know about are still working over 10 years on.

Really amazing and skillfull repair well done.

I noticed that a lot of these Japanese keyboards -- Roland, Yamaha, Korg, Hammond-Suzuki all use these same rubber strips.... I believe they are created by FATAR. So I think that the strips are relatively interchangeable, at least on those who are full octaves. Have you noticed the same? The only differences I have found is on 61 & 73 keyboards having shorter versions due to the cut off's of an octave... Your thoughts??? The reason I'm trying to find this out is because, for example, if you have to purchase a new one from Hammond - they want an arm and a leg! If you purchase one from Roland or Yamaha, they are generally more reasonable.

Do you have the volume module's part number?

This was very good, thank you. And I really appreciated the tips regarding the carbon pads.

Ive got an issue with mine,no sound from the main outs.. The headphone jack works but its low and if I press the keys hard I get distortion, the distortion goes away if I turn down the main volume knob but then I can hardly hear the synth at all..

I have a Roland Juno-D with a couple of dead keys that need cleaning. The modulation stick also doesn't work as intended. Physically it is fine, but it doesn't affect the sound the way it's supposed to, almost like it's disabled. Anyone else have this issue and a resolution? Thanks! UPDATE 4/4/22: Modulation stick wire wasn't properly connected by previous tech -- solution was straightforward, just reconnected the wire from the main board to the modulation stick (there's a clip). Also, fixed my dead keys by following this video. Just needed a good cleaning with 99% iso alcohol. Next up: repairing the tact switches on some buttons (Value +/-, etc.)

Typical roland volume pots. You can recrimp the can, and it will fix it. Not the best, but works. Every darn roland item I have used, the same style pot is broken. All the same reason, the shaft pushed hard, and bends the can tabs that hold it together.

Nice video. My Juno D problem is a high pitch noise I get when the volume knob is turned between 1/4 and 3/4 up, when connected to my digital piano. Also, there is a pulsating hiss noise. Anyone else have this problem? Is it repairable?

This is a great video, thanks for posting. I tried cleaning the lowest octave to test the fix and only 1 key started working. For me, every key is dead but some play sporadically and very quiet. Any ideas if the cleaning doesn't fix it? Or do I just need to do a more thorough cleaning?

I have one where the volume knob seems to be loose on the inside. Like the whole knob wiggles, and the connection is a bit loose on the output when using the volume knob. Everything else works. Would it be hard to fix myself? I have a little bit of experience with soldering and opsending stuff, but haven’t opened a synth before. Best

Man that ribbon cable sucks. Thanks for showing that it could be fixed!

I replaced the rubber pads on our d after 5 years. Early ones had an issue and cleaning them doesnt last, as i found out after dissasembly and cleaning twice. Just buy a new contact pad strip

How do you replace the lcd, i made a stupid mistake of cleaning it with alcohol now it doesnt disolay anything, parts are hard to find too

Sir good day , can i buy the power module of that keyboard plsss or else where to buy??

At 18:50 you are wiggling what appears to be a broken volume pot. Did you actually replace it? My Juno D has the exact same problem. At first it was loose - but still worked... now it’s DOA. Any tips or advice on replacement of that part?? Thanks in advance. 🙏🏻

nice...NIN - La Mer at the end

Hello. Sorry, i know it’s out topic but i really need a help with my Korg M50 that have sound crackling, low volume and keep restarting after some minutes. How can i get touch with you ? Thank you and great video with explanation.

thanks for your brilliant video of the innards of the Juno D, am going to get replacement rubber contacts for mine, do you know if there's any way of knowing whether the contacts are the newer carbon ones or the earlier gold ones before opening it up? your one has carbon contacts, is that correct?

Congratulations on the repair and very good video, keep them up!

Greetings, I speak from Brazil. Could you tell me the code (value so I can buy another one and replace) of the "D2" diode on the Power supply board. My diode is shorted. I'm going to buy another one and replace it, maybe my board will come back to life. My diode says U46, at least that's what I think it says. Thank you in advance and congratulations on your KZfaq channel.

How much of it applies to the Juno D LE?

I have this synth and the problem is that the sound selection buttons do not work. They keys are fine however. Is it even worth the $$$ getting it fixed?

Amigo, Necesito ayuda. Se me rompió la placa dónde se conecta la fuente de electricidad. Tiene arreglo? O se podrá reparar? Paso el número de placa creo es RS-30 PWB Main Assy. Es para un Teclado Roland JunoD

Please my juno ds is not sounding clear is like the pitch is affecting the tons

my roland juno d cursor buttons were not working, can they just be replaced with usual tack/momentary switch butttons like the black ones?

Good day! Would you know what happened to my juno d making cracking sounds? Thank you.

New subscriber here, can you diagnose my Roland Juno D if what is the problem? Can turn on but the LCD is blank no words comes out in the LCD, and it has no sound also. Can you help me what parts need to change this?

It’s a well made repair video with good narration. But I have a pet hate with repairers needlessly touching bare metal contacts while not earthed.

HOLA TENGO EL MISMO TECLADO PERO PRENDO Y QUEDA TILDADO EN ROLAND NOMAS QUE PUEDO HACER

When replacing the volume POT, is it ok if when soldering, all of the 6 pins( i believe its 6 ) touch with a bit of melted solder?

Hello Sir, I have a problem with a Juno - D identical as shown in your video. I have a blank screen..no sound...power supply is OK (12 V and 5 V OK). Can you help me? I will appreciate so much. BR - GM

Got any idea why juno d got this blasted sounds? They say its the pre amp issue. But i want to know the real problen. Thanks!

hey guys! anyone to know where to download a service manual for the Juno D??? thanks so much!!!!

Wow! What a great video. Keep up the good work!

Hi, do you happen to know what causes a key to be wiggly? Like its a bit loose and has a little play from side to side(G - 4th octave), all the rest feels fine and stiff, havent opened it though, thanks!

Bonus La Mer! Great instruction!

the chip slot on the juno D might be the place for the song player feature on the juno di. never seen a brand like roland (rs50, juno series) I guess they're stoned while inventing new models ^^

Hi! Thanks for the video, you helped me to repair my synthesizer , but i have a question: What is the name of the tool used to replace the rubber contact? Thanks: Roland

oh, forgot: thanks so much for this video!!!!

This looks like an updated U-20, originally meant to be Juno 20 as the circuit board reads JU20 :)

Hi bradthx, i have a Juno D LE and i want to ask something. When i start the synth, the first 10 seconds the output sounds "crackie", then go normal. I think that the problem is a low capacitor, but when i saw the main board...that has a lot of electrolytic components. Do you know what the audio ones are? (maybe the problem is similar to the XP-50) Thanks!

Hi there I have different question regarding this exact Synth. Can you please tell if you perhaps updated it through PC or mac and know how to do it and what it does and if you would recommend it? Cheers

I left a comment last year about the bad volume pot you speak of at 18:50. Did you successfully replace it?? I have the same issue but mine is totally DEAD now. Any direction on how to replace that would be gratefully appreciated!!

I have the same issue and Thanks for the info. My Juno D also has distorted output on all patches and even on the phones. I changed the output op-amp and I even replaced the DAC. would you have any ideas? ANYONE?

Can I purchase the rubber contacts? I have gold bottom contacts

Juno Di ki display milegi

🥰

Hi! I have a problem with Juno D. After tried to update the system to 1.04 version my synth doesn't work anymore. I press the power button and the screen is empty, nothing symbols, only orange light. How can I solve this problem?

Juno Di सर इसस्क्रीन पर बैटरी लो बता रहा है सर मुझको कीबोर्ड सुधरवाना है सर आप कहां से है हो सके तो नंबर दीजिएगा मैं बात करना चाहता हूं आपके पास आना चाहता हूं

Plz reply sir

Even I switch my JUNO D Limited on, the display is blank. Any idea to fix it? kzfaq.info/get/bejne/ed-dh72cvJeuZGg.html

Man to vajag

no one answers here, dont waist your time.

Rubbish built quality for the money, all in all not too good this synth