Roland JUNO-D Repair and Teardown
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- Опубліковано 20 лют 2018
- Repair of a really sad Roland JUNO-D Synth. Someone had attempted to work on this before and just made things worse. Bad key contact repair had to be fixed, a ribbon cable was ripped out, and a broken volume potentiometer.
I demonstrate how to replace bad carbon key contacts with parts from a remote control. Also a quick teardown off its internal architecture. - Наука та технологія
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!
This was very good, thank you. And I really appreciated the tips regarding the carbon pads.
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.
Really amazing and skillfull repair well done.
Congratulations on the repair and very good video, keep them up!
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).
Wow! What a great video. Keep up the good work!
Man that ribbon cable sucks. Thanks for showing that it could be fixed!
Bonus La Mer! Great instruction!
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?
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?
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!
Do you have the volume module's part number?
Good day! Would you know what happened to my juno d making cracking sounds? Thank you.
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
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
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?
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!
oh, forgot: thanks so much for this video!!!!
Sir good day , can i buy the power module of that keyboard plsss or else where to buy??
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?
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?
How much of it applies to the Juno D LE?
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
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
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! Could you find a solution for this? Have a similar issue
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.
Just an update.
The Distortion was caused by a faulty PSU (walwart) The Keyboard came with an aftermarket supply (which suggests the original was either lost or dead)it wasn't supplying the correct voltage because the current was underrated.
Replacing with the correct supply fixed it
my roland juno d cursor buttons were not working, can they just be replaced with usual tack/momentary switch butttons like the black ones?
yep
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?
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.
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.)
Please my juno ds is not sounding clear is like the pitch is affecting the tons
HOLA TENGO EL MISMO TECLADO PERO PRENDO Y QUEDA TILDADO EN ROLAND NOMAS QUE PUEDO HACER
hey guys! anyone to know where to download a service manual for the Juno D??? thanks so much!!!!
I found one for the RS-70 on Rolands website, there should be one for every old model. You could use the RS-70s documentation for the most part, too, it is almost the same machine. another guy here on youtube has 2 RS-70 vids explaining the differences. (sounds, functions)
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.
Roland pots break easily I just repair about 8 on a fantom.
Hi. Interesting. I have this issue. I will open this and try to fix with your method. By the way where can I find new one. Thank you for advice
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
Yes it can be updated but! You are gonna need to read the Manuel online
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 did end up replacing, the part number I believe is 688-RK14K1230A2X from Mouser, only costs about $1. Thanks for watching!
bradthx Thanks very much for your reply!! 🙏🏻 Now I’ll see if I can do it. 🛠
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 ^^
Juno Di ki display milegi
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.
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 UA-cam channel.
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
Do you mean the plier? I used a very sharp knife and it worked well... (penge vagy dekorkés)
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. 🙏🏻
Did you find a fix to this issue? My Juno D has the same issue along with a few dead keys and a non-working Value + button.
Elliott Dominguez Yes, I successfully fixed the problem!! Ordered a new pot and carefully followed the instructions on this video (and a couple others). It was a bit of a challenge for me being a novice when it comes to DIY repairs - but I succeeded and the part was less than 10 bucks. 👍
@@geraldhartley Thanks! I'll be in the same boat as a novice.
@@EMdominguez92 Good luck. As long as you have some rudimentary soldering skills, you should be able to fix yours too!! Good luck!!
nice...NIN - La Mer at the end
Can I purchase the rubber contacts? I have gold bottom contacts
www.syntaur.com
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?
hi there did you fix it? Are you PC user? Can you tell how you connected it to PC? and how exactly to do the update? Cheers
@@michmach8548 Hi, my Juno D is LE version. I corrected this using the update 1.05 www.roland.com/uk/support/by_product/juno-d/updates_drivers/ab2627d1-a339-4945-b29d-dd0ac9f1dfb4/ I use PCSMF and UM-ONE cable to transfer files.
@@araujoviniciusu1 Thanks! And how you applied update - has through which cable? Does the both cables do same thing? I have older Juno D, so perhaps I can't use PCSMF cable, just about to purchase um-one one. Cheers
@@michmach8548 PCSMF ia a Roland software to tranfer update files and UM-ONE is the cable. If your Juno D is not LE the update must be 1.04 www.roland.com/br/support/by_product/juno-d/updates_drivers/
@@araujoviniciusu1 ah I understand now! Thanks!!
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
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.
If you carefully control your environment with proper humidity, after 20+ years it's never been an issue.
🥰
This looks like an updated U-20, originally meant to be Juno 20 as the circuit board reads JU20 :)
Hey lo pudiste reparar ?
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?
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?
ua-cam.com/video/CymTZkW1J44/v-deo.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