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If you just purchased a $800 digital piano from Donner and it arrived with bad keys like in this video, your first action should be to contact Donner and ask what your options are. I would NOT take the piano apart until you do that first.

Thank you Vincent. Did you experience the same bounce problem on the black keys? It definitely made an improvement on my keyboard, especially when I hit a black key in the center or towards the back of the key. I never hear anything from Donner. Hopefully their engineers see my videos.

Hello George! I'm strongly planning to buy myself one ddp soon, so your videos are great help to know what to do if I notice the same problem, your repairing is smart and affordable and it seems to be really efficient. I also hope that Donner's engineering dept they will watch your videos and take davantage of your job, so they can fix for good problem of bouncing around keys, and also improve the shipping packaging. Very good job! Thanks again for sharing.@@georgeterbush2976

I don't know what is worth less. My video or your comment.

Nice job! You never know what is going to walk in the door at those Repair Cafe events. Good thing you brought a selections of caps with you.

Hi Mr Lowery. Sorry I can not be much help on the power switch. My piano is back together and I'm not sure how the power switch assembly would be removed. So you are saying the button no longer clicks when you press it down? I wonder if you tap hard on it multiple times to see if it releases? Maybe a crumb of a cookie or something like that fell into the circle opening.

I looked at both the capacitance reading and the internal resistance. I don't believe any of the caps were bad and needed replacing on mine. What kind of problems does your CAT have?

​@@georgeterbush2976 It's probably my lack of knowledge about measuring these. I noticed you measured more capacitance then was mentioned on the cap. I thought caps only degraded but yours gone up in capacitance? I was wondering if that was a sign too for degrading...

@@OKB53 I was measuring in circuit so it's possible there is a little added capacitance from the circuit. Also, the caps are probably +- 20% tolerance. I would not worry about your caps if they read like mine. Internal resistance, on the other hand is VERY important. If they read 1 or 2 ohms, they would be bad (for 470uf caps).

​@@georgeterbush2976 Thanks, good to know! I just purchased mine and was in a pretty bad shape visually. I cleaned everything and now it looks very good. I didnt turn it on however. Thats my next step. I want to check the pu first.

@@OKB53 Wow! That's awesome. Good luck with the restoration. It's a piece of history.

Hi Deb. I think BOSE use to charge $100 for them to do the repair. They would swap out the bad circuit board with a new one. I'm not sure if they still offer this service since the player is so old. It sounds like you definitely have some bad capacitors that need replacing.

@@georgeterbush2976 thank you for your response. I'll check with Bose.

I think it is a common problem for at least the DDP-200. I would like to know if Donner uses the same design in their other keyboards. Thanks for you compliment. I'm just a piano hack but still enjoy playing. That's all that matters. :)

This video was to simply show what the charger's display panel shows in pulse repair mode.

If the unit is plugged in and basically being used as an expensive clock for years, all of the electronics are still receiving power, even if you are not playing CDs. If the unit was new in a box for 20 years, the electrolytic caps may still be like new.

@@georgeterbush2976 thank you!

It's still working but I prefer playing my Yamaha P71.

Hi Philip. I used the lubricant on both the bushing and on the inside of the metal key. Here is where I mention it in the video 11:55. Good luck with your restoration.

@@georgeterbush2976 Thank you!

Nice troubleshooting with the cold, then the soldering iron! Nice way to pinpoint which cap is causing the problem. Many people here have found that the 22uf cap above the one you replaced was culprit. See arrow in picture... www.dropbox.com/scl/fi/h5qvqv6z4fx6p46pli59m/IMG_1108-MPU-CD-board3-arrow2.jpg?rlkey=qcq6mnmmaajpor7gddvoaeilz&e=1&dl=0

Yep. that is correct.

This worked for me today. I still love my Bose sound. Who'd a thunk a hair dryer? SMH, so thankful it is once again operational. ☺️

@@aminaroseayeam2125 Of course it is only temporary. The cap (s) are still bad and will malfunction once they get cold.

Bad 22uF cap under the shield can, look at my post above your here.

Thanks for the hair dryer tip, it worked! I feel confident that taking the time to replace one or more capacitors will solve the issue.

Yep. Totally agree.

Thanks. I try to pack as much info into the videos as humanly😅 possible! LOL

Thank you! I hope my journy fixing my CAT synth could help others. At least show them what is inside. I have a few pictures that I took when it was apart. What were you looking for?

@@georgeterbush2976 hi! Well im trying to replicate the synth - or at least parts of it! So any detail would be much appreciated! Thanks in advance!

@@wawajanvier By "replicate" you mean reproducing the circuit boards, I do not have good enough pictures to do that.

I agree. The dielectric grease is still performing well on the synth, but if I were to do it again, I would use the Dow Corning Molykote 44. I restored my Korg digital piano and used the Molykote 44. ruclips.net/video/G96oP-ACREQ/видео.htmlsi=0t01yR7imm7T4ap5&t=408

Thanks for the comments. Really appreciate it. For the gas tank seam, I just used black electrical friction tape which is made of cloth and does not have a shine like the plastic electrical tape. I hated seeing the white seam on the gas tank. LOL. For the cowbell housing, I fabricated a custom metal bracket that fit between the V Twin engine. Unfortunately I sold the bike a few years ago so I can not take close up pictures. Good luck with your new vintage bike. I really miss mine.

Thanks for your comments. I really do appreciate it. I did a search for Korg c-900 service manual or schematics but nothing came up. When i bought my used C-15, it did not come with pedals. since I only use the sustain pedal, I made an adapter that converts the Korg connector into a 1/4" jack so I could use a standard pedal purchased off of Amazon. One possibility would be to contact Syntaur in Texas. They have all kinds of parts for keyboards. syntaur.com/Part-11514-Pedal-cable-Korg

Really appreciate the comment. The bushing and grease are still holding up. I was just playing it.

@@georgeterbush2976 Nice. I just ripped mine apart. Removed the old bushings, am cleaning key tops overnight, have to see about leveling the keys in the morning and then add the new bushings and put it all back together. What could possibly go wrong?

Thank you for your kind words and giving the video a thumbs up. It can be really discouraging to put so much time into making a video like this and not have any feedback. Yep, if some of your keys are sitting a little lower than others, the metal spring for those keys have chewed a notch into the plastic which gives the springs less tension. Good luck with this restoration. It's tedious but the results are good.

It was just the horn cover. I designed a custom bracket to attach to the engine. Behind the horn cover I hid a gas filter.

Sorry. I do not know where to find spare parts for the Donner pianos.

Perhaps a used broken one?

Yes, when the charger has completed the pulse repair, it displays "OFF". The first time on a battery may take over 24 hours.

@@georgeterbush2976 sir does your foxsur pulse repair battery charger still functioning until now 2024?

@@playstation2bigs Yes, it still works. I use it once a week for my various car batteries.

@@georgeterbush2976 capacitors inside not change? Still the Chinese made capacitors ?

@@playstation2bigs Yes, it still has the original capacitors. Is that a common problem with this charger?

Thanks for the feedback. I just added a link to the description so viewers can jump right to the fix at 4:55. I'm glad you were able to fix your keys.

Hello. help me deal with the same problem. What capacitor should I buy to replace it? which is under the cover to which the arrow points. Is UPW1C220MDD6 the right choice?

They are very hard to find. Maybe on ebay? www.ebay.com/itm/285098640327

@@georgeterbush2976 Thanks a lot! I let you know! Best regards Thomas

I also spent a lot of time looking for the right grease. Molykote makes the grease for Yamaha which is Molykote G-100GY, but it seemed really expensive. I went with Molykote 44 medium. Others have used it with success and so far, I like it.

I only have the Donner DDP-200. I have never seen inside of the DEP-20. Please let me know if you take it apart. Good luck!

Sorry. I have no idea.

Yep. When the capacitors warm up a little, they work somewhat.

You will need a remote to operate the Bose Wave II - AWRCC1

I had the same problem with it saying "Not Playable" on a CD I know is good and plays fine in my other players. So, I put it back in the Bose and let it blink about 15 times and it eventually accepted the CD and played it. These Bose machines get weak after many years of use and become somewhat temperamental.

I would love to know the answer to that. Do you have one to take apart?

I have some interesting news for you Laura!

You can try 409 or 827 check out this link where it is discussed... sherylcanter.com/wordpress/2010/01/control-a-bose-wave-radio-with-a-universal-remote/

I bought an aftermarket Bose remote on Amazon for my Bose, was $8.00, looks identical and works fine