Casio SA21 (SA-21) Keyboard Repair & Restore 

I agree. Nice thing. It's my most viewed video by a long way. Thanks for your comments

Oh Antara I am so sorry for the loss of your dad. I lost mine 10 years ago and I miss him every day. I hope you get your keyboard repaired. Thank you so much for your heartfelt messages ❤️ ♥️

This is actually my most watched video by a good margin. Seems to be very popular in India where many views come from. Nice to have some international reach. I often get enquires how much it would be to ship the keyboard to India. Thanks again

@@RetroTechRepair This is one of the very popular musical instrument for the Indian kids in the late 90s and early 2000 almost all of my friends have it along with me. No doubt its worth watching n gives a nostalgic vibe.

@@animeshtirkey933 Thanks, it's my most popular video by a mile! Thanks so much for explaining why. I'm so glad you enjoyed the video thanks so much for explaining and for your comments.

Thanks.... yeah rookie mistake on my part oddly though this is my most viewed vid by a mile! Thanks for your comments hope you enjoy the channel.

Cool!

Hi Chris, thanks for your detailed comments that's a good suggestion, I hope to do a few more keyboards soon. I don't play so I'm always concerned the keyboard repairs are a bit "light" as I just jab at buttons once I have fixed them. If I find one without a protection diode I will definitely do a mod video. Great idea. Nice feedback on alternative models too, I bet they use the exact same IC. Thanks again for feedback. Hope you enjoy the content

@@RetroTechRepair Yes same silicon chip inside, but many different IC packages. Have a lot of service manuals and have done some research as wanted to increase number of keys on a number of models, but its not possible on most. What Casio and Yamaha appeared to do (way back) is produce the same IC on same die, but package differently for different models, that is connect different pins to the silicon to the outer pins on the plastic package. Its cheaper to fabricate a single fully functional IC then do a different package run, it means that only certain features are available and there are limited easter eggs available. Some, but not the full potential of the silicon. Hope thats not too geeky! ;)

... Deductive reasoning. Going by service manuals, the SA series has half a dozen (or more) versions of same IC, same number, but with 'versions' e.g. -16, -08 at the end. They all have same sounds, but slightly varying pin-outs and in some case reduced pin numbers (cheapest ones). Bet its exactly the same silicone inside as silicon design & fabrication is the expensive bit. I guess the best potential for easter eggs would come from the most functional models with most number of pins.

Great! Happened to me too. The polarity Casio chose for their keyboards seems far less common than the other way around.

RetroTechRepair exactlyy , also really appreciate you doing such a thing , wholesome!!!

I may sound stupid but what's "polarity" in keyboards?

That's nice.

Great to have you along Dave 👍 and another huge thanks to MMV.

Sorry I can't help

Glad you enjoyed the video!

thanks for your comment

kshama karen, mujhe nahin pata

Sorry Quelhas. This is quite an old video now and I don't have the keyboard any more. Sorry I cannot help

Good to hear!

@@RetroTechRepair :)

I'm no expert I think I'd check for electrical continuity between the button contacts and connection to the processor on case their has been battery leak damage. I'd also clean the button contacts on the board and carbon pads on the back of the buttons I case it's had something spilled on it or they have oxidised. Like I say I'm not an expert so this isn't advice it's just what I would do. Cheers

@@RetroTechRepair Thanks a lot for the answer, I'll try! :)

Thanks!

Sorry I can't help. Bit thanks so much for your question

thanks for your comment

thanks for your comment

Hi Jaydeep, sorry I don't have the keyboard anymore so I can't help diagnose much. Perhaps try checking the printed circuit board and test components on it.

@@RetroTechRepair thanks for your response

You are very welcome.

Sorry I don't know what happened

Same problem

I can't give advice but if it were my keyboard. I would try cleaning the battery terminals. You may need to remove the back cover to access the spring terminal and clean off any rust

Hey i am facing the same problem.. pls suggest anything that worked for you

Great tip. Thanks. I haven't tried GT65 but did try WD40 and it worked a treat. Thanks 👍

Sorry I don't have the keyboard anymore. So sorry

@@RetroTechRepair ok. Thanks for replying 👍

Hi Charles thanks for watching the video. This was a simple repair and I didn't need the circuit diagram so I don't have it. But I typed Casio SA-21 schematic into google and it identified several free sources. Sorry I can't be more help

Sorry I do not know 😟

My power supply was a universal adapter which had a reversible DC plug.

Mine isn't working via power supply. I don't know how to fix it. Can you please help, can you please elaborate how to get that working.

You can connect adopter also , don't connect more than 5.5 v power

yes do electricity! Thanks so much for your comment.

I don't know for sure but Think it might be 7.5V centre -ve. Current is low maybe 500mA

Good to hear. Glad you enjoyed the video. Thanks so much for your feedback

Actually, yes 1991 I think. Thanks SO much for the clarification 😊

@@RetroTechRepair you are welcome 👍

thanks for your comment. Glad you enjoyed the video

Hi! Thanks for your comments. Unfortunately I do not know of a repair shop. Sorry

Happy to bring back some fond memories

Sorry I don't know

Thanks for your comment

Sorry no :( thanks for enjoying the video

Sorry I do not know

Sorry I can't help

Sorry I don't have it anymore

Sorry. I don't sell products

Hi Badhon. Good idea., I'm sure there are many mods that can be done. Maybe we cam circuit bend one on day. Thanks so muchbfor your feedback

Sorry no. The keyboard is not for sale

@@RetroTechRepair ok,, tnx

Hi, this was a lot of 2 keyboards I bought on eBay. I paid 15 GBP for the two. The other one will feature in a future vids. I gave this SA21 to charity. I dont repair professionally, just for fun. The cost to me of this repair was very little. Thanks for your comments

Interesting

I am belonging from Maharashtra

Sorry I can't help. Thanks for your question

Yup

thanks for your comment

Thanks for your comments. The keyboard is not for sale

Sorry I do not know

Great little keyboard. Sadly I don't have mine anymore

Sorry not for sale

Sorry. I don't speak Hindi but if somebody wants to translate and add subtitles let me know

thanks for it

Sorry. Not available. Thanks for looking.

Thanks for your comment

Sorry it's gone. it was donated to charity.

what's still there. type sa 45 and 21 keyboard I was looking for. for extracurricular music school br

@@pangeranzal0978 sorry it's gone

do you have an fb account so that I can get to know me from Indonesia ..😊

@@pangeranzal0978 @retrotechrepair

Sorry I don't have the keyboard anymore. Glad you enjoyed the video.

@@RetroTechRepair Bhai sa21 keyboard he kya

Thanks for your comments

Sorry no. It is not

Thanks for your comment

Great. Thanks for your comment

Sorry it is sold.

casio price sir plz

Ma'am milta hai

Kaha milta hai

thanks for your comment

thanks for your comment

thanks for your comment

Thanks for the comment. I have no idea what it says, but thanks anyway!

@@RetroTechRepair he says "Where do you get" ( google translate XD)

Sorry I can't help

Thanks

Thanks

Sorry I don't have it anymore

England

thanks for your comment