Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: i don't want to ruin my keyboard but i can't find my adapter and I read something on line that said I could only use Yahama psr 420.  Is that true?
Document: Great keyboard, but have had is so long in storage we could not find the power supply.- great to find this and not have to burn 10 D cells every week! !
I purchased my Pwr+ Ac Power Supply in August and got it well packaged and ready to be used. I was really concerned about its size and light weight but this was soon alleviated after powering up only to discover it worked excellently.I normally use my Psr 740 at Church and social function in the Caribbean and am really happy with my Pwr+ Ac Power. It also fits perfectly in my " World Tour KC18S10 Deluxe Padded Keyboard" great combination.
Bought this power supply for my yamaha psr-500. i bought the psr-500 at a garage sale with no adapter. i was told by the previous owner that it had an issue with the volume if you turned it up too loud. with this adapter zero issues with the volume!! i read online that a bad or wrong adapter can cause the volume issue but this one works perfectly. cable and connectors are of excellent quality.
Great deal, worked perfectly for my old PSR Yamaha 500 piano. I was worried I wouldn't find the adapter to it thinking my piano is a bit outdated, but I came to the right place and found it here!
This power adapter is able to be used for both of the keyboards that I use at school. It made sense to buy one adapter for both keyboards, instead of buying a separate adapter for each of the keyboards. The price is great and the adapter works.
There's not too much to say. It's a power adapter, and it worked perfectly with the Yamaha keyboard I have. The one comment I would make is that the cord is slightly short than the original one that came with it. On the flip side, this is a simple wall wart power adapter, as opposed to the huge in-line transformer the keyboard originally came with. All in all, I'd say the wall wart is easier to deal with than the transformer model. Oh, and a final thought.
The power adapter for my Yamaha piano was exactly what we were looking for. So glad to not have to use only batteries. Great product!
Works perfectly, as the other reviewers said. I plugged it in, turned on the keyboard and the power light went right on. Don't worry,
This is a great charger for my Yamaha keyboard at a fraction of the price! I partuculary like the 6.5 foot cord so charger can plug into my power strip and actually have enough length to reach! I just got this so I can't testify to its longevity.
But, who needs that loud level out of the keyboard's speakers? in fact when I use my keyboard I do so with my Mackie V2 SRM 450 so I need not listen to my keyboard internal speaker. In all I am extremely happy with my  Pwr+ Ac Power Supply and would highly recommend it. You would not regret it.
Answer: No