Piano accordion rattling sound - Music

Troubleshooting on a similar model here, but unless you are an electronics engineer, you will need a Casio Service Centre

https://www.ifixit.com/Wiki/CASIO_CDP-230R_Troubleshooting

https://www.google.com/search?q=Casio+COP-100+Digital+piano+no+sound

..

Ask direct. It isn't available online. Just specs, advertising and reviews.

Alesis Cadenza

https://www.alesis.com > products > legacy > cadenza

Alesis Cadenza - 88-KEY, HAMMER-ACTION DIGITAL PIANO. ... Cadenza. Overview: Features: Specs: Downloads: Videos and images ...

Alesis Cadenza digital piano review

https://www.digitalpianoreviewguide.com > alesis-caden...

Simply put, the Alesis Cadenza is not a quality digital piano. With its lack of durability and constant maintenance issues, along with a horrid sound quality, ...

Cadenza - Rackcdn.com

https://7132afa424c2f1a2ab6d-54d68a14e2e7c1f76563a2d8c3e9fd82.ssl.cf2.rackcdn.com > ...

PDF 88 hammer-action keys for full piano range with graded, weighted feel ... The Cadenza is an 88-key, graded hammer-action digital piano with the sound,.
1 page

..

https://www.roland.com/global/products/fr-4x/
https://www.roland.com/us/support/knowledge_base/203033135/
https://www.long-mcquade.com/74269/Band---Orchestral/Accordions/Roland/V-Accordion---Red.htm
https://www.gear4music.com/Woodwind-Brass-Strings/Roland-FR-4X-V-Accordion-with-Keyboard-Black/1PBQ
https://www.gumtree.com.au/s-nsw/keyboard+piano+roland/k0l3008839

On average about $200 - $500
depending on many factors, having the original box adds value also.
I can pass this info to a friend that owns a music store and try and get a more accurate price value?

bass piano accordion Key layout Google Search

thats a motherbord problem./ ic called tone generator which is usually faulty.

Call Yamaha at 714-522-9000 to find local dristubators/ liscend yamaha dealers. You may also visit the yamaha website.

If this is a brand new unit, exercise your warranty!

BUT FIRST see if packing material worked through the speaker grill... you know littel pieces of the packing peanuts or otherr contamination that sits in the speaker cone and rattles.

You would be very surprised of how few moving parts are in side one of these keyboards. There is no fix to the action,trust me. play the day lights out of it until it stops then get a new one. Have some fun and explore, if you find an old one that is shot, take it a part and you will see what I mean. These units are really a disposable instrument.
I hope this doesn't disappoint you . I hope it helped. Keep on rockin in the free world. DFD