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Clavinova CVP-50 No Sound troubleshooting #2800723
01/11/19 12:02 AM
01/11/19 12:02 AM
Joined: Jan 2019
Posts: 3
M
MarkAero Offline OP
Junior Member
MarkAero  Offline OP
Junior Member
M

Joined: Jan 2019
Posts: 3
Recently purchased 1989 CVP-50 played fine for several days after being brought home, then stopped producing any audio in response to piano keys, accompaniment, or rhythm selections. Speakers now only produce barely audible white noise whose level is unaffected by volume slide control. White noise cuts out when headphones are jacked-in but is not reproduced on headphones. Headphones do produce very loud pops coinciding to relays on audio board kicking in and out on power-up and power-down. Hooked up RCA audio output jacks at piano rear to aux input of Bose speaker and got no sound. I suspect a fault in the amplifier assembly, either in the audio board (PU60P) or the power amp (PU60M). These circuit boards appear to be identical to those of a CVP-20 currently in Syntaur’s inventory, judging by comparison to the these photos from my CVP-50: https://photos.app.goo.gl/uGsZQ9uMWzgvm8RC6 1

Seeking feedback from the Piano World digital piano forum regarding a recommended course of action. Are the symptoms I describe consistent with a failure in the amp? Are there any simple tests I can do with a multimeter to confirm my amp is bad before commiting to buying a replacement? I’d appreciate any advice you can offer.

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Re: Clavinova CVP-50 No Sound troubleshooting [Re: MarkAero] #2801338
01/12/19 05:54 PM
01/12/19 05:54 PM
Joined: Aug 2017
Posts: 953
Portland, OR, USA
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Osho Offline
500 Post Club Member
Osho  Offline
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O

Joined: Aug 2017
Posts: 953
Portland, OR, USA
Did you try doing a factory reset? Also, if you use it as a midi controller with a computer - can you play it using a VST software (e.g. with Pianoteq - which has a free demo that you can download to test this)?

Osho


Mason & Hamlin BB
Kawai Novus NV10 + Embertone Walker D Full/Garritan CFX/Pianoteq 6

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Re: Clavinova CVP-50 No Sound troubleshooting [Re: MarkAero] #2801696
01/13/19 09:10 PM
01/13/19 09:10 PM
Joined: Jan 2019
Posts: 3
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MarkAero Offline OP
Junior Member
MarkAero  Offline OP
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M

Joined: Jan 2019
Posts: 3
Thanks for your reply. According to the service manual, there is no factory reset on the CVP-50 but there is a diagnostic test mode that is entered by holding down the first and last keys while powering on the piano. None of the tests designed to produce audible output (sinewave at a predicated frequency) produced sound. I don't have any midi cables to perform the test you've suggested. I was able to download the service manuals for both the CVP-50 and -20 models and verify that the PU60P audio boards are populated with the same components and connectors, while the PU60M power amp boards differ only by the presence of 2 air core coils found on the CVP-20 that are absent on the CVP-50 board. Since I was planning on replacing both boards at the same, I think the risk is minimal that the CVP-20 boards won’t provide the same functionality. I’m going to assume the risk and order the boards. I'll post again to let you know if the swap out solves the problem.

Re: Clavinova CVP-50 No Sound troubleshooting [Re: MarkAero] #2803789
01/19/19 12:31 AM
01/19/19 12:31 AM
Joined: Jan 2019
Posts: 3
M
MarkAero Offline OP
Junior Member
MarkAero  Offline OP
Junior Member
M

Joined: Jan 2019
Posts: 3
Here's the follow-up I promised: Swapping out the power amp board did the trick. The CVP-20 board appears to be identical in form and function to that of the CVP-50. Audio is restored! Thanks Syntaur.com for having the used part in stock.

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Re: Clavinova CVP-50 No Sound troubleshooting [Re: MarkAero] #2803845
01/19/19 06:36 AM
01/19/19 06:36 AM
Joined: Oct 2018
Posts: 418
UK
thickfingers Offline
Full Member
thickfingers  Offline
Full Member

Joined: Oct 2018
Posts: 418
UK
Originally Posted by MarkAero
Audio is restored! Thanks Syntaur.com for having the used part in stock.

Don't thank them, it was a fluke!
Hope you didn't have to wince too much at the price of the unit. Glad all is well, happy tinkling! grin

EDIT--Oh, I've just thought...could be a three post wonder, get his problem sorted and then disappear!
Ah, well...our work here is done.

Last edited by thickfingers; 01/19/19 06:40 AM.

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