Welcome to the Piano World Piano Forums
Over 2 million posts about pianos, digital pianos, and all types of keyboard instruments
Join the World's Largest Community of Piano Lovers (it's free)
It's Fun to Play the Piano ... Please Pass It On!

Gifts and supplies for the musician
SEARCH
the Forums & Piano World

This custom search works much better than the built in one and allows searching older posts.
Ad (Piano Sing)
How to Make Your Piano Sing
(ad) Pearl River
Pearl River Pianos
(ad 125) Sweetwater - Digital Keyboards & Other Gear
Digital Pianos at Sweetwater
(ad) Pianoteq
(ad) P B Guide
Acoustic & Digital Piano Guide
Who's Online
93 registered (AnimistFvR, angga888, anamnesis, 19 invisible), 1310 Guests and 16 Spiders online.
Key: Admin, Global Mod, Mod
Quick Links to Useful Piano & Music Resources
Our Classified Ads
Find Piano Professionals-

*Piano Dealers - Piano Stores
*Piano Tuners
*Piano Teachers
*Piano Movers
*Piano Restorations
*Piano Manufacturers
*Organs

Quick Links:
*Advertise On Piano World
*Free Piano Newsletter
*Online Piano Recitals
*Piano Recitals Index
*Piano & Music Accessories
*Music School Listings
* Buying a Piano
*Buying A Acoustic Piano
*Buying a Digital Piano
*Pianos for Sale
*Sell Your Piano
*How Old is My Piano?
*Piano Books
*Piano Art, Pictures, & Posters
*Directory/Site Map
*Contest
*Links
*Virtual Piano
*Music Word Search
*Piano Screen Saver
*Piano Videos
*Virtual Piano Chords
(ad) Estonia Piano
Estonia Pianos
Topic Options
#1233340 - 07/18/09 12:06 PM Petrof P115 issue
Synapse Offline
Full Member

Registered: 09/08/08
Posts: 68
Loc: Vermont
So I've had a Petrof P 155 Upright for almost 10 years. I've had some issues with keys sticking in the past, but these were all cured by the application of a humidifier or dehumidifier. About a month and a half ago, the C#5 key began to stop working. The key presses all the way down, but the action feels weird and it will often not make a sound when pressed or the sound will be very weak. Looking inside the piano, I can see that the hammer will often barely move at all when the key is pressed. Over time this has gradually gotten worse. I have also noticed that a similar problem has begun to occur with the Ab4 key and also the D4 key. I have a piano tuner coming on the 23rd to check it out, but I'm wondering if anyone else has had a problem like this before. I haven't had a dehumidifier near the piano yet, so I moved mine up from the basement last night. Could this possibly be a problem with humidity? Or is it something more serious?

Top
(ads 568) Hailun Pianos

 

#1233369 - 07/18/09 12:52 PM Re: Petrof P115 issue [Re: Synapse]
Jeff Clef Offline
4000 Post Club Member

Registered: 10/05/08
Posts: 4437
Loc: San Jose, CA
It's uncommon... but could the keystick be broken? They are weaker in the middle and are also under the greatest stress at the pivot point.

Just guessing. It is repairable, if that's the story.
_________________________
Clef


Top
#1233380 - 07/18/09 01:07 PM Re: Petrof P115 issue [Re: Jeff Clef]
ChrisVenables Offline
500 Post Club Member

Registered: 03/03/09
Posts: 727
Loc: Hampshire, England
Pics of the inside would be a help.

If the key presses down all the way and the hammer doesn't move and is in its correct 'at rest' position, sounds like the jack centre pin has tightened due to too much humidity and has escaped from underneath the hammer butt. The other possibility is that the hammer flange centre pin has tightened (if the hammer is slightly forward of the 'resting' position then the jack will not be in contact with the hammer butt either). The dehumidifier may solve it, but don't have it too close to the piano or it could dry it out too much. You should have your dehumidifier on throughout the non central heating period if it's humid in Vermont.

Alternatively get your tech to put some 'Prolube' (nothing else) around the centre pins to ease them or maybe even prevent them from seizing in future. Recentering the action is a costly business - Prolube is worth a try first.

Humidity level should be around 50% for trouble free playing in a modern piano.
_________________________
Tech. & Partner: Venables Pianos
Yamaha Piano UK main dealer and Grand Piano Centre
Stocking new Yamaha, Petrof and Venables & Son

Top

Moderator:  Ken Knapp, Piano World, Rickster 
What's Hot!!

Trade Regrets:
Barry "Bear" Arnaut

(ad) Yamaha CP Music Rest Promo
Yamaha CP Music Rest Promo
Ad (Seiler/Knabe)
Seiler Pianos
(ad) HAILUN Pianos
Hailun Pianos - Click for More
(125ad) Dampp Chaser
Dampp Chaser Piano Life Saver
(ad) Lindeblad Piano
Lindeblad Piano Restoration
(ad) Piano Music Sale - Dover Publications
Piano Music Sale
Sheet Music Plus (125)
Sheet Music Plus Featured Sale
New Topics - Multiple Forums
Problem with mothergoosetools.com website
by daniokeeper
11/26/14 02:33 AM
New piano student
by IWG.
11/26/14 01:18 AM
Technique for holding down chords
by DeadPoets
11/25/14 11:07 PM
Steingraeber A170 vs. Steinway M - appreciate helpful input
by ElaineAllegro
11/25/14 09:26 PM
Rachmaninov Sonatas - 1 vs 2?
by iObsessed
11/25/14 08:07 PM
Forum Stats
77053 Members
42 Forums
159358 Topics
2340906 Posts

Max Online: 15252 @ 03/21/10 11:39 PM
Gift Ideas for Music Lovers!
Find the Perfect Gift for the Music Lovers on your List!
Visit our online store today.

Visit our online store for gifts for music lovers

 
Help keep the forums up and running with a donation, any amount is appreciated!
Or by becoming a Subscribing member! Thank-you.
Donate   Subscribe
 
Our Piano Related Classified Ads
|
Dealers | Tuners | Lessons | Movers | Restorations | Pianos For Sale | Sell Your Piano |

Advertise on Piano World
| Subscribe | Piano World | PianoSupplies.com | Advertise on Piano World | Donate | Link to Us | Classifieds |
| |Contact | Privacy | Legal | About Us | Site Map | Free Newsletter | Press Room |


copyright 1997 - 2014 Piano World ® all rights reserved
No part of this site may be reproduced without prior written permission