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#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?

Hailun / Pearl River Pianos

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#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: 4530
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.

#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: 771
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.
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