[CAUT] Renner replacement back action problem

[G Cousins]

Thoughts...
Try raising the damper and dropping it.  (onto the key) 
Perhaps a loose lead? 
Also may want to contact the gang at Renner... Technician on demand http://www.rennerusa.com/TechOnDemand.asp
Good luck,
Gerry C
WCUPA
 


Date: Wed, 25 Aug 2010 12:37:46 -0500
From: bill at a440piano.net
To: caut at ptg.org
Subject: Re: [CAUT] Renner replacement back action problem

Shelley,


I would suggest that the spring is probably not there.  Since the noise is only heard when the key activates the damper lever, I would first look at the action at notes 43 and 44.  Maybe the spring is there and lodged between a couple keys.  Then, possibly something at the key end felt/underlever interface.  If with the action removed you can lift the offending dampers and cannot detect any difference between Eflat 4 and E4, the problem is likely not in the damper/underlever assembly.


Good luck,
William R. Monroe



On Wed, Aug 25, 2010 at 12:11 PM, Shelley <srbanders at sbcglobal.net> wrote:

This back action was replaced about 8 years ago by another tech, I've had
problems with it all along.

Now here is one that I need help on figuring out.

This is a Steinway L in a basement ensemble practice room that is not air
conditioned (so windows are left open) and has a Dampp-Chaser system.

The Eflat and E (center octave) started clicking a while ago and we just got
time to take it apart and try to figure out what happened.  The E damper
spring is gone.  Could Not Find It Anywhere!!! Amazing that it still damps
and never sticks.  We removed both dampers and used every method that we
could think of to find it, it must be in there because it is clicking.  Sort
of a grinding click on the return.  But, Only when the keys are activating
it is it audible, when one works just the dampers there is barely a whisper.

What the heck is going on?  Anyone ever run into this problem?  We've looked
everywhere in the action the trap, the back action.  Are those springs solid
brass?  Nothing is attracted to a magnet everywhere we have tried.

Help or ideas will be greatly appreciated.  Of course, avoiding removal of
the entire damper system is the aim.


Thanks for your input.

Shelley Byrd Anderson
North Park U.
Chicago




 		 	   		  
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