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#1162941 - 03/14/09 11:38 PM Poor repetition
Don L Offline
Full Member

Registered: 03/29/06
Posts: 59
Loc: Minnesota
My customer has a 45+ year old Packard studio. A problem has developed where several of the keys won't repeat....it happens more so when the sustain pedal is depressed.

I have checked for lost motion, lubricated jack pins and the buckskins appear in good shape. Is it possible the keys need some additional weight in the form of a small key lead? What about stretching the spring? Any other things come to mind?

Thanks

Don

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#1162956 - 03/15/09 12:05 AM Re: Poor repetition [Re: Don L]
Keith Roberts Offline
1000 Post Club Member

Registered: 05/04/04
Posts: 1984
Loc: Murphys, Ca
The wippen flange is sluggish.
_________________________
Keith Roberts
Associate, PTG
Keith's Piano Service
Hathaway Pines,Ca

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#1163058 - 03/15/09 09:08 AM Re: Poor repetition [Re: Keith Roberts]
Dave Stahl Offline
1000 Post Club Member

Registered: 05/06/07
Posts: 1645
It could be a tight hammer flange as well. Possibly a tight key bushing, but that isn't too likely on a 45 year old piano.
_________________________
Promote Harmony in the Universe...Tune your piano!

Dave Stahl, RPT
Piano Technician's Guild
San Jose, CA
http://www.youtube.com/watch?v=JAniw3m7L2I
http://dstahlpiano.net

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#1163080 - 03/15/09 10:32 AM Re: Poor repetition [Re: Dave Stahl]
Sam Casey Offline
1000 Post Club Member

Registered: 02/05/05
Posts: 1135
Loc: SW Missouri
Sytematically follow the resistance, starting with keybushings. Then hammer flanges, jack movement and wip flanges. Be systematic. After resistance is eliminated as a cause, check for proper blow, dip, check and letoff. Placing a lead at the back of the key is treating a symptom and NOT the cause. The action is designed to work and if it does not it is either too much resistance in the moving parts or poor regulation.


Edited by Sam Casey (03/15/09 10:47 AM)

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#1163127 - 03/15/09 12:03 PM Re: Poor repetition [Re: Sam Casey]
BDB Online   content
Yikes! 10000 Post Club Member

Registered: 06/07/03
Posts: 21826
Loc: Oakland
The most common cause is the easiest to fix: the butt springs are out of place. As I said elsewhere, start with the simplest possibilities first.
_________________________
Semipro Tech

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#1163147 - 03/15/09 12:55 PM Re: Poor repetition [Re: BDB]
rysowers Online   content
2000 Post Club Member

Registered: 04/16/07
Posts: 2472
Loc: Olympia, WA
Weak jack springs can definitely cause this problem, and can be tricky to diagnose if you haven't come across it before. They may still be strong enough for the jack to return, but the action design may require that they be strong enough to assist the upward motion of the key. I have sometimes stretched the spring with some success, other times it's not enough.

One of the real clues will be that if you step on the quiet pedal and then depress some keys, the keys won't return all the way to their rest position.

If you've checked all the obvious stuff and your still having trouble, try replacing one jack spring and see how it works.
_________________________
Ryan Sowers,
Pianova Piano Service
Olympia, WA
www.pianova.net

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#1163338 - 03/15/09 08:37 PM Re: Poor repetition [Re: rysowers]
Jerry Groot RPT Offline
6000 Post Club Member

Registered: 11/07/07
Posts: 6828
Loc: Grand Rapids Michigan
You might also check the flange bushings for things like, elongation of the bushing holes, crooked birds eyes, or wear, along with checking the flange pins themselves for corrosion or something as simple as a burr inside of the bushing on the pin. Many possible causes including poor regulation, tight key bushings (on any age piano depending on the weather conditions and time of year) or a damper spoon digging into the damper lever...
_________________________
Jerry Groot RPT
Piano Technicians Guild
Grand Rapids, Michigan
www.grootpiano.com

We love to play BF2.

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#1163418 - 03/16/09 01:50 AM Re: Poor repetition [Re: Jerry Groot RPT]
Keith Roberts Offline
1000 Post Club Member

Registered: 05/04/04
Posts: 1984
Loc: Murphys, Ca
Actually you should start at the front of the key when looking for a problem. Even if key bushings are worn, they can be dirty and sluggish. Lube them. Polish the capstan, teflon the wippin pad Then move to the wippen flange. Take the bridle strap and the key out of the picture. Step on the pedal when testing the wippen
If you have gotten this far and haven't found the problem, it's the wippen flange or the jack flange. A sluggish hammer flange will repeat if the bridle strap slack is adjusted tight.
_________________________
Keith Roberts
Associate, PTG
Keith's Piano Service
Hathaway Pines,Ca

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#1163478 - 03/16/09 07:57 AM Re: Poor repetition [Re: Keith Roberts]
UnrightTooner Offline
4000 Post Club Member

Registered: 11/13/08
Posts: 4954
Loc: Bradford County, PA
Many good suggestions, especially BDB’s of checking the easiest things first. Then with baffling problems a step by step approach is best.

Something that was not mentioned, and happens on older pianos, is insufficient lost motion. If there is a divot in the butt leather where the jack strikes, the jack may not be able to reset unless there is some lost motion.
_________________________
Jeff Deutschle
Part-Time Tuner
Who taught the first chicken how to peck?

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#1166980 - 03/22/09 08:50 PM Re: Poor repetition [Re: UnrightTooner]
Don L Offline
Full Member

Registered: 03/29/06
Posts: 59
Loc: Minnesota
Thanks for all of the input.

Taking a systematic approach was very beneficial. I removed the problem key(s) and tried to simulate the problem by manually lifting the wippen. Everything worked perfectly. That meant the problem was most likely in the key...or improper capstan adjustment. I discovered the key bushing to be slightly tight. I cleaned the balance pins / guide pins, lubricated pins and eased the bushing. Problem solved. Thanks again.

Don

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