Question about Music
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Posted on Jan 02, 2017
Find the coil voltage and whether it is AC or DC coil andd the contact configuration. The search for relays at Digikey,com, Mouser.com, and others.
DO NOT replace the relays UNLESS you can see that the contacts are bad and fail to close. If the relay fails to move, verify the coil is open with an ohmmeter since a bad driver transistor will fail to actuate the relays.
OFTEN you can fix a sticky relay. You may find contamination in the magnet area that keeps it from closing. Remove a relay and actuate it observing operation looking for the problem.
SOME relays are used to protect speakers if the power amps don't balance... one can damage the speakers in this case. Manually actuating those relays will result in a pop in the speakers although sound MAY come out.
Posted on Jan 23, 2011
You'll likely need to try removing the keys, so you can see if something is stuck underneath it. That would be my first move.
In order to do this, follow these steps:
The front panel and the keyboard fall are designed to be easily removed for tuning purposes anyway.
To check it out....The front panel likely has a little clip either side near the top on the inside. Just undo these clips and lift the panel out. The keyboard fall should then be easy to lift out too.
There may be a long wooden rail which you need to take out also. Once inside, the keys themselves can be carefully lifted off the central spikes on which they sit.
Remember how you did this so you can get them back in again.
Since your piano is so old and worn, Often times, the wooden rail in front of the keys (just above your knees when you are playing) bows inwards a little due to age and temperature/humidity fluctuations. This then causes the little white front bit of the keys to jam against the wood and you have to physically lift the keys back up to return them.
If this is the problem you will need to take out the keys and shave some wood off the inside of this rail to allow the keys to move up and down freely again.
Or sometimes you may find you have a small object caught under a key or two. Much simpler to remove and free up your keys, if this is your problem..
Hopefully, this is all you will find wrong with your piano.
If all else fails...
I wouldn't attempt to tune your piano by yourself. I would seek out an experienced piano tuner for that.
But it is worth attempting to repair it first before you go that far.
Good luck !!
Posted on Feb 27, 2015
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