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#2250252 - 03/21/14 11:33 PM GEM pRP6 keyboard problem  
Joined: Mar 2014
Posts: 3
stogazull Offline
Junior Member
stogazull  Offline
Junior Member

Joined: Mar 2014
Posts: 3
Hi
This is my first post so first i thanks everyone for the good advices you can find on the forum, thank you guys.
I have a piano GEM model pRP6 and i have a problem with the keyboard, some keys are working fine some are not working at all, i did a fix already on the keyboard few weeks ago and it worked well until now, same problem now, before i found some oxide on the connectors and chip of the keyboard control board, i did resolder the pins and the sound came back.
Unfortunatly now i have the same problem, some octave are working some not, the octaves 1,2,7and 8 are working but nothing in the midle, i did test again all the connection and seems like all i good so i am thinking that the decoder on the control board of the keyboard may stop working.

Before to try to sobstitute the chips i would like to have some advice from you guys to know if i am looking in the right direction or not or if there is some test i can try to do before remove and replace the chips

Thank you

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#2250374 - 03/22/14 07:49 AM Re: GEM pRP6 keyboard problem [Re: stogazull]  
Joined: Apr 2007
Posts: 16,228
Morodiene Offline
Yikes! 10000 Post Club Member
Morodiene  Offline
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Joined: Apr 2007
Posts: 16,228
Boynton Beach, FL
I can't offer any advice on fixing what you have, but something with 32-note polyphony and half-weighted keys, well, it might be time for an upgrade since it seems to be failing. Maybe we can help you find something comparable that's new and under warranty.


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#2250505 - 03/22/14 01:23 PM Re: GEM pRP6 keyboard problem [Re: stogazull]  
Joined: Feb 2009
Posts: 714
Jake Jackson Offline
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Jake Jackson  Offline
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Joined: Feb 2009
Posts: 714
Atlanta, GA
Are you sure that you didn't call up a split or another preset created by a previous owner? (Does it behave this way if you just boot the keyboard and play the default piano?)

#2445757 - 07/30/15 04:17 AM Re: GEM pRP6 keyboard problem [Re: stogazull]  
Joined: Mar 2014
Posts: 3
stogazull Offline
Junior Member
stogazull  Offline
Junior Member

Joined: Mar 2014
Posts: 3
hi
I am back after long time and still fighting with the piano, i did few fix on the power board and replace the 3 decoders 74hc138 and it was good for about 1 hour but then fail again.... now i poweron and all is working good but after 5 minutes some of the key doesn't work any more.... any idea what can cause the problem ?

thank you very much

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#2445758 - 07/30/15 04:18 AM Re: GEM pRP6 keyboard problem [Re: Jake Jackson]  
Joined: Mar 2014
Posts: 3
stogazull Offline
Junior Member
stogazull  Offline
Junior Member

Joined: Mar 2014
Posts: 3
Originally Posted by Jake Jackson
Are you sure that you didn't call up a split or another preset created by a previous owner? (Does it behave this way if you just boot the keyboard and play the default piano?)


yes with default piano same same and i did board reset many time...


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