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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Yamaha P120 piano, 2004
Looks like another victim of lead-free solder in the power handling areas.
Reason for posting - idle curiosity. I'm not going to unnecessarily delve into the keyboard section to find out. I was surprised to see just an 8 way ribbon cable going to an 88 key, 7+ octave keyboard. I assume there is active multiplexing hidden in there , but would there be "touchy-feely" action monitoring as well.? -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/ |
#2
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Yamaha P120 piano, 2004
N Cook schrieb:
Looks like another victim of lead-free solder in the power handling areas. Reason for posting - idle curiosity. I'm not going to unnecessarily delve into the keyboard section to find out. I was surprised to see just an 8 way ribbon cable going to an 88 key, 7+ octave keyboard. I assume there is active multiplexing hidden in there , but would there be "touchy-feely" action monitoring as well.? Why not? I assume you'll find a keyboard processor and 2 contact bars to measure the time/velocity of each key, possibly divides into 8- or 12-key groups. Udo |
#3
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Yamaha P120 piano, 2004
Udo Piechottka wrote in message
... N Cook schrieb: Looks like another victim of lead-free solder in the power handling areas. Reason for posting - idle curiosity. I'm not going to unnecessarily delve into the keyboard section to find out. I was surprised to see just an 8 way ribbon cable going to an 88 key, 7+ octave keyboard. I assume there is active multiplexing hidden in there , but would there be "touchy-feely" action monitoring as well.? Why not? I assume you'll find a keyboard processor and 2 contact bars to measure the time/velocity of each key, possibly divides into 8- or 12-key groups. Udo All I can see is the counterbalance rods and leaf springs per key, including shining a torch down the length of the rear of the key bank. I suppose the bank of counterweights (hence weight of that whole section) compared to return springs means that touch force can be more evenly inferred from timing intervals per key press. -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/ |
#4
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Yamaha P120 piano, 2004
Meat Plow wrote in message
... On Mon, 07 Jan 2008 14:09:05 +0000, N Cook wrote: Looks like another victim of lead-free solder in the power handling areas. Reason for posting - idle curiosity. I'm not going to unnecessarily delve into the keyboard section to find out. I was surprised to see just an 8 way ribbon cable going to an 88 key, 7+ octave keyboard. I assume there is active multiplexing hidden in there , but would there be "touchy-feely" action monitoring as well.? Yes. Now I have it working , yes , its rate sensitive. Forte is loud. Play a note too pianisimo and it fails to register at all, taking say 3 seconds or so from first finger touch to bottoming. I assume that is normal. -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/ |
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