Uh, last I looked, each set of 6 solenoids had a fuse. (.. and so he ambles out to the shop) I randomly checked three solenoids from a collection of mine and all three read 12.4 ohms. While I was at it I looked at an old 1992 and 1997 driver board and they both had the same basic design with a fuse (f2, f3, f4, etc) for each header of 6 solenoid groups. Their basic driver board design hasn’t changed much over the years ......... just the driver CPU and it’s support components. I have a PDS unit installed in a piano here at home and in the day of MIDI flowing freely on the internet I was able to d/l some bluegrass MIDI’s and assigned a zone on the keyboard to play each instrument of four .... bass, banjo, fiddle, guitar. (computer driven using a 128 plus as a translator) The resulting data traffic was so intense and involved it locked up the CPU’s and I had to turn the thing off to get them to reset ............ but it never caught fire. Over time I heated up (abused) enough solenoids to seize up about half of them but they never blew any fuses. By the time I turned it off for the last time I had enough MIDI files to rock the shingles off this house for hours non-stop. (Donna Summers, Ike and Tina Turner, Aretha Franklin, Blondie, lots of Rolling Stones, some Beatles, and a choice few from this century) The hammers got hard as a rock and the action got really loose but the player still rocked. QC at PDS has slipped a bit lately I agree. Each kit I’ve installed lately has had something missing or the wrong version of cable etc. After amassing a collection of PianoDisc doodads over the decades I’ve managed to get through most of their oversights with inventory laying around. I can live with the changes. It’s the process I have to go through to get things rectified that I have major issues with. The last one took over 30 phone calls and I think it was 2 and a half months in duration. I just tuned that installation a week or so ago. The customer is totally happy with the player. He’s using an iPad to drive it. A smoky smell is a fuse that did it’s job ........ most likely. I’ve had a few. I swapped out the offending stinker (PCB) and was able to make the customer happy. It happens. Take a deep breath, pour yourself a tall frosty one and dream about fine babes delivering pianos. If a bad solenoid blows a board, wouldn't a good design protect the board with a fuse or breaker. Much cheaper than a new board. -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://www.moypiano.com/ptg/pianotech.php/attachments/20120907/a827a940/attachment.htm>
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