Originally posted by Tonewheeldude:
Does your tech have access to full service manuals? there are a huge ammount of tests you can do on the tyros 2. If he is an authorised engineer he can download the PDF file from YSISS. There is a seperate file for tests called Tyros2_TES.pdf.
The model number for Tyros 2 is: TRSMS02
It does sound like a cracked board (unlikely though unless you really whacked it) or a shorted data line. the latter is a piggy to find, sometimes its just the leg of a component touching somewhere it shouldn't and can be anywhere from the DM board itself to one of the control PCB's or even a cable that has perferated slightly or was trapped between panels during assembly.
TWD
[This message has been edited by Tonewheeldude (edited 02-21-2010).]
He was able to pull up the service manual online with all the exploded views, part numbers, etc. If you ever get the opportunity to view this at your repair shop, its very cool. Every component is a hotlink to its individual replacement part.
He started with the switch test and as we expected, came upon an issue when he got to that area of the board. He then suspected a problem with one of the "SA data lines" based on continuity tests...
After more testing for continuity, he traced the problem back to the cpu chip.
He did make the comment that it was beneficial to him that I play a high end Yamaha. Apparently the way they configure their circuit boards make it tech friendly to find these problems. He said if it were a different brand, he would've found it, but it might have taken him longer.
Ditto to what Gary said as well. My wife calls me Noah because I have two of everything, lol...
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Bill in Dayton
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