General Category > Lisa Troubleshooting and Repair

Widget servo twist

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sigma7:

--- Quote from: ried on February 05, 2023, 08:51:21 pm ---Update 2: The drive is seen by BLU 0.9 now, and responds to the Exercise / Test Disk function, for example. It goes through the physical motions of the exercise, and eventually generates an Error E803

--- End quote ---

In BLU 0.90, Error E803 is reported when a Widget's command response is abnormal -- something other than (theCommand+2).

Now that the Widget code is available one might be able to figure out what causes that. In this case I'd guess it is "sorry, I can't do that Dave"

edit: BTW, since this forum isn't designed to generate revenue, there is no problem mentioning or linking to other relevant forums.

compu_85:
You need to adjust the pots a little bit more. You're getting closer.

ried:
Well, after adjusting the trimpots with both the original motherboard and a replacement, I have restored full movement to the head servo.

https://www.youtube.com/watch?v=R3ktz9bICaE

That said, there seem to be several other trimpot adjustments that I likely threw out of spec during the effort, so it's still generating an Error 81 upon boot. I've tried both exercising the disk and a low-level format through BLU and NeoWideEx, adjusting the trimpots further, then trying again. Rinse and repeat. Those attempts have all failed with the disk remaining unresponsive.

It seems that any further adjustments will need to be made by someone with an oscilloscope (and the skills to use it) in order to bring all of the variables into spec. Even then, a working Widget is not guaranteed. I was hoping that my own manual adjustment would be enough, but alas I am not the Widget Whisperer... this time.

Thanks for all the kind advice, everyone. Greatly appreciated.

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