Epson PF10 problems

[Tony Duell]

> 
> Tony Duell wrote:
> 
> <snippage>
> 
> > I suspect the microocontroller or the RAM. Alas both are SMD (and 
> > therefore a pain to remove), I have spares for neither and no way to get 
> > them.
> > 
> > Any comments, suggestions, or things to check?
> 
> Blow a test program into ROM, and let it walk the memory?
> 
> Try and disassemble the ROM, or run it on an emulator?

Yeah, but those are both more work than desoldering the RAM and testing 
it 'by hand'....

I was wondering if there was a 'gotcha' of the form 'if port <foo> is 
stuck low, then the thing will go crazy waiting for it to go high'. 
Admittedly all the inputs I've checked look to be in the right state.

-tony