IDE CDROM questions for TF536 with A2000.

[part12studios]

https://www.youtube.com/watch?v=6jz_UrKJKxM this was a nice video.. but there's also this video showing a shortcut (basically leaving the old fuse) which i see is pragmatic but i must say i kinda prefer doing the full replacement..  will have to check with my guy. https://www.youtube.com/watch?v=syDCZh7U_XM

[part12studios]

if the CIA chip were bad could this cause no 5v?  I'm trying to pre-diagnose the issue before I take it to my guy who's not an amiga technician, but knows his way around a computer for sure, just makes the work quicker / more effective.. 

logic probe?  oh i see, i've never seen one of those before, just googled.  interesting.  I'll have to look into getting one of these.  I figured one of the pins has a constant +5 volt on it standard.. like pin 1 or something.. i just didn't want to start poking around with metal while on.. and zorch something..

So it's possible that a passive mouse like a ball mouse might actually work? 

[part12studios]

which pin is pin 7?  thanks for that link!  definitely good but i'm no good at reading diagrams at least in relation to how they read looking at the db9 is it:

1  2  3  4  5
  6  7  8  9

?

[part12studios]

awesome yea made the most sense but maybe it could have been say:

1  3  5  7  9
  2  4  6  8

Thanks for confirming.  I'll be taking it apart soon.  My downstairs area has been a mess and recent family activities kept me from cleaning things for the A2000 to have a responsible work area..  but I'll open it up asap to get some readings.