classiccmp todo/idea list
ard at p850ug1.demon.co.uk
Fri Jun 9 18:45:37 CDT 2006
> "Jay West" <jwest at classiccmp.org> wrote:
> > If you've got one in front of you, why do you need pictures of the inside?
> to answer questions like: does this bracket do this way or that way?
> also was that placed like that on purpose?
> Some machines (esp old ones) have been modified and you may want to
> bring it back to its nominal state (esp if you are investigating
> some strange behaviour).
> Another example is the 9825A where a flat cable does not follow
> the convention that the red stripe should be near side of the
> connector with the little triangle. On a machine with voltages
> ranging from -20 to +20 you'd better plug in stuff the right way.
For the 9825, don't you have 'my' schemaitcs? Although I don't spend time
drawing out straight-through IDC ribbon cables :-). I would include all
the connectors on the PCBs, and I should have put arrows on them
indicating the orientation (top, rear, left, etc) with the PCB in the
normal operating positon. If you match up a few signals on the conenctors
on the PCBs you're linking, you should be able to work out how the cable
should be connected.
> Having said that, I usually take pictures of the machine as I take
> it apart to make sure I can go back and check things. In the case
> of the 9825A I assumed that having the service manual (original with
> readable photos) would be sufficient. False! I had to check the location
IIRC, there's only one useful thing in the 9825 service manual, and
that's a schematic od the printer test fixture (!). Very few other
schematics (the PSU is there, that's it), but they included a schematic
of the one part that's not inside the machine. Great if you need to make
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