Re: opening the 2c brick psu

["Michael J. Mahon" <mjmahon@aol.com>]

phil wrote:
> My 2c psu brick is faulty, and I need to  open it to find the
> problem.the plastic welds are not easy to find. Has anyone else done
> this before?
> Also, as a temporary replacement, I tried a 12v 2a psu. It couldn't
> provide enough voltage pressure,  (i know it's supposed to be 15V) I
> think the high current the machine drew from the 12v psu may have
> blown the fuse on the board. F1, the little green thing. Does anyone
> know the value of the fuse? Thanks.

The //c power brick supplies 15vdc at 1.2A, and the //c itself is
pretty tolerant of voltage.  It will run very nicely from a 12v
battery, for example.

You don't mention whether the 12v power supply you used was regulated,
or what the actual voltage was when the //c was switched on, but if it
can supply 12v under load, it should work.

It think you are correct to suspect some other problem with the //c.
Sometimes fuses blow because of fatigue, and sometimes they blow
because too much current is being drawn.  It's worth finding out
which is the case before risking further damage.

It's also likely that the "brick" can be fixed by replacing an
internal fuse, assuming that the problem was an overload.

-michael

NadaNet networking for Apple II computers!
Home page:  http://members.aol.com/MJMahon/

"The wastebasket is our most important design
tool--and it's seriously underused."