It is a very good idea to remove the power cord before disassembling the
Lisa as it's always turned on even when it looks off.
Assuming you're facing the back of the Lisa and have turned the two
metal knobs and removed the back cover, the board on the bottom is
called the mother board. To the right, you'll see the power supply
module along with the brightness and vertical (I think) controls.
The motherboard, along with all the cards it contains, just slides out
forward twoards you. Once it's out, there are 3 or 4 boards inside it
on the right hand side. The I/O board is the one directly facing you,
the CPU board is next, followed by one or two memory cards. They have
clips at the top at the left and right, which you can undo on to take
the card out by pulling them upwards. The clips are color coded on one
side and there are matching marks on the card cage to let you know what
card goes into which slot.
On the left side, there are three expansion slots which could contain
various I/O cards - most commonly a dual parallel card, though other
devices have been known to exist, such as a 4 port serial card, a SCSI
card (compatible only with MacWorks, and so on.) These just slide
forward once you undo the yellow tab at the bottom, I believe you have
to pull and twist the yellow/metal clip thing at the bottom clockwise
(maybe) which opens up the slot enough to let you slide the card out
towards you - not up!
You should not have to remove any screws other than what is necessary to
unlock the motherboard. The Lisa's designed to be user maintainable.
This is what an empty motherboard looks like:
http://lisa.sunder.net/lisa-img/mb1.html and
http://lisa.sunder.net/lisa-img/mb2.html
Here's what the CPU board looks like:
http://lisa.sunder.net/lisa-img/cpu.html
and the I/O board: http://lisa.sunder.net/lisa-img/io.html
If you see a battery pack to the lower left of the I/O board, you should
remove this - just clip the tabs carefully off. This is a great source
of trouble - these NiCAD packs tend to leak, and when they do, they'll
corrode both the I/O board and the motherboard, destroying your Lisa.
These batteries are used to provide backup to the equivalent of the PRAM
settings, however the Lisa will function just fine without them - it
won't be able to keep the date and time, but since the Lisa's clock has
a range from 1980-1995, it's useless anyway.
Justaname wrote:
OK, I have disassembled the cage, but can't see how to remove the CPU
board from the bottom of the cage which now consists of the metal base
only. The dozen or so screws are out and the sides have been removed.
Any suggestions on how to gently remove the board?
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