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A typically grubby Acorn BBC Master 128
ready for a bit of restoration.
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First of all, on the underside remove the 4 screws marked "Fix".
The 2 from the rear will be longer than the 2 from the front.
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Turn the assembly over again and lift off the lid to reveal a filthy
interior. Undo and remove the 4 screws which hold the keyboard in
place. Followed by the Ribbon cables and lift clear.
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With the keyboard removed access is superb.
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Lift up the ROM cartridge carrier to remove from the mainboard,
unplug the speaker cable and lift the assembly clear. Also remove all power
connections to mainboard, noting where they go.
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Remove the 4 screws at either end of ROM cart sockets, followed
by 1 where backplane attatches to power supply. Then lift upwards at the
rear and pull mainboard backwards out of the case.
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The power supply is removed by unscrewing the 3 screws on the underside
of the unit.
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The power supply can now be lifted clear along with the battery
pack.
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Next using only a damp cloth, clean the interior.
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The ROM cartridge assembly will be particularly filthy as dirt
just falls into it through the top flaps.
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Use the same cleaning technique for the interior of the "lid" section.
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For the Exterior of the lid. First remove the function key-strip,
by sliding upwards then pulling on the centre until "one" end pops out,
then lift away.
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Not a good photograph, but it can be clearly seen on the "right"
of the image what result can be achieved with a little water and scrubbing
with an "old" toothbrush.
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To clean the Mainboard, use an artist soft paintbrush and a vacuum
cleaner hose to loosen and remove the dirt/dust. Mainboards clean up surprisingly
well using this technique.
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Next the Keyboard. Remove all the keys by gripping hold and pulling
upwards away from the keyboard. Not for the feint hearted, all sorts of
grime will be found here.
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With all the keys removed, use the same technique as the Mainboard.
A brush and vacuum hose. The results are noticable on the right of the
image.
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Wash each individual key with a damp cloth only. The dry with a
clean cloth. This image shows the results easily obtained. Its tedious
work with this many keys but well worth it.
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What did I tell you? Look at the image and see how that work has
paid off! The keyboard looks near mint again. Nothing worse than typing
on a filthy keyboard, like using a dirty payphone.
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Here we have all the cleaned components laid out ready for re-assembly.
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First refit the power supply(3 screws) followed by the mainboard(5
screws 1 clip). Next reconnect the power leads to the Mainboard EXACTLY
how they came off.
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Next re-attatch the speaker cable and locate and install the ROM
cartridge unit.
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Re-fit the Battery pack to the left of the keyboard and its connections
to the mainboard. Refit the keyboard (4 screws 1 clip) and attatch the
ribbon cables.
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Re-fit the top of the case using 4 screws(4 long 4 short). Looks
alot better now. Dont forget to re-configure the CMOS as settings will have been lost due to battery disconnection.
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