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A typically grubby looking Acorn A4000 Base unit that requires
a service.
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A view of the rear of the unit, showing ports and a Video Digitiser
Podule.
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To remove the top cover, unscrew and remove the two securing screws,
centre left and right.
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This allows the lid to be slid towards the rear and off of the
unit, revealing many years of dust.
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Next remove the Podule securing screws. If no podule is fitted
the you can remove the screws which secure the blanking plate in position.
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Now, CAREFULLY! lever the podule upwards by using pressure ONLY!
where the connectors go into the mainboard, NOT pressure from the rear.
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The drive power cables need to be un-attatched from the chassis,
you can either cut the plastic tie or like me, unpick it for re-use. I
like originality so the original goes back on.
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Disconnect the power connector to the mainboard along with the
Floppy Drive Ribbon and Hard Disk Ribbon cable. Take care as theres not
much room for large hands.
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Pull the power lead out of the rear of the Hard Disk Unit, also
seperate the red/black lead which goes to the Hard Disk Activity LED on
the front panel.
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Undo and remove this single screw which secures the Drive sub-chassis
to main casing.
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The Drive sub-chassis can now be lifted upwards and withdrawn to
the rear of the Unit. Make sure no cables "snag" on anything during removal.
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This image shows the Drive sub-chassis removed from the main base
unit.
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To remove the front panel, unclip the 6 plastic latches. There
are two at each end and two in the centre. Start at one end and pull out
slightly to stop it poping back into position.
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Before totally withdrawing from the Base Unit, disconnect the final
cable from the mainboard, noting its position for correct re-assembly.
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Disconnect the speaker cable then, grip the rear panel, lift upwards
and withdrawl the Mainboard to the rear of the unit, again making sure
no PSU cables "snag" anything on the way out.
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You should now have a relativly empty chassis and mainboard parted
as per image.
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Next on the fron panel, pull off the power switch button, noting
which way up it came off. Then unscrew and remove the two screws that hold
the power switch in place.
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Undo and remove the single retaining screw for the Power Supply
Unit, this can now be withdrawn from the chassis.
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All components laid out and ready for cleaning. Exteriors with
damp cloth and interiors with a paintbrush and vacuum cleaner.
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Individual drives can be removed from the sub-chassis by simply
unclipping the spring clip that holds it in place. Carefully re-seat drives
on location dowel holes and NOT on there electronics.
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The Mainboard after cleaning, just like new.
Finally re-assemble the unit in exact reverse order of the above. This
unit will give many more years service and not look out of place.
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