Acorn A4000 Base Unit

Stripdown Clean and Re-assembly.

Page 1

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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The Drive sub-chassis can now be lifted upwards and withdrawn to the rear of the Unit.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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