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This is my Acorn RISC PC. It's a StrongArm 233 with 10Mb of RAM
and 2Mb Video Ram and i-Cubed Network card. It is also in need of a good
clean.
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A view of the rear of the unit showing mainboard ports, power input/output
and blanking plates over the backplane.
To remove the top cover, twist the two securing latches through 90
degrees, then lift the top upwards from the rear.
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A view of the inside. It doesnt look that dirty from this distance,
but wait until we got to some closeups.
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This is the 2-way Backplane riser board. Note all the dirt and
dust thats been ejected from the power supply clogging the board and the
floppy drive behind it.
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To remove the riser board, grip it at both sides and ease it upwards
with slight side to side movement to help free it.
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The same goes for the processor card. Be very careful not to damage
this or the socket. Note which way round it was fitted and which socket.
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Next remove the Data and Power cables to the Floppy Drive and CD-ROM
Drive. Dont forget the Audio cable on the CD-ROM (all highlighted in RED).
Next pull upwards to remove the rear locking pins (BLUE) and twist the
front locking pins through 90 degrees (BLUE) and pull them out.
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The main "slice" of the machine can now be lifted clear of the
base.
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To seperate the Floppy and CD Drive from the main "slice", remove
the highlighted screws, and slide the drives out.
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Next remove the main power plug to the mainboard and speaker/hard
disc activity light wires (RED) noting the way they came off. Then disconnect
the Floppy and Hard Disc data cables from the mainboard followed by the
CD Audio cable, all highlighted in BLUE.
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To remove the Hard Disc. Remove the single screw highlighted in
RED and lift the clip and Hard Disc clear. Also while were here, pull off
the main power button on the front panel, followed by the single screw
which retains the Power Supply Unit to the base. (Not highlighted but next
to where power on button exits from PSU case).
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If a Network card is fitted, first remove the two screws on the
back panel which secure it in place, then grip the "forward" end of the
board and wriggle it upwards to free it from the mainboard.
Next remove the single screw which secures the mainboard to the base.
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The Network card, Power Supply Unit and Mainboard can now be lifted
clear of the base.
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First this to do with the Power Supply Unit is remove all the external
dust with a vacum cleaner hose. Next, unscrew and remove the two screws
highlighted.
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The two halves of the PSU case can now be seperated, NOTE that
to fully seperate the two halves, the fan connector (BLUE) and black and
white lead (RED) must also be disconnected. Vacum out the interior and
fit back together.
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Unclip the lid from the Floppy Disc drive, and using a vacum hose
and small paintbrush, remove all the dust and dirt from inside.
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The mainboard is cleaned using the same technique. When done it
will look just like new.
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Clean the backplane riser card, Network card (if fitted) and Processor
card in the same way.
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To clean the base, first vacum out all the surface dust, then wipe
the entire unit over with a damp cloth followed by a clean dry one. The
same can be done for the main "slice".
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This image shows all the component parts of a RISC PC laid out
ready for re-assembly.
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First, re-fit the mainboard to the base, reconnecting the loudspeaker
and front panel cables. Dont forget the single screw which secures the
mainboard in position.
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Now re-fit the Power Supply Unit, securing it with its single screw
after bushing it fully to the rear of the unit. Re-attatch the power plug
to the mainboard at this stage.
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Re-fit the Hard Disc, and re-connect the ribbon cables for it and
the Floppy drive to the mainboard.
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Re-fit the Network card (if fitted) by locating the connectors
through the rear panel, then pressing the interface onto the mainboard,
and finally securing to the rear panel with two screws.
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Re-assemble the Floppy and CD-Rom drives into the main "slice"
ready for re-fitting to the base.
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Place the main "slice" on top of the base, making sure no cables
are trapped. Re-connect data and power cables to the Floppy and CD-ROM
drive. Also the Audio cable for the CD-ROM.
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Re-fit the small locking pins to the front of the unit, turning
them 90 degrees to lock. Place the rear pins in position, but do not lock
at this time. Re-fit the backplane riser card and Processor card by lining
them up with there respective socket and pushing jently down into place.
Finally refit the top cover and secure with the two rear locking pins.
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A reference shot of this outstanding machine up and running.
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Another shot of the same machine with the Drive access door rolled
down.
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