Service manual
Removing the backplane
Note that the backplane is only fitted on models with a
hard disc drive.
The backplane (item 9) sits inside the main unit, attached
to the main PCB and the backplane/drive tray (item 25).
1 Remove the four fixing screws from the backplane.
2 Remove the backplane from the main board connector
SK9 by pulling the backplane upwards.
Removing cables
1 Disconnect the following cables from the main PCB
which sits inside the main unit:
• the six power connections to the PCB, PL2 to PL7
• the speaker connection LK8
• the LED connection LK22
• the floppy disc drive data cable connection PL10
• the hard disc drive data cable connection PL9 If the
computer does not have a hard drive, ignore the above
reference to the hard disc data cable.
Removing the main PCB
1 Some models of the A5000 have two fixing screws
which attach the PCB to the base metal work. One
screw is located near SK3, the other can be found near
SK8. Remove these screws from the PCB.
2 The rear panel of the computer is attached to the PCB.
Unscrew the two fixing screws on this panel. Note that
some models of the computer have an EMC gasket
sandwiched between the rear panel and the PCB.
3 Unscrew the two fixing screws on the lower blanking
panel and remove this panel, together with the gasket
shield (item 26). It is easier to slide out the PCB once
you have removed this panel.
4 The main PCB is positioned within four side slide
guides (item 5), two at each side. To extract the PCB
assembly, lift the rear panel slightly and slide the PCB
out along the slide guides towards the rear of the main
unit and out through the rear panel opening. Take care
not to damage the gasket fingers that are attached to
the rear panel on some models of the A5000.
Note: Observe all anti-static precautions when storing
the PCB.
Removing the disc drives
If your computer does not have a hard disc drive, ignore
all references to this item.
1 Remove the power connection from the hard disc drive (
item 78) which runs to the PSU (item 12).
2 Remove the power connection from the floppy disc
drive (item 77) which runs to the PSU.
3 Remove the W-shaped EMC spring clip (which earths
the floppy drive to the main case) by pressing down
and hooking it out. See the diagram below.
4 Undo the fixing screw which holds the backplane/drive
support tray (item 25), as shown in the following
diagram.
2-2 Issue 1, November 1991 Part 2 - Disassembly and assembly