Service manual

Service Manual
9 Switch off the power to the rest of the equipment.
10 Replace the test hard disc if fitted, with the original.
11 Check the refitted hard disc starts up properly –
power up the equipment, click the mouse over the hard
disc icon and ensure a directory viewer appears.
12 Shutdown the unit under test:
• press F12 and type SHUTDOWN (then press Return)
Or
• select Shutdown from the task manager menu.
13 Switch off the power to the computer (at the mains
switch on the rear of the machine).
14 Switch off the mains power to the rest of the
equipment.
Disconnecting the equipment
IMPORTANT
If you have completed service or tests on the system and
are about to move the computer and/or return it to the
user, you MUST do the following BEFORE switching off:
1 Park the hard disc heads (if a hard disc drive is fitted).
2 Load the contents of the CMOS RAM back into the
machine.
Then you can
3 switch off the power to the Archimedes computer (at
the mains switch on the rear of the machine)
4 switch off the power to the rest of the equipment.
It is important to disconnect the equipment from the
computer in the correct order:
1 Disconnect the Archimedes computer from the mains
supply.
2 Disconnect all monitors from the mains supply.
3 Disconnect all other equipment from the mains supply.
4 Disconnect all monitors from the Archimedes
computer.
5 Disconnect the headphones from the headphones
socket.
6 Disconnect the printer from the Parallel Printer port.
7 Disconnect the serial port loopback plug from the
RS423 socket.
8 Disconnect the keyboard from the front panel
connector.
9 Disconnect all other test equipment from the
computer.
Packing
After servicing, repack the computer in its box. To avoid
damage, do NOT send the computer through the post or
by courier unless it is in its original packaging.
Main PCB functional test suite
WARNING: Running the hard disc tests can
destroy data held on the hard disc. Ensure that
customers are aware of this and that they give you
their consent before you start.
Alternatively replace the hard disc with a test hard
disc.
The following is an example of how to test a standard
computer.
Note: Both the replacement of the hard disc and the
check on memory size require the top cover to be
removed from the computer. See the section entitled
Removing the top cover on page 3-1.
Replace the user's hard disc
Ensure the user's hard disc is not overwritten during the
test. Disconnect the fitted hard disc and place it in a safe
place. Connect and secure the test SCSI hard disc into
the computer (see the section entitled Creating a test
SCSI hard disc on page 4-5 for details of creating a test
SCSI hard disc).
Check memory size
You should check the amount of memory that is fitted to
the computer and log the size. Each computer will have
4Mbytes on the main PCB plus another 4 MB on each
memory expansion card, if any are fitted. Reference will
be made to the memory size later.
Connect up the equipment
Connect the equipment in the following order:
1 keyboard to front panel connector
2 serial port loopback plug to the RS232 port
3 printer to the Parallel Printer port
4 headphones to the Headphones 32 Ohm socket
5 high resolution monochrome monitor to the Comp
Sync & Mono Video socket
6 multi-sync analogue RGB monitor to the Analogue
RGB socket
7 monitors to the mains supply (do not switch on yet)
8 computer to the mains supply (do not switch on yet).
Run the tests
1 Make sure you have followed the instructions in the
section entitled Preparing to run the tests on page 4-5.
2 Select option A from the resulting menu to initialise the
CMOS RAM.
Part 4 - Fault diagnosis Issue 2, June 1991 4-7