Service manual
Service Manual
Creating a test SCSI hard disc
To avoid overwriting the customer's hard disc during
testing, prepare a test hard disc as follows:
Equipment required
• SCSI Hard disc to be initialised(UUT)
• A500 series test station (do not use a customer's
computer for this test)
• 3.5" Winchester initialiser test disc (0286,822) (write
protected)
• Standard RGB colour monitor (Analogue RGB) and
cable.
NOTE: The A500 series test station comprises an A500
series computer with the hard disc drive removed and a
keyboard attached. Plug the unit under test into the
SCSI port of the test station.
Setup procedure
1 Connect the test station and the monitor to the mains
supply. Do NOT turn on.
2 Insert the test disc into the floppy disc drive.
Test procedure
Notes:
1 Throughout the test procedure the power shall be the
last connection made before a test commences, and
the first connection removed when a test is complete.
2 The mains supply voltage must be within the rated
voltage range as indicated on the PSU input label.
3 If a message is expected and has not appeared
within
30 seconds record the fault, the machine needs
repairing. If a failed message appears, record the fault,
and continue the test (as far as possible), then repair.
4 If the test equipment fails 3 consecutive UUT's for the
same fault it shall be subject to a validation test using
a known good UUT and repaired as necessary before
testing continues.
Power-up procedure
1 Insert the UUT into the test station, taking care to plug
the two cables in correctly. Replace the A500's top
cover.
2 Turn on the monitor.
3 Turn on the test station whilst holding down the Delete
key (until the appearance of a red border area on the
screen).
The test station should display the desktop.
4 Press the Break key whilst holding down the Shift key,
and then release the Shift key.
The screen should now display the following:
SCSI Initialiser V x.xx PRO 0
Device identifies itself as a
5 The hard disc manufacturer's name, model number,
and firmware version number will then be displayed.
6 You will then get the following prompt:
Do you
want to format device 0?
7 Type
Y.
This will destroy all data on the hard disc
while formatting it. The UUT will then be formatted, a
disc shape check performed, verified and sectioned.
8 A test is then performed to check the formatted capacity
against the expected capacity. The disc capacity check
verifies that the capacity is within 10% of the expected
capacity.
If the UUT passes all these tests the
PASSED
message will be displayed prior to the
TEST
COMPLETE
message.
A successful test display should look something like the
following:
SCSI Initialiser V x.xx PRO 0
Device identifies itself as a Connor
CP3100-100mb-3.50A15
WARNING
Formatting will destroy all data on
this device
Do you want to format drive 0? YES
Formatting Complete
Reading new disc shape....done
Verifyied O.K.
Writing RISC OS partition....done
Formatted Capacity is 104Mbytes
Drive Size Passed
TEST COMPLETE
Switch off the test station.
After the test
1 Turn all the mains supplies to the equipment off.
2 Disconnect the UUT, from all associated equipment, in
reverse order to that detailed earlier in the Power up
procedure section.
If any fail messages have occurred, the UUT must be
sent for repair and retested.
The hard disc is now ready to be inserted in the customer'
s computer for testing of the computer system.
Maintenance
Inspect and replace all mechanical parts whenever
necessary.
Preparing to run the tests
The start-up menus are used to select a test data file.
These test data files contain strings that represent tests
that can be performed on a system. When you select a
data file, the strings are interpreted, and the CMOS RAM
is set up to contain this test information. Each test
program then reads the CMOS RAM to determine the test
type and which of its tests are to be executed. The test
program then writes its results to the CMOS RAM. At the
end of the test sequence, a program
(reports)
will
read the CMOS RAM and display the test results.
Part 4 - Fault diagnosis Issue 2, June 1991 4-5