Service manual

Service Manual
I/O expansion card test & Midi upgrade
test
The I/O expansion card test should be carried out
whenever you install, repair or replace an I/O expansion
card.
The MIDI Upgrade test should be carried out whenever
you install, repair or replace the MIDI Upgrade for the I/O
expansion card.
Note: These instructions assume that the I/O expansion
card, the MIDI upgrade to the expansion card (if fitted)
and the backplane have already been correctly installed.
Connecting up the equipment
It is important to connect the equipment to the computer
in the correct order. Connect the
• keyboard to the front panel connector
• hi-res monochrome monitor to the Mono and Sync
sockets, or analogue RGB monitor to the Analogue
RGB socket
• Port Tester 1 MHz Bus socket to the computer's 1
MHz Bus socket, using the 34way IDC cable
• Port Tester User Port socket to the User Port socket,
using the 20way IDC cable
• Port Tester A/D Port socket to the Analogue Port
socket, using the 15way IDC D type cable
• MIDI IN socket to the MIDI OUT socket, using the
Econet cable
• monitor to the mains supply (don't switch on yet)
• computer to the mains supply (don't switch on yet).
Run the test
1 Follow the instructions in the section entitled Preparing
to run the individual expansion card tests on page 4-
15.
2 Select the I/O Exp. Card Test option, or the 10 Exp.
Card + Midi Test option.
The display will then clear and the selection will be
displayed.
The test will then run automatically. When the test is
finished, a message is displayed to tell you whether the
expansion card has passed or failed.
You have now completed the I/O expansion card or the
I/O expansion card + MIDI upgrade tests. Follow the
instructions in the section entitled Completing the tests
on page 4-6.
I/O expansion card test
The I/O expansion card test should be carried out
whenever you install, repair or replace an I/O expansion
card.
Note: These instructions assume that the I/O expansion
card and the backplane have already been correctly
installed.
Connect up the equipment
See the section entitled I/O expansion card test & Midi
upgrade test.
Run the test
1 Follow the instructions in the section entitled Preparing
to run the individual expansion card tests on page 4-
15.
2 Select the I/O Exp. Card Test option.
The display will clear and the selection will be displayed.
The test will then run. When the test is finished a
message is displayed to tell you whether the expansion
card has passed or failed.
You have now completed the I/O expansion card tests.
Follow the instructions in the section entitled Completing
the tests on page 4-6.
MIDI expansion card test
The MIDI expansion card test should be carried out
whenever you install, repair or replace a MIDI expansion
card.
Set up the MIDI expansion cards
For this test to function correctly, the MIDI expansion
cards MUST be installed in these positions:
• The MIDI expansion card under test must be in the
upper socket of the backplane, labelled Podule 0.
• The known good MIDI expansion card must be in the
lower socket of the backplane, labelled Podule 2.
It will therefore be necessary to rearrange the expansion
cards in the computer.
Note: Make a record of the positions of any expansion
cards already fitted, so you can replace them in their
correct sockets after you have run the test.
Proceed as follows:
1 Remove the top cover of the computer.
2 Ensure that the backplane and its support bar are fitted
correctly.
3 Remove any expansion card already in the backplane
sockets labelled Podule 0 and Podule 2.
4 Install the known good MIDI expansion card in the
backplane socket labelled Podule 2.
5 Install the MIDI expansion card under test in the
backplane socket labelled Podule 0.
Connect up the equipment
It is important to connect the equipment to the computer
in the correct order. Connect the
• keyboard to the front panel connector
• hi-res monochrome monitor to the Mono and Sync
sockets
Or
analogue RGB monitor to the Analogue RGB socket
4-16 Issue 2, June 1991 Part 4 - Fault diagnosis