Service manual

Service Manual
2 Follow the instructions in the section entitled Preparing
to run the individual expansion card tests on page 4-
15.
3 Select the Ethernet I option.
The test program is then loaded and executed. This test
is only a partial test of the Ethernet card. The partial test
tests the RAM, ROM and the transmit and receive
circuitry when in loopback mode.
When the test has finished, a board passed/failed
message is produced.
Check that all the LEDs on the Ethernet I test feedback
lead are lit:
• The single red LED lit proves that 0 & 12 volts are
present.
• The 5 green LEDs detect the signal returns are in tact.
If the green LEDs are not lit check that there is continuity
along the computers back panel.
You have now completed the Ethernet I expansion card
tests. Follow the instructions in the section entitled
Completing the tests on page 4-6.
Ethernet II Expansion Card
The Ethernet II expansion card test should be carried out
whenever you install, repair or replace an Ethernet II
card.
Note: These instructions assume that both the
expansion card and the backplane have been correctly
installed (with the Ethernet II expansion card installed in
skt 1 podule slot 0).
Connect up the equipment
It is important to connect the equipment to the computer
in the correct order. Connect the
1 keyboard to the front panel connector
2 monochrome monitor to the Mono Video socket or the
analogue RGB monitor to the Analogue RGB socket.
3 monitor to the mains supply (don't switch on yet)
4 computer to the mains supply (don't switch on yet).
Run the test
1 Before running the test ensure that the links on the
Ethernet card are set to the Cheapernet position (
towards the crystal).
The Ethernet test feedback lead should be connected
between the Ethernet socket and the free side of the
link positions.
2 Follow the instructions in the section entitled Preparing
to run the individual expansion card tests on page 4-
15.
3 Select the Ethernet II option.
The test program is then loaded and executed. This test
is only a partial test of the Ethernet card. The partial test
tests the RAM, ROM and the transmit and receive
circuitry when in loopback mode.
When the test has finished a board passed/ failed
message is produced.
Check that all LEDs on the test feedback lead are lit:
• the single red LED lit proves that 0 & 12 volts are
present
• the 5 green LEDs detect the signal returns are in tact.
If the green LEDs are not lit check that there is continuity
along the computers back panel.
You have now completed the Ethernet II expansion card
tests. Follow the instructions in the section entitled
Completing the tests on page 4-6.
4-18 Issue 2, June 1991 Part 4 - Fault diagnosis