User Manual Part 1

TROUBLESHOOTING
MM101271V1 R2A 69
9.4.3.9 ETHERNET TEST
Procedure:
Execute FactoryTest test 5, subtests 1 and 2.
Troubleshooting information:
The FEC is the 10/100 Base-T Ethernet port originating in the 860 MII port which
interfaces to Network PHY device U5. U5 drives transformer T1 which drives off the
board to Ethernet Port 0. Tx+ and Tx- are on pins J7-A2 and J7-A3. Rx+ and Rx- are on
pins J7-A5 and J7-A6.
SCC1 is the 10 Base-T Ethernet port originating in the 860 SCC1 port which interfaces to
Network PHY device U12. U12 drives transformer T2, which drives off the board to
Ethernet Port 1. Tx+ and Tx- are on pins J7-A8 and J7-A9. Rx+ and Rx- are on pins J7-
A11 and J7-A12.
Three tests are run on each Ethernet port.
The first test performs a loopback test entirely inside the 860 processor. It should never
fail.
The second test performs a loopback test inside the PHY chip. Failure indicates a
problem with the PHY chip or the connections from the 860 to the PHY.
The third test performs an external loopback test with the TX (+ and -) looped back to
RX (+ and -) using a loopback plug on the rear of the shelf. These connections must be
very short. If the first 2 tests pass, failure indicates problems with the transformer or the
connections from the PHY to the transformer, or the loopback plug.
9.4.3.10 LED TEST
Procedure:
Execute FactoryTest test 6.
Troubleshooting information:
I2C bus may be shorted. Check that SDA and SDL are normally 5V and bursts of data
and clock are seen when the test is run. Clock and data should show no appreciable rise
or fall times at a sweep rate of 100us per division. If other I2C devices are working, then
U15 is indicated.
9.4.3.11 DIPSWITCH TEST
Procedure:
Execute FactoryTest test 7.
Troubleshooting information:
If other I2C devices are working, then U26 is indicated, possibly pullup resistor pack
RN12 or bad switch S2.