Ethernet2 doesn’t work, drops ping packets
NOT OK
Change faulty connector J13
and Gigabyt Ethernet PHY
U19
Check termination resistance between Tx
and Rx in the connector J13. The
resistance should be 150Ohm +/-2%
Check voltage drop on D9, D11 pin#1
and ground. It should be in the range
from 0.3V to 0.4V measured in diode
mode (hold “positive” wire on the ground
and “COM” wire to D9 pin#1)
Change faulty diode array
D9, D11
NOT OK
O
K
Check ferrite beads FB6, FB7.
Ferrite resistance should be less
than 1 Ohm
NOT OK
O
K
Check 25MHz clock on crystal Y5 pins
NO 25MHz
OK
Change faulty ferrite
beads FB6, FB7
Change faulty
crystal Y5
Change faulty Gigabit
Ethernet PHY U19
O
K
The board is unrepairable
Problem still appears
Summary of Contents for RB800r2v5
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