Symptoms of this machine for LINK lights do not light up, the power light, the admin interface cannot connect to machine.

Teardown and quiescent current regulated power supply test 0.2A, not normal. Using oscilloscope to view the Crystal does not start oscillating.

After replacing the 25MHz Crystal LINK lights up, current up to 0.3A. Power supply testing, network.

Installed after tests found a network packet loss is serious. Recheck found is 5V power supply ripple large, double check, and secondary filter capacitor power supply has a slight bulge. Replacement fault completely ruled out.