2–6
DECbridge 500/600 Problem Solving
2.4.1
Problem-Solving Tools and Components
The following equipment is used to test the DECbridge 500/600 series:
•
Unattenuated FDDI loopback connector (P/N 12-32005-01) for FDDI multi-
mode port
•
Single mode attenuated loopback connector (P/N 12-34830-01)
•
AUI loopback connector(s) (P/N 12-32005-01)
•
T-connector (P/N 12-25869-01) and terminators (P/N 12-26318-01) for loop-
back on the ThinWire port (not needed for DECbridge 600 series)
•
SDU optical power meter kit (P/N 29-28384-01)
2.4.2
Running the Self-Test Diagnostics
When the self-test diagnostics detect a failure in the bridge (or you suspect a failure),
rerun self-test to verify that the failure can be repeated. You can run self-test locally
by turning ac power to the bridge off for at least 15 seconds, then turning it back on.
2.4.3
Visually Inspecting the Bridge
Before performing in-depth problem-solving procedures such as replacing assem-
blies or removing cables, use the following checklist (and refer to Figure 2–2) to en-
sure that an easily overlooked problem is not causing the faulty operation of the
bridge:
•
Ensure that the power cord is properly connected both at the bridge and at the
ac outlet.
•
Ensure that the appropriate power is available at the ac outlet.
•
Ensure that the circuit breaker (located on the bridge I/O panel) has not
tripped. If it has, press the white button to reset the breaker. If it trips again,
power problems may exist.
•
Ensure that the fans are running (the FAN_BAD indicator should be off). If
they are not, an overtemperature condition may have induced a logic module
failure or a power supply problem.
