Operation and Troubleshooting
Chapter 5
512
When you suspect that the interface is not functioning properly, follow
these steps (Figure 5.6).
Figure 5.6
Troubleshooting Flowchart
AC
Step 1
OFF
POWER
ON
Problem
Suspected
HOST
FAULT
MAC
FAULT
DUP
ADDR
IN-RING/
SEEKING
MEM
ON
DC
POWER
ON
Step 2
Press EXIT REQUEST.
Switch to RESET momentarily
and then to RUN.
Step 3
Step 4
Step 5
Step 6
ON
OFF
OFF
OFF
Green
OFF
ON
ON
ON
Yellow
Check:
AC POWER Switch
Fuse
Set the AC power switch to
OFF, wait 20 seconds, then
set the AC power switch to
Replace host board.
Replace MAC board.
Press EXIT REQUEST.
Set unique link address.
Check cabling on Data
Communication on Data
Highway II link OK. Check
cabling to the host device.
ON. If the indicator is still OFF,
try replacing each of the three
AC Power Source
Interlock Switch
Power-Supply Board
boards until you find the
faulted one.
Highway II link.
Troubleshooting the Interface