User's Manual Part 5

Is ODU ALM indicator (red) on
the IDU lighted?
YES
NO
YES
Are
both IDU and ODU ALM
indicators (red)
flashing?
Check the IF cable connection and
connectors whether the cable is
open or short circuit.
Connect the LCT to the IDU and
check ALARM STATUS menu.
Check every items whether
indicated status is Alarm or Normal.
Is
RX Level
indicated Normal?
Is RXLEVEL by
RSL monitor vary at random
interval?
Are
frequency value at
opposite site and local
site correct?
NO
NO
YES
Check fading or
interference.
YES
Is
IDU ALM indicator (red)
lighted?
YES
YES
Is
APC of the ODU is indicated
Normal?
Is
ODU CPU is indicated
Normal?
Reset CPU of the ODU
Is
ODU ALM is indicated
Normal?
Replace the ODU
with a spare.
End
YES
NO
NO
YES
NO
Check Antenna system or
Replace the ODU with a spare.
Set proper frequency.
NO
YES
Is
ODU TX section are
checked?
YES
NO
NO
Check the TX
section of the ODU.
Check the ODU
TX section.
For XPIC
CORRECTIVE MAINTENANCE ROI-S05751
5-22
Fig. 5-4 ODU RX Section Troubleshooting Flowchart