Maintenance and fault finding
86 Block Up Converter Systems 6700/6900 series User Guide
Figure 15: Main BUC fault diagnosis chart
Main BUC fault
diagnosis chart
See BUC fault
diagnosis chart 1.
Is the
PWR LED on the
BUC green?
Is the
FLT LED on the
BUC constant
red?*
* The FLT LED on earlier-
version BUCs may flash red
to indicate the presence of
latched faults. Latched faults
are reset using the RLF
command.
Is the
Tx LED on the
BUC yellow?
See BUC fault
diagnosis chart 2.
See BUC fault
diagnosis chart 6.
See BUC fault
diagnosis chart 7.
No
Yes
Yes
No
Yes
No