Codan 6725-W/E-AC/EX-CE - Figure 20: BUC Fault Diagnosis Chart 5

Maintenance and fault finding
Block Up Converter Systems 6700/6900 series User Guide 91
Figure 20: BUC fault diagnosis chart 5
BUC fault
diagnosis chart 5
Is LO
OK?
Reset BUC using RST
command. Reset
latched faults using
RLF command.
Does BUC
have an internal
10 MHz
reference?
Check for 10 MHz at
both ends of the Tx IF
cable (Test C)*.
OK?
Is
FLT LED red and
LO showing a
fault?
* Refer to test
procedures
Reset latched faults
using RLF command.
Monitor for recurrence
of fault.
BUC faulty.
Refer to Codan.
BUC faulty.
Refer to Codan.
Modem, external
10 MHz reference
source, or cable faulty.
Replace as required.
BUC OK.
Monitor for recurrence
of fault.
Yes
No
Yes
No
No
Yes
Yes
No