Codan 6725-W/E-AC/EX-CE - Figure 16: BUC Fault Diagnosis Chart 1

Maintenance and fault finding
Block Up Converter Systems 6700/6900 series User Guide 87
Figure 16: BUC fault diagnosis chart 1
BUC fault
diagnosis chart 1
Is
BUC externally-
powered, or
powered via IF
cable?
Is
IF power supply
being used?
Check for DC power at
both ends of the Tx IF
cable (Test A)*.
OK?
Check voltage on
power connector
(Test B)*.
OK?
OK?
Check for DC power at
the output of the IF
power supply and the
BUC end of the Tx IF
cable (Test A)*.
* Refer to test
procedures
BUC faulty.
Refer to Codan.
Check cable,
AC mains and circuit
breakers.
Modem or cable
faulty. Replace
as required.
Externally
powered
IF cable
No
Yes
No
Yes
No
No
Yes
Yes