Maintenance and fault finding
Block Up Converter Systems 6700/6900 series User Guide 85
Finding faults in the BUC system
The fault finding information provided in this section is
designed to locate faulty modules and cables, and to determine
if correct operating procedures have been followed. Faults are
indicated by the LEDs on the BUC (see Table 11 on page 59).
If a fault is indicated on the BUC it is recommended that you
check the cables and the cable connections.
Using the BUC fault diagnosis charts
The tests indicated in the diagnosis charts are at the end of this
section. When an ‘*’ appears in a diagnosis chart, it indicates
that you are to refer to the relevant test.
You should be able to locate simple faults with minimal test
equipment. A terminal or a computer emulating a terminal is
required for checking the BUC. The most effective technique
when dealing with complex faults, or if a terminal is not
available, is to substitute modules.
You can commence fault finding using the:
• Main BUC fault diagnosis chart (Figure 15 on page 86)
• LNB fault diagnosis chart (Figure 25 on page 96)
CAUTION
During fault finding or performance testing,
disconnect the transmit IF signal and/or
terminate the BUC output into a suitably-rated
dummy load. This ensures that unwanted
signals are not transmitted.
NOTE
The following flow charts assume the BUC is in
non-redundant mode. If the BUC is set to either
of the two redundancy modes and is not
installed in a redundancy system, LNB and
redundancy controller faults are permanently
indicated and cannot be cleared.
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