Maintenance and fault finding
104 Block Up Converter Systems 6700/6900 series User Guide
Figure 26: RF waveguide switch fault diagnosis chart
RF waveguide switch
fault diagnosis chart
Disconnect cable from switch.
Are the
resistances and tell-back
contacts consistent with
Table 25?
What
colour are the
BUC Switch and
LNB Switch*
LEDs?
* LNB Switch LEDs
are not operational in
transmit-only systems
6586 faulty.
Switch faulty.
Replace switch.
Red
No
Green
Select position 1 by manually
rotating actuator in switch.
Switch faulty.
Replace switch.
Switch fault
resolved.
Are the
resistances and tell-back
contacts consistent with
Table 25?
Select position 2 by manually
rotating actuator in switch.
Reconnect cable to switch.
Disconnect cable from 6586.
Yes
No
Yes
Repeat measurements
at 6586 end of cable.
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