Maintenance and fault finding
Block Up Converter Systems 6700/6900 series User Guide 97
Test procedures
Use the following tests in conjunction with the fault finding
diagnosis charts.
Table 19: Test A
Procedure Comment
Measure the DC voltage at both ends of
the transmit IF cable.
Connect positive to the centre pin and
negative to ground (to the screen).
For +24 V BUCs, the DC voltage should
be +19 to +35 V DC.
For +48 V BUCs, the DC voltage should
be +42 to +60 V DC.
Table 20: Test B
Procedure Comment
Measure the voltage on the connector
that plugs into the BUC.
For AC-powered BUCs, the measured
AC mains voltage must be between 94
and 275 V AC.
For DC-powered BUCs, the measured
voltage range should be as stated in
Test A (Table 19 on page 97).
WARNING
Care needs to be taken
when performing this
measurement as a severe
electric shock and
personal injury may result.
For pinouts of the AC INPUT connector
see Table 8 on page 31.
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