User Manual

AS4000 Central Terminal
Installation and Commissioning
Appendix
605-0000-452
2
Issue 1.3dr Date 7/02/00
Page 2 of 2
Shelf 1
ON ON
Shelf 2
OFF ON
Shelf 3
ON OFF
Shelf 4
OFF OFF
If the above are correct check the PA's output by measuring the voltages on the Combiner
Monitor monitor points. The 5 monitor points shown in the table below.
PA1 Shelf 3 PA output.
PA2 Shelf 2 PA output.
PA3 Shelf 1 PA output.
PA4 Shelf 4 PA output.
GND
Connect a voltmeter between the appropriate monitor point and GND read the voltage. The
range is between 1 and 4 volts depending on how many users are enabled.The approximate
values are shown in the table below.
Volts Number of Users
1.16 2 users
1.95 4 users
2.88 6 users
3.08 8 users
3.4 10 users
3.6 12 users
i.e. For Shelf 1 connect the voltmeter between GND and monitor point labeled PA 3. This
voltage changes when the Tx output is increased / decreased using Sitespan. If the voltage does
not change measure the other 3 monitor points to see if they change. If other monitor points
change then:
a) The PA may be an earlier 3.4-3.6GHz-band PA The monitor points will be as described
below.
If this is the case do not enable PCL (remove the monitor card or fit the 3.4-3.6GHz-band CBM
F/W 696-3000-268 rev B)
PA1 Shelf 4
PA2 Shelf 1
PA3 Shelf 2
PA4 Shelf 3
GND
b) The PA may be faulty. In this case return the faulty PA using the Material Return and Repair
procedure 605-0000-435