RF Troubleshooting Procedures
28
b. If the problem moves to Transmitter B, the
problem is not in Transmitter A (transmitter of
the original bad channel). Proceed to Step 2.
Step 2. Because the problem is not in Transmitter A,
either Receiver A or the frequency itself is faulty.
To isolate between the two, first change the
receiver frequency of Receiver A to the frequency
of the known good channel (Frequency 2). Change
the receiver frequency of Receiver B to the
frequency of the bad channel (Frequency 1).
Observe what happens:
a. If the problem remains with Frequency 1, the
problem is in the frequency. The problem must
be further isolated to determine whether it is
in the antenna system or the RF Signal
environment. Either an
Antenna System
Troubleshooting
procedure or an
RF History
Strip
evaluation must be performed.
b. If the problem moves to Frequency 2, the fault
is in Receiver A. Before replacing the receiver,
check the following:.
— Make certain that the semi-rigid cable is
connected correctly and not damaged. If the
cable is suspected, swap it with one of the
other cables in the mainframe and see if the
problem switches to the other channel. If it
does, replace the cable.
— If the semi-rigid cable is OK, then the
receiver module is probably bad. Exchange
the receiver module with another one to
confirm.
— If the problem follows the receiver, replace
the receiver PCB.
— If the problem remains with the slot,
replace the antenna distribution board in
the receiver mainframe.
quickref.fm Page 28 Wednesday, June 5, 2002 3:08 PM
