User's Manual

TX RX Systems Inc. Manual 7-9485-1.9.1 10/26/17 Page 14
where they are distributed to the uplink input port of
both the 700 and 800 MHz channel modules.
Downlink input signals (764 - 776 and 851 - 869)
are picked up by the Donor antenna and applied to
the triplexer. The downlink input signals pass
through the triplexer and exit at either the 700 or
800 MHz output port. The 700 and 800 MHz down-
link inputs signals are then applied to the downlink
inputs of the respective 700 and 800 MHz channel
modules.
Channel Module
The uplink input signals and the downlink input sig-
nals are applied to a down-converter board when
they enter the channel module. Within the channel
module input signals are down converted, digitized,
and DSP filtering is performed. There are two
Location Label
Possible
States
Causes
Action
to take
Bottom of channel module DL/UL PWR Green solid FPGA successfully loaded None
Bottom of channel module DL/UL PWR Off Issue with board Return to factory
Bottom of channel module DL/UL COM Red flashes
Exchanging data with con-
trol board
None
Bottom of channel module DL/UL COM Red solid
Exchanging data with con-
trol board
None
Bottom of channel module DL/UL COM Off No data exchanging None
Bottom of channel module DL/UL COM
Always Off and it
is expected to
flash
No data exchanging
Check cabling; return con-
trol board to factory
Bottom of channel module DL/UL DAC Red solid DAC overflow Lower output power setting
Bottom of channel module DL/UL DAC Off DAC normal operation None
Bottom of channel module DL/UL ADC Red solid ADC overflow
Increase down converter
attenuation
Bottom of channel module DL/UL ADC Off ADC normal operation None
Control board Ctrl LED Off
no power, no bootloader,
no program
Return to factory
Control board Ctrl LED Orange
bootloader installed, no
program
return to factory or perform
field update
Control board Ctrl LED Red
Control board detected a
fault
Address fault condition.
Contact factory
Control board Ctrl LED Green solid
Control board normal oper-
ation
None
Power Amplifier PWR Green solid
6 VDC supply to Amplifier
is OK
None
Power Amplifier PWR Off No supply voltage
check power supply and
cabling
Power Amplifier PA OFF Off
Power Amp normal opera-
tion
None
Power Amplifier PA OFF Red solid Over current, over temp
Amp shut down, contact
factory
Table 3: Subassembly LED descriptions.