Comtech EF Data XPA-200 Installation And Operation Manual page 81

XPA200-7984-I-OPT1, X-Band SSPA
SYMPTOM
No remote control
communication.
XPA200-7984-I-0PT1, Rev.2
POSSIBLE CAUSES
"AMPLIFIER = OFF" feature
activated.
Large customer attenuation
values selected.
Input power level not
correct, perhaps due to
faulty input cable.
Faulty input connection from
10V power supplies.
Faulty SSPA control cable or
connection.
Failed SSPA amplifier module.
Incorrect cable connections.
Improper communication
SOLUTIONS
allows for lower current draw
from the prime power source
under standby conditions.
obtain RF output, ensure that
this feature is set to
"AMPLIFIER = ON".
Check the "ATTENUATION = XX"
setting in the
"CONFIGURATION" menu.
value to get more gain.
Use the input sample port on
the front panel to determine
that the input power level is
as expected.
Use the "MONITOR" menu to
check the internal level of
PS1 and PS2. The levels
should be near 10V.
correct, use a voltmeter to
measure the voltage where the
#8 wires enter the amplifier
unit. WITH UNIT OFF, tighten
connections if necessary.
Check the 25 pin ribbon cable
connections at the amplifier
module and at AS/0200.
This can usually be
determined by using the
"MONITOR" menu to check the
DC current levels being drawn
by each transistor inside the
amplifier module.
Any transistor (QX) current
that is 50 percent more or
less than nominal would
probably indicate a failure.
Nominal values:
Q1=20mA, Q2,Q3=1.5A,Q4=2A,
Q5=4A, Q6-Q11=7.5A, Q12-
Q19=9A.
There are no user serviceable
parts inside the amplifier
module. Return to factory
for repair.
Make sure cable is wired as
described in Section 5.
Check settings of SSPA along
Addendum
To
Lower
If not
7.3