R&S 4200 Series Operating Manual page 177

Troubleshooting
Code Message
0323 PA POWER LOW
–3 DB
0324 PA POWER HIGH
+1 DB
0325 PA POWER
REDUCED DC
0326 PA PWR
REDUCED VSWR
0327 PA PWR
REDUCED TEMP
0328 PWR REDUCED PSU
TEMP
Level Config
W N Output power
decreases by 3 dB.
E – Output power increases
Transmitter is switched
W – Output power was
reduced due to DC
voltage warning on the
W – Output power was
reduced due to VSWR
VSWR is above 2.
W – Output power was
reduced due to
temperature warning on
the PA board.
This behavior is normal
with continuous
operation and +55 °C
ambient temperature.
W – Output power was
reduced due to
temperature of PSU
board warning.
This behaviour is
normal with extreme
ambient temperature,
115 V AC supply and
transmission.
4.11
Note
Check temperature (see
chapter 3.4.7.4.4)
Check VSWR (see
chapter 3.4.7.4.1)
Check DC voltage (see
chapter 3.4.7.4.3).
See CBIT messages
If this fails to eliminate
the fault, send radio to
Send the radio to service.
by 1 dB.
off.
Check supply voltage
(see chapter 3.4.7.4.3).
If this fails to eliminate
PA board.
the fault, send radio to
Switch off and check
antenna cabling. Switch
warning. on the transmitter again
in order to check VSWR
(see chapter 3.4.7.4.1)
If this fails to eliminate
the fault, send radio to
Check airflow of fans and
ambient temperature.
Clear the ventilation
Check the antenna, and
measure VSWR (see
chapter 3.4.7.4.1). A high
VSWR may cause a
heavy power loss in the
Check airflow of fans and
ambient temperature.
Clear the ventilation
If this fails to eliminate
the fault, send radio to
continuous
R&S XU 4200
Action
0325 to 0328.
service.
service.
service.
opening.
transmitter.
opening.
service.
6166.5368.02.01