Fan Maintenance R&S XU 4200
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5.2 Fan Maintenance
Fan Maintenance \Fan Mainte nance "Radio ".doc
Introduction
The main fan of the radio prevents the radio from overheating in case of
high external temperature, or a high VSWR value on the transmitter. The
fan of the PSU (power supply unit) ensures that the power supply does not
overheat. Therefore, the temperature inside the radio is constantly
measured and the rotation speed of the fans is adapted accordingly and
monitored.
Inspecting
the air intake
Inspect the air intake on the front panel for dust build-up and clean it if
necessary. The inspection interval depends on the environmental conditions
under which the transceiver is operated.
Note: Due to the long service life of the fan, no regular maintenance is
required here besides cleaning. The speed of the fan is monitored by
means of the continuous built-in test (CBIT), and a warning is promptly
generated (see chapter 4.2).
Mainten
ance of the
main and PSU fans
If a fan wear
s out, it is recommended to exchange the fan to prevent the
radio from subsequent failure. An indication to replace the fan is the
occurrence of a CBIT warning message. If a “warning” occurs, the radio is
still operational, but the fan must be replaced soon.
If one of the following CBIT messages occur more than once or over a
prolonged period of time, it is recommended to replace the main fan or the
PSU fan as a preventive action.
On the transmitter:
0103 MAIN FAN WARNING, possibly in conjunction with a temperature
warning 0317 PA TEMP WARNING or 0319 TX TEMP WARNING
0201 PSU FAN WARNING, possibly in conjunction with a temperature
warning 0203 PSU TEMP WARNING
On the receiver:
0103 MAIN FAN WARNING, possibly in conjunction with a temperature
warning 0411 RX TEMP WARNING
0201 PSU FAN WARNING, possibly in conjunction with a temperature
warning 0203 PSU TEMP WARNING
Replacement of the fan is described in the service manuals of the radios,
where also the order number for the spare part is listed.
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