How to Clean the Fan
Filter
The co oling fan lo cated on the rear panel has a thin foam lter.
How often the lter must be cleaned depends on the environment
in which the swept signal generator op erates. As the lter collects
dust, the fan sp eed increases to maintain airow (as the fan sp eed
increases, so do es the fan noise). If the lter continues to collect
dust after the fan reaches maximum speed, airow is reduced and
the swept signal generator's internal temperature increases. If the
internal temp erature reaches 90
C the swept signal generator will
automatically turn o and the amber STANDBY LED will turn on.
Clean the fan lter as follows:
1. Turn o the swept signal generator.
2. Remove the ac line cord.
Note
The detachable power cord is the instrument disconnecting device.
It disconnects the mains circuits from the mains supply before other
parts of the instrument. The front panel switch is only a standby
switch and is not a LINE switch.
3. Remove the screws holding the fan cage. See Figure 4-2.
4. Remove the fan cage from the rear panel.
5. Rinse the fan cage, lter, and the lter retainer in w
arm water,
then dry.
6. Reverse the removal pro cedure to reassemble the swept signal
generator.
Figure 4-2. Removing the Fan Filter
Operator's Check/Routine Maintenance 4-5
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