How To Clean The Fan Filter - Agilent Technologies 83620A Service Manual

How to Clean the Fan Filter

he cooling fan, located on the rear panel, has a thin foam lter. How often
the lter must be cleaned depends on the environment in which the synthesizer
operates. As the lter collects dust, the fan speed increases to maintain air ow
(as the fan speed increases, so does the fan noise). If the lter continues to
collect dust after the fan reaches maximum speed, air ow is reduced and
the synthesizer's internal temperature increases. If the internal temperature
reaches 90 C, the synthesizer automatically turns o and the amber standby
LED turns on.
WARNING
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.
Clean the fan lter as follows:
1. urn o the synthesizer.
2. Remove the AC line cord.
3. Remove the two screws holding the fan shroud to the rear panel. (See
Figure 10-1.)
4. Separate the fan shroud, the foam, and the honeycomb from the ground hex
shroud.
5. Rinse the foam and honeycomb in warm water, then dry.
6. Reverse the removal procedure to reassemble the synthesizer.
10-2 Preventive Maintenance
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