HP 22A, 83620A, 24A manual How to Clean the Fan Filter, Removing the Fan Filter Specifications

How to Clean the Fan Filter

Note

The cooling fan located on the rear panel has a thin foam filter. How often the filter must be cleaned depends on the environment in which the synthesizer operates. As the filter collects dust, the fan speed increases to maintain airflow (as the fan speed increases, so does the fan noise). If the filter continues to collect dust after the fan reaches maximum speed, airflow is reduced and the synthesizer’s internal temperature increases. If the internal temperature reaches 90°C the synthesizer will automatically turn off and the amber STANDBY LED will turn on. Clean the fan filter as follows:

1.Turn off the synthesizer.

2.Remove the ac line cord.

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, filter, and the filter retainer in warm water, then dry.

6.Reverse the removal procedure to reassemble the synthesizer.

FAN CAGE SCREWS

Figure 4-2. Removing the Fan Filter

Specifications Operator’s Check/Routine Maintenance 4-5