Fig. 35 shows a front view of the hushbox.
Since the cooling system has been modified by fitting larger fans than the
original ones but in a much lower position, we thought it was safer to monitor
the temperature of the electronics. The video processing boards are higher up
and since heat from the tubes tends to rise it was thought to fit a temperature
probe with a digital indicator (See Fig. 36).
Fig. 37 shows the position of the probe (on one side of the electronics).
The projector was run for more than 1 hour and it started off with a
temperature of 23.1° C (See Fig. 38). After 1 hour or so the temperature
registered by the probe was 30.6° C (See Fig. 39). Which means that the
temperature above the cooling flow of air stabilises around 8° C higher than
starting temperature. It was also found that the temperature oscillated around
31° C, being the probe, most probably, very sensible to temperature variations.
The display is so small that it was found convenient to make a small
aluminium stand: fortunately the cable is so long that you can locate the
display virtually anywhere 2 meters away from the projector. The probe has been
fixed using a bolt that holds the standard projector enclosure.
Another problem of having a hushbox is that it is not possible to access the
control panel. In case some of the function are not available on the remote
control, it is necessary to have the local panel accessible. It was fixed on the
side of the projector using the same material (aluminium) for the digital
display of the temperature probe (See Fig. 40).
There is a small slot (approx. 1.5 mm deep) around the side of the local
control panel that can be used to slide the control panel in a couple of rails
cut from an aluminium sheet. In this case the new structure of the local panel
was bent higher up in order to be accessible through a large slot cut out from
the hushbox (See Fig. 41).
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