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3.2 Cooling Fan Speed Adjustment
1. There are two hot-swappable 120×120×25 mm cooling fans for ventilation inside
NA255A. The cooling fans can be drawn out by pulling the L type metal handle on
the fan modules.
2. The front 120×120×25 mm cooling fan speed can be adjusted. Pull out the fan module,
there are four sets of jumpers labeled with 6V, 8V, 10V, 12V from top to bottom on the
fan connector board. The default setting is the jumper being placed over pin 7 and 8 for
label 6V for slowest speed. The speed increases from label 8V to label 12V. As jumper is
not placed over pins, the fan will spin at 12V full speed.
6V
8V
10V
12V
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