103
For models 257/307
Note about built-in fan motor power supply circuit checking:
Must be done with unit power suplly switched off.
Normally fan rotates without resistance.
After having unplugged fan connectors from A3 board, connect a jumper on power line (blue and red wires) as shown below.
Then rotate manually the fan; if fan motor built-in power circuit is OK, a light resistance must be felt. This resistance disappears when jumper is
taken out.
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