Service and maintenance
31
Circuit board layout
The MAC 350 Entour has a large fan on the back of the head. Two types of this fan are installed at the
factory, one with 2 and one with 3 wires. Airflow, cooling effect and noise levels are exactly the same for both
types of fan. On fixtures with the two-wire fan, DIP switch pin
1
on the main PCB must be set to the
ON
position and all the other pins set to
OFF
in normal operation. On fixtures with the three-wire fan, all DIP
switch pins must be set to the
OFF
position in normal operation.
Figure 12: Main PCB and DIP switch