3 dc output board, 4 cooling fans, Cooling fans –6 – Crown Audio FM1000A User Manual
Page 30
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4–6
FM1000A User’s Manual
4.2.3 DC Output Board
The DC Output Board is located in the back of the unit directly behind the PFC
Switching Board. This board rectifies and filters the transformer output voltage
once again to produce the clean DC power required for the power modules. The DC
Output Board also provides the 24–volts that operate the cooling fans in both the
PS1000 and the PA1000. There are two parallel paths from the DC Output Board,
with half the power going through each set of output cables. These cables come
together at the terminal in back of the unit providing the maximum output power
of 50 volts at 60 amperes.
4.2.4 Cooling Fans
There are two cooling fans located in the front section of the PS1000. Their pri-
mary function is to cool the semiconductors used in the switching and rectifying
process which are subject to high currents. The fans blow cool air through the
heatsinks and out through the vents on the back and side panels of the PS1000.
The fans have a dedicated circuit breaker located on the back panel of the power
supply.