Fans - Digital Equipment MicroVAX 3600 Operation

The controls and indicator lights function as follows:
• DC OK
When the DC OK light is lit, the do voltages are within the
correct operating range. An unlit DC OK light indicates a problem with
the power supply. Turn off the system and call your DIGITAL service
representative.
• Reset button A recessed Reset button enables you to reset the system to
a power-on state without turning it off . The Reset button is recessed to
prevent you from inadvertently resetting the system. Use your fingertip
or small tool to press the button. See Chapter 2 for the correct procedures
for resetting the system.
• Circuit breaker The circuit breaker trips to protect the system from
power surges. When tripped, the circuit breaker is in the out position.
To reset the breaker, press it in.
1.1.1.4 Fans
Two fans located under the card cage draw air through the BA213 enclosure.
The fans draw air from the top of the enclosure, down through the card
cage, and out the bottom. The speed of the fans varies with the ambient
temperature.
Additional fans in the RA82 disk drive unit draw air in through the front
and out the back of the drive. Figure 1-15 shows the air flow throughout
the entire system cabinet with the front door and window closed.
System Overview 1-17