Chapter 6. Theory of Operation
EK–MOL80–SV. B01
6–7
Power Supplies
There are two power supplies, both autoranging.
One su5 volts at 15 amperes and +12 volts at 10 amperes. This supply
powers the drives and the autochanger logic. The other supply pr24 volts
at 5 amperes. This supply powers the motors.
Figure 6–4 Power Supplies and Power-on Sequence
Line power is connected through the power distribution PCA in the interface (or
LAN module) enclosure. Connection is direct to the 24-volt power supply.
When the 24-volt power supply comes up and is good, AND if the power standby
switch on the right side of the jukebox is in the ON position, the output of the 24-
volt power supply is enabled. The 24-volt output closes the relay on the power
distribution PCA, allowing line power to be applied to the 5/12-volt power
supply for the jukebox (and the LAN-connect power supply, depending on the
model).
The 24V power supply is equipped with a fan-detect circuit that turns the supply
off if the fans over the drives stop operating.
SCSI Repeater/Converter/LUN PCA – 4X Versions
Internally, the jukebox has a single-ended SCSI bus. Through a repeater/con-
verter PCA, it can connect to either a single-ended or a differential external bus.
See the following diagram:
