A fan-and-power-supply assembly has the following lights and switch:
AC PWR light
1
The AC PWR light, which is green, comes on when the mainline power
supply is connected to the fan-and-power-supply assembly.
DC PWR light
2
The DC PWR light, which is green, comes on when this
fan-and-power-supply assembly is supplying power to the 2104.
CHK light
3
The CHK light, which is amber, indicates either that there is a failure in the
fan-and-power-supply assembly or that the DC On/Standby switch is set
to Standby.
Note:
This light flashes when the failure in the fan-and-power-supply
assembly is a fan failure.
DC On/Standby switch
4
The DC On/Standby switch connects dc electrical power from the
fan-and-power-supply assembly to the disk drives and other components
in the 2104. This switch must be set to on for the fan-and-power-supply
unit to start.
If the DC On/Standby switch on either of the two fan-and-power-supply
assemblies is set to on, power in a 2104 Model DU3 or TU3 unit is
switched on automatically if all of the following conditions exist:
v
Input power to the 2104 is present.
v
The fan-and-power-supply assembly is fully home in its slot.
v
Either
the power control switch on the switch card is set to on,
or
terminator power is active in an external SCSI connection.
Figure 8. Fan-and-Power-Supply Assembly Lights and Switch
10
2104 Models DU3 and TU3 Operator’s Guide
Summary of Contents for TU3 2104
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Page 91: ...6 Tighten the thumbscrew Figure 67 Tightening the Thumbscrew Chapter 3 Exchanging FRUs 75...
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