Product data
Fan-and-Power-Supply Assemblies
Notes:
1. Unless you have a particular reason to do so, do not switch off the using system or
the 2104 when removing or installing power supply assemblies.
2. The diagrams in these instructions show a 2104 Model DU3. The procedure for a
2104 Model TU3 is the same, except that everything is turned through 90 degrees.
3. A fan-and-power-supply assembly can be installed in either position at the back of
the 2104. You can easily distinguish it from a fan assembly, because it has a DC
On/Standby switch and a power connector.
4. The CHK light is valid only when the DC On/Standby switch is set to On. The light
is always on when the DC On/Standby switch is set to Standby.
5. If you are exchanging the fan-and-power-supply assembly of a unit that has one
fan-and-power-supply assembly and a fan assembly, do the following:
a. Remove the fan assembly (see “Fan Assembly” on page 94).
b. Install the replacement fan-and-power-supply assembly into the slot that
contained the fan assembly.
c. Remove the failing fan-and-power-supply assembly.
d. Install the fan assembly into the slot that contained the failing
fan-and-power-supply assembly.
Chapter 3. Removal and Replacement Procedures 89