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46 IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide
4.9.1 Power Supply/Cooling Modules
Danger Do not remove covers from the Power Supply/Cooling (PSU) module. Danger of electric shock
inside. Return the PSU to your supplier for repair.
4.9.1.1 Removing a Power Supply/Cooling Module
ATTENTION Do not remove the faulty Power Supply/Cooling module unless you have a
replacement unit of the correct type ready for insertion.
If a power supply unit or its fan is faulty, you must replace the whole Power Supply/Cooling
module.
As there should always be two power supply units installed, you can continue working while
replacing the faulty module.
1 Make sure you identify the faulty Power Supply/Cooling module correctly, from the two
modules installed.
2 Switch off and disconnect the power supply cord.
3 Squeeze the two latches on the PSU handle together (Figure 4–2) and open the handle to cam
the PSU out of the enclosure (Figure 4–3).
4 Grip the handle and withdraw the PSU (Figure 4–4).
4.9.1.2 Inserting the Module
1 Check for damage, especially to the rear connector on the PSU.
ATTENTION Handle the module carefully and avoid damaging the connector pins. Do not
install the module if any pins appear to be bent.
2 With the PSU handle (Figure 4–3) in the open position, slide the module into the enclosure.
Important Install the Power Supply/Cooling module in the right hand bay (Rear Bay
1) of the enclosure in an “upside down” orientation. If necessary, reorient
the power cord clip so that the power cord can be properly retained.
3 Cam the module home by manually closing the PSU handle (see Figure 4–4). A click should
be heard as the handle latches engage (see Figure 4–2).
4 Connect the power supply cord to the power source and switch the power supply ON.
Note The alarm will sound until the new Power Supply/Cooling module is
operating correctly.