IBM EXP400 Type 1733, Hardware Maintenance Manual And Troubleshooting Manual

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Power-on LED (green)
This green LED is lit when the power supply is turned on and is supplying
both 5 volt and 12 volt dc power to the expansion unit.
General-system-error LED (amber)
When lit, this amber LED indicates that the unit has a fault, such as in a
power supply, ESM, or hard disk drive.
Box identity (blue)
The box identity LED is used to identify the expansion unit. When this blue
LED is lit, the system-management software on the server connected to the
expansion unit has identified this expansion unit.
Bridge card bay
The bridge card is located in the center of the front panel between bay 7
and bay 8.
Filler panel
Expansion units come with drive filler panels in the unused drive bays.
Before installing new hard disk drives, you must remove the filler panels
and save them for later use. Each of the 14 bays must contain either a filler
panel or a hard disk drive.
Drive bays
There are 14 drive bays that contain either a hard disk drive or a filler
panel.
Latch This multipurpose blue latch releases or locks the hard disk drive in place.
Tray handle
You can use this multipurpose handle to insert or remove a hard disk drive.
Status LED (amber)
Each hard disk drive has a status LED. When lit continuously, this amber
LED indicates a drive failure. When flashing, this amber LED indicates that
a drive Identify or Rebuild is in progress.
Activity LED (green)
Each hard disk drive has an activity LED. When flashing, this green LED
indicates drive activity.
Hard disk drive
You can install up to 14 hot-swap hard disk drives in the expansion unit.
Each drive contains an Ultra320 hard disk drive and tray.
Power-on LED (green)
activity
LED (green)
Hard disk
drive
General-system-
error LED (amber)
status
LED (amber)
Hard disk
drive
Drive bays
Tray
handle
Latch
Bridge
card bay
Hard disk
drive
Filler panel
Box identity LED
(blue)
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IBM EXP400 Storage Expansion Unit Type 1733: Hardware Maintenance Manual and Troubleshooting Guide