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18 AP2500 Hardware Reference Guide
II. Components
Front Cooling Fan Control Board
The front cooling fans’ main purpose is to cool the hard disk drives. These
fans also have a fan control board like the rear cooling fans. The front cool-
ing fan module consists of a control board, a hard disk drive LED status
board, and two cooling fans. The message LED board mounted in the front
of the cooling fan module consists of five sets of LEDs to represent the
status of up to five hard disk drives. Each set has three LEDs which shows
the power, activity, and status of each hard disk drive.
II. System Components
LED Board Header
(For cable to connect to
fan board)
Hard drive Power LED (Green)
Hard drive Access LED (Yellow)
Hard drive Status LED (Red)
Hard disk drive message board
pin 1
3-pin Fan Header
Gold Finger
Connector to the
SCSI Back plane
Board
LED Board Header
(For cable to connect to
LED board)
Front cooling fan control board
pin 1
Power LED Status LED Description
off off power subsystem OK and ready for hard drive insertion
on off Hard disk drive is OK for operation
on on Hard disk drive failure (*)
on fast flash RAID in rebuilding (*)
on slow flash Hot-spare hard disk drive (*)
fast flash on Hard disk drive power failure/short circuit
fast flash fast flash Fan failure
Message LED Description
* Must be provided by RAID controller’s SAF-TE function.