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16 IBM Netfinity EXP300 - Type 3531 Hardware Maintenance Manual
AC power connector
The power cord for the power supply connects here.
Power-supply/Fan CRU
The two hot-swap power supplies with built-in fans are located on the back of
the expansion unit.
Attention: The EXP300 comes with two power-supply/fan units installed.
When one power supply fails, the power-supply unit must be replaced to re-
establish redundancy. When replacing the failed unit with the new power
supply unit, ensure that this operation is performed in less than 10 minutes to
prevent any overheating.
The fan that is visible from the rear of the power supply is an auxiliary fan
that is normally off. This fan turns on only when the main fan within the
power supply fails.
Power on/off switch
Use this switch to turn the power supply on and off.
Fault LED (amber)
When completely lit, this amber fault LED indicates a power supply failure or
that a redundant power supply is not on. This LED also flashes when the
built-in fan fails.
DC power LED (green)
This green LED is lit when the expansion unit is turned on and is supplying
both 5 V and 12 V dc power.
AC power LED (green)
This green LED is lit when the expansion unit is receiving ac power.
Handles The two handles are used for installing and removing the power supply.
ESM board user controls
Two environmental services monitor (ESM) boards are accessible from the back of the
expansion unit. These components contain several user controls, indicators, and
connectors.
ESM board The environmental services monitor (ESM) boards contain the SCSI
controls and LEDs.
0
1
2
3
4
5
6
7
8
9
Push pin
Push pin
ESM board
ESM board
Termination-
power
LED (green)
Termination-
power
LED (green)
LVD/SE
LED (green)
LVD/SE
LED (green)
Activity
LED (green)
SCSI reset
LED (green)
SCSI reset
LED (green)
Fault
LED (amber)
Fault
LED (amber)
Activity
LED (green)
SCSI Bus
connector 2
SCSI Bus
connector 1