Seagate ST39173WC Specifications Page 75

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Chapter 5 Maintenance and Service 5-5
5.1.2.1 RSM Tray
A common point of failure on the RSM tray is with the WD2S card, part number 370-
2196 (older version) and part number 370-3375 (newer version). This card is located
at the point where the SCSI cable attaches to the RSM disk tray. The function of this
card is to convert Wide Differential SCSI to Single Ended SCSI.
The other common point of failure on the RSM tray is with the SEN card, part
number 370-2195. The SEN card should have microcode rev 1.1. When you replace
the Wide Differential 2 SCSI card, change the SCSI ID range from 0-6 (default) to 8-
14, which is needed to see the SCSI IDs properly in a Sun StorEdge A3x00 array.
Failure to do so results in a ghost drive [15,15].
5.1.2.2 D1000 Tray
The common point of failure on the D1000 tray is with the differential SCSI
controller board, part number 375-0008.
The disk tray midplane is also a single point of failure but only in rare cases. In very
rare cases a failed drive can tie up the entire SCSI bus causing the remaining drives
to be rendered inaccessible. This problem can be easily mistaken as a bad disk tray
and somewhat difficult to isolate. Compare each drive’s LED pattern. In some cases
a failed drive will indicate a different LED pattern from the remaining drives.
5.1.3 Power Sequencer
The power sequencer has two groups of four sequenced power outlets and one
unsequenced power outlet. They are designated sequenced group 1 and sequenced
group 2. There is a four second power on delay between sequenced group 1 and
sequenced group 2. The unsequenced outlet remains on as long as the sequencer
circuit breaker is turned on and the sequencer is connected to an AC power source.
When one half of the rack does not receive power, it is usually the result of power
sequencer failure.
The first thing to do is to verify that the power sequencer is plugged in to a 220 VAC
power source.
Note At the bottom of the expansion cabinet are two power sequencers. The front
power sequencer is hidden behind the front key switch panel. Remove the front key
switch panel to gain access to the power sequencer’s power cable.
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