Hitachi AMS 2100, Service Manual

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1–38
Introduction
Hitachi AMS 2000 Family Storage System Service Guide
status LEDs
The High-density Expansion Unit ENC unit connects the high-density
expansion unit to the base unit and can also connect it to another high-
density expansion unit. The ENC IN connector includes an ALM (alarm) LED
that turns on when the ENC card to which it is connected fails. The LOC
(locate) LED for the ENC unit is located on the OUT connector. These LEDs
are shown in Figure 1-36 .
Figure 1-36: High-density Expansion Unit ENC LEDs (Rear Panel)
The ENC card inside the unit also has ALM and LOC LEDs on the top edge of
the card. They are visible when the drive cover is removed from the high-
density expansion unit, and are shown in Figure 1-37 . Table 1-27 describes
the function of these LEDs, which have exactly the same function as those
on the rear panel.
Figure 1-37: High-density Expansion Unit ENC LEDs (Card)