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Motorola XR900 Series User Manual: Controls And Indicators; Overtemperature Indicator; Test Switch

Mass storage subsystem.
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Controls and Indicators

This chapter describes the controls, indicators, and operating
procedures for the XR900 chassis. Only those controls that are part
of the base chassis configuration are described here; many of the
mass storage modules used in the chassis are equipped with
controls and/or indicators of their own. For a description of the
controls and indicators on a specific module, refer to the user's
manual for that module.

Overtemperature Indicator

The Overtemperature LED (located next to the SCSI connectors on
the back panel of the XR900 chassis) turns on when the temperature
sensor in the enclosure is not adequately cooled. At that point,
Motorola-supported SCSI devices in the XR900 (and most other
SCSI devices) are approaching their upper temperature limits but
are not in danger of immediate damage. The sensor temperature is
typically about 20˚ F above ambient temperature.

Test Switch

Near the SCSI connectors on the lower back panel of the XR900
chassis is a test switch, used for calibration purposes at the factory.
The switch needs to be in the
supply to operate; flipping the switch disables the unit.
3Operating Instructions
position for the XR900 power


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