System Control Panel - Xerox 550 Reference Manual

The controls and indicators of the System Control Panel (see
Figure 15) are functioanlly described below.
POWER ON
This alternate-action switch/indicator controls the appli-
cation of power to the system. The indicator is illuminated
only when the switch has been depressed and power is being
applied to the system.
PRIMARY POWER
This indicator is illuminated whenever PRIMARY power is
applied to the system.
POWER FAULT
This indicator is illuminated only if an abnormal power
system condition exists. Maintenance action is required
when the POWER FAULT indicator is lit.
MAINTENANCE MODE
This indicator is illuminated when the computer system is
placed in the maintenance mode as the result of the MAINT
MODE switch being in the ON position.
INTERLEAVE DISABLE
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leaving feature of the memory system is inhibited. (See SET
MEMORY INTERLEAVE OVERRIDE command, under" Main-
tenance Control Commands".)
MOOEII'AULT ~
PONEION
POWER FAULT
I
IDLE RUN
0
MAINTENA"'CE
2
MODE
INTERLEAVE
DISABLE
3
CLOCK POWER
4
ALARM
MARGIN MARGIN
-.ul'P'ONER
CLOCK MARGIN
This indicator is illuminated whenever the system clock
frequency is above or below the normal value (usually as
a result of maintenance and/or diagnostic activities; see SET
LOW CLOCK MARGINS and SET HIGH CLOCK MARGINS
commands, under "Maintenance Control Commands").
POWER MARGIN
This indicator is illuminated whenever any power supply
within the computer system has its low margin switch set.
SENSE SWITCH
These four indicators display the status of the four sense
switches. Each indicator is appropriately marked (1, 2,
3, 4) and is illuminated only when the corresponding sense
switch is on.
ALARM
,This indicator is illuminated whenever the system Alarm
flip-flog has been set, signifying that a condition has
occurred which requires the attention of the operator. This
visual alarm may also be augmented with an audio alarm
(see ALARM AUDIO, below).
IDLE
This indicator is illuminated whenever the BP operations
have been interrupted by the ECS. When the system is in
the !DLE
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instructions only upon request from the System Control Con-
sole. The BP states (RUN, WAIT, or HALT) are only de-
fined when the BP is executing instructions.
IP STATUS NO.
ALARM. AUOIO
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Figure 15. System Control Panel
Control Commands 145