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Board Checking
Boards inside the central subsystem (boards
that have microprogramming (firmware) capabili
ties) have built-in self-checking capabilities and
LEDs (Light-Emitting Diodes) for problem indica
tion. When the computer is powered up, the
LEDs on the associated boards are illuminated,
and after internal checking is finished, the lights
are extinguished one after another. Any LED
remaining lit indicates a malfunction on that
board and the CHECK light on the operator's
panel is lit to inform the operator. The operator
thereby identifies the board which is malfunction
ing. This allows the integrity of the configuration
to be quickly checked, ensuring that all boards
are inserted properly (filling every consecutive
slot) and all terminators have been inserted.
Accessing and Checking Boards
The operator is required to check and iden tify
malfunctioning boards inside the central subsys
tem. The accessing and checking procedures for
both
the
freestanding
(tabletop) and
rack
mounted versions of the central subsystem are as
follows:
Freestanding (Tabletop) Central Subsystem
1. With the power ON, push the right and left
cover release levers. (The release levers are
located on the left and right side of the
base chassis, 6 inches from the front.)
2. Lift the white cover upwards as far as
possible. (The cover opens far enough to
allow easy access to the boards for viewing
and if necessary, removal.)
3. Check the boards in the cabinet for the one
with the illuminated LED. (The LED is
located in the right front section of the
board and is easily viewed by the operator.)
4. Gently apply pressure to the front of the
lighted board to ensure that it is positioned
and seated properly.
5. Take the applicable action to correct any
malfunctioning board (e.g .. replace, notify
Honeywell FED, etc.)
6. Once the light is extinguished, push the
white cabinet cover down to its original
position, ensuring that it is locked in place.
Rack.Mounted Central Subsystem
I. With the power ON, grasp the white face
plate covering the operator's panel and
CENTRAL PROCESSOR CONTROL PANEL
remove. (The face plate is kept in place by
a series of pressure fittings which are easily
disengaged.)
2. Once the front of the operator's panel is
exposed (black rectangle with the buttons
and indicators), the next operation is to
unlatch and swing away the operator's
panel for access to the boards.
3. To remove the operator's panel:
A. Unlock the operator's panel. (Turn the
set screw, on the extreme lower right
section of the operator's panel chassis,
counter-clockwise.
B. Swing the hinged operator's panel to the
left. (Once it is opened the operator has
easy access to the boards for viewing
and if necessary removal.
4. Check the boards in the cabinet for the one
with the illuminated LED. (The LED is
located in the right front section of the
board and is easily viewed by the operator.)
5. Gently apply pressure to the front of the
lighted board to ensure that it is positioned
and seated properly.
6. Take the applicable action to correct any
malfunctioning boards (e.g., replace, notify
Honeywell FED, etc.)
7. Once the light is extinguished, swing the
operator's panel closed (to the right) and
turn the locking set screw clockwise.
8. Reposition the white face plate cover over
the operator's panel and apply pressure to
ensure proper positioning.
PHYSICAL CHARACTERISTICS
A variety of cabinet options is available for the
central subsystem. All offer easy access and
require only front-to-rear airflow for cooling:
Drawer unit 5.25 inches (l3.33cm) high for
standard EIA rack mounting.
60 inch (1 52.40cm) high cabinet for central
subsystem, diskette, and other drawers.
Tabletop configuration- completely enclosed,
completely portable, 5.S inches (13.97 cm)
high, 19.5 inches (49.53 cm) wide, 29.7 inches
(75.43 cm) deep.
2-5
AT04
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