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CPU
5.1.
General
2ilog
SECTION 5
MAINTENANCE
CPU
The board level preventive
maintenance
consists
of
board
inspection
and
checking for correct jumpering, switch set-
tings, voltage inputs, and front panel
indicator
readings.
The onboard system power up diagnostics (SPUD) test the pri-
mary functions of the
CPU
and
peripherals
and
test
the
system's ability to execute a limited number of instructions
and communicate with the system peripherals.
Th~
selection
of
the
primary
boot device is by the four-pole switch U70
and is given in Table 2-9.
The corrective
maintenance
for
the CPU board is primarily by board replacement.
5.2.
Preventive Maintenance
Preventive maintenance consists of
routine
inspection
and
cleaning
procedures.
These
can
be performed at the same
interval as
the
processor
and
System
8000
inspections.
Whenever
it
is necessary to remove the board from the card
cage, inspect the board for signs of excess
heat
or
dirty
pin connectors.
5.3.
eorrective--Maintenallce
The
SPUD
routine
is
automatically
performed
at
system
power-up
in
response
to the RESET-and START control func-
tions.
SPUD tests the primary
functions
of
the
CPU
and
exists
in the onboard EPROM.
The test functions are listed
in Table 5-1. If a peripheral device
is
the
primary
boot
device,
as
determined
by
switch
U70,
it will always be
listed and tested and will be the first device on the
list.
Console
operation
from the serial channel 1 (SID 0) I/O of
the CPU board is necessary for the diagnostic routines to be
used.
If
a
problem exists in bootstrapping the system or
console does not indicate "POWER-UP
DIAGNOSTICS
COMPLETE",
check the console for recorded errors.
"COMPLETE" indicates
the completion of SPUD.
5.3.1.
System Power-up Diagnostics:
1.
5-1
System 8000 Instruction Test
instructions are tested.
2ilog
Specified
System
8000
5-1
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