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Z8OQT
Insert the modified IC socket into the self test socket.
2.
3.
Insert the
addition to
effectively modifying the
In
disable all
line and
forcing
traps to
NO
during
Disabling these inputs and messages
socket since all lines are wired to the active state.
5-8.
Troubleshooting
Thefollowingparagraphs
identified
as the
the Timing Circuits. The
are identified in the Theory
considered
A
is
pod
in Table 5-1.
For
more
that
fact
a self test can be performed indicates
Section, since
operation
communication.
With the
Interface Section or the Timing Circuits
Prepare to troubleshoot
Disassemble the pod by removing the PCB assemblies from the case,
1.
and
the shield
tion under
the heading Disassembly.) It
PCB assemblies at this point.
Connect
2.
the UUT, as shown in Figure
means of the shielded cable, and
to the
microprocessor
the UUT,
although
Pod
UUT for
All
references to
shooting
guide are in
noted, all mainframe probe operations are performed
synchronized
connector into
ribbon
cable
interrupt inputs,
setup editing as described in the mainframe manual.
Defective Pod
a
NOTE
reference three distinct areas
Processor
Section, the UU
components
of
Operation,
defective when it fails a self test. Pod faults are summarized
detailed
self
testing error
of the Processor Section
Processor
the defective pod as follows:
from
the PCB assemblies. (Refer to disassembly
the pod to the mainframe, and the ribbon cable
5—2.
socket. Also, Figure
any suitable UUT may be used. (Refer to Selecting a
Testing.)
NOTE
data and addresses
hexadecimal notation.
mode.
the modified IC socket.
ribbon
cable connector, be sure to
and set all forcing line and
necessary when utilizing the self test
is
Tlnterface
which make up these sections
presented
analysis, refer to Table
operation
necessary for mainframe/ pod
is
Section proven
to
contain
the fault.
not necessary to separate the
is
that
the mainframe
Note
by means of a second pod connected
not
shows the self test socket
5-2
in the
following
Unless otherwise
interrupt
of
pod
the
and
Section,
Section
in
4.
The
5-3.
of the Processor
be good, the UUT
informa-
connector
to
connected by
is
as
trouble-
the
in
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Table of Contents
Troubleshooting
