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ZSOQT
Perform
a.
lines of
I/O
write
data
Perform
b.
while sequentially applying
input
pins (pins 2-9 of
mainframe should indicate each high and
port
A.
the output operation
Check
7.
repeating
step
and address 2082
Check the
8.
repeating
step
data
write
00
address 2082, and apply
cable connector.
Check
9.
operation
first writing 00
address 209C. Verify
response to the second write
Check
10.
timing circuits as a result of the low
PCB—to-PCB
ll.
Check for the occurrence of the SYNC signal at pin
shielded cable connector, by repeating step
Check
12.
addresses 0000, 2000, 3000, 4000, 5000, 6000, and 7000. Verify
respective decoder
If
repairs
13.
preceding checks,
test. If self test operates,
Defective Pod.
The
troubleshooting
intend ed to assist
fails to reveal the pod fault,
troubleshooting
Center
Fluke Service
for a list of Fluke Service Centers.
5-18
a write
operation
A
port
(PAO-PA7)
is
00.
a read
operation
both
and observing the mainframe display. The
U2!)
and using address 2083 for the
5
for
the
B
port
input operation
Use address 2083
6.
to set line PB7 as an input. Perform the looping read at
both
+5V
of the interval timer (contained in
to
address 2094 to reset the timer, then writing
m
that
the
operation.
for
the occurrence of the UUT ON signal (produced by the
connector,
by repeating step
both
address decoders by performing read operations at
goes low when addressed.
output
have been made to the inoperative pod as a result of the
reinstall
the pod's microprocessor
but
the pod fails, refer to Troubleshooting a
guidelines presented in the preceding
isolation
of faults within the pod.
the
in
recommended. Refer
is
direction register to set
to the
A
port
inputs. The write address
as
data
at the
register, address 2080,
A
port
and ground to each of the
+5V
applied to the inputs of
low
(contained in U22 and U24) by
of
port
B
port
data
register.
of
line PB7 (MAINTSTAT) by
port
B,
for
direction register and
the
port
B
and ground to pin
output at
U20, pin
lRQ
signal) at pin
9.
9.
of the pod to the nearest
return
the mainframe Service Manual
to
all
is 2081;
A
port
direction register,
B
of the shielded
12
and
U25
26) by
OF
to
goes low
in
18,
of the
19
of the
10
that
the
and attempt
self
paragraphs
are
lf attempted
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Table of Contents
Troubleshooting
