c
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Symptom
Isolation Aid
Intermittent tape errors 004, 007, and None.
OOS.
A 152 error did
not
occur when
loading a file larger than
64K
bytes.
Intermittent processor checks
from
the keyboard.
Blank CRT.
Check to see
if
failure occurs only on
64K
machines.
Usually fails when keying fast.
None.
Fix
Adjust the select magnets
for
correct
air gap.
Alter
storage size
to
6 bytes less than
64K
when trying
to
load a file larger
than 64K.
Replace
F2
card.
Check
that
the CRT connector is
plugged in properly. The end
of
the
cable
that
has 5
wires
must be
toward the
front
of
the 5100.
Intermittent processor checks.
Meter the process check
for
a '+RDR' Replace the CRT.
error.
Intermittent processor checks on halt
11S
with
bring up diagnostics.
003
and
004
tape errors.
Unplug the fan (for no more than 15
minutes)
to
cause a solid failure.
Check the status byte in location
OOSF.
The byte
will
be
35
for
normal
and
39
with
this error.
On
the
5100 model
C,
the character Failure still occurs when you enter
entered does not match the character characters
with
about 15
to
20
keyed. seconds' delay between strokes.
Dropping power.
Noisy tape drives.
Keyboard locks up intermittently.
Power up fails intermittently.
Processor checks on power up.
Fading
CRT.
No
power
to
A 1 board.
Print
plot
stops intermittently.
004
and 007 errors.
Plug the power supply into another
5100
to
be sure
it
works.
Fails usually in one direction.
None.
Switch J 1 and
J2
plugs.
None.
None.
Check the AC voltage on the output
of
the line filter.
None.
None.
Replace
E2
card.
Correct defective
read/write
head.
Replace C2 card.
Replace POWER
ON/OFF
switch.
Replace jackshaft.
Replace CRT.
Replace the POWER
ON/OFF
switch.
Check
Y1
cable plugging.
Replace G2 card.
Replace the AC line filter.
Replace G2 card.
Replace internal
or
external cable.
Tape errors. None. Replace
CRT.
Characters on the CRT are
different
sizes.
Characters at the
top
left
corner
of
Replace
F2
and
J2
cards.
the CRT are larger than those at the
bottom
right corner.
Intermittent '+RDR' processor checks. The error becomes solid when you Replace
F2
card.
unplug the fan
for
15 minutes or less.
CRT display jitters. Check the connectors on the
brightness control potentiometer.
Character entered does
not
match the None.
character on the CRT.
Replace
J2
card or
the
CRT.
Replace defective display, storage,
or
ROS card.
Intermittent Failures Troubleshooting Guide 3-93
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