(
Symptom
003 through 010 intermittent errors.
003 and 004 errors when marking
new tapes.
003, 004, and 007 errors.
003, 004, 007 and 008 errors.
004 and 007 errors on diagnostics
and customer jobs.
004 and 007 errors.
004,005,
006, 007, and 008 errors.
004, 007, and 008 errors.
007 errors.
Isolation
Aid
Check the customer grounding and
the 5100 grounding.
None.
Check
for
bad solder connections at
paddle cards and cable connectors.
Also check
for
strands
of
wire
shorting
to
pins.
None.
Moving the cable that goes
to
the
CRT
away from the tape control card
causes the problem
to
disappear.
Loose
read/write
head.
The customer usually sees only 005
errors, but
can
create 007 errors
unknowingly.
Locking wheels are not centered or
seated properly in the base.
Excessive retries.
Fix
Check
to
see
if
customer is using
an
ungrounded extension cord.
Replace the LED/PTX assembly.
Replace
or
repair the cables and verify
that all connections are good.
Replace the H2 card.
Replace the
CRT.
Replace the
read/write
head.
Adjust tape microswitches
for
a
clearance
of
0.001 inches (0.025 mm)
to
0.003 inches (0.076). Adjust
for
maximum overtravel.
Adjust the locking wheels (see 225)
and check the adjustment by pulling
the cartridge out about
1/8
inch
(3
mm)
and
releasing
it. The cartridge
should seat
in
the tape unit.
Check the select magnet and the
jackshaft adjustments.
(See
222 and
223.)
The motor locks up or does not move Replace the motor.
the tape properly.
The tape rubs against the cartridge
base plate or plastic top.
Extra bytes are written
in
the data
record filed on the diagnostic tape
cartridge during a CMD 0 or CMD
1.
Reposition the tape on the spools by
doing a )LlB
or
UTIL; then mark a file
to
the end
of
tape and do a rewind.
Check out the tape by doing a )LlB or
UTIL on the diagnostic tape cartridge.
If
this works, load the failing file
using the CMD 8 function.
If
there is
an
error
in
the data,
an
007
error will be displayed. You
can
rebuild the damaged file using a
known good tape and CMD 8 and
CMD 9 procedures.
The display is not blanked during tape
IN
PROCESS
and
PROCESS
CHECK
operations. leads are swapped.
(See
210
for
correct wiring).
Intermittent
Failures Troubleshooting Guide 3-91
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