(
(
(
(
('
_/
(~
• +Bus out parity check (F2-D13) - This
is
a
parity check or bus out on the base
I/O
(F2)
card. Either the controller (G2) card or the base
I/O
(F2)
card
can
cause this error.
• +Bus out parity check,
ROS
adapter (E2-B 11) -
The parity
of
bus out is tested on the
ROS
adapter
(E2)
card and the error
can
be probed
there.
• +Bus out parity check, expansion feature
(B2-M02) - The parity
of
bus out is tested on
the expansion feature (B2) card and the error
can
be
probed there.
• +Bus out parity check, printer (A2-P12) - The
parity
of
bus out is tested
on
the printer
adapter card and the error
can
be probed there.
• +Bus out parity check, auxiliary tape (C1-P04) -
The parity
of
bus out is tested on the auxiliary
tape adapter card and the error can be probed
there.
2.
Reseat all cards and cables.
3.
Check voltages.
4. Check the customers AC ground.
5.
Check the fan(5).
Tape
Use the following procedure to help you find the cause
of
intermittent tape errors:
1.
2.
3.
4.
5.
Any cartridges that were written before a problem
was resolved on the tape drive, can still cause
problems.
Check the cartridge stops (see 224).
Perform the Tape Select Magnet Service Check
(see 222).
Clean the tape head with isopropyl alcohol and a
lint free tissue. Check the head adjustment (see
231). Replace the head if it
is
worn.
Clean the spindle assembly and the drive rolls with
isopropyl alcohol and a lint free tissue.
6.
7.
Reset all the cables and the cards in the tape unit.
Check
to
be
sure the tape unit does not face into
a strong light
or
the sun.
8. Make sure the brake arms are white and not black.
AC
Power
Grounding
Checks
To check
for
proper AC power receptacle grounding,
measure the AC voltages at the location shown
in
the
following figure. This check does not detect a poor
quality ground (high resistance
to
earth).
GrOUndrn°
~.
_
~
~Neutral
Hot
~
Front View
If
you suspect a line problem you can:
1.
2.
3.
4.
Place
an
isolation transformer between the line
and the 5100 computer.
Inspect the AC box
to
be
sure the wires do
not
cross. The line side and load side wires should
not cross
as
this
can
induce line spikes
in
the load
side wires.
Check the AC box capacitors
to
ensure they are
not twisted and their wires
are
not crossed.
Check
for
a machine or a device in the same
room, on the same line, or anywhere nearby
that
can induce conductive or inductive noise.
The voltage between neutral and ground should be less
than 2 volts AC.
The voltage between neutral
and
hot should be
approximately 110 Vac
to
120 Vac. Also, the voltage
between ground and hot should
be
approximately 110
Vac
to
120 Vac.
Intermittent
Failures Troubleshooting Guide 3-33
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