(
(
•
If
intermittent problems exist which are caused by
poor grounding:
Proper grounding is necessary
for
proper operation
of
the printer. Check the following list
to
help find
intermittent problems:
a.
Ensure that the customer has provided the
proper grounding
for
the 5100 (the green wire
goes
to
ground).
b.
Ensure that the
I/O
signal cables have a good
ground at the 5100.
c.
Ensure that the forms tractor unit is set securely
on the printer.
d. Ensure that the wire forms rack is electrically
connected
to
the printer frame. A resistance
of
100K ohms or less between the forms rack and
the printer frame is acceptable. Refer
to
the
5103
MIM
(300).
e.
It may
be
necessary
to
ground the forms rack
to
the printer
with
a ground wire.
f. Check
for
electrical noise generated from other
machines
in
the area,
or
for
electrically noisy
machines connected
to
the same AC line
as
the
5100 computer.
•
If
printing intermittently stops:
Capacitor C4 is the filter capacitor
for
the +5Vdc
supply
to
the printer. The printer might not
operate if this capacitor is
not
in the circuit. Refer
to
the 5103
MIM
(303). Check
for
the following:
a.
Capacitor C4 might be open.
b.
The wire betweeen C4 and test point A 1 might
be
loose
or
broken or might have a bad crimp.
c.
The land pattern between test point A 1 and test
point V4 might be open.
d. The wire between capacitor C4 and test point
4F might be loose or broken or might have a
bad crimp.
e.
The land pattern between
test
point 4F and test
point
G6
might be open. Refer
to
the 5103
MIM
(386).
The circuit card A 1 A 1 contains most
of
the control
circuits
forthe
printer. This card may
be
replaced
in
an
attempt
to
fix
intermittent problems. Refer
to
the 5103
MIM
(303).
Intermittent
Failures Troubleshooting Guide 3-11&
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