Symptom
Broken print wires.
(
Printer blows fuses.
(
+24 Vdc supply voltage is too high.
Printing stops.
(
(
Isolation
Aid
To prevent breaking print wires:
Set the copy control dial
to
the proper
forms thickness.
Instruct operators never
to
print over
perforations, feed holes or the edge
of
the forms.
Ensure that all fixes
for
ribbon jams
are installed.
Disconnect
EC3
at the print head
to
keep from blowing fuses; then
measure the wire driver inputs at
cable A1A3 with your meter. All
inputs should be at
an
up level
of
+4.5
to
+5.5 Vdc or +1.4
to
+20 Vdc.
A
down
level indicates
an
active level.
None.
Fix
Check
for
more than one active wire
drive signal from the system.
Check
for
a defective signal cable.
Replace A1A1 card and the
Q1
transistor.
Capacitor C4 is the filter capacitor
for
The problem
can
be caused by any
of
the +5 Vdc
to
the printer. the following:
• Open capacitor
C4.
• Loose, broken, or poorly crimped
wire between C4 and point 1 A.
• Open circuit between point 1 A and
test point V4.
• Loose, broken,
or
poorly crimped
wire between point 4F and
capacitor
C4.
• Open land pattern between point
4F and test point
GS.
Replace the A 1 A 1 card.
Intermittent
Failures
Troubleshooting
Guide
3-103
To Next Page
Loading...
