5103 FORMS FEED STEPPER
MOTOR/EMITTER
TIMING
Adjustment
Two
techniques are available
for
the adjustment
of
the
emitter timing: the general logic probe method and a
program that must be entered manually. The logic probe
method provides sufficient accuracy
for
normal printer
applications, but,
print/
plot
applications that require
reverse forms motion may need
to
use the programming
technique.
General Logic Probe (GLP) Adjustment Method
1.
2.
3.
4.
3-108
Power down.
Remove the printer cover. Refer to the 5103
MIM
(310).
Connect a jumper wire between test points FMA
and
G7
• (forms
motor
driver A
to
ground).
a.
Move the black wire from TPB2-6C
to
TPB2-3C. Refer
to
the 5103
MIM
(300).
b.
Move the red wire from TPB2-5B
to
TPB2-6C.
Loosen the photocell assembly (two screws
II
behind the motor) so that the assembly will slide
but not move by itself.
5.
Connect the probe power lead (red)
to
test point
V5 and the black lead
to
G6.
6.
Place the Printer Adapter card
in
the service
position on machines with
EC
579623 or
EC
579920. Refer
to
the 5103
MIM
(312).
7.
Probe
A2-U07
on the
B1
board with the probe
ground lead on
P08.
On
machine~
without
EC
579623 or
EC
579920, probe TPA on the forms
feed emitter amplifier
card.
with the probe
ground lead on test point G8.
8. Power up.
9.
Slide the photocell down
as
far
as
possible.
10. Slowly slide the assembly up until the probe UP
light comes on.
Note:
If
the UP light is on
with
the photocell down
as
far
as
possible, slide the assembly up until the
UP light goes out and then comes back on.
a.
Hold the photocell assembly firmly
in
place and
tighten the
two
screws.
b.
Verify the adjustment
as
follows:
- Apply a small amount
of
forward force on
the platen knob. The probe should stay at
the up level when you remove your hand
from the knob.
- Apply a small amount
of
backward force on
the platen knob. The probe should stay at a
down level when you remove your hand from
the knob.
c.
Readjust
if
necessary.
d.
Power down.
e.
Move the red wire from TPB2-6C back
to
TPB2-5B. Refer
to
the 5103
MIM
(300).
f. Move the black wire from TPB2-3C back
to
TPB2-6C.
TPB
0
TPAO
Right End
VieVli
,/
/
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