Rtpand Eop; Actuator Arm - Radio Shack TRS-80 Service Manual

WARNING
TURN POWER
OFF
BEFORE REMOVING CARRIAGE
1.
Move
the carriage
assembly
to
the center of the
printer.
2.
Remove
the ribbon cartridge assembly.
3.
Remove
the
print
head and
video amplifier assemblies
per paragraph
3.4.B
and
3.5.B
respectively.
4.
Loosen
the carriage
drive belt by turning, counterclockwise the
two
adjusting screws on
the
idler
pulley
assembly
NOTE: THE
IDLER
PULLEY ASSEMBLY
IS
LOCATED ON
THE
LEFT SIDE OF THE
PRINTER.
5.
Remove
the retaining
ring
on
the
left
end
of
the upper guide
bar.
6.
Remove
the
two screws mounting
the upper guide
bar
to
the
right
frame.
7.
Loosen
the locknut and screw
attaching the bottom
of
the carriage
to
the bottom guide
bar.
8.
Remove
the
upper and lower
ribbon
drive
monofilament from
the ribbon
drive
shaft.
9.
While
supporting the carriage assembly,
slide the upper guide
bar
to
the right through
the carriage assembly
NOTE:
RETAIN
THE RUBBER
O-RING
REMOVED FROM
THE
LEFT
END OF THE UPPER
GUIDE
BAR.
10.
Remove
the carriage assembly from
the
printer.
C.
ADJUSTMENTS
(Figure 3-5)
1.
Adjust ready
to print (RTP) actuator
arm
parallel to
and 59
mm
(2.3 inches)
from
the upper guide
bar.
2.
Adjust end of
print
(EOP)
actuator arm
parallel to
and 54
mm
(2.1
inches)
from
the upper
guide
bar.
3.
Once
the actuator arms have been
adjusted, slowly
move
the carriage assembly from
left
to
right
ensuring the
RTP
and
EOP
actuator
arms
do not contact the RTP and EOP
optical switches.
CARRIAGE
UPPER
GUIDE
BAR
Figure 3-5.
RTP
AND
EOP ACTUATOR
ARM
ADJUSTMENTS
D.
PREVENTIVE MAINTENANCE
1.
Wipe
the upper and lower guide
bar clean using
a soft
clean
cloth.
3-11