Platen Assembly; Kit, Platen - Radio Shack TRS-80 Service Manual

4.
Line
Feed
Clutch
Helical
Gear Adjustment
(Figure
3-6)
a.
Place the
helical gear
alignment
tool
A(63003455-3001) on
the
drive
motor
shaft
between
the
line
feed clutch
drive gear
and
the
idle
pulley stopper
collar.
b.
The
helical
gear of the
line
feed
unit
should
align into
the
slot
on
the
tool.
If
not, loosen the
drive pulley bearing
holder unit
and move
the drive shaft
until
the gear snaps into the
slot.
c.
Once
the adjustment
is
completed,
tighten the hardware.
D.
PREVENTIVE MAINTENANCE
1.
Verify the
proper
setting of the
line
feed clutch armature
to the platen drive
releaser gear.
2.
Ensure
that the printer
is
line
feeding properly.
3. Lightly grease
all
gears in the
line
feed clutch
unit.
3.10
PLATEN ASSEMBLY
(Figure
3-7A)
REFERENCE
ASSEMBLY
17
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
A.
FUNCTION
PART NUMBER
63780154-5001
535366001-5001
535537001-2001
535538000-2001
535180000-2001
535075001-5001
525743001-2001
535043001-2001
525745001-2001
535301001-2001
535298001-2001
535302001-2001
535303001-2001
535304001-2001
525744001-2001
535305001-2001
535306001-2001
535307001-2001
DESCRIPTION
Kit,
Platen Assembly
Note: This
kit
contains items
1
through 17
Platen Unit
Bushing
Spring Stopper
Clip
Bushing
Pin Tractor
Drive Pulley (26-1
1
52)
Set-Screw,
M4
x
4
mm
Lg. (26-1
152)
Spacer
Set-Screw,
M4
x 6
mm
Lg.
Paper Feed
Pulley
Paper Feed Coupler
Sleeve Unit
Spring
Paper Feed Knob
Paper
Feed Coupler
Set-Screw
M4
x 5
mm
Lg.
Paper Feed
Knob
key
Paper Feed
Knob
Paper Feed
Knob
Joint
QTY
1
The
platen assembly
provides the hard
surface for print
head
solenoid impact.
The
platen
knob
is
on the
right side of the
platen
assembly;
it
can be
pushed
in
and
rotated for manual
paper movement.
B.
REMOVAL/REPLACEMENT PROCEDURE
TOOLS
REQUIRED:
M4
Hex
Key,
Flat Blade Screwdriver
1
.
Remove
the paper feed knob from
the right side of the platen assembly.
2.
Remove
the
two
stop
collar springs
(3)
from
the ends of the platen assembly.
3.
Remove
the bolt
and
flatwasher
mounting
adjusting
plate
from
the
left
end
of the
platen.
4. Slide the
two
brass bushings
(2
and
4)
towards the center of the printer
and
lift
the platen
assembly from
the
printer.
3-15