Platen Drive - Radio Shack TRS-80 Service Manual

A/Ore:
VFU
DRIVE,
INSTALLED ONLY WHEN
USING OPTIONAL
VERTICAL
FORMAT
UNIT.
Figure 3-6A.
KIT,
PLATEN DRIVE
ASSEMBLY
C.
ADJUSTMENTS
(Figure 3-7)
1.
Armature
to Releaser
Gear Adjustment
a.
Loosen the
two mounting
screws that secure the platen drive assembly
solenoid.
b.
Press the armature
up
against the platen drive
releaser gear until a
0.004
to
0.006
inch (0.10 to
0.015
mm)
gap
exists
between
the
releaser gear
and
the armature, then tighten
the
mounting
screws.
2.
Armature
to Solenoid
Adjustment
a.
Insert
a
0.036 inch (0.91
mm)
feeler
gauge between the armature and
the solenoid.
b.
Loosen the
two
set-screws that secure the
armature
stop arm.
c.
Move
the stop
arm
until
it
contacts the armature, then
tighten the
set-screws.
3.
Back Stopper Adjustment
a.
Turn
the eccentric
bushing
to allow for
a
0.004 to
0.012
inch (0.10 to 0.30
mm)
clearance
between
the
back
stop-
per
and
the spur
gear.
Boclt
Stopper
Adj.
0.00«-O.OI2in
(0.102-0.303
mm)
(0.91mm)
Figure 3-7.
PLATEN DRIVE ASSEMBLY ADJUSTMENTS
3-14