Drive - Radio Shack TRS-80 Service Manual

4.2
PREVENTIVE
MAINTENANCE
(P.M.)
The recommended
Preventive
Maintenance (P.M.) schedule,
if
followed
closely
and accomplished
at
the intervals
noted,
will
ensure
maximum
operating efficiency
and
maximum
mean time between
failures.
A.
FREQUENCY OF
P.M 6
MONTHS
B.
TIME
REQUIRED
3/4 Hr.
(Approximately)
C.
CLEANING MATERIALS
MEDIUM
BRISTLE
CLEANING
BRUSH,
TWO SOFT CLEAN
CLOTHS,
MILD
DETERGENT
D.
RECOMMENDED LUBRICANTS
RHEOLUBE
No. 723ms. Mfg. Spec. No.
30050070-0001
E.
RECOMMENDED TOOLS REFER TO SECTION
4.1
OF THE
MAINTENANCE
SECTION
F.
PREPARATION
OBTAIN PRINT SAMPLE PRIOR TO BEGINNING
P.M..
CLEAN
PRINTER WITH
VACUUM
CLEANER,
IF
AVAILABLE.
PREVENTIVE MAINTENANCE REQUIRED
ASSEMBLY ACTION
1.
COVER
ASSEMBLIES
1.
CLEAN
all
cover assemblies
using
a
mild detergent.
2.
RIBBON
CARTRIDGE
2.
INSPECT
ribbon
cartridge for
proper ribbon
tracking.
Check
ribbon pinch
rollers for
proper meshing.
3.
CARRIAGE ASSEMBLY
3.
CLEAN
upper and lower
guide bars using
a soft
clean
cloth.
4.
DRIVE
MOTOR
4.
INSPECT
line
feed clutch
drive gear to
ensure
it is
perpendicular to the
platen drive clutch.
5.
PLATEN DR
IVE
5.
LUBRICATE
all
gears in
the platen
drive.
INSPECT
platen drive armature
for
proper
setting to platen drive releaser gear.
6.
PLATEN ASSEMBLY
6.
CLEAN
platen using
a
mild
detergent.
7.
COLUMN SCALE/TEAR BAR
7.
CLEAN
column
scale/tear bar using
a
mild
detergent.
4-2