22.1
SPRING
SCALE
- ZERO CALIBRATION
Many adjustments made in
the
field require
the
use of
spring
scale,
PN
9900012.
Reports
indicate
that
the
accuracy
of
the
scale
is impaired due
to
the
zero
ad-
lustment
celng
I
ncorrect
before measurements
are
made.
The
zero
adjustment can be made by removing
the
two screws
that
fasten
the
end
cap,
and
removing
the
end
cap.
This exposes
an
adjustable
collar
se-
cured by a
#4
Allen
screw.
The
zero
adjustment
can
be made by loosening
the
Allen screw and
reposition-
ing
the
collar
on its
shaft.
The hook may have
to
be
removed
from
the
scale
to
allow
the
shaft to move far
enough
to
expose
the
Allen screw; however,
the
hook
should
be
replaced
when checking
the
zero
adjustment.
Correct adjustment is
checked
by holding
the
scale
in
the
upright position (hook hanging down) and
observ-
ing
that
the
scale
reads
exactly
o.
~
______
Allen Set Screw
Figure
22.0
PREVENTIVE
MAINTENANCE
23.0
Preventive
Maintenance
For
complete
PM
procedures see
the
Reference
Man-
ual #225-1726 (Keyboard) and #255-3207
(Keyooard-
less). The following method of
"cycle"
inspection
is
recommended. The
I/O
Printer should
be
PM'd four
times a
year
for sing
Ie
shift
operation.
The frequency
should
be
increased in
direct
proportion to shift
usage.
Each inspection should
include
a complete lubrication
as
outlined
in
the
Reference
Manual.
Each inspection
should
cover
a
different
area
of
mech~riical
check
and
adjustment.
1st Inspection
--
Cyc
Ie
Clutch,
Ti
It
Mechanism,
Ribbon Mechanism
2nd Inspection
--
Keyboard
Area,
Rotate Mechanism,
Detenting
3rd Inspection
--
Scoping - Print Magnets,
Oper-
ational
Magnets, Contacts
4th Inspection
--
Operational
Area
23.1
The following items require
special
attention:
a • Motor
and
Motor
Pu
Iley •
b.
Cycle
Clutch
Spring and Arbor.
c.
Driven
pulley
hub and
bearing.
d • 0peratfontrl-EtirrrB-earmgs.
e.
Operational
Shaft
and
Shift
Cam
Bearings.
f.
Shift Clutch Spring
and
Arbor.
These items should
be
lubricated
every
8 weeks for
shift
usage.
23.2
LUBRICATION
Two
new lubri
cants
have
been
re leased
to
rep
lace
a
II
present lubricants for
the
SELECTRIC
I/O
Printer.
The first new lubricant
is
IBM
#23.
This
wi
II
be
sup-
plied in
1/2
ounce
tubes
and
in 1
lb.
cans.
It
should
be used
wherever
Si
I-X
or
a
grease
was previously
recommended.
In
most cases
the
IBM
#23 in
the
1
lb.
can
should
be
used in
conjunction
with
the
grease
gun,
PN 158645, and
the
speci a I nozz
Ie,
PN
450813.
Don't forget
to
use this
special
nozzle
on
the
cycle
clutch
grease
hole
located
between
the
negative
5
cam
and
the
RH
positive
cam.
The second new
lubricant,
IBM
#10,
should
be
used
wherever
an
ET
#6 or
IBM
#9 oi I was previously
spec-
ified.
The new
IBM
#10 oi I
can
be
identified
by a red
cap
on
the
cam.
The new
IBM
#23
grease
can
be
identified
by
the
cap
on
the
1/2
oz.
tube
and
the
one pound
can
wi
II
be
clearly
marked
IBM
#23.
Machines with high shift usage require more frequent
lubrication than machines used for sing
Ie
shift
oper-
ation.
The following
areas
are
primarily
affected
by
-idling
time,
since
only
the
operational
shaft is
driven.
1.
Motor and motor
pu
Iley .
2.
Cycle
clutch
spring and
arbor.
3.
Driven pu lIey hub and
bearing.
*
4.
Operati
ona I cam beari ngs .
5.
RH
operational
shaft and shift cam
bearing.
6.
Shift
clutch
arbor
and
spring.
When power
is
on
24
hours dai Iy, we recommend
lubrication
of
items 1 thru 6
every
eight
weeks.
Note:
Lubrication must
be
applied
judiciously
to
eliminate
migration
or
"spin-off" into
electrical
con-
tact
areas.
IBM
No.
Part
No.
Descripti on
23
1280441
1/2
oz.
tube -
IBM
#23
23 1280442
1
lb.
can
-
IBM
#23
10
1280443
4
oz.
can
-
IBM
#10
10
1280444
1
pt.
can
-
IBM
# 1 0
The
above
part numbers
are
avai
lable in
Mechanics-
burg, and
all
EPC's.
*
See
S.H.
15.7
4-28
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