IBM Selectric Maintenance Manual page 135

spare belt has been placed on the shaft, it does not
interfere with the positive bai I or the selector latch
links and is not too tight around the cycle shaft as to
cause rotation of the spare belt.
CONTACT ASSEMBLIES
21.0 Contact Assemblies
See the applicable Systems Manual for all specifica-
tions.
21.1 S.H. CLEANING
a. The contacts must not bridge or bounce.
b. The contacts must be clean, especially the N/C
contacts as they tend to bui Id up a residue.
c. The contacts should be cleaned with IBM clean-
ing fluid and wiped dry with clean bond paper.
Caution - Do not use fi les, abrasives, or burn-
ishing tools to clean the contacts.
21.2 S.H. OILY CONTACTS
If the contacts become oily due to oil bleeding from
the blue steel straps, the contact assemblies may be
replaced. I/O Printer contact assemblies now use
nickel plated straps to prevent this problem and they
may be obtained under the original part numbers.
21.3 S.H. TAB INTERLOCK MICRO-SWITCH
If the actuating wire pops out from under the torque
bar actuating arm, form the rear section of the actua-
ting wire to provide an overthrow stop for the wire
(Figure 22.1). See the I/O Printer Reference Man-
ual for the specific adjustments.
Tab
Form Down Here
tr....r-~=-=-'----rt~
Tab Micro Switch
Figure 21.0
21.4 S. H. C5 AND C6 CO NT ACT SHIELD
In order to prevent contamination such as dirt, oil,
and grease from entering C5 and C6 contacts, a
shield has been provided. The new shield, PN
1159536, will be included 'in all future production
I/O Pri nters •
This shield may be field installed if a new mainspring
assembly is used since the old mainspring assembly
would interfere with its installation. The new main-
spri ng assemb Iy may be ordered under PN 1164342.
The contact shie Ids may be insta lied under the present
contact mounti ng screws.
These shields should be used whenever a service call
or machine malfunction arises due to contact contam-
ination.
Part No.
1159536
1164342
Description
Shie Id, Contact
Mainspring Assembly
21.5 Contact Timings may be set with a meter. (See ap-
plicable Systems Reference Manual.)
To detect contact bounce ora marginal bridging con-
dition a scope must be used.
SELECTRIC I/O PRINTER TOO LS AND
REFERENCE MATERIAL
22.0 SELECTRIC I/O PRINTER TOOLS AND REFERENCE
MATERIAL
4-27
It is necessary to have the proper tools, reference ma-
terial, and parts catalogs to properly service the Se-
lecti c I/O Pri nter •
The following is the list of the required tools. These
tools shou Id be used even though simi lar tools are
available as standard issues, since OP has supplied
us with "special" thin wrenches for work in difficult
areas.
Part No. Qty. Description
* 158645
450813
450818
452798
* 460870
1145391
1280441
1280442
1280443
1280444
9900005
9900028
*9900034
*9900059
*9900060
9900061
9900090
9900103
9900105
9900210
9900216
9900111
9900112 '
9900173
9900190
9900200
9900208
9900255
1
1
1
1
1
1
1
1
2
1
1
1
1
1
2
Grease Gun
Grease Gun Nozzle - cycle
clutch
Screwdriver' 8"
Keybutton Removal Tool
Scale (Rotate Tension)
Hand Cycle Wheel
1/2 oz. tube - IBM #23
1 lb. can - IBM #23
4 oz. can - IBM
#10
1 pint can - IBM
#10
Wrench 1/4" x 5/16" (Special)
6 Flute Wrench #4 (Rotate Pulley)
Oiler for IBM #10
Spring Hook
Screw Starter
5/16" Spintite
3/4" x 5/8" Wrench (pin feed
plate)
6 Flute #10 Wrench (Cycle Clutch)
Small Spring Hook
Spring Hook (Spring Holding)
6 Flute Wrench #2 (Gearless Tilt)
1/8" x 5/32" Wrench
Hooverometer
4 Flute Wrench #2 (Cl-C2)
T -Bender (Form pushers)
6 Flute #6 Wrench
3/16" x 7/32" Wrench
6 Flute Wrench #133
*If these tools are already included in the standard
tool issue, they need not be ordered.