IBM Selectric Service Manual

will slightly affect the adjustment at the other end. Be
sure to recheck each adjustment.
Anvil
Frame
Power
______________ ~*
Frame
Buffer
Anvil
Locking
Screws
FIGURE 96. Carrier Buffers (15 Inch Machines)
8. Carrier Buffers - A buffer plate attached to the right side
of the carrier and an adjusting screw under the left side
strike
the top of the anvil to prevent the print shaft from
flexing downward. Each should have .002" to .004"
clearance with the top of the anvil (Fig. 96).
9. Print Cam Follower
a. Print Cam Follower Stud - Adjust the pivot stud
left or right so
that the rubber roller on the follow-
er is centered on the surface of the restoring cam.
The stud is held in place in the carrier by a set
screw that is accessible from the bottom of the ma-
chine.
b. Restori ng Cam Fo II ower Eccentri c - Wi th the pri nt
cam follower
at the high point of the cam and the
platen removed, hold the typehead toward the rear
until it is restri cted by the anvi I and striker. The
rubber roller should just touch
the restoring cam
(Fig. 97). Adjust the eccentric, keeping the high
_ point forward,
to satisfy the condition.
NOTE: If the roller is too close to the restoring
cam, it may bind against the cam during print shaft
rotation. If too much clearance exists, the type-
head may not be restored as quickly as it should and
blurred
characters may result.
10. Even Printing - Position the yoke under its mounting
screws so
that the density of the left and right sides of a
printer
character wi II be uniform.
Restore
Cam
1.
6.
Striker Aga inst Anvi I
FIGURE 97. Restoring Cam Follower Eccentric
Adjustment
CAUTION: This adjustment affects the ti It ring homing
adjustment, the typehead homing adjustment, and the
detent cam and actuating lever adjustments (skirt clear-
ance). Be sure to check these after changing the posi-
ti on of the yoke.
PRINT MECHANISM - LATE STYLE (STICK SHIFT)
Adjustments one through five remain exactly the same as
they appear on the early style print mechanism. After
completing these five adjustments, begin here with ad-
justment number six.
Carrier Support (long carriage machines) - Adjust both
ends of the support vertically to maintain .001" to .004"
clearance with the bottom of the ribbon feed bracket
along the entire length of the writing line (Fig. 97.1).
.001" To .004"
!
t
FIGURE 97. I Carrier Support (Long Carriage Machines)
2-31

IBM Selectric Specifications

General

Type	Electric typewriter
Introduced	1961
Keyboard Layout	QWERTY
Carriage Return	Electric
Manufacturer	IBM
Printing Technology	Typeball (golf ball)
Power Source	AC Power
Power Supply	120V AC

Summary

Section 1. Lubrication

GENERAL PROCEDURE

Outlines initial steps for cleaning and inspecting the printer before lubrication.

LUBRICATION

Details lubricant types and application methods based on machine usage and motion types.

Section 2. Adjustments

MOTOR AND DRIVE

Covers adjustments for drive belt, motor pulley, clutch pawls, and idler gears.

Selection Mechanism

Explains adjustments for latch bail shaft and plate alignment for proper selector operation.

Latch Bail Shaft

Details the specific adjustment procedure for the latch bail shaft plate to ensure proper cam contact.

Differential Guides

Covers the adjustment of rotate and tilt differential guides for vertical alignment of links.

Section 3. Removals

CYCLE CLUTCH AND CYCLE SHAFT REMOVAL

Step-by-step instructions for removing cycle clutch and cycle shaft components.

BELT REPLACEMENT

Procedures for replacing the drive belt on the cycle clutch and cycle shaft mechanism.

ROTATE SELECTION DIFFERENTIAL REMOVAL

Provides steps for removing the rotate selection differential assembly.

OPERATIONAL MAGNET ASSEMBLY REMOVAL

Instructions for removing the operational magnet assemblies.

Section 4. Service Index

BACKSPACE

Troubleshooting guide for backspace mechanism issues and related adjustments.

SPACING

Adjustments and troubleshooting flowcharts for spacing-related issues.

PRINT ESCAPEMENT

Diagnostic flowchart and adjustments for the print escapement mechanism.

Section 5. Console Reduced-Function Printing Unit

Lubrication

Specific lubrication points for modified components in the reduced-function unit.

Adjustments

Outlines the five key adjustments for the cycle clutch magnet assembly.

Cycle Clutch Magnet

Details the sequence and parameters for adjusting the cycle clutch magnet assembly.