Specifications

5–28
Adjustments
Shuttle and Counterweight Preload (Figure 5–12)
NOTE: Set shuttle and counterweight preload when improper shuttling
action or excessive rattle is detected, or whenever shuttle drive
components have been replaced.
1. Disconnect the AC power cord from the rear of the printer. Open the
printer cover.
2. Remove the ribbon deck assembly. (See page 5–2.)
3. Loosen two captive screws (1) and remove the cam cover (2).
(Figure 5–12, detail A.)
4. Remove six screws (3) and the cam front cover plate (4).
5. Remove the dust barrier (5).
6. Insert force gauge (6) in the hole in the counterweight (7). (Figure 5–12,
detail B.)
7. Insert a 0.003 inch flat feeler gauge (8) between the cam (9) and the right
cam follower (10).
8. Pull the force gauge horizontally to the right. Note the gauge indication
when the feeler gauge comes loose.
a. If the indication is between 12 and 17 pounds, go to Step 9.
b. If the indication is less than 12 pounds, install a shuttle spring shim
as described on page 5–32 and repeat Steps 6. through 8.
c. If the indication is greater than 17 pounds, remove a counterweight
spring shim and repeat Steps 6. through 8.
9. Insert a 0.003 inch flat feeler gauge (8) between the cam (9) and the left
cam follower (11).
10. Press the rod end of the force gauge against the cam follower yoke (12),
positioning the gauge as close to parallel with the shuttle shaft as
possible. (Figure 5–12, detail C.)