Shuttle And Counterweight Preload - Printronix

P9212 Maintenance Manual

Shuttle and Counterweight Preload

NOTE: Set shuttle and counterweight preload when improper shuttling
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 the 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 12–17 pounds, go to Step 9.
b. If the indication is less than 12 pounds, install a shuttle
c. If the indication is greater than 19 pounds, remove a counterweight
9. Insert a 0.003 inch flat feeler gauge between the cam 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.)
5–28
action or excessive rattle is detected, or whenever shuttle drive
components have been replaced.
counterweight shim as described on page 5–32 and repeat Steps 6.
through 8.
spring shim and repeat Steps 6. through 8.
(Figure 5–12)
Adjustments