Shuttle And Counterweight Spring Adjustment - Printronix

P9212 Maintenance Manual

Shuttle and Counterweight Spring Adjustment

NOTE: You can make force adjustments with or without a force gauge. The
1. Open the printer cover.
2. Loosen two captive screws (1) and remove the cam cover (2).
3. Inspect the area around the shuttle spring (3) and the counterweight
spring (4) for broken or loose shims. Replace loose shims per Steps 6
and 7 below.
4. Turn the printer on. Run the printer using a shuttle/ribbon test to keep the
shuttle moving.
5. Loosen screw (8) about three turns. With the screwdriver, press in on the
loosened screw to apply heavy pressure to the right side of the
counterweight (5). Check for rattle.
a. If the rattle does not change, go to Step 6.
b. If the rattle decreases, go to Step 7.
6. Install a 0.01 inch shuttle spring shim as follows:
NOTE: More than one shim may be required to obtain the desired effect.
a. Turn the printer off.
b. Use a screwdriver to pry the spring away from the yoke (6).
c. Insert a shim (7) and press down until it is flush with the yoke.
5–32
procedure on page 5–28 describes the use of a force gauge and is the
preferred method. Although the procedure below is not
recommended, you can do it if excessive rattle is detected under the
cam cover and you are unable to do the procedure on page 5–28.
(Rattle under the cam cover indicates incorrect spring force, which
can effect print quality.)
(Figure 5–13)
Adjustments