Printronix p300 Maintenance Manual page 189

5–5. Shuttle Spring Force Adjustment (Figure 5–3)
Perform this procedure if there is excessive rattle under the cam cover. Un-
corrected excessive rattle can lead to damaged cam and bearing surfaces. If
this procedure does not correct the problem, set shuttle and counterweight
preload per paragraph 5–6.
1. Open front cover (1).
2. Loosen two screws (2).
3. Remove cam cover (3) and attached gasket (4).
NOTE: If you find broken shims, check for and remove any fragments still
wedged in spring area.
4. Inspect area around shuttle spring (5) and counterweight spring (6) for shims that may have bro-
ken or come loose. Replace any loose or broken shims per steps 7 and 8 below.
5. Set POWER to ON. Press ON LINE switch so shuttle operates. Cycle ON LINE as necessary to
keep shuttle moving or for continuous running use the method described in paragraph 5–3.
6. Apply heavy pressure to right side of counterweight (7) and check for rattle.
(a) If rattle decreases, install counterweight spring shim per step 8.
(b) If rattle does not change, apply pressure to shuttle. (On P300, push against antirotation
arm; on P600, push against frame.) If rattle decreases, install shuttle spring shim per step
7. If rattle does not change, look for other problems, such as damaged shuttle bearings.
7. Install shuttle spring shim (0.01 in) as follows:
Procedures for gaining access to shim mounting area differ. See Figure 5–3.
ON UNITS WITHOUT SELF–ALIGNING CAM FOLLOWERS:
(a) Set POWER to OFF.
(b) Pry spring (5) away from yoke (8) using screwdriver.
(c) Insert shim (9) carefully, making sure that shim legs do not straddle any other shims, and
press down until it is flush with yoke (8).
NOTE: More than one shim may be required to obtain desired effect.
P300/P600 Corrective Maintenance
CAUTION
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CAUTION
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5–7