Printronix p300 Maintenance Manual page 192

5–6. Setting Shuttle and Counterweight Preload (Figure 5–4)
a. Setting Preload Without Force Gauge
1. Verify you have access to the necessary area. If not, perform steps 1 through 4 of paragraph 5–5.
2. Rotate flywheel approximately 1/8 turn and observe whether counterweight cam follower makes
firm contact.
(a) If yes, go to step 3.
(b) If no, add shims per paragraph 5–5.
3. Gently rotate roller on left cam follower (6) while checking for rotation of cam (4).
4. Did cam (4) move?
(a) If yes, go to paragraph 5–5.
(b) If no, add shims per paragraph 5–5, step 7, until moving roller on cam follower (6) with
finger causes rotation of cam (4). Add up to three more shims, as needed, to ensure firm
contact of roller and cam.
5. Operate printer. Perform frequent stops and starts while checking for stalling. If stalling occurs,
remove one shim and recheck.
6. Perform steps 9 through 11 of paragraph 5–5.
b. Setting Preload Using Force Gauge (Figure 5–4)
1. Remove ribbon drive per paragraph 5–20a. Perform steps 1 through 6 of paragraph 5–17a to gain
access to equipment to be adjusted.
2. Insert force gauge (1) in hole in counterweight (2).
3. Insert 0.003 inch flat feeler gauge (3) between cam (4) and right cam follower (counterweight)
(5).
4. Gently pull force gauge (1) horizontally to right. Note force gauge indication when feeler gauge
(3) pulls free.
(a) If indication is between 10 and 16 pounds, go to step 5.
(b) If indication is less than 10 pounds, install counterweight spring shim per paragraph 5–5,
step 8, and repeat steps 2 through 4 above.
(c) If indication is greater than 16 pounds, remove a counterweight spring shim and repeat
steps 2 through 4 above.
5. Insert 0.003 inch flat feeler gauge (3) between cam (4) and left cam follower (hammerbank) (6).
6. Hook force gauge (1) on antirotation arm (7).
7. Gently pull force gauge (1) horizontally to left. Note force gauge indication when feeler gauge
(3) comes loose.
(a) If indication is between 10 and 16 pounds, go to step 8.
(b) If indication is less than 10 pounds, install shuttle spring shim per paragraph 5–5, step 7
and repeat steps 5 through 7 above.
(c) If indication is greater than 16 pounds, remove a shuttle spring shim and repeat steps 5
through 7 above.
5–10 P300/P600 Corrective Maintenance