Setting Shuttle And Counterweight Preload; Hammer Spring Retensioning - Printronix p300 Maintenance Manual

5–6. Setting Shuttle and Counterweight Preload
b. Setting Preload Using Force Gauge
8. Prepare for power–up.
(a) Install paper and set Forms Thickness Lever to 6.
(b) Install shoulder screw per paragraph 5–27a.7.
(c) Partially install ribbon drive by performing steps 1 through 3 of paragraph 5–20b.
(d) Check MPU gap and adjust as necessary per paragraph 5–11. Do not adjust phasing.
(e) Connect power cord. Set POWER to ON.
9. Tip front edge of shuttle yoke (8) down (self–aligning followers only).
10. Cycle ON LINE until left cam follower (6) lines up with cam (4).
11. Tip front edge of shuttle yoke (8) up.
12. Cycle ON LINE until right cam follower (5) lines up with cam (4).
13. Check MPU phasing and adjust as necessary per paragraph 5–12.
14. Return to normal configuration by performing steps 7 through 13 of paragraph 5–27b and return-
ing ribbon drive to operating position per paragraph 3–4c, steps 8 and 9.
5–7. Hammer Spring Retensioning (Figure 5–5)
a. Print Too Light
1. Gain access to hammer bank by performing steps 1 through 5 of paragraph 3–4c.
2. Using tip of screwdriver, carefully bend tip of spring (1) away from shuttle (2).
3. Restore printer to normal operating configuration by performing steps 8 through 10 of paragraph
3–4c.
b. Print Too Dark
1. Remove hammer spring per paragraph 5–25a.
2. Grip spring (1) with long nose pliers so screw hole is just covered. Carefully bend spring (1) in a
direction away from the tip of hammer (3).
3. Install hammer spring per paragraph 5–25b.
5–12
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P300/P600 Corrective Maintenance