Printronix P4280, Maintenance Manual

Page: 116 / 298

5–34 Replacement Procedures
Magnetic Pick–up (MPU) Assembly (Figure 5–14 )
Removal
1. Prepare the printer for maintenance (page 5–3).
2. Remove the shuttle cover (page 5–24).
3. Disconnect the magnetic pick–up (MPU) cable connector (1).
4. Loosen the 7/64 inch hex MPU clamp screw (2).
5. Remove the MPU assembly (3) by unscrewing it from the MPU bracket
(4).
Installation
1. Install the MPU assembly (3) by screwing it into the MPU bracket (4).
2. Using a feeler gauge, adjust the gap between the MPU assembly (3) and
the flywheel (5) to 0.010
±
.001 inch. Torque the MPU clamp screw (2)
to 19
±
1 inch–pounds.
3. Check the gap between the MPU assembly (3) and the flywheel (5) with
a feeler gauge:
a. If the gap is 0.010
±
.001 inch, go to step 4.
b. If the gap is not 0.010
±
0.001 inch, loosen the MPU clamp
screw (2) and go back to step 2.
CAUTION
In the next step, route the MPU cable under the extension spring and
make sure it does not touch the spring after cable connection.
4. Connect the magnetic pick–up (MPU) cable connector (1).
5. Install the shuttle cover (page 5–24).
6. Adjust the hammer phasing (page 4–6.)
7. Return the printer to normal operation (page 5–86).