IBM 6400 Series, Maintenance Information Manual

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Chapter 7
Section I: Replacement Procedures
Magnetic Pick-up (MPU) Assembly
Removal
1. Prepare the printer for maintenance (page 152).
2. Remove the shuttle cover (page 203).
3. Disconnect the shuttle cable assembly connector (page 272, Figure 49).
4. Disconnect the magnetic pick-up (MPU) cable connector (page 272,
Figure 49).
5. Loosen the 7/64 inch hex MPU clamp screw (page 272, Figure 49).
6. Unscrew the MPU assembly from the MPU bracket.
Installation
1. Install the MPU assembly by screwing it into the MPU bracket (page 272,
Figure 49).
2. Using a feeler gauge, adjust the gap between the MPU assembly and the
flywheel to 0.010
±
.001 inch (0.254
±
0.025 mm). Torque the MPU clamp
screw to 19
±
1 inch-pounds (2.15
±
0.11 N•m).
3. Check the gap between the MPU assembly and the flywheel with a feeler
gauge:
a. If the gap is 0.010
±
.001 inch (0.254
±
0.025 mm), go to step 4.
b. If the gap is not 0.010
±
0.001 inch (0.254
±
0.025 mm), loosen the
MPU clamp screw and go back to step 2.
ATTENTION
Make sure the MPU cable is below the extension spring and does not
touch the spring after the cable is connected.
4. Connect the magnetic pick-up (MPU) cable connector.
5. Connect the shuttle cable assembly connector (page 272, Figure 49).
6. Install the shuttle cover (page 203).
7. Adjust the hammer phasing (page 173).
8. Return the printer to normal operation (page 153).