Magnetic Pickup Phasing Adjustment - Printronix P9012 Maintenance Manual

Magnetic Pickup Phasing Adjustment

NOTE: Unless otherwise directed, perform the MPU gap adjustment (page
NOTE: The quality of the phasing adjustment will be affected by the
1. Loosen the screw (1) until the MPU arm (2) can be pivoted, but only
with some effort.
2. Load the printer with 14 7/8 inch wide, single–part paper.
3. Refer to the P9012 User's Manual and command a 132 column self–test,
printing all "H's." Observe the printout. The relative horizontal position
of dots in alternate rows should be as shown below. If either incorrect
condition is observed, position the MPU arm until the dots in succeeding
rows are aligned horizontally to within 0.005 inch.
NOTE: To precisely set the MPU phase, a long–shanked screwdriver or
4. Position the MPU arm so that the dots in alternate rows are aligned to
within 0.005 inch. Tighten the screw (1). Repeat the printout and readjust
the MPU arm as necessary.
5. Return the printer to normal operation.
5–22
5–20) before proceeding.
condition of the shuttle bearings. If they have been tampered with or
damaged, the shuttle assembly should be returned for repair.
Needs Correct
Alignment
Allen wrench shaft may be used as a pry bar with the bracket arms
as a fulcrum.
(Figure 5–9)
Needs
Alignment
Alignments and Adjustments