Platen Gap Adjustment - Printronix P7000 Series Maintenance Manual

Chapter 4

Platen Gap Adjustment

Platen Gap Adjustment

IMPORTANT
Only do this procedure if the original equipment shuttle frame assembly
or platen was replaced by a new or refurbished unit, or if you were
instructed to in a troubleshooting procedure.
1. Prepare the printer for maintenance (page 230).
2. Remove the ribbon and paper. (Refer to the User's Manual .)
3. Remove the shuttle cover assembly (page 280).
4. Loosen the platen open belt (page 234, steps 2, 3, and 4).
5. Rotate the platen stop knob (1) until the white pointer is aligned with "A"
on the forms thickness label.
6. Raise the forms thickness lever (2) to the fully open position.
CAUTION
Do not force the platen against the feeler gauge and do not move the
feeler gauge laterally across the hammer bank. Damage to the hammer
tips will result.
7. Insert the flat feeler gauge (3) straight down between the hammer bank
cover plate (4) and ribbon mask (5), within four hammer positions of the
left end of the hammer bank.
CAUTION
Adjust the platen setscrews less than 1/4 turn on one side, then check
the other side. Adjustment sensitivity is approximately 0.03 inch per
revolution of the setscrew. Also, insert the feeler gauge no more than 2
inches down from the top of the ribbon mask.
8. Gently close the forms thickness lever (2) all the way. As the platen is
closing, gently slide the feeler gauge up and down, keeping it between the
hammer tip and ribbon mask. If the feel is too tight when the platen is
being closed, adjust the 3/32 inch setscrew (6) at the end of the platen
counterclockwise. If the feel is too loose, adjust the setscrew clockwise.
With the forms thickness lever closed all the way, the feeler gauge should
contact both the hammer tips and the ribbon mask and move with light
friction. Shift the gauge slightly to verify.
9. Repeat steps 6 through 8 at the right end of the hammer bank.
10. After adjusting both sides, check the gap again at both ends. Readjust if
necessary.
11. When the platen gap is correct at both ends of the platen, adjust the
platen open belt (page 234).
12. Install the shuttle cover assembly (page 280).
13. Install the ribbon. (Refer to the User's Manual .)
14. Check the hammer phasing adjustment (page 245).
15. Return the printer to normal operation (page 231).
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