Hammerspring Assembly, Version 3 - Printronix P8000 SERIES Maintenance Manual

Chapter 4
Platen Gap Adjustment

Hammerspring Assembly, Version 3

1. Prepare the printer for maintenance (page 178).
2. Remove the ribbon cartridge and paper. (Refer to the User's Manual.)
3. Remove the shuttle cover assembly (page 235).
4. Loosen the platen open belt (page 182, steps 2, 3, and 4).
5. Rotate the platen stop knob until the pointer is aligned with "A" on the
forms thickness label.
6. Raise the platen lever 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 hammerbank. Damage to the hammer
tips will result.
7. Insert the flat feeler gauge approximately 1.5 inches straight down
between the hammerbank cover plate and ribbon mask, 1 inch from the
left end of the hammerbank.
NOTE: Insert the feeler gauge no more than 2 inches down from the top
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.
8. Gently close the platen lever all the way. Gently slide the feeler gauge up
and down, keeping it between the hammer tip and ribbon mask. If the feel
is too tight use the next feeler guage. With the platen 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 hammerbank.
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 182).
12. Install the shuttle cover assembly (page 235).
13. Install the ribbon cartridge. (Refer to the User's Manual.)
14. Check the hammer phasing adjustment (page 192).
15. Return the printer to normal operation (page 179).
188
of the ribbon mask.