Printronix P7000 Series Maintenance Manual page 257

8. Use the scale to pull the paper slowly straight up through the print station
for about six inches and note the maximum force exerted on the scale. Do
not pull any page perforations through the print station. (Figure 19.)
Figure 19. Measuring Paper Tension
9. Repeat steps 6 through 8 several times to get an average value of force
on the gauge.
10. The average tension should be 6 to 12 ounces for printers with one paper
ironer, and 9 to 15 ounces on printers with an additional auxiliary paper
ironer. If the average value is greater than 13 (or 16) ounces, paper
handling and print quality problems are likely.
11. If the average value is greater than 13 (or 16) ounces, check the platen
gap (page 238), adjust if necessary, and recheck the dynamic paper
tension.
12. If the platen gap is correct, remove the shuttle frame assembly (page 321)
and check the following:
a. Inspect the hammer bank cover assembly for ribbon debris, paper
debris, or other foreign matter. If the ribbon mask or hammer bank
cover is damaged or deformed, replace it.
b. Inspect the paper ironer for distortion or misalignment. Reposition or
replace it if necessary.
c. Make sure the paper guides are properly seated on the splined and
support shafts.
d. Make sure the paper entrance guide pivots freely with minimal down
force. Reposition the springs or the guide if necessary.
e. Check for correct position and function of the paper motion detector
assembly. Reposition or replace if necessary.
f. Inspect the paper path from above (below the paper ironer), and from
below (above the paper entrance guide), for debris, foreign matter, or
anything that could inhibit paper motion. Correct as necessary.
Adjustments and Tests
Scale
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