IBM 4247, Maintenance Information

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b. Test: Slide a sheet of 1-part paper up past the carriage. Using the AFTA Wheel, close to a very small gap.
The paper should be pinched by the carriage; it will NOT slide when pulled backwards. As you continue to
pull on the paper, begin to rotate the AFTA Wheel in small increments to open the gap. Notice the Wheel
position number where you can begin to pull the paper backwards. Close the gap again and repeat this a
few times until you agree on the Wheel position number where paper begins to slide with constant friction.
This Wheel position number is the minimum carriage to platen gap required for 1-part Paper Sliding.
c. Estimate A is defined by adding 0.5 to this Paper Sliding number.
5. Second, determine Estimate B by finding the AFTA Wheel position number that begins to give DARK printed
characters.
a. Setup: Install the front tractor, the bail assembly and a new or nearly new ribbon. Verify that the value in
T&D 12 is set to ’0’ and SAVE.
b. Test: Print Samples on blank 1-part paper at settings of FIXED = 1, 2, 3 and 4. Record the actual Wheel
position number along side the FIXED=X print sample. On Models 001, 002, and 003, use the TEST key
and Printer Adjustments, Front AFTA pattern. On the Model A00, use the Menu key, Print Out = Yes and
change using the Adjustments category, AFTA.
c. Estimate B is defined as the Wheel position number that is small enough to begin to make DARK printed
characters. Refer to the chart below. You should see the darkness of the characters change as the FIXED
value increases. If you get Example 1 or 2, use the Wheel position where DARK begins and proceed to
step 6. If you get Example 3, change the T&D 12 value from 0 to -4, to decrease the gap. Repeat the Print
Samples.
Table 45.
Character Print Quality and Result
Menu Setting Wheel Position # Example 1 Example 2 Example 3
Fixed 1 A DARK DARK LIGHT
Fixed 2 B LIGHT DARK Very Light
Fixed 3 C Very Light DARK
Fixed 4 D LIGHT
Chapter 5. Removals and Adjustments
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