IBM 4247 Maintenance Information page 283

Quick AFTA Service Check and Adjustment
This 'quick' AFTA Service Check can be used to verify the correct print gap on new printers and mechanisms NOT
yet disassembled. If a printer has been disassembled, the "Power Off Check" on page 286, should be used first to
verify that all the hardware is mounted and working correctly. The result of successful completion with this 'Quick'
procedure will be that when a 1-part paper is loaded:
1. For either the AFTA=0 or FIXED=1 modes, the AFTA Wheel will go to the SAME position.
2. You will have verified good PQ along with good paper feeding and carriage motion.
3. The Wheel position may NOT be on number '1'.
This 'Quick' AFTA Service Check can replace these 3 AFTA Service Check sections:
v "Power On Check" on page 289
v "Print Quality Check" on page 291
v "Gap Check" on page 293
But, if the result of this 'Quick' AFTA Service Check is NOT good, you must go through the 4 sections of the
Standard AFTA Service Check and Adjustment procedures (see Standard AFTA Service Check and Adjustment) to
understand some problems. Follow these steps to perform the 'Quick' AFTA Service Check:
1. Check that the print head is mounted securely with the socket head screw, star washer and thick flat washer.
Spares are available (5 sets) with P/N 02N7555.
2. Check the print needles. Clean the ink build-up from the white surfaces around the needles with a dry cloth or
toothbrush.
3. Check that the print head is installed squarely against both mount blocks in the carriage. It is not necessary to
overtighten the socket head screws.
4. First, determine Estimate A by finding the AFTA Wheel position number that lets 1-part paper slide between
the carriage and platen.
a. Setup: Remove the front tractor and the bail assembly. Using the AFTA Wheel, open to the full open gap
position. Using the upper feed rollers, rotate until the WHITE dot on the left end of the platen is aligned
with the frame WHITE mark. Slide the carriage assembly to the AFTA position near the left end of the
platen.
Chapter 5. Removals and Adjustments
283