IBM 4247, Maintenance Information

Page: 172 / 567

1. Adjust the print gap in 0.25 mm (0.001 in.) increments to achieve acceptable print darkness.
2. Initiate T&D12 (see “Running T&D12” on page 173).
3. Use STORE=NO.
4. Move the value to +x to increase the gap and -x to decrease the gap. This adjustment is described in
“Standard AFTA Service Check and Adjustment” on page 285.
5. After adjusting the gap to optimize the print quality, exit with STORE=YES.
6. Verify the gap between the printhead needles and the platen, as described in Standard AFTA Service Check
and Adjustment.
7. Verify the gap between the carriage casting and the platen, as described in Standard AFTA Service Check and
Adjustment.
55 AFTA Errors: If your printer is getting a 55 AFTA ERROR message that is caused by a bad #5B printhead
needle, the printer will display these messages:
v
During normal operation: With the AFTA=0 mode, you perform a paper load operation, but get a 55 AFTA
ERROR message.
- or -
v
During T&D12: With the AFTA=0 or the FIXED=1 mode, you begin the AFTA Calibration portion of T&D12, but
get the message TD12 FRU 3 [14].
To determine if the cause of the AFTA ERROR message is a bad #5B printhead needle, follow these steps:
1. Power off the printer and remove all paper from the printer.
2. Power on the printer and enter the operator menu to change to FIXED=1 mode.
3. Load 1-part paper and print some characters.
4. Examine the DP characters, such as an uppercase H, looking for missing dots. Count down 5 dots from the
top of the character to verify that the #5B needle is printing characters correctly.
5. Inspect the printhead cable for damage and a poor connection at the printhead. Replace the cable, if
indicated.
6. If the cable is OK, replace the printhead.
Chapter 2. Diagnostics
172