IBM 4247, Maintenance Information

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When you grasp and attempt to move it, the carriage shaft is correctly adjusted if it turns freely but does not
click at the frame. Ensure both screws that secure the carriage shaft retainer are tight.
To achieve the correct adjustment, loosen the 2 screws of the carriage shaft retainer to relieve the bind.
Bias the carriage shaft retainer toward the lower carriage shaft retainer screw (the 5 o’clock position), and
retighten the screws.
3. Verify the correct mounting of the platen.
a. Grasp and attempt to move up and down the left end of the platen.
b. If you hear a clicking where the bearing goes into the frame, loosen and tighten the bearing retainer-plate
screws, while biasing the retainer toward the lower screw (the 5 o’clock position).
c. Retighten the 2 screws, and verify there is no clicking when you grasp the carriage shaft and attempt to
move it up and down.
4. Verify the initial alignment of the wheel by following these steps:
a. Rotate the wheel to the full-open gap position.
b. With the mechanical stop at the left end of the carriage shaft resting against the frame, the pointer of the
wheel should be in the range of 3 to 4 numbers higher than 6 (at about 9 or 10). This approximate setting
will vary from printer to printer.
If it is not in this range:
1) Loosen the 2 screws that hold the wheel.
2) Pull the gear away from the intermediate gear.
3) Move only the wheel to align the pointer with a number in the range of 9 to 10.
5. Verify that the printhead mounting screws are tight, and that the printhead is seated correctly. If the printer had
’56/056’ errors, or printhead has been hitting the side wall of the printer:
a. Inspect the 2 printhead screws and 2 washers for damage. Replace any damaged screw or washer.
b. Loosen the 2 printhead screws.
c. Hold the printhead toward the platen.
d. Tighten both screws.
Chapter 5. Removals and Adjustments
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