IBM 4247 Maintenance Information page 182

Form
Perforation
Line
Tear Edge of Cover
Figure 16. Tear-Off Position. Only the earlier models had a serrated tear edge, as shown.
If the tear-off needs to be adjusted, press the Micro
Load/Form Feed key to move the paper down.
The range is -128 to +127. Each unit is approximately 0.2 mm.
When the tear-off is correct, go to the next step.
key to move the paper up, or press the
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Chapter 2. Diagnostics