Intermec EasyCoder PF4i User Manual page 105

Chapter 9 — Maintenance
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2 Press the snap-lock, lift the outer end of the lower guide and
pull it out.
3 Check for anything blocking the beam of light, such as dust,
stuck labels, or adhesive residue. If necessary, clean the guides
using a cleaning card or a soft cloth soaked with isopropyl
alcohol. Do not use any other type of chemical.
Isopropyl alcohol [(CH-3)2CHOH; CAS 67-63-0] is a highly
flammable, moderately toxic, and mildly irritating substance.
4 After cleaning, reassemble in reverse order.
EasyCoder PF4i User's Guide (IPL Version)