Is it safe to disassemble the laser scanner unit myself?
No — do not disassemble the laser scanner unit under any circumstances. Although the printer is classified as a Class 1 laser product, the laser scanner unit contains a Class 3B laser beam source that can cause eye injuries if exposed. No adjustment to the laser scanner unit can be made in the field. (Page 12)
From the official Canon LBP1238 Ii Printer manual, page 12
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