Which of the following should a technician perform FIRST to resolve this issue?

A user having difficulty using a personal all-in-one printer. When the user scans a single-page document in flatbed mode, the scan appears correctly: however, when using the printer’s document feeder, the scan has a vertical line going across the page .

Which of the following should a technician perform FIRST to resolve this issue?
A . Replace The printer’s ADF
B . Install a pickup roller replacement kit.
C . Clean the separation pad.
D . Use a microfiber cloth to clean the glass.

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Answer: A