Epson AcuLaser C4200DN User Manual page 308

6. Hold the ROM module above the slot and insert it into the slot
A in the orientation shown below, until the clip comes up to
hold the ROM module securely in place.
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Installing Options
Caution:
❏ Do not apply too much force.
❏ Be sure to insert the ROM module in the correct
direction.
❏ Never remove the ROM module installed on the
standard ROM slot P.