Epson AcuLaser C8600 Reference Manual page 247

3. Identify the ROM slots.
4. Insert the module firmly into slot A or B, as shown below.
Caution:
c
Do not force the ROM module into the slot.
Be sure to insert the module facing the correct way.
You should not remove any modules from the circuit
board. Otherwise, the printer will not work.
ROM slots
Using Options
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7
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