Ricoh OP-P1 Service Training page 86

 When toner runs out, the AIO can be refilled by the service
technician or the AIO can be replaced by the operator.
 Refilling requires removal of two caps: the square cap to dump
the toner and the round cap for refilling.
 Refilling can be done in all models except the the Europe and N.
America models: M145, M146, M147, M148, M149, M150, and
M151.
Slide 86
No additional notes
AIO Replacement - 1
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OP-P1/MF1 Training