Sharp AR-M256 Operation Manual page 98

Connectors
Caution:
This connector is only intended for service purposes.
Any connection to this terminal may cause malfunctions
of the copy machine.
Instruction for service technician:
The cable length for the service terminal has to be less
than 3 m (10 feet).
RSPF connector Finisher connector
LUOKAN 1 LASERLAITE
KLASS 1 LASERAPPARAT
Parallel connector
USB connector
CLASS 1
LASER PRODUCT
LASER KLASSE 1