AR-156. AR120E 121E 150 151 155 156 F151 - Sharp Copying Equipment Handy Guide. Page 22

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The AR-150/151/155 & AR-120E supply 5vdc and 24vdc to the document feeder.

All of the switches and sensors utilise DC voltages to operate.  A source voltage of
24VDC is used to supply the motors, solenoids, and switches within the document
feeder while 5VDC is used by the various photo-detectors.

SPID is used to detect the presence of a document within the paper feed unit, and
SPPD
detects document feed. There are no adjustments  available for the  sensors. The
SPF motor SPFM is a DC stepping motor.

Adjustments may be required to the SPF lead edge position (Sim50-01)

The AR-FX3 is a similar unit to the AR-SP3 in its operation
However, this unit contains the Fax option.

The R-SPF works in a similar way to the SPF. There is a gate which inverts the
original when Duplex copying is being carried out for 2

nd

 side copying