MX-3500N, MX-3501N, MX-4500N, MX-4501N (serv.man21). User's Guide (Supplied as pdf file on m c's Hard Disk Drive). - Sharp Copying Equipment User Guide / Operation Manual. Page 9

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8
CONNECTORS
(1)
USB connecter (A type)
This is used to connect a USB hub or USB memory 
device to the machine.
For the USB cable, use a shielded type cable.
(2)
USB connecter (B type )
A computer can be connected to this connector to use 
the machine as a printer.
For the USB cable, use a shielded type cable.
(3)
LAN connecter
Connect the LAN cable to this connector when the 
machine is used on a network.
For the LAN cable, use a shielded type cable.
(4)
Service-only connector
(5)
Extension phone socket
When the fax function of the machine is used, an 
extension phone can be connected to this socket.
(6)
Telephone line socket
When the fax function of the machine is used, the 
telephone line is connected to this socket.
When the fax expansion kit is installed
(1)
(2)
(3)
(4)
Caution
Connecting a cable to this connector may cause the 
machine to malfunction.
Important note for service technicians:
The cable connected to the service connector must be 
less than 3 m (118") in length.
(5)
(6)
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