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I have these models but never encountered this issues so far. Try checking the main switch. You know this are tact switch and any misalignment can press the button and shuts down the machine. The...

You require a Cisco Modem. Turns digital signal to analog. Install it then make an adjustment on the Call Manager and it will be fine.

i worked on sharp machines before. and now im working on ricoh machines colored & black and white. hope i can share some useful info with you guys.