XG-MB70X (serv.man13). Troubleshooting - Sharp Projector Service Manual (repair manual). Page 12

LAN communication is disabled even 
though connecting the control PC with a 
LAN cable. The LINK LED (green) does 
not light up.

Are the connection of connecting cable 
and the settings of IP address, sub-net 
address and default gateway correct?

Check the connecting cable and LAN settings. If the 
LAN settings are unknown, contact the network 
administrator.
If the network settings cannot be saved, replace 
IC8003 (EEP ROM) as it may be defective.

Note:  When IC8003 (EEP ROM) is replaced, the MAC 

address returns to default. Refer to "Resetting 
after replacing IC8003 (EEP ROM)" to reset.

Are the network device (e.g. Hub) 
between the control PC and XG-MB70X 
and cable normal?

Repair defective parts in the network.

When data is sent from the control PC, do 
pins (30) and (31) of IC8201 (PHY 
receiver) receive signals?

Check the peripheral circuit of J8201 (RJ-45 jack 
with built-in transformer).

Check the PHY receiver IC8201 and the 
peripheral circuits of the microprocessor 
IC8001.