AR-M550 (serv.man22). ARM550 620 Circuit Diagrams - Sharp Copying Equipment Service Manual (repair manual). Page 9

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AR-555/550/620/625  BLOCK DIAGRAM / 
ブロック図
  2 - 5
3. SOFT NIC PWB / 
ソフト
NIC PWB
CN1
(to controller)
PCI-Bus
Ethernet
Controller
DP83816
IC1
CN3
LAN I/F
EEPROM
IC3
1Kbit
OSC
X1
25MHz
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