DP-MB251CX, DP-MB311EU, DP-MB311JT, KX-MB2571RU (serv.man2) - Panasonic Copying Equipment Service Manual Supplement (repair manual). Page 9

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9
DP-MB251CX/DP-MB311EU/DP-MB311JT/KX-MB2571RU
12.3.24. Wireless LAN Section                                                                                                             
                                                                                                                                                                      
Wireless LAN Block Diagram  (Can not use the WiFi)
15.4.10. WiFi Board
" NIC ERROR "
Check/Fix disconnection or short circuit between 
IC300 and IC901 (L800,  CN800, CN900, L902, R901, 
R902)
Replace the main board
Check materials around IC901.
( R901, R902, R903, R905, L902, L903, C900, C902, 
C903, C905, C906 )
NG
Replace IC901
Check/Modify Wireless LAN settings
(SSID, Key,etc)
NG
Replace IC901
NG
NG
NG
(Displayed with the NIC ERROR on the LCD.) 
NIC ERRER
3pin 3.3V?
Repair
Change
Main PCB board 
Is the  Voltege CN800  
5pin 3.3V
Change
WLAN PCB Board
Is the Shignal
OK?
Repair
Is the  signal 
2,3pin(USB) OK?
Replace IC300
Replace IC901
DISPLAY MASSEGE
Is the Voltage IC901
IC901 1,2pin(USB)
Check soldering 
of L903,R905,R455,R456,
R457,Q400,Q401
Disconnect CN800
Disconnect CN800
Check R901,R902,L902,L800
No
No
NG
No
NG
NG
OK
Yes
OK
OK
Yes
Yes
*The waveform, such as USB, nRST, please refer to the "Wave Form" of 6.22. WirelessLAN Section.

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