d-Color MF4003/MF3303
L TROUBLESHOOTING > 17. IC PROTECTOR
L-155
(b)IC with over current protective function
ICP No. Symbol Target part name When over current protective function works
Symptom in each load Trouble code and
others
IC12 USBHB USB hub board No operation -
IC13 - Authentication unit Unable to detect authentication unit
"Cannot find the connection with authentication
unit. Turn OFF/ON the main power switch after
the connection is found." display
-
IC69 IR CIS CIS module No operation -
IC70 IR CIS CIS module No operation -
DF CIS DF CIS module No operation -
IC73 WLANB Wireless LAN board Extension network adapter installation error CD262
IC76 FAXB FAX board FAX board error 5 (No fax board is installed.
Mistake in installation. Defective HW.)
CB005
IC77 - Control panel Control panel power not turned ON -
IC79 - Vendor Unable to detect vendor
"Turn ON the power of the vendor" display
-
IC1E USBHB USB hub board Unable to detect USB memory -
(2)DC power supply
(a)ICP
ICP No. Symbol Target part name When ICP trips
Symptom in each load Trouble code and
others
F101 - DC power supply circuit No operation -
FU101
F102 - Heater circuit The heater does not light up C3425
C3825
C3826
C3922
C3925
C3926
C392B
FU181
(3)High voltage unit
(a)ICP
ICP No. Symbol Target part name When ICP trips
Symptom in each load Trouble code and
others
F101 - • Charging and developing DC circuit
• Developing AC circuit
• Transfer circuit
Faulty image -
(4)DF control board
(a)ICP
ICP No. Symbol Target part name When ICP trips
Symptom in each load Trouble code and
others
ICP1 - 3.3 V regulator in the DF control board No operation -
ICP2 - 5 V DC/DC converter in DF control
board
No operation -
ICP3 PS19 Document empty sensor No operation -
17.2.2PF-P20/PF-P21
(1)PC control board
(a)ICP
ICP No. Symbol Target part name When ICP trips
Symptom in each load Trouble code and
others
F1 M1 Drive motor Tray 2 drive motor malfunction C0103
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