Fax Modem Operation Abnormality; Fax Write Protect Cancel; Abnormal Combination Of The Tel/Liu Pwb And The Fax Soft Switch; Fax-Box Incompatibility Trouble - Sharp MX-M550U Service Manual

F6-04

FAX modem operation abnormality

Details The initializing process of the modem chip in the
FAX PWB is not completed normally.
Section FAX
Case 1 Cause SW101 in the FAX PWB tries to perform normal
operation on the boot side.
Check and Set SW101 on the FAX PWB to other than the
remedy boot side, and turn on the power again.
Case 2 Cause FAX PWB modem chip operation trouble
Check and Replace the FAX PWB.
remedy
F6-20

FAX write protect cancel

Details The write protect jumper of the FAX interface
PWB is released.
Section FAX
Case 1 Cause The FAX write protect pin is set to Write Enable.
Check and Check the write protect pin in the FAX interface
remedy PWB.
Case 2 Cause FAX interface PWB trouble
FAX PWB trouble
Check and Replace the FAX PWB.
remedy Replace the FAX interface PWB.
F6-21 Abnormal combination of the TEL/LIU
PWB and the FAX soft switch
Details Combination error of TEL/LIU PWB and software
If the destination of the installed TEL/LIU PWB
differs from that of the FAX soft switch, it is judged
as an error.
Or when the TEL/LIU PWB is not a new one for a
new MDMC PWB.
Section FAX
Case 1 Cause The destination of the installed TEL/LIU PWB
differs.
The FAX PWB information (soft switch) differs.
Check and Check the destination of the TEL/LIU PWB.
remedy Check the FAX PWB information (soft switch).
Case 2 Cause TEL/LIU PWB trouble
Check and Replace the TEL/LIU PWB.
remedy
Case 3 Cause The TEL/LIU PWB is not a new one.
Check and Replace the TEL/LIU PWB with a new one.
remedy
F6-97

FAX-BOX incompatibility trouble

Details The FAX-BOX PWB is not one for the main unit.
(FAX detection)
If the FAX-BOX modem controller PWB
information (hard detection) is not for the main
unit, it is judged as an error.
Section FAX
Case 1 Cause Because the FAX-BOX modem controller PWB
information (hard detection) is not for the main
unit.
Check and Check the FAX-BOX modem controller PWB.
remedy Replace it with a modem controller PWB for the
main unit.
MX-M700N SELF DIAG AND TROUBLE CODE 8 – 16
F6-98 Combination error of the FAX-BOX
destination information and the
machine destination information
Details When the destination information stored in the
FAX-BOX EEPROM is compared with that of the
machine, and if the combination is improper, it is
judged as an error.
Section FAX
Case 1 Cause Because of improper combination between the
destination information stored in the EEPROM on
the FAX-BOX PWB and that of the machine
(set with SIM 26-6).
Check and Check the destination of the FAX-BOX.
remedy Check the machine destination with SIM 26-6.
Use a proper combination of the machine and the
FAX-BOX.
F7-01 FAX board EEPROM read/write error
Details ACK from the EEPROM cannot be checked.
Section FAX
Case 1 Cause EEPROM trouble FAX PWB EEPROM access
circuit trouble
Check and Replace the EEPROM.
remedy Re-setup the soft SW.
H2-00 Thermistor open/Fusing unit not
installed (HL1)
Details Thermistor open
(An input voltage of 4.6V or above is detected.)
Fusing unit not installed
Section Engine
Case 1 Cause Thermistor trouble.
Control PWB trouble Improper connection of the
fusing section connector.
AC power trouble.
Fusing unit not installed.
Check and Check the harness and the connector between
remedy the thermistor and the control PWB.
Use SIM 14 to clear the self diag display.
H2-01 Thermistor open/Fusing unit not
installed (HL2)
Details Thermistor open
(An input voltage of 4.6V or above is detected.)
Fusing unit not installed
Section Engine
Case 1 Cause Thermistor trouble
Control PWB trouble Improper. connection of the
fusing section connector.
AC power trouble.
Fusing unit not installed.
Check and Check the harness and the connector between the
remedy thermistor and the control PWB.
Use SIM 14 to clear the self diag display.