Sharp MX 3501N - Color Laser - Copier, Service Manual

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MX3500N SELF DIAG AND TROUBLE CODE 8 – 25
L8-01 No full wave signal
L8-02 Full wave signal width abnormality
L8-20 Power controller communication
trouble
PC--- Personal counter not installed
U1-01 Battery trouble
U2-00 EEPROM read/write error
(MFP detection)
U2-05 HDD/Flash/EEPROM data discrepancy
U2-10 SRAM user authentication index
check sum error
U2-11 EEPROM check sum error
(MFP detection)
U2-22 SRAM memory check sum error
Trouble content No full wave signal is detected.
Section PCU
Case 1 Cause Harness trouble
Check and
remedy Check connection of the harness and the
connector.
Case 2 Cause Power unit trouble
Check and
remedy Replace the power unit.
Case 3 Cause PCU PWB trouble
Check and
remedy Replace the PCU PWB.
Trouble content The full wave signal is judged as frequency
abnormality. (The detection frequency is judged as
65Hz or above or 45Hz or less.)
Section PCU
Case 1 Cause Harness trouble
Check and
remedy Check the harness and the connector connection.
Case 2 Cause Power unit trouble
Check and
remedy Replace the power unit.
Case 3 Cause PCU PWB trouble
Check and
remedy Replace the PCU PWB.
Trouble content Communication establishment error/Framing/
Parity/Protocol error
Section MFP
Case 1 Cause Connector connection trouble between the mother
board PWB and the MFPcnt PWB.
MFPcnt PWB mother board connector pin
breakage
Check and
remedy Check the connector connection between the
mother board PWB and the MFPcnt PWB. Check
grounding of the machine.
Case 2 Cause Mother PWB trouble
Check and
remedy Replace the mother PWB.
Case 3 Cause Mother PWB jumper error
Check and
remedy Set the mother PWB jumper to the Default side.
Trouble content The personal counter is not installed.
Section MFP
Case 1 Cause The personal counter is not installed.
Check and
remedy Install the personal counter.
Trouble content Backup SRAM battery voltage fall
Section MFP
Case 1 Cause 1) Battery life
2) Battery circuit abnormality
Check and
remedy Check that the battery voltage is about 2.5V or
above.
Trouble content EEPROM device read/write error
Section MFP
Case 1 Cause EEPROM device trouble
Check and
remedy Replace the EEPROM device.
Case 2 Cause EEPROM device contact failure
Check and
remedy Check that EEPROM device is properly inserted.
Case 3 Cause Device access error due to electrical noises
Check and
remedy Replace the MFPcnt PWB.
Trouble content A HDD or Flash memory for user authentication
different from that used before turn off the power is
installed.
Section MFP
Case 1 Cause HDD replacement or Flash memory replacement
Check and
remedy Initialize the authentication information with
SIM16, and import the backup data (exported
data) if any.
Trouble content User index information (basic data of user
authentication) check sum error on the SRAM
Section MFP
Case 1 Cause 1) SRAM trouble
2) Hang-up of the control circuit due to electrical
noises
3) MFPcnt PWB SRAM access circuit trouble
Check and
remedy Use SIM16 to cancel U2 trouble.
Trouble content Counter information check sum error on the
EEPROM
Section MFP
Case 1 Cause 1) EEPROM device trouble
2) EEPROM device contact failure
3) Device access error due to electrical noises
Check and
remedy Use SIM16 to cancel U2 trouble.
Trouble content MFPcnt PWB SRAM memory check sum error
Section MFP
Case 1 Cause SRAM trouble
Check and
remedy 1) Initialize the communication management
table registered in SRAM and the FAX soft
switch.
2) Since the registered contents have been
deleted, register them again.
Case 2 Cause Control circuit hang-up due to electrical noises
Check and
remedy Use SIM16 to cancel U2 trouble.
Case 3 Cause MFPcnt PWB SRAM access circuit trouble
Check and
remedy Replace the MFPcnt PWB.