Full Wave Signal Width Abnormality; Battery Trouble - Sharp MX-3500N Service Manual
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L8-01
No full wave signal
Trouble content
No full wave signal is detected.
Section
PCU
Case 1
Cause
Harness trouble
Check and
Check connection of the harness and the
remedy
connector.
Case 2
Cause
Power unit trouble
Check and
Replace the power unit.
remedy
Case 3
Cause
PCU PWB trouble
Check and
Replace the PCU PWB.
remedy
L8-02
Full wave signal width abnormality
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
Check the harness and the connector connection.
remedy
Case 2
Cause
Power unit trouble
Check and
Replace the power unit.
remedy
Case 3
Cause
PCU PWB trouble
Check and
Replace the PCU PWB.
remedy
L8-20
Power controller communication
trouble
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
Check the connector connection between the
remedy
mother board PWB and the MFPcnt PWB. Check
grounding of the machine.
Case 2
Cause
Mother PWB trouble
Check and
Replace the mother PWB.
remedy
Case 3
Cause
Mother PWB jumper error
Check and
Set the mother PWB jumper to the Default side.
remedy
PC---
Personal counter not installed
Trouble content
The personal counter is not installed.
Section
MFP
Case 1
Cause
The personal counter is not installed.
Check and
Install the personal counter.
remedy
U1-01
Battery trouble
Trouble content
Backup SRAM battery voltage fall
Section
MFP
Case 1
Cause
1)
Battery life
2)
Battery circuit abnormality
Check and
Check that the battery voltage is about 2.5V or
remedy
above.
MX3500N SELF DIAG AND TROUBLE CODE 8 – 25
U2-00
EEPROM read/write error
(MFP detection)
Trouble content
EEPROM device read/write error
Section
MFP
Case 1
Cause
EEPROM device trouble
Check and
Replace the EEPROM device.
remedy
Case 2
Cause
EEPROM device contact failure
Check and
Check that EEPROM device is properly inserted.
remedy
Case 3
Cause
Device access error due to electrical noises
Check and
Replace the MFPcnt PWB.
remedy
U2-05
HDD/Flash/EEPROM data discrepancy
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
Initialize the authentication information with
remedy
SIM16, and import the backup data (exported
data) if any.
U2-10
SRAM
user
check sum error
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
Use SIM16 to cancel U2 trouble.
remedy
U2-11
EEPROM check sum error
(MFP detection)
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
Use SIM16 to cancel U2 trouble.
remedy
U2-22
SRAM memory check sum error
Trouble content
MFPcnt PWB SRAM memory check sum error
Section
MFP
Case 1
Cause
SRAM trouble
Check and
1)
Initialize the communication management
remedy
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
Use SIM16 to cancel U2 trouble.
remedy
Case 3
Cause
MFPcnt PWB SRAM access circuit trouble
Check and
Replace the MFPcnt PWB.
remedy
authentication
index
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