MX-6201N, MX-7001N (serv.man20). SELF DIAGNOSIS TROUBLE CODES SECTION - Sharp Copying Equipment Service Manual (repair manual). Page 30

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MX-7001N  SELF DIAG AND TROUBLE CODE  8 – 30
 
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/SRAM/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
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 SRAM memory for user authentication 
different from that used before turn off the power is 
installed.
Section
MFP
Case 1
Cause
HDD replacement or SRAM memory replacement
Check and 
remedy
Initialize the authentication information with SIM16, 
and import the backup data (exported data by 
device cloning) 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.
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