Sharp MX-M620N

MX-M700N SELF DIAG AND TROUBLE CODE 8 – 21
U2-23 SRAM memory individual data check
sum error
U2-50 HDD section individual data check
sum error (MFP control)
U2-80 EEPROM read/write error (Scanner)
U2-81 Memory check sum error (Scanner)
U2-90 EEPROM read/write error (PCU)
U2-91 Memory check sum error (PCU)
U5-30 DSPF tray lift-up trouble
Details Check sum error for every individual data in SRAM
of the MFPC section when turning on the power
(If this error occurs, initialize the data related to the
check sum error. (Communication management
table, sender's information, etc.))
Section Controller
Case 1 Cause SRAM trouble
Check and
remedy
Automatically initialize the data related to the check
sum error by turning OFF/ON the power.
Since the registered data are deleted, register the
data again.
Case 2 Cause Control circuit runaway due to noises
Check and
remedy
Use SIM 16 to cancel the U2 trouble.
Case 3 Cause MFP control PWB EEPROM access circuit trouble
Check and
remedy
Replace the MFP control PWB.
Details Check sum error for every individual data in HDD
of the MFPC section when turning on the power
(If this error occurs, initialize the data related to the
check sum error. (One-touch, group, program,
etc.))
Section Controller
Case 1 Cause HDD write/read error
Check and
remedy
Automatically initialize the data related to the
check sum error by turning OFF/ON the power.
Since the registered data are deleted, register the
data again.
Case 2 Cause Control circuit runaway due to noises
Check and
remedy
Use SIM 16 to cancel the U2 trouble.
Case 3 Cause MFP control PWB HDD access circuit trouble
Check and
remedy
Replace the HDD.
Replace the MFP control PWB.
Details EEPROM communication trouble (NACK
detection) Retry 3 times
Section Scanner
Case 1 Cause EEPROM trouble
Check and
remedy
Check that the EEPROM is properly installed.
In the simulation to prevent against delete of the
counter data/adjustment values, write down the
counter/adjustment values.
Case 2 Cause Insertion of EEPROM which is not initialized
Check and
remedy
Use SIM 16 to cancel the U2 trouble.
Case 3 Cause Scanner PWB EEPROM access circuit trouble
Check and
remedy
Replace the scanner PWB.
Details When counter data sum error is detected.
Section Scanner
Case 1 Cause EEPROM trouble
Check and
remedy
Check that the EEPROM is properly installed.
In the simulation to prevent against delete of the
counter data/adjustment values, write down the
counter/adjustment values.
Case 2 Cause Control circuit runaway due to noises
Check and
remedy
Use SIM 16 to cancel the U2 trouble.
Case 3 Cause Scanner PWB EEPROM access circuit trouble
Check and
remedy
Replace the scanner PWB.
Details EEPROM communication trouble
(NACK detection)
Retry 3 times
Section Engine
Case 1 Cause EEPROM trouble
Check and
remedy
Check that the EEPROM is properly installed.
In the simulation to prevent against delete of the
counter data/adjustment values, write down the
counter/adjustment values.
Case 2 Cause Insertion of EEPROM which is not initialized
Check and
remedy
Use SIM 16 to cancel the U2 trouble.
Case 3 Cause PCU PWB EEPROM access circuit trouble
Check and
remedy
Replace the PCU PWB.
Details When POF data/counter data sum error is
detected.
Section Engine
Case 1 Cause EEPROM trouble
Check and
remedy
Check that the EEPROM is properly installed.
In the simulation to prevent against delete of the
counter data/adjustment values, write down the
counter/adjustment values.
Case 2 Cause Control circuit runaway due to noises
Check and
remedy
Use SIM 16 to cancel the U2 trouble.
Case 3 Cause PCU PWB EEPROM access circuit trouble
Check and
remedy
Replace the PCU PWB.
Details Lift-up trouble is detected 5 times continuously.
Section Scanner
Case 1 Cause STUD/STLD trouble.
STUD does not turn on within the specified time.
STLD does not turn off within the specified time.
Check and
remedy
Check the harness and the connector of the STUD
and STLD.
Lift-up trouble unit check