MX3500N SELF DIAG AND TROUBLE CODE 8 – 19
F2-77 Toner cartridge CRUM error
(YELLOW)
F2-78 Registration exclusive image density
sensor trouble (Transfer belt surface
reflection ratio abnormality)
F2-80 Half tone process control 1st patch
reference value trouble (BLACK)
F2-81 Half tone process control 1st patch
reference value trouble (CYAN)
F2-82 Half tone process control 1st patch
reference value trouble (MAGENTA)
F2-83 Half tone process control 1st patch
reference value trouble (YELLOW)
Trouble content CRUM cannot be read or written.
Section PCU
Case 1 Cause Connection trouble or disconnection of the connector
and the harness between the PCU and the toner
cartridge.
Check
and
remedy
Check the connector and the harness between the
PCU and the toner cartridge.
Case 2 Cause CRUM trouble
Check
and
remedy
Replace the toner cartridge.
Case 3 Cause Control PWB (PCU) trouble
Check
and
remedy
Replace the PCU PWB.
Trouble content The transfer belt surface is scanned by the image
density sensor before starting the registration, and
adjust the sensor gain so that the output is kept at a
certain level. However, the output is not within the
specified range though the senor gain is adjusted.
Section PCU
Case 1 Cause Image density sensor trouble, harness connection
trouble between PCU PWB and the image density
sensor, image density sensor dirt, transfer belt
cleaning trouble, calibration plate solenoid operation
trouble
Check
and
remedy
Check the sensor and the harness. Check the
calibration plate solenoid operation and the transfer
belt surface state.
If the trouble is not cleared, replace the image sensor
exclusively used for registration, replace the transfer
belt, replace the calibration plate, replace the
solenoid, or replace the PCU PWB according to the
check result.
Trouble content The low-density rising point or the high-density
saturation point cannot be calculated because of a
calculation error in the primary approximation formula
of the sensor output ratio for the LSU PWM value
obtained from the first step patch print result when
executing the half tone process control in BLACK.
Section PCU
Case 1 Cause Image density sensor trouble, harness connection
trouble between PCU sub PWB and the image density
sensor, image density sensor dirt, transfer belt
cleaning trouble
Check
and
remedy
Use SIM44-2 to execute the process control gain
adjustment. If "ERROR" is displayed, check the
sensor and the harness. If the adjustment is
completed, check the drum surface state and the belt
surface state.
Trouble content The low-density rising point or the high-density
saturation point cannot be calculated because of a
calculation error in the primary approximation formula
of the sensor output ratio for the LSU PWM value
obtained from the first step patch print result when
executing the half tone process control in CYAN.
Section PCU
Case 1 Cause Image density sensor trouble, harness connection
trouble between PCU sub PWB and the image density
sensor, image density sensor dirt, transfer belt
cleaning trouble
Check
and
remedy
Use SIM44-2 to execute the process control gain
adjustment. If "ERROR" is displayed, check the
sensor and the harness. If the adjustment is
completed, check the drum surface state and the belt
surface state.
Trouble content The low-density rising point or the high-density
saturation point cannot be calculated because of a
calculation error in the primary approximation formula
of the sensor output ratio for the LSU PWM value
obtained from the first step patch print result when
executing the half tone process control in MAGENTA.
Section PCU
Case 1 Cause Image density sensor trouble, harness connection
trouble between PCU sub PWB and the image density
sensor, image density sensor dirt, transfer belt
cleaning trouble
Check
and
remedy
Use SIM44-2 to execute the process control gain
adjustment. If "ERROR" is displayed, check the
sensor and the harness. If the adjustment is
completed, check the drum surface state and the belt
surface state.
Trouble content The low-density rising point or the high-density
saturation point cannot be calculated because of a
calculation error in the primary approximation formula
of the sensor output ratio for the LSU PWM value
obtained from the first step patch print result when
executing the half tone process control in YELLOW.
Section PCU
Case 1 Cause Image density sensor trouble, harness connection
trouble between PCU sub PWB and the image density
sensor, image density sensor dirt, transfer belt
cleaning trouble
Check
and
remedy
Use SIM44-2 to execute the process control gain
adjustment. If "ERROR" is displayed, check the
sensor and the harness. If the adjustment is
completed, check the drum surface state and the belt
surface state.
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