17. Malfunction code
Field Service Ver. 1.0 Jun. 2008
292
T
roubleshooting
C2553 Abnormally low toner density
detected magenta TCR sensor
• TC ratio in the developing machine, which is deter-
mined by toner replenishing amount control mecha-
nism, is 4 % or less for a given number of times
consecutively.
B
C2554 Abnormally high toner density
detected magenta TCR sensor
• TC ratio in the developing machine, which is deter-
mined by toner replenishing amount control mecha-
nism, is 11 % or more for a given number of times
consecutively.
• When the connector of the TCR sensor is discon-
nected.
B
C2555 Abnormally low toner density
detected yellow TCR sensor
• TC ratio in the developing machine, which is deter-
mined by toner replenishing amount control mecha-
nism, is 4 % or less for a given number of times
consecutively.
B
C2556 Abnormally high toner density
detected yellow TCR sensor
• TC ratio in the developing machine, which is deter-
mined by toner replenishing amount control mecha-
nism, is 11 % or more for a given number of times
consecutively.
• When the connector of the TCR sensor is discon-
nected.
B
C2557 Abnormally low toner density
detected black TCR sensor
• TC ratio in the developing machine, which is deter-
mined by toner replenishing amount control mecha-
nism, is 4 % or less for a given number of times
consecutively.
B
C2558 Abnormally high toner density
detected black TCR sensor
• TC ratio in the developing machine, which is deter-
mined by toner replenishing amount control mecha-
nism, is 11 % or more for a given number of times
consecutively.
• When the connector of the TCR sensor is discon-
nected.
B
C2559 Cyan TCR sensor adjustment
failure
• TCR sensor automatic adjustment does not function
properly, failing to adjust to an appropriate value.
B
C255A Magenta TCR sensor
adjustment failure
B
C255B Yellow TCR sensor adjustment
failure
B
C255C Black TCR sensor adjustment
failure
B
C2650 Main backup media access
error
• The re-written data, which has been read out,
checked and founded as error, is read out again and
found as error.
• The error was found when reading out the counter
value.
• The machine detects that the service EEPROM
board is not loaded in position.
C
C2651 EEPROM access error (IU C)
• An error was found when reading or writing data.
• The error was found when reading out the counter
value.
C
C2652 EEPROM access error (IU M)
C
C2653 EEPROM access error (IU Y)
C
C2654 EEPROM access error (IU K)
C
Code
Item
Detection timing
Rank
d-Color MF201
Service Manual Y109660-1
