Konica Minolta Magicolor 8650 Service Manual page 336

Field Service Ver. 2.0 Nov. 2007
Code Item
C2554 Abnormally high toner
density detected magenta
TCR sensor
C2555 Abnormally low toner
density detected yellow
TCR sensor
C2556 Abnormally high toner
density detected yellow
TCR sensor
C2557 Abnormally low toner
density detected black
TCR sensor
C2558 Abnormally high toner
density detected black
TCR sensor
C2559 Cyan TCR sensor
adjustment failure
C255A Magenta TCR sensor
adjustment failure
C255B Yellow TCR sensor
adjustment failure
C255C Black TCR sensor
adjustment failure
C2650 Main backup media
access error
Confidential – for internal use only, do not distribute
Detection timing
• TC ratio in the developing machine, which is
determined by toner replenishing amount
control mechanism, is 11 % or more for a
given number of times consecutively.
• When the connector of the TCR sensor is
disconnected.
• TC ratio in the developing machine, which is
determined by toner replenishing amount
control mechanism, is 4 % or less for a
given number of times consecutively.
• When the connector of the TCR sensor is
disconnected.
• TC ratio in the developing machine, which is
determined by toner replenishing amount
control mechanism, is 11 % or more for a
given number of times consecutively.
• When the connector of the TCR sensor is
disconnected.
• TC ratio in the developing machine, which is
determined by toner replenishing amount
control mechanism, is 4 % or less for a
given number of times consecutively.
• TC ratio in the developing machine, which is
determined by toner replenishing amount
control mechanism, is 11 % or more for a
given number of times consecutively.
• When the connector of the TCR sensor is
disconnected.
• TCR sensor automatic adjustment does not
function properly, failing to adjust to an
appropriate value.
• 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.
14. Malfunction code
Trouble iso-
lation com- Rank
pliant unit
⎯
B
⎯
B
⎯
B
⎯
B
⎯
B
⎯
B
⎯
B
⎯
B
⎯
B
⎯
C
295