Konica Minolta bizhub C650 Service Manual page 666

Field Service Ver. 8.0 Jun. 2008
Code Item
C2552 Abnormally high toner
density detected cyan
TCR sensor
C2553 Abnormally low toner
density detected magenta
TCR sensor
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
Detection timing
• TC ratio in the developing unit which is
determined by Toner replenishing amount
control mechanism, is a predetermined
value or more for a given number of times
consecutively.
• When sampling data is determined in TC
ratio calculation control, TCR sensor output
is higher than a predetermined value for a
predetermined number of times in a row
even though there is toner in the sub hop-
per.
• TC ratio in the developing unit, which is
determined by toner replenishing amount
control mechanism, is a predetermined
value or more for a given number of times
consecutively.
• When sampling data is determined in TC
ratio calculation control, TCR sensor output
is higher than a predetermined value for a
predetermined number of times in a row
even though there is toner in the sub hop-
per.
• TC ratio in the developing unit, which is
determined by toner replenishing amount
control mechanism, is a predetermined
value or more for a given number of times
consecutively.
• When sampling data is determined in TC
ratio calculation control, TCR sensor output
is higher than a predetermined value for a
predetermined number of times in a row
even though there is toner in the sub hop-
per.
• TC ratio in the developing unit, which is
determined by toner replenishing amount
control mechanism, is a predetermined
value or more for a given number of times
consecutively.
• TCR sensor automatic adjustment does not
function properly, failing to adjust to an
appropriate value.
• Contact the responsible people of KMBT
before taking some countermeasures.
16. Malfunction code
Trouble iso-
lation com- Rank
pliant unit
⎯
B
⎯
B
⎯
B
⎯
B
⎯
B
⎯
B
⎯
B
⎯
B
⎯
B
⎯
B
⎯
B
⎯ ⎯
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