3.2.3. C2455/C2456/C2457/C2458 Toner density abnormality (High
density) occur
(1) Symptom
C-CodeC2455(Y)/C2456(M)/C2457(C)/C2458(K)（Toner high density abnormality） occur.
(2) Cause
During long-run low coverage print, Toner charge is deteriorated due to lubricant attached
to toner. Developer level became deteriorated due to Toner charge deterioration and
Toner density sensor judges low after that Toner supplied.
It rotates above, Toner density becomes high.
After that, Toner high density occurs as Toner density sensor judges high, attached
lubricant toner is consumed, Toner charge and Developer level becomes normal.
(3) Solution
1．Replace Developer which occurred C-code.
2．Execute toner band creation function(YMCK 5%).
By using toner band creation function, the toner is regularly ejected from the developing unit,
and fresh toner is supplied.
When the less than YMCK 5% coverage is printed continuously, toner band is created on
the intermediate transfer belt to keep minimum coverage becomes YMCK 5%.
Side effect: Toner band creation setting reduces the productivity (Reduce by max 10% for
A4 conversion) and increases toner consumption at low coverage printing.
When the intermediate transfer CL blade count reaches more than half,
the cleaning failure may occur.
Note
To prevent 2nd transfer roller getting toner dirt from toner band, change the DIPSW for 2nd
transfer unit pressure release setting.
DIPSW103-7 : 1 (Default: 0)
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