Service manual

ENGINE SERVICE MODE
G130/G131 5-44 SM
[Forced Tnr Ref] Forced Toner Refresh
3921
Perform forced toner refresh mode.
When the developer has deteriorated or when prints are made in a very low humidity
condition, dirty background may appear continuously.
When this kind of dirty background appears, check whether or not the development
gamma is within the target (SP3-120 and 121). If the development gamma is not
within the target, do this SP mode.
The machine automatically does the toner refresh mode in the following sequence.
1. Consumes toner in the development unit without toner supply until toner end is
detected
2. Starts toner recovery mode.
3. Starts process control self-check.
NOTE: If toner is drastically consumed for a short time, this may cause carrier to
flow out. To prevent this, toner is consumed over a long period of time.(It takes
about 20 minutes to complete this toner refresh mode).
3921 001 Bk
3921 002 All Color
[OPC Refresh2]
*BCU
[0 ∼ 2 / 1
/ 1 /step]
0: Disable (OPC refresh is not executed.)
1: Low Coverage (OPC refresh is executed after
an output of low coverage ratio.)
2: All time (OPC refresh is executed after every
job.)
3922
Specifies when the OPC refresh is executed for CMY drums, which forcibly creates
a temporary 15mm-wide toner line on the drum surface by applying the development
bias (200V) and turning on the development clutch at the end of a job.
Note that this OPC refresh is a separate process from the one controlled by SP3-
920 and 3-921.
[Trans P Pat] Line Pattern between transferred papers.
3923
Generates line patterns between sheets on the transfer belt during a print job to
prevent the transfer-cleaning blade from rolling up.
3923 001 Temp *BCU [ 0 to 3 / 1 / 1 /step]
0: No Line
1: Input HH
2: Input HH, MM
3: Input All
HH (high temperature, high humidity)
MM (middle temperature, middle humidity)
3923 002 P width (Paper width) *BCU [ 1 or 2 / 1 / - ]
1: <= LTT (LT lengthwise or less)
2: All
Pat Interval *BCU [ 0 to 255 / 0 / 1 /step] 3923 003
If this SP is set to ‘n’, line patterns are generated once per “(n +1)” x 4 intervals.