Ricoh TH-C1b, Руководство по обслуживанию

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10 February 2005 PROCESS CONTROL
6-17
D
etailed
D
escr
iptions
Event Condition Steps
K toner cartridge
or K development
unit replacement This is done after clearing the K toner near-end state
(i.e., when a new K development unit is added). The
machine idles and when the development roller stops for
10 seconds, indicating that idling is over, process control
occurs.
➀
,
➂
,
➃
,
!
Color
development unit
replacement After the color toner end or near-end state is reset, the
machine idles to transfer color toner to the development
unit. After idling, process control occurs. ➀
→
➅
Color toner
cartridge
replacement After the color toner end or near-end state is reset, the
machine idles to transfer color toner to the development
unit. After idling, process control occurs. ➀
,
➃
,
➄
,
➅
24 hours after
previous process
control Same as “power on” process control ➀
,
➃
,
➄
,
➅
PCU replacement After the PCU counter is reset, it is lubricated (new OPC
belt lubricant application mode). Then process control
occurs.
➀
→
➅
After charge
corona wire
cleaning The wire is cleaned at these times, if a set number of
developments were done since the last cleaning:
•
In the middle of a job
•
At the end of a job
•
Immediately before the machine goes to low power
mode
For more information:
☛
6.7.2
ACC Process control is done just before ACC is done (this
process control can be enabled/disabled with SP 3-125).
Supplementary Information on Process Control
The following is a brief explanation of process control. This is for your reference. If
the information is helpful for understanding the machine in the field, read the
following explanation.
Step 1. ID Sensor Calibration
This calibration compensates for changes in the condition of the OPC belt or the ID
sensor. The ID sensor detects the light reflected from the bare OPC belt. The LED
current is adjusted until the sensor output is correct. The LED current for the color
toner detection circuit is adjusted based on the adjustment made for the black toner
detection circuit.
Step 2. Initializing Color Development Bias
For each color, the machine makes a solid patch (20x25) of toner on the OPC belt.
The ID sensor detects the density of the patch. The laser power for the patch of
toner is constant at about 210/255. Each color is calibrated separately (this step
has three stages - one for each color). M/A must be the following for areas of
maximum image density: 0.65 mg/cm
2
, Range:0.40 to 0.90 mg/cm
2
. If the detected
M/A is different from the target M/A, the development bias is adjusted.
Colour development bias initialisation is not always done. This is to reduce the
amount of time taken for process control. Also, in step 4, the current colour