Supplementary Information On Process Control - Ricoh B156 Service Manual

Event
K toner cartridge This is done after clearing the K toner near-end state
or K development (i.e., when a new K development unit is added). The
unit replacement machine idles and when the development roller stops for
10 seconds, indicating that idling is over, process control
occurs.
Color After the color toner end or near-end state is reset, the
development unit machine idles to transfer color toner to the development
replacement unit. After idling, process control occurs.
Color toner After the color toner end or near-end state is reset, the
cartridge machine idles to transfer color toner to the development
replacement unit. After idling, process control occurs.
24 hours after Same as "power on" process control
previous process
control
PCU replacement After the PCU counter is reset, it is lubricated (new OPC
belt lubricant application mode). Then process control
occurs.
After charge The wire is cleaned at these times, if a set number of
corona wire developments were done since the last cleaning:
cleaning
• In the middle of a job
• At the end of a job
• Immediately before the machine goes to low power
For more information:
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
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
SM
CÓPIA NÃO CONTROLADA
Condition
mode
6.7.2
2
, Range:0.40 to 0.90 mg/cm
6-17
CÓPIA NÃO CONTROLADA
PROCESS CONTROL
Steps
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→
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B156/B200