In my opinion, you may have ultimate made the problem worse in the long run. By enlarging the holes you have allowed toner to drop faster. This can lead to an increase in toner hazing/scattering. Which in turn will cause the ID sensor to get dirty. When the sensor is dirty, process control will think that the patch is darker than is is which will cause light copies. At one time there was a bulletin out on the Aficio 1060 concerning stiction or toner spots building up on the drum. The bulletin introduced a new cleaning brush. Anytime I had trouble with the ID sensor getting fogged with toner I would put the newer brush on after cleaning the ID sensor.
From the 1060 Service Manual:
Another thing that will cause image to lighten is long print runs. Toner density will decline faster than the TD sensor on the Development Unit can keep up. You can force process control to update toner density by changing the frequency of ID patches being written. At the end of the job, if Vref has not been updated for 10 copies or more, the following occurs:
1. Vref is updated, as follows (also done just after the machine is switched on):
- The charge corona and laser diode write the ID sensor pattern on the drum.
- The ID sensor reads the reflectivity of the ID sensor pattern and outputs this reading as Vsp.
- The ID sensor also reads the reflectivity of the bare surface of the drum and outputs this reading as Vsg.
NOTE: 1) The 10 copy interval can be extended with SP2210-001 (ID Sensor Pattern Interval).
2) SP2507-002 (ID Sensor Interval – Page Setting) is available for customers who are concerned about changes in toner density during long copy jobs and may want to specify an interval to force creating and reading the ID sensor pattern. However, enabling this SP will pause copying for 2 or 3 seconds every time the ID sensor pattern is created and read.
3) SP2507-001 must be ON in order for SP2507-002 to have an effect.
2. The CPU uses the Vsp/Vsg readings to calculate a new value for Vref (TD sensor reference voltage).
3. Finally, Vt and Vref are compared. If Vt is higher than Vref, the CPU switches on the toner supply clutch to supply more toner to the development unit.
I usually set SP2507-002 to between 50 and 500. Too high and you will get toner fade between patterns. Too low and it will slow the machine down.
Bookmarks