Read Sharp MX-6500N / MX-7500N (serv.man27) Service Manual online
MX-7500N OPERATIONAL DESCRIPTIONS 13 – 41
b. High density process control operation (Toner patch generation and density correction operations)
1)
When the machine enters the high density process control mode, the secondary transfer unit remains in the printing position.
2)
While changing the DV bias voltage step by step, a number of toner patches in different densities are generated on the primary transfer
belt.
belt.
Front: The C toner patch is generated.
Center: The Bk, M toner patch is generated.
Rear: The Y toner patch is generated.
3)
Each toner patch density is detected by the image density sensor, and the DV bias correction voltage is calculated in the PCU PWB so that
the proper density is obtained from the relation between the DV bias voltage at the time when each toner patch is made and the toner
patch density.
the proper density is obtained from the relation between the DV bias voltage at the time when each toner patch is made and the toner
patch density.
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