hp Color 9850mfp TRANSFER BELT UNIT 5.2.2 Image correction unit A. Composition [5] [6] [8] [7] II UNIT EXPLANATION [1] [2] [3] [4] DRIVE DRIVE PRCB B. Shutter mechanism The image correction unit is provided with a shutter mechanism that allows the sensor to be exposed only when necessary to prevent the contamination of various types of sensors. and PS9) are opened and closed by the color registration shutter solenoid (SD2). And also, the image den- The color registration sensor shutters F and R that protect the color registration sensors F and R (PS8 sity sensor shutter that protects the gamma sensor (PS11) is opened and closed by the image density sen- sor shutter solenoid (SD3).
2-33 Symbol Name Function or method [1] Gamma sensor shutter solenoid (SD 3) Open/close of the image density sensor shutter 24VDC drive [2] Color registration shutter solenoid (SD2) Open/close of the color registration sensor shutters F and R 24VDC drive [3] Gamma sensor shutter Prevention of contamination of the Dmax sensor (PS10) and the Gamma sensor (PS11) Open/close method by means of the image density sensor shutter solenoid (SD3) [4] Gamma sensor (PS11) Detection of the maximum density and the gamma characteris- tics of the patch image on the transfer belt [5] Color registration sensor F (PS8) Detection of the transfer image position on the front side in the direction of the main scan [6] Color registration sensor shutter F Prevention of contamination of the color registration sensor F (PS9) [7] Color registration sensor shutter R Prevention of contamination of the color registration sensor R (PS9) [8] Color registration sensor R (PS9 ) Detection of the transfer image position on the rear side in the direction of the main scan