HP Color 9850mfp Service Manual - Page 87

II UNIT EXPLANATION hp Color 9850mfp WRITE Symbol [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] Name Index sensor board C (INDX SB C) Index sensor board K (INDX SB K) Index lens Laser correction motor Y (M7) Laser correction motor M (M8) Laser correction motor C (M9) Write unit K Write unit C Write unit M Write unit Y Dust-proof glass fθ lens [25] Cylindrical lens 2 [26] Index mirror [27] Laser drive board Y (LDB Y) [28] Laser drive board M (LDB M) [29] Laser drive board C (LDB C) [30] Laser drive board K (LDB K) [31] Collimator lens Function or method Controls the laser writing position in the main scan direction (write unit C) Controls the laser writing position in the main scan direction (write unit K) Collects the laser light reflected from the index mirror Swing-drives the cylindrical lens 2 (write unit Y) Swing-drives the cylindrical lens 2 (write unit M) Swing-drives the cylindrical lens 2 (write unit C) Write unit for black Write unit for cyan Write unit for magenta Write unit for yellow Keeps dust out from the write unit Makes the laser scan speed uniform against the laser exposure surface on the drum Corrects the laser path against the angle error in the polygon mirror Reflects the laser light to the index sensor boards Y, M, C, K (INDX SB Y, M, C, K) Laser light (write unit Y) 1 chip 1 beam method, 7mW 650nm Laser light (write unit M) 1 chip 1 beam method, 7mW 650nm Laser light (write unit C) 1 chip 1 beam method, 7mW 650nm Laser light (write unit K) 1 chip 1 beam method, 7mW 650nm Collimates the diffusing laser light *1 It is not installed on the write unit /K. 2-13