HP Color 9850mfp Service Manual - Page 95
DRUM UNIT, 3.1 Composition
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hp Color 9850mfp 3. DRUM UNIT 3.1 Composition DRUM UNIT II UNIT EXPLANATION [26] [25] [24] [23] [22] [21] [20] [19] [18] M14 [1] PS60 PS61 [2] M15 PS62 [3] PS63 [4] M16 PS64 PS65 [5] [6] [7] [8] [27] [28] [29] [30] [9] [10] [11] [12] [13] [14] [15] [16] M17 PS66 PS67 U V W DRDB/Y 1 2 3 DRDB/M 1 2 3 DRDB/C 1 2 3 DRDB/K HV1 [17] PRCB Symbol [1] [2] [3] [4] [5] Name Drum potential sensor board Y (DRPSB Y) Drum potential sensor board M (DRPSB M) Drum potential sensor board C (DRPSB C) Drum potential sensor board K (DRPSB K) Developing unit Y [6] Developing unit M [7] Developing unit C [8] Developing unit K [9] Charging Y Function or method Controls the drum potential sensor Y (DRPS Y) Controls the drum potential sensor M (DRPS M) Controls the drum potential sensor C (DRPS C) Controls the drum potential sensor K (DRPS K) Deposits yellow toner to the transfer image on the drum Y See "4. Developing unit." Deposits magenta toner to the transfer image on the drum M See "4. Developing unit." Deposits cyan toner to the transfer image on the drum C See "4. Developing unit." Deposits black toner to the transfer image on the drum K See "4. Developing unit." Forms a charging potential on the surface of the drum Y DC corona discharge (Scotron) Wire discharge: gold-plated tungsten wire (φ 30µm) Constant-current method DC output range: -450 to -1100µA Grid bias: charging grid plate Constant voltage method DC output range: -200 to -850V 2-21