41388601TH Rev.2 15 /Output voltage Use for+3.3 V Logic circuit power supply+3.8V Logic circuit power supply+5 V Motor and drive voltage for high-voltage power supply+32 V OP Amp, High-voltage power supply+12 V LED headOutput Voltage Use for RemarksCH -900 to -1400±50V Voltage to charging rollerDB Y, M, C: -10 to -400V/+300V Voltage to developing rollerK: -10 to -400V/+300VSB Y, M, C: -100 to -700/0V Voltage to toner supplying rollerTR 0 to 7KV Voltage to transfer roller Variable(2) High-Voltage Power UnitThis circuit generates the following 34V or more voltages, which are required for electropho-tographic process, according to control sequences from the control board.2.3 Power UnitsThere is a low-voltage power unit, which consists of an AC filter circuit, low-voltage power circuitand heater driver circuit, and a high-voltage power unit which supplies a high-voltage power circuit.(1) Low-Voltage Power UnitThis circuit generates the following voltages:(3) Flash ROM8 megabits of flash ROM (MBM29F800TA-70) which stores PU programs.(4) EEPROM4 kilobits of EEPROM (NM93C66N-NW) which is mounted on the board with an IC socket andstores correction values.(5) Pulse Motor DriverThe pulse motor driver (A2918, A2919, A3955) drives nine pulse motors to revolve the EPand carry media.(6) SRAMThis SRAM (62256LFP-7LL) is used as working memory of the CPU.
