Panasonic KX MC6020 Service Manual - Page 107
HVU High Voltage Power Supply Board
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UPC - 037988840441
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6.17. HVU (High Voltage Power Supply Board) Section KX-MC6020HX 6.17.1. High Voltage Circuit This board outputs 12 high voltages used for electronic photographic process. The 12 voltages consists of 2 charge ( VCH/YMC, VCH/K : -1001V ~ -1405V ) for color (YMC) OPC and black OPC, 4 development bias ( VB/Y, VB/M, VB/C, VB/K : DC -100V ~ 300V + AC400Vp-p ) for each color, 4 supply bias ( VSR/Y, VSR/M, VSR/C, VSR/K : -200V ~ -400V), FTR bias ( FTR : 0V ~ 1800V ), STR bias ( STR : 0 ~ 5000V ). The Charge, Development bias, FTR Bias and STR Bias voltages are varied by the D/A converter setting data from the main board. If the signal HVEN is a low, 2 Charge, 4 Development Bias, 4 Supply Bias, FTR Bias and STR Bias voltages are generated. Each of the high voltages are specifically set depending on the print media, selected resolution, printing mode, duplicate mode, and humidity/temperature range of the room. The humidity and temperature are detected by a humidity sensor. OUTPUT CONTROL METHOD NOMINAL OUTPUT VOLTAGE NOMINAL LOAD LOAD AREA OUTPUT VOLTAGE RANGE OUTPUT CONTROL VCH/K VCH/YMC VB (K.C.Y.M) VB(+) C.V. C.V. C.V. (AC+DC) ZD -1203V±24V -1203V±24V AC:400V[P-P]±50V[P-P] 200V±25V (When 800Hz) DC:-200V±10V 40MΩ 13.3MΩ 200pF//100MΩ 10GΩ 24MΩ ~ 10GΩ 8MΩ ~ 10GΩ --- --- -1001V±20V~ -1405V±28V -1001V±20V~ -1405V±28V DC:-100V±10V~ -300±10V --- DAC DAC AC: Fix Fix DC:DAC OUTPUT VSR (K.C.Y.M) CONTROL METHOD VB(-)+ZD NOMINAL OUTPUT VOLT- -300V±20V AGE NOMINAL LOAD 100MΩ LOAD AREA --- OUTPUT VOLTAGE -200V±20V~ RANGE 400V±20V OUTPUT CONTROL DAC VSR(+) --200V±25V FTR C.V. 597V±30V 10GΩ --- --- Fix 10GΩ --0V±20V~ 1800±50V DAC STR(+) STR(-) CC/0V ZD CC 10µA±0.6µA -500V±50V 0V mode (VCHK= min when 0V±100V setting) (VCHK= min when setting) CC 150MΩ 500MΩ 500V ~ 5000V --- CC 1.5µ A ~100µA --- DAC Fix 6.17.2. Charge Control Circuit This circuit consists of a DC-DC converter, which boosts +24V to approximately -1001V ~ -1405V for the charge bias (maximum current rating 50µA for each color). This circuit has 2 boost circuits (VCH/YMC : Color, VCH/K : Black). The VCH/YMC and VCH/K voltages are controlled individually by the D/A converter circuit on the high voltage board. 107
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