Sharp FO-2970M Service Manual - Page 6
FO-2970MU
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FO-2970MU 2 DC bias output voltage adjustment Adjust VR2 so that the output voltage is -310V ±5V For measurement, use the high voltage tester (effective value meter). - DC-Bias Output voltage check + DRUM DC-Bias VR1 (MC output voltage adjustment volume) - DC-Bias Output voltage check + VR2 (DV bias output adjustment volume) 3 Transfer charger voltage check After MC output voltage adjustment and DC bias output voltage adjustment, check transfer charger voltage. Check that the output voltage is +3200V ~ +3700V. For measurement, use a high voltage tester (effective value meter). + Transfer charger Output voltage check - D7 D8 DRUM + Transfer changer Output voltage check - Note: For measurement, do not remove Printer PWB from the bottom plate. Fig.3 VR1 (MC output voltage adjustment volume) 2 - 2 Fig.4