Brother International HL-1070 Service Manual - Page 70
Replace the H.V., H.V. power
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I-2 Dark Possible cause Density dial Corona failure (soiled wire) Corona failure (contact failure) Drum unit failure H.V. power supply PCB Main PCB Driver PCB Step Check Result Remedy 1 Is the density dial at the center click position? No Set it to the center click position or reasonable position. 2 Is the corona wire dirty? Yes Clean the corona wire by using the wire cleaner. 3 Are the corona electrodes between the printer body and drum unit dirty? No Clean both electrodes. 4 Is the problem solved when the Yes Replace the drum drum unit is replaced? unit with a new one. 5 Are there any disconnected connectors? No Replace the H.V. power supply. 6 Are there any disconnected connectors? No Replace the main PCB. 7 Are there any disconnected connectors? No Replace the driver PCB. HV.GND contacts (Fig.4-5) ➇ ➅ IV-6
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