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Brother HL-645 , check HVPS?

Discussion in 'Electronic Repair' started by Supertech, Apr 3, 2007.

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  1. Supertech

    Supertech Guest

    Have this unit in for repair with dark print no matter where the contrast
    potentiometer is positioned. Custoemr changed the drum-toner unit in Dec
    with old stock from Brother. Now has same problem. Its possible the toner
    has been on the shelf too long as it comes with the drum unit, and bad toner
    can decrease drum life. TO be sure, I want to check the HVPS output to the
    drum. Theres a little springy thingy serving as the contact point, and maybe
    I can access it from the pcb via the bottom cover, but what is an
    acceptable voltage on this point? We did already clean the corona wire which
    did not help. The customer said he recently did the self cleaning on the
    corona wire with the built in slider cleaner as part of the unit - it
    helped, but now it no longer makes a difference.
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