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Help to identify a semiconductor


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I have a Brother HL-1030 printer.
The cartridge part # is TN6300, which is composed of toner unit and drum unit TN6000.

Last week the printer started to leave unused toner on the paper, so all surface of the paper is grey.

The photo drum is cleared from unused toner by a brush which is electrified in order to demagnetize it, so the drum stays always clean.

The current passes through a semiconductor! When I checked it with tester - no signs of life.
So I think, that it's because of this semiconductor.

So please, help me to identify the component and where can I buy it or maybe it's analogue.

Photos of this element are attached or you can find them here:

Thanx a lot


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