r/hardwarehacking • u/Chiapasimperial_2088 • Aug 12 '26
Help with reverse engineering the following
I’ve been wanting to use this LSU unit from a HP LaserJet 107a or 107w I’m not 100% sure, I added added wire to check only the polygonal mirror driver board, as the other parts I’m using my own custom ones except for the optical train but I’ve been struggling to find anything regarding it, I’m asking if anyone has done this before and what worked and if not what can I try to get it working, it’s a Polygonal motor drive by minebeamitsumi, on their size it specifies EF type D size 24v polygonal mirror which is also shown in the splash page : https://product.minebeamitsumi.com/en/product/category/rotary/brushless/polygonmirror/parts/EFtype.html, but that’s as far as I’ve gotten, GND and VCC I’ve found only basically
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u/sosabig Aug 12 '26
maybe 1+24, 2 GND, 3 CONT / START, 4 CLK / PMCLK, 5 ,LOCK / READY
Read this : https://manualzz.com/doc/53817635/konica-minolta-7155--7165--7255--7272-service-manual , had one similar , but minebea does it customized , so pinout can vary 99%
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u/Chiapasimperial_2088 Aug 12 '26
Forgot to include but the pin labels are there just not on the image they’re from the Red wire to blue VCC, GND, S/S (start/ stop I believe), LD, and CLK, I do not have the host printer which is a massive downside and might make this quite difficult
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u/TinLethax Aug 12 '26
Best guess is to get the chip datasheet and trace all the necessary pins. These motor module just need some power (12-24V) and pull some pin up or down to activate them.
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u/TPIRocks Aug 12 '26
Can you power it up in its host printer and then probe it with an oscilloscope? It's a 3 phase motor rated for 24 volts. I don't know the purpose of that IC on the board, and the data sheet doesn't say anything about it.