[QUOTE=fuwei2422;1902861]Now I have another mp7502 want to move LD unit to the show sc220-00 of mp7502 what can i do?[/QUOTE
Just replace the polygon mirror motor. And possibly the polygon motor driver. Having swapped so many boards you might now also have 2 defective IPU boards as polygon motors have been known to take out the IPU.
Also could be a Lens out of position
hello, be careful, during the replacing of the laser diode board, or especially the door switches, you may have inadvertently pulled the harness, (actually very short and pulled) and unclipped the small internal connector that goes from the diode, to the switches, to check it, (from the outside you can't see it) you have to remove the left plastic panel, (from the paper exit) and with a light check the gap between the frame with a flashlight, if so, you can either disassemble the whole scanner unit top, or as or discovered later, with a bit of manual dexterity, with a spring release and tweezers, reconnect the connector.
I replace the LD、motor、IPU at a same time ,the sc220-00 is repair thanks very much
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