Originally Posted by
FrohnB
Be sure to check these!
Laser comes out from left side of machine (remove left cover, a couple fans and small metal plates, and a few connectors). We have seen the shutter not open far enough (software bug) - update firmware if you haven't. Have seen techs just remove this shutter before without any effects down the road. I know there's an SP mode that you can adjust for the timing on the shutter too, but can't remember off the top of my head.
As slim said, could be that the lift for the ITB isn't working properly.
Make sure the springs on the back frame of machine that contact the ITB aren't bent/ missing - I say this because you changed toner pump, and have to get your hands/ tools all the way back there, may have bent something or knocked something loose unknowingly.
I'm voting lift issue though, since the black is unaffected. ITB contact motor P/n: B2231199 (rear cover, swing controller box out of the way, and it's right there, kind of a black/grey plastic encased motor) or if there's a lift sensor behind the ITB unit on rear frame of machine, make sure it didn't get knocked off.
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