4050s feed then back out paper from tray 2

[onlyme]

I have a recurring problem that I'm hoping one of the experts can help with. I have 3 HP 4050s that will not feed from tray 2. The paper feeds in, then backs out, then feeds up again and sticks. 13.1 error. I've tried 3 different trays, two from working printers to hopefully eliminate the separation roller as the cause. I've also replaced the 4 paper feed horseshoe rollers, and after no luck I replaced the entire paper feed assembly. (That was a bugger! :( )
I read somewhere about removing half of the metal filings from the separation roller clutch, so I tried that on an extra tray, and I'm still getting the same result. I think I may have to turn this over to a "real" laser repair person. Unfortunately, I'm entirely too cheap for that except as a last resort, so I'm hoping someone here can guide me in the right direction. I'd appreciate any ideas as all of mine have been exhausted.

[Brian]

If the paper moves back into the printer it must be the clutch of the separation roller, I would replace them.

[onlyme]

On 3 trays??? ... Keeping in mind that two of those trays work perfectly on other printers? I'll give it a shot, though. It can't hurt and a clutch shouldn't be terribly expensive. I think I can disengage the separation roller clutch and make it work, but then there's nothing stopping multiple papers feeding through.
Thanks for your reply.

[ptjeff1]

You might need to replace the paper feed assembly. I know you said you replaced the feed assembly but maybe you replace the pickup assembly? The feed assembly (RG5-2651) is behind the mp tray assembly. This is a classic symptom of worn rollers in the feed assembly. Paper gets picked up but then falls back in the tray.

[onlyme]

You are quite correct. I replaced the paper pick up assembly. I'll give the feed assembly a shot. Thanks for your assistance. (And catching my syntax error)