Hp laserjet 5L - not printing

Hey there,:wave

Was looking at trouble shooting a repair I have recently made.

Laserjet 5L. I am hoping that you'll be kind enough to point me in the right direction.

The job i did was to replace the grey large central rubber sleeve which is situated over the central paper feed roller, i took the rubber sleeve part from a failed laserjet 6L. Everything seemingly went according to plan.:-D

However i experienced several issues, although now i can get the unit to recieve data, but the central icon one of three, shows a piece of paper folder over in one corner, led just flashes and the unit doesnt feed the paper through. I cant get a test page either:cry

There are no jams that I can visibly see - mind you the back half of the units housing is still off.

The unit was fine except for the original grey rubber sleave on the paper feed roller got badly damaged thanks to a drawing pin and needed replacement because it started jamming.

Can you please advise, I have checked the HP forums and found little help there. on fixing this issue. I have tried the drum from the laserjet 6L and gotten nothing either. There are no spare parts or ill fitting screws or cables disconnected. The unit has power and the data connection to the p.c / printer seems sound as the printer recieves the data. So my take is the issue is at the printer side...

Thanks in advance for any advice or input