HP LaserJet 6P
Tray 1 ( the upper or manual feed tray) will only pick up paper if it has 1/4 inch or more of paper loaded. It will not pick up the paper if there is only one sheet or even 5 or 10 sheets in that tray. The shiny metal bar that lifts up the paper does not seem to go up high enough if there are only a few sheets of paper in that tray. Can this be fixed?

Experienced technical support provide their insights in answering this question :
There is no way of adjusting the distance of lift. Could be that the pickup roller is worn enough that it will pick up a sheet that is higher, but not one that is lower down. You can look at the end of the roller that first makes contact and see if it is worn smooth.

How to Identify and Fix Common printer Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced technical support :

Generally when the printer tells you to print to tray 1 it means the job being sent to the printer is asking for a paper size and/or type that the printer does not think it has in any tray. Check you paper size and type settings for trays 2 and 3 and then check what each job is asking.
When the printer tells you to load tray 1 it means the size and or type of paper being asked by the print job does not match the same that the printer thinks it has in the tray.
Dust, paper fiber, and other debris might accumulate on the pick rollers and cause paper feed issues. To help prevent paper feed issues, clean the rollers inside the printer and in the duplexer (if equipped). If the other steps in this document fail to resolve the issue, then reset the printer.
Based on the paper settings in the printer driver and the paper information registered on the printer, the printer automatically determines the paper source and feeds paper. Paper is always fed from the rear tray.
Dust, paper fiber, and other debris might accumulate on the paper feed rollers and cause paper jams and paper feed issues.
Select > Paper Setting > paper source > Print Adjustments > Paper Feed Adjust.
There are a few things that could be the cause of this problem, including: Empty ink or toner cartridges that need replacing. Ink or toner cartridges that have become dislodged from their proper place. The wrong paper size loaded in the input tray.
Using both hands, put one piece of paper in the manual feed slot until the front edge of the paper touches the paper feed roller. Once the machine has grasped the paper, let go. The side to be printed should be faced up. The machine will hold the paper in place until the print data is sent to the machine.
Under Hardware and Sound, click Printer. Right-click your product, and then select Printing Preferences. From the Printing Preferences menu, select Paper/Quality. From the Paper Source drop-down menu, select Tray 2.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Tray 1 (upper tray) paper feed problem
ANSWER : There is no way of adjusting the distance of lift. Could be that the pickup roller is worn enough that it will pick up a sheet that is higher, but not one that is lower down. You can look at the end of the roller that first makes contact and see if it is worn smooth.

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HP LaserJet 6P

My printer feeds through one piece of paper all the way and then a half piece of paper and stops. I pull out the paper to stop the paper jam and then it prints but sounds rough. After printing, it doesn't feed the paper all the way through.
ANSWER : And the first 2 sheets, the full and half sheet that go through first, are blank.

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HP LaserJet 6P

Paper jam in tray 2 (but no paper pulled from tray) also M476DN models
ANSWER : Isopropyl alcohol is not recommended for rubber rollers. It dries out the rubber and hasten it’s cracking and breaking. It will do nothing to restore the grip. Those rollers are really hard to replace. It would be easy if that dumbass secondary menu really worked. None of the techs I’ve spoke to ever got into it. Everyone I know sends a print job and listens for the roller to rotate into position where you can pull it off.

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HP LaserJet 6P

Canon Pixma Printer Paper Does Not Feed Properly/"No Paper" Error Occurs?
ANSWER : Pretty much useless advice. I also have serious doubts about someone who is obviously not fluent in the English language.

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HP LaserJet 6P

HP DeskJet 722C Paper Feed Problem
ANSWER : Detach the force string from the holding nothing back one and expel all paper from it.

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HP LaserJet 6P

Brother Hl-2040 paper over feed
ANSWER : Your instructions saved me..I had the board off 3 times before i saw your pix….thanks so much!

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HP LaserJet 6P

Paper Feed Problem on HP R80
ANSWER : In the last examination it is our origination of death which chooses our responses to all the inquiries life puts to us. The most pleasant spot to be is in somebody’s idea; the most secure spot to be is in somebody’s petitions.

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HP LaserJet 6P

Paper Jam Tray 1
ANSWER : Tray No. 1 (the feeder) has to be either FULLY closed or FULLY down, down to about a 45 degree angle. Then hit the OK button and it should Initialize and start working. This solution is for when there is actually NO paper jamming the printer.

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HP LaserJet 6P