Loading paper when we load paper into the tray it is still showing the message load paper! so nay memory is held and we are unable to print.switching the fax on and off seems to reset and then its ok,but we then lose all memory1

Device error An internal error occurred in the device. Press (Select) to resume the job. - Door open The printer door is open. The door must be closed before printing can continue. - Engine comm. error The device experienced an internal communication error. This is a warning message only. Job output might be affected. - Invalid driver You are using the incorrect printer driver. Reselect the printer driver appropriate for your device. - Invalid entry Invalid data or response. Correct the entry. - Jam in Cartridge area A paper jam has occurred in the print path. Open the door and clear the jam. Then press the (Select) button on the control panel - Jam in Output bin A paper jam has occurred in the output area. Clear the jam, and then press the (Select) button on the control panel. - Jam in print paper path. A paper jam has occurred in the print path. Open the door and clear the jam. Then press the (Select) button on the control panel. - Jam in tray 2 A paper jam has occurred in Tray 2. Clear the jam, and then press the (Select) button on the control panel. - Jam in tray 3 A paper jam has occurred in Tray 3. Clear the jam, and then press the (Select) button on the control panel - Load paper The HP Color LaserJet 1600 printer is out of paper. Please load specified paper type into the tray indicated. - Load Tray X [TYPE] [SIZE] The printer is processing job, but the tray indicated is empty. Please load specified paper type and size into the tray indicated. - Manual feed The printer is waiting for paper in the tray indicated Load the paper as indicated. - Memory is low The device memory has been almost completely filled. Allow the device to finish the job, or press (Select) to cancel the job. Break the job into smaller jobs that contain fewer pages. - Misprint The printed pages have been incorrectly placed on the paper. To continue, press the (Select) button on the control panel.

Select the paper source(paper tray) on the computer,select paper size.

The printer tells you to insert a letter format paper in the mp (multi purpose) feeder (the manual tray).
If you press the GO key the print probably proceeds with print job (if has the paper loaded in mp feeder)

make sure the paper is flush to the back. Pull the whole stack out and then push it pack in.

I can help you with your HP Laserjet 4 printer problem.

Ensure the paper is loading correctly from the paper tray by reloading paper and printing locally.

If the printer prints locally, then paper loading is not the problem. Select your printer from the Control Panel > Printers list, right click and choose Sharing to re-setup printer sharing.

I hope that helps.

490 error means -

LOAD mmm AND PRESS ONLINE SWITCH 490: MP TRAY EMPTY

Print job from MP Tray has been received and the MP Tray is empty.

Load the requested media (mmm) in the MP Tray and press ON-LINE.

Check your print driver settings and see if your defualt try is set for the MP Tray. Also see if the page setup for the print job is set for MP tray.

Turns out that the paper tray was damaged - the tray was unable to determine the correct paper size, despite fooling with the green paper stop. I had to compare it with a known-good tray to see the problem.

1.The printer is asking you to manualy load the right size paper.
source tray possibly tray 1
2. The printer has finished printing the first side of a manual-duplexed job and is waiting for the pages to be reloaded so it can print the second side. Reload the pages.
3.you are trying to print to the source (tray) and there is no paper in the selected tray. laod paper trays.
4. The print image is larger than size of paper in the tray. Load the right size paper. Press go Button

http://www.fixyourownprinter.com/reference/errorcodes/okidata