asked Oct 11, 2003 at 6:15am
Hp HP DeskJet Plus

HP Laserjet 4 Plus error 51

Hello, since a few days i get a error 51 while printing. The printer stops before the paper comes out, goes to 02-warming up and a paper with three black banners comes out.
This happens when the printer is On for about one hour, before this the printer works fine.
I have tried the following:
- changed the fuser with one from another printer
- changed the power-cable
- changed the printer-cable
I hope someone knows what could be the problem with my printer.
Most likley it is the laser/scanner assembly. The motor is probably not spinning at the right speed. You would need to find an old hp 4 no longer working and switch the laser/scanner. It is the "black box" located under the top cover. You would need to remove the right side cover, the top cover, the left side cover and the output assembly. Remove all the cables from the scanner retaining clips. Remove the three cables plugged into the scanner and remove the four screws attaching the scanner to the frame. When replacing the scanner make sure the shutter control arm on the left front side of the scanner is sttached correctly so that the shutter closes when the toner cartiridge is removed. You could first try to remove the 3 connnectors and reseat them. On a very rare occasion this will correct the problem. 99\% of the time this error is the scanner assembly itself.
by dmzcompute on Oct 11, 2003 at 7:41am Add comment
Thanks for your reply David, i will try to find another laser, i will let you know if it works !!
by unknown on Oct 11, 2003 at 7:57am Add comment
The HP4 and 4+ use different scanner assemblies. You would have to find another 4+ scanner assy.
by dmzcompute on Oct 11, 2003 at 9:34am Add comment