HP LaserJet 2430 prints vertical grey bands

the two places to look is transfer roller and the fuser unnit.
i think there is a problem with the transfer roller it is under the toner and it needs to be spring loaded. The paper passes between the toner an the transfer roller to charge the paper en let the toner stick to the paper and if it doesn't make correct contact then it wont work

i have hp printer laser 1505, it can print out and i set the paper on portrait. but the output of printing out is the characters are on landscape style. So what should i do...plz help me if somebody can solve it

Most common and easiest to check is the toner cartridge. Swap it out and see if it goes away. If not then it is in the fuser unit. The fusing unit is the part that gets hot and is located right before where the paper exits the machine.
If the bands go all the way across the page then the toner cartridge is much more likely.

Hello,

Here is the print defect information from the service manual.

1. Toner Cartridge.
The circumference of the photoconductive drum is 3.75 inches (94mm). The circumference of the developer roller is 2 inches (51mm). If a defect appears in the print image at these intervals, assume the defect is associated with the Toner Cartridge. Replace the Toner Cartridge.
2. Fuser Assembly.
The Fuser Roller’s circumference is approximately 2.5 inches (63mm) for the LJ4, and 3-1/8 (79mm) for the LJ4+/5. If a defect
appears at this interval, assume the defect is associated with the Fuser Assembly. Clean the Fuser Assembly rollers. Replace the assembly if necessary.
3. Dirty Roller.
Any dirty roller along the paper path may result in a pattern of
repetitive print image defects. Examine and clean rollers along the
paper path.

We have the full service manual download available for $6.95 if you need it. We also carry all repair parts for your printer.

I hope this helps, if so please rate my solution.

Buddy
Corporate Computer
www.ccl-la.com
Over 21 years of PC and printer support/repair

Have you tried running some printer cleaning sheets through it? They are available through Office Depot, Fry's and other stores.

Also, it could be an issue with the imaging drum. I've worked on several printers which have had a similar issue and they needed the imaging drum replaced. Typically that helped.

Replace the Magenta Toner cartridge.

Is your transfer roller clean?
How does the drum look on the toner cart?
Is the fuser getting bad?

Would you consider this an old image that is ghosting?

the problem exclusive between the drum or the fusser unit

Try lowering the toner density using the printing software or the printer menu.

try a new toner cartridge

if it doesn't fix your problem then you willneed a new fuser
it is probably delaminated