Every once in a while I will get called about, or notice while I am onsite at a customer location, an issue with an HP LaserJet printer where the image on the page has shifted to the right, or to the left, or up, or down. Simply put, it’s not printing where it should be!
It’s pretty easy to spot this when you print the configuration page. The rectangular border around the edges will not be centered on the page. In theory, if you fold the paper in the corners on the box, the lines should line up with each other.
I’ve heard a few noisy M5025‘s and M5035‘s. Given the fact that everyone of these machines that I’ve worked on had the similar noise, I didn’t think too much of it. A few weeks ago I was called out to work on a 5200 series printer that gets very heavy usage. In the past two years the customer had put just over 400,000 prints on it. The printer was now jamming in the rear of the machine and making a grinding noise.
When I arrived onsite I noticed that the exit rollers on top of the machine were moving, but were periodically skipping. I then knew I had a gear problem somewhere in the machine. I had just installed a new fusing assembly in this same machine four months ago. Therefore, my first thought was that something went wrong with that fusing assembly. Below are the steps I followed for troubleshooting this problem. Continue reading →
Cliff writes: My HP service career started in 1989 with the original LaserJet and [my] certifications include almost every LaserJet made since.
Below is something I have found helpful:
Equipment: LaserJet II to current machines
HP and other printer makers use solenoids to control paper flow. To reduce “clicking” they put foam pads on one or both sides of the moving armature of the solenoids. Over time the pad wears and the adhesive migrates through the pad making the armature of the solenoids stick. Even a momentary “stick” can cause extra pages to feed or the D-Roller to grab and stop a page.
HP would have us at least replace the solenoid, and in the case of many Optional Tray 3+ products, replace the entire assembly.
Official Solution: Replace the solenoid.
What I do:
1) remove the solenoid
2) Place clear plastic tape on each side of the sticking surfaces
3) reassemble and test the device
Some paper path flags also use foam pads to keep them quiet and have the same issue with the same solution.
Like most machines built in this time period, the formatters in these machines are known points of problems. In this article, I’ll talk about the various problems you’ll see when the formatter has issues and how to go about troubleshooting to verify you are ordering the right part.
Types of Formatter Issues
Blank display with one, two, or three of the attention, data, or ready lights lit up solid or blinking.
HP logo hung on display or constantly moving but never going to a ready state.
Stuck on memory cycle, display goes blank after memory cycle or there is a row of asterisks or blocks on the display.
Warm up or initializing stuck on the display.
These are the main formatter issues I’ve seen or read about on this model. I’m sure there are more possible results so if your issue isn’t listed above continue reading.
Note: These machines do take time to complete their power-on sequence. Some customers get impatient and think they have a problem when they don’t.
This last year I’ve been experiencing more calls due to noise coming from the left side of these machines and, in extreme cases, the noise is followed by jamming in the face-down delivery assembly. When you close the back door on these machines a swing plate gear drops down and meshes with the top gear on the fusing assembly. Over time this gear gets worn down and a noise develops.
What I’ve noticed is that the swing plate gear noise is gradual and because these machines typically are noisy anyway, customers tend not to notice a problem until the printer starts jamming or the noise gets extremely bad.
To check this out, turn the machine off, remove the fusing assembly and check the gear. If you’re looking at the inside of the machine from the left side the gear is located on the bottom left part of the delivery assembly. It’s spring loaded so you can pull it down and get a good look at it. If the teeth are worn down it’s pretty obvious. If it’s really bad and jamming all the time you can further test it by running a paper path test from the information menu and send it to the face up exit assembly. The paper will exit out the left side of the machine and drop on the floor if the tray is not there but this test will verify if the fusing assembly is causing the problem or not.
Another way to check is to see if the rollers on top of the machine are rotating. If the teeth on the swing plate gear are stripped out, the exit rollers on the top of the face down delivery system will not be functioning correctly. Sometimes they don’t turn at all and other times they will turn only intermittently. The gear is not sold separately so if you find this to be the case then you will have to replace the face down delivery system. It’s not a tough job and because of the age of these machines the parts seem to be getting cheaper by the day. Right now these are some of the cheapest HP machines to own and operate because of the cost of parts and toner.
Kevin Gumpp is a certified printer technician and freelance writer for Market Point. If you have a question regarding this topic or have any other printer repair related questions or topics for which you would like more information, please send an email to email@example.com.
A few months ago I serviced a HP LaserJet P3005 for a third party company. While servicing the machine for a paper jam issue I noticed that it was printing extremely light and every time I turned it off and back on, upon reboot it gave me an 11.XX internal clock error. The internal clock error was pretty simple. That’s the formatter board.
The light print, though, threw me for a loop. The machine had an OEM cartridge, toner density all the way up, and not in toner save mode. The customer said it was always like that so they had no issue with it. I told them that to fix the clock error they would have to replace the formatter and possible either the ECU or formatter to fix the light print.
I know The HP LaserJet 8100 and 8150 printers are older models and it may seem like they are past their prime, but I still have several out in the field and recently I’ve seen a resurgence in service calls for these models. In this post I’ll share some of the more common problems with these printers in an attempt to help you diagnose and repair them as needed.
50.1 Fuser Error in the HP 8100 and 8150 You’re probably thinking “how hard can the 50.1 fuser error be to fix?” In this model, like the old HP LaserJet II and III series, the error is usually related to the AC power supply, not the fuser. Actually, about 90% percent of the time it’s the AC power module. When servicing machines for this error I typically pull the fuser out and check the thermal fuse on top of the fuser and the lamps inside the unit for continuity to verify the problem isn’t in the fuser. I also check that when the machine turns on it doesn’t initialize and then say “warming up” on the display. If it just jumps to 50.1 error, that is another give away.
After verifying the problem is related to the AC power supply I check the fuser for common wear and tear in case the fuser also needs to be replaced. When checking the fuser: Continue Reading