A few days ago I was called out to work on a HP M4555 MFP machine that didn’t have any power—no lights on the control panel or formatter board, no fans, no anything. The call was through a National Service Provider (NSP) so a customer service technician had diagnosed the machine over the phone and a low voltage power supply (LVPS) was sent to the customer’s office to be replaced.
When I arrived onsite I tried a few quick troubleshooting steps and decided to go ahead and take a look at the LVPS and noticed that one of the two fuses on it had blown. Since the NSP had sent out a replacement power supply, and I already had this one out, I decided to install the new LVPS.
Typically, when you have a blown fuse, simply replacing the fuse or the board fixes the problem. Unfortunately, once I replaced the LVPS, put the machine back together, and turned it on I heard a loud popping noise and the nice smell of electrical components burning. Continue reading
A few months ago I went out to a customer site to update firmware on five HP P4015 machines. They had been having unexpected print problems after upgrading their computer systems to Windows 8. Unfortunately this seemingly simple job went south quickly. Let me explain.
I downloaded the firmware on the first machine and it crashed half-way through the update. I rebooted the machine and was confronted with a SEND RFU UPDATE message. I was able to get the machine to a ready state and print some test pages but the network port was no longer working so I had to go to the USB update. Again, the firmware update crashed half-way through. Continue reading
A common problem that I run into with HP Color LaserJet 3500, 3550, 3700 printers is toner specks running down the paper vertically. This problem is different than periodic dots that show up on the page at defined intervals, otherwise known as repetitive defects. With a repetitive defect, note the color of the dot and measure the distance between the dots. The service manual describes what internal roller is causing the problem and you can simply replace the appropriate part.
Random toner specks can be a little more difficult to diagnose. Continue reading
I’ve been out on service calls and have seen, or heard, unusual things happening in the exit area of the HP 4200/4300 printers. What I’ve noticed is that sometimes the paper feeds through normally but with a little extra clicking or snapping noise. Other times the noise is accompanied by the paper not feeding through properly.
There are two exit flags that paper has to go through as it exits out of the machine to the face-down delivery area. One right-side flag is for the face-down bin-full sensor and the left side flag is just to provide equal pressure on the paper to the right side flag. On the bottom of the top cover HP has put two dampener pads like what you see on a solenoid. Over time these pads wear out. Continue reading
Two questions I’ve been asked recently are how to make the machine quieter and how to reduce the amount of paper curl on the sides of the paper.
Paper speeds have gotten pretty impressive on all printer makes and models. Even small printers have awesome print speeds. However, most people have noticed that their personal machines, the ones that sit next to them in their office, are too noisy, especially when they are printing while talking on the phone.
Another issue they’ve noticed is that paper is curling in the exit tray and, after 15 to 20 sheets are in the tray, the paper coming out starts Continue reading
I’ve seen more scanner assembly and print quality issues with the CM34350 model than any other HP all-in-one (AIO) machine. I’m not going to bore you with lots of details, but I will give you a few pointers to isolate problems and find solutions to these print quality issues, which can include black lines and background printing, among others. Here is an image copy example to help you understand what I’m talking about.
Isolating the Problem
If there are lines on your copies, print a document from the computer. If the printed page from the computer also has lines, you have a print quality problem related to the print engine. Drums, transfer belts, and the fusing assembly can be the possible culprits for print engine print quality issues.
If the printed page from the computer (or an internal test page) does not have lines we know the problem is Continue reading
The 13.A2.D2 error means that the paper is failing to get to the pre-feed sensor (PS102). Several things can cause this error. Here are a few troubleshooting tips to help isolate the problem and get it fixed with as little cost as possible.
Is the paper stop arrow lined up?
Remove the paper and paper tray. Verify the paper stop arrow is lined up with the mark on the bottom of the paper tray. If the paper stop is moved too far forward the paper will bind when the tray raises. Also, make sure the paper is properly loaded. Sometimes a few pieces of paper will bend up in the front of the tray causing the tray to not properly lift and feed paper.
Is the access door missing?
In the front of the tray there is an access door for the pick-up roller. Verify the access door is there. I’ve seen situations where these somehow get removed, causing intermittent paper jamming. Continue reading