Recently I did a service call for a third-party company to replace an HVPS (high voltage power supply) in an HP M3035 printer for one of their customers. When I arrived onsite and printed a config page the background was so dark it was difficult to read the print on the paper. After talking to the customer, I found out that several technicians had been out there and had replaced various parts. Knowing the third-party company I went ahead and replaced the HVPS per my instructions.
After replacing the HVPS I turned the machine back on and printed a few pages. While the print looked better it was light. I checked the settings to make sure the density was set correctly and econo-mode was turned off. I turned the machine off and back on thinking that maybe a power off then on would fix the problem. To my unwanted surprise the dark background was back. I looked around the customer’s office and found another toner cartridge so I tried that with the same result. I also found some papers that had been previously printed with the same light print. This lead me to un
derstand that the previous technicians either failed to notice this problem or didn’t report the problem because the machine was back up and running.
Unfortunately, for the customer, they had an ongoing issue that wasn’t being solved. I had seen this problem before with the light print and had talked about it in a previous article relating to the P3005. It’s the same problem and fix for these multifunction machines.
I ran the engine test page and sure enough the engine test printed off fine. I then printed a few more config and engine test pages to verify the problem.
Yes, this is yet another formatter issue. Hope that helps solve your problems if you run into this particular issue on the HP Laserjet M3027 or M3035 Multifunction Printer.
Q7819-61009 Formatter (main logic) board – for HP Laserjet M3035/M3027 Series only
Kevin Gumpp is a certified printer technician and freelance writer for Market Point. Market Point is a HP PartsOne Partner selling HP printer parts. 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 firstname.lastname@example.org.