HP LaserJet M607 Driver, Vertical Bars, Fuser Problems, Tray Jams, and Door Error Cases

HP LaserJet M607 Driver, Vertical Bars, Fuser Problems, Tray Jams, and Door Error Cases

The HP LaserJet Enterprise M607 can keep printing in some cases while still showing clear signs that something is wrong inside the paper path, fuser path, tray assembly, toner system, or door-detection system. 

Users reported issues such as vertical bars on printed pages, poor print quality that followed a replacement fuser, stuck trays after changing paper size, false Close front door errors, and printers that would not power on after a maintenance kit or fuser replacement.

Problem: HP LaserJet M607 prints vertical bars on the page

What users observed: Users reported that the HP LaserJet M607 started printing a vertical bar or repeated dark mark on output. The printer still produced pages, but the defect appeared on the print and made the output unusable. In one case, the toner cartridge was replaced first, but the vertical bar continued.

What was tried: Users replaced the toner cartridge and swapped the fuser with one from another HP LaserJet M607 that was not showing the issue. After the fuser swap, the vertical bar disappeared briefly, but after a few prints, it came back again.

How this played out: The toner cartridge was not the only likely cause because replacing it did not clear the defect. The temporary improvement after the fuser swap made the fuser path suspicious, but the return of the bar suggested that another part of the print process could be contributing as well. Real-world troubleshooting pointed toward checking the transfer roller under the toner, confirming that paper type settings were correct, and making sure the printer was not using an envelope or low-pressure fuser mode that could leave residual toner on the fuser sleeve.

Problem: HP LaserJet M607 fuser causes edge-to-edge print defects

What users observed: Users managing multiple HP LaserJet M607 printers reported that replacement fusers sometimes printed well at first, then began producing terrible output shortly after the warranty period. The defect followed the replacement fuser when it was moved to another machine, while the same printer worked normally with a different fuser.

What was tried: Users updated firmware, reduced toner density, moved the fuser between printers, checked media, checked the drum path, and compared results across multiple M607 units in the same building. Running the printer’s cleaning page helped temporarily in some cases, but the print-quality defect returned after a few days or weeks.

How this played out: Because the defect followed the fuser to other printers, the issue was isolated to the fuser rather than the printer body. Users suspected that some “new” fusers were actually refurbished units where only rollers had been changed. Edge-to-edge print defects were treated as a strong fuser clue, especially when the cleaning page only provided temporary relief.

Problem: HP LaserJet M607 replacement fuser works briefly then fails again

What users observed: Some replacement fusers worked normally for a short period, then started causing print-quality problems again. The printer could look repaired immediately after the fuser swap, only for the same kind of defect to return after regular use.

What was tried: Users compared OEM and non-OEM fusers, checked packaging, tested the fuser in more than one printer, and verified that other printer components were not causing the problem. Some users managing large fleets reported avoiding fusers that did not arrive in original OEM packaging.

How this played out: The reported pattern pointed toward fuser quality rather than random printer failure. A replacement fuser that causes the same defect across multiple machines is not behaving like a working new unit. In these cases, the practical fix was to treat the fuser as suspect and replace it with a known-good OEM fuser rather than continuing to troubleshoot toner, paper, or driver settings.

Problem: HP LaserJet M607 tray gets stuck after changing paper size

What users observed: Users reported that an HP LaserJet Enterprise M607 tray became stuck after switching from A4 to Legal paper. The paper did not fit correctly, a paper jam occurred, and after the tray was forced into the printer, the tray could not be pulled back out. Even after removing the paper manually, the tray remained stuck because part of the tray mechanism appeared jammed.

What was tried: Users tried removing the paper, pulling the tray back out, and checking the visible tray mechanism. The problem started after the tray was forced into the printer with the wrong or poorly adjusted paper-size setup.

How this played out: This was not a driver or print-queue issue. The tray mechanism was physically jammed. Forcing the tray further risked breaking more internal parts. In the reported case, the practical advice was to stop forcing the tray and treat it as a service issue, especially because these models can have fragile tray mechanisms and paper-size parts.

Problem: HP LaserJet M607 tray size parts move out of position

What users observed: In fleet use, users reported that HP LaserJet M607 trays were fragile, especially the mechanical parts that tell the printer what paper size is installed. These parts could pop out of position and make the tray unusable until they were placed back correctly. The tray level indicator arm could also pop out of position.

What was tried: Users repositioned the tray parts, repaired tray indicators, and in some office environments modified the tray so users could not easily knock the paper-size mechanism out again. In maintenance kit work, users also noted that rollers and tray-related parts required careful handling.

How this played out: The tray problems were mechanical and user-handling related, not solved by reinstalling the printer driver. When paper size detection or tray level parts moved out of place, the printer could misread the tray, jam, or refuse to feed properly until the tray mechanism was restored.

Problem: HP LaserJet M607 shows Close Front Door even when the door is closed

What users observed: Users reported that HP LaserJet M607 printers displayed Close front door even though the front door was physically closed. The printer showed the front-door diagram and would not clear the message. In some cases, the door was flush with the printer body and appeared properly latched.

What was tried: Users checked whether the door was flush, reseated the fuser, reseated the toner cartridge, inspected both front and rear doors, located the front door sensor, tested continuity, swapped in a new fuser and toner, and even swapped a controller board or formatter in some cases. Those changes did not always clear the message.

How this played out: The error was not always caused by the obvious front door latch. In a later user-reported resolution, the front-door closed switch was tied to the laser shutter holder assembly. A small sensor had broken loose, so the arm could not press the microswitch correctly. Replacing or repairing the laser shutter holder assembly was the meaningful direction when fuser, toner, board, and ordinary door checks did not solve the false door message.

Problem: HP LaserJet M607 does not power on after maintenance 

What users observed: Users replaced the maintenance kit, rollers, transfer roller, and fuser on an HP M607, then plugged the printer back in and got no power at all. The printer showed no sign of life. Reinstalling the old fuser did not bring it back.

What was tried: Users checked the power cable, wall outlet, and fuser part. They confirmed that the replacement kit voltage matched the printer model, such as a 110V kit for a 110V printer. They also tried the old fuser again to see whether the new fuser had caused the failure.

How this played out: Other technicians noted that the printer would generally need to power on before a fuser could short something during operation. In the reported case, the user eventually treated it as a bad power board and scrapped the printer. The failure happened after maintenance work, but the final outcome did not prove that the fuser itself was the direct cause.

Problem: HP LaserJet M607 maintenance rollers unable to install correctly

What users observed: In fleet environments, users reported that the official fuser maintenance kit included replacement rollers and a special roller removal or installation tool. Even with the tool, the roller installation could be delicate, and the printer could make loud clicking sounds or fail to feed paper if the rollers were not seated correctly.

What was tried: Users followed the maintenance kit instructions, used the special tool, and checked whether the replacement rollers were installed in the correct position. The tool made the work easier but did not fully prevent incorrect installation.

How this played out: The roller installation was a mechanical maintenance issue. If the printer clicked loudly or could not feed paper after maintenance, the rollers were likely not seated correctly. Once the rollers were installed properly, the device started working properly.