Why does a paper jam occur in HP inkjet printers when it is missing?
HP Inkjet Printers are known for the absurd Malfunction Diagnostic System messages. One of the typical messages during a fatal printer error is “paper jam, clear the jam and press OK”. An animation often follows, how to remove paper jammed in the printer. On the HP website, to fix the problem, it is suggested to find torn pieces of paper, turn off and on, and the like obvious things. Here we describe non-obvious reasons that can lead to a paper jam message.
Reasons for a jam
Specific cases of successful repair of HP inkjet printers with a “jam”.
1. The HP Photosmart C5183 MFP constantly writes “paper jam, clear the jam and press OK”, but there is no paper. The printer does not pick up paper at all. Diagnostics revealed that all gears are intact, no broken gears. The problem was a malfunction of the parking unit due to the ingress of foreign objects. After repairing the parking unit, the printer worked.
2. The HP Photosmart C6283, C5183, C7283 MFP reports a paper jam and suggests removing paper that is not there. There are no paper residues either, there are no foreign objects in the printer. On-screen demonstration of removing jammed paper. The printer does not pick up paper.
The cause of the jam is a bursting gear on the paper feed shaft at the back of the printer. The gear drives the carriage mechanism. To replace the gear, you need to disassemble half the MFP.
3. Such errors can be caused by a breakdown of the gear of the overhead gearbox, the pendulum mechanism, as well as the gear shift mechanism. Below is a cleaning unit and an overhead gearbox.
4. Cracking is accompanied by a “paper jam” error in the HP Deskjet Ink Advantage 5525 printer associated with a broken tooth in the carriage assembly.
A similar malfunction occurs in another printer, as well as in another place.
In many cases, when the engine rotates, some kind of obstacle is felt, which leads to jamming.
5. A jam in the HP Photosmart C5183 MFP Carriage may occur if the cleaning unit, in particular the mode lever, breaks. The work is complex, it requires disassembling almost the entire MFP and removing the cleaning unit. Price 2500-3000 rub. Possible with spare parts.
Occasionally, paper jams in HP inkjet printers result from a pump jam.
7. Damage to any gear on the drive shaft in older HP inkjet printers.
Foreign objects enter the carriage
If you recently opened the printer cover and, for example, changed cartridges, small foreign objects could get inside: a pen cap, a paper clip, or something similar. As a result, there will be an obstacle to the carriage, the printer will detect it and stop printing with an error.
You should open the printer and make sure that there are no foreign objects inside.
Pieces of paper or printer parts get in when removing a jammed sheet.
If the paper did jam during printing, but you didn’t remove it carefully enough, the sheet may tear, and some small pieces may get inside. If you acted very sloppy, you could break off pieces of some plastic elements. Both paper and parts may interfere, and the printer will write about “paper jams.”
Open the lid and carefully inspect the inside for torn pieces of paper. Finding and eliminating them can be difficult, especially if they are already saturated with ink and merge with the details. Small design elements are also not easy to find. Perhaps the printer still have to carry in service.
The carriage is stuck due to an improperly tightened CISS loop
If you use a continuous ink supply system for Canon, Epson or HP, it is possible that the cable inside was overstretched or tangled, thereby hampering the movement of the carriage. If the printer detects interference with printing, it may write a “paper jam” error.
Open the printer and check the ribbon cable. Roll the carriage inside (with the device turned off) and make sure that it moves without difficulty.
Encoder (raster) tape is not read correctly
An encoder tape is a hatched strip along which the device determines the position of the printing carriage in space. Carriage mileage is determined by the number of lines read on the encoder. So if dirt or ink gets on the tape, the positioning gets confused, and the carriage may bump into the wall of the printer. The printer will perceive this as an obstacle to printing and will give a “paper jam”.
Solves the problem of cleaning the encoder tape from contaminants. Wipe it with a dry cloth. If it doesn’t help, use slightly moistened water, but then the tape should still be wiped dry. You cannot use the service fluid to clean the encoder - you can damage the hatching, which is why the tape will generally be ejected.
Feed roller does not pick up paper
The paper feed roller will get dirty and lose its former elasticity over time, which can cause the printer to stop picking up sheets from the tray. The printer driver may perceive this as a jam, giving an appropriate error, although this happens infrequently.
If after sending the print job the sheet does not want to go into the printer, try cleaning the drawer roller with a cleaning agent. Keep in mind that alcohol-containing cleaners are not suitable for working with rubber - it dries out and becomes unusable even faster.
Damaged paper sensor
In fact, an error with a false “jam” most often occurs when the operation of the control system of the broaching mechanism (responsible for the movement of the sheet inside the printer) is not consistent with the sensor of paper in the path. That is, the printer pulls the paper, but "does not see its progress". From which the device makes a conclusion about a jam, writes about an error and slows down printing.
If at the same time there is no real jam (and you managed to discard other possible reasons) - it could be a jam or a paper sensor. The problem is especially relevant when spilling ink - the sensor could clog them.
If you have already cleaned and purged everything inside, but the error was not resolved, bring your HP, Canon or Epson to the service, so that the problem can be solved by specialists.