HP LASERJET RESOURCES

Misplaced Ground Issue in HP LaserJet 4200 Family

In a laser printer, the printed image is generated by a laser beam, but a good image also depends on the toner cartridge being electrically charged in a certain way. This charge comes from the high voltage power supply. If the charge is off in one direction, you can get light print or even a totally blank page; if it is off in the other direction, you can get a dark background or even a totally black page. This charge on the cartridge is referenced to a ground connection. If the ground connection is missing or bad, the charge “floats”, and this can have the same sort of effects on the image that we described above.

This problem can occur in any laser printer, but it is especially common in the 42xx/43xx series (4200, 4240, 4250, 4300, 4345 MFP, M4345 MFP, and 4350). On these models, the toner ground connection is just a thick, stiff wire on the left side of the cartridge cavity (Fig. A), and it can easily get dislodged from its proper position. In the normal position, there should be about a finger-width between the ground wire and the white plastic guide below it (Fig. B). When it gets dislodged, it will usually be lower than the normal position (Fig. C, D). Depending where it is, you may even have trouble inserting the toner cartridge. If this happens, do not force it! Check the position of the ground wire. It is easy to move it back to its proper position.

The smeared page in Fig. E is a possible result. Partial print and other print problems are also possible.

ground

Misplaced Ground Issue in HP LaserJet 4200 Family

In a laser printer, the printed image is generated by a laser beam, but a good image also depends on the toner cartridge being electrically charged in a certain way. This charge comes from the high voltage power supply. If the charge is off in one direction, you can get light print or even a totally blank page; if it is off in the other direction, you can get a dark background or even a totally black page. This charge on the cartridge is referenced to a ground connection. If the ground connection is missing or bad, the charge “floats”, and this can have the same sort of effects on the image that we described above.

This problem can occur in any laser printer, but it is especially common in the 42xx/43xx series (4200, 4240, 4250, 4300, 4345 MFP, M4345 MFP, and 4350). On these models, the toner ground connection is just a thick, stiff wire on the left side of the cartridge cavity (Fig. A), and it can easily get dislodged from its proper position. In the normal position, there should be about a finger-width between the ground wire and the white plastic guide below it (Fig. B). When it gets dislodged, it will usually be lower than the normal position (Fig. C, D). Depending where it is, you may even have trouble inserting the toner cartridge. If this happens, do not force it! Check the position of the ground wire. It is easy to move it back to its proper position.

The smeared page in Fig. E is a possible result. Partial print and other print problems are also possible.

fan art

Misplaced Ground Issue in HP LaserJet 4200 Family

In a laser printer, the printed image is generated by a laser beam, but a good image also depends on the toner cartridge being electrically charged in a certain way. This charge comes from the high voltage power supply. If the charge is off in one direction, you can get light print or even a totally blank page; if it is off in the other direction, you can get a dark background or even a totally black page. This charge on the cartridge is referenced to a ground connection. If the ground connection is missing or bad, the charge “floats”, and this can have the same sort of effects on the image that we described above.

This problem can occur in any laser printer, but it is especially common in the 42xx/43xx series (4200, 4240, 4250, 4300, 4345 MFP, M4345 MFP, and 4350). On these models, the toner ground connection is just a thick, stiff wire on the left side of the cartridge cavity (Fig. A), and it can easily get dislodged from its proper position. In the normal position, there should be about a finger-width between the ground wire and the white plastic guide below it (Fig. B). When it gets dislodged, it will usually be lower than the normal position (Fig. C, D). Depending where it is, you may even have trouble inserting the toner cartridge. If this happens, do not force it! Check the position of the ground wire. It is easy to move it back to its proper position.

The smeared page in Fig. E is a possible result. Partial print and other print problems are also possible.

fans

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