Removing the density sensor and topofpage sensor

1 Remove the upper multipurpose cover (see Removing the upper multipurpose cover). 2 Press the tab (shown in Figure 5-46 Remove the density sensor cover) on the sensor cover to release the cover, and then lift the cover up and away from the device. Figure 5-46 Remove the density sensor cover Figure 5-46 Remove the density sensor cover 3 Unplug one connector (callout 2). 4 Remove the two screws (callout 3). 5 Lift the density sensor straight up to remove it from the device. 6 Unplug one...

Line current control

The DC current from the CO needs to have a path to flow from TIP to RING. Because the current does not flow in the transformer, a path through some transistors and diodes (the DC hold circuit) acts like a simulated inductor (thus replacing the function of the transformer). This DC hold circuit is the main component of the voltage-current characteristic between TIP and RING. Two other functions of this block of circuits are the current limit and the SHUNT for Europe. Current limit basically...

Heating element test

Paper passes between the heating element and a soft pressure roller to fuse toner to the paper. 1 Unplug the device for at least ten minutes, and then remove the fuser. See Replacing the fuser assembly. 296 Chapter 6 Troubleshooting ENWW 2 Measure the fuser heating element resistance. NOTE Normal resistance is 14 ohms + - 10 ohms for the 110 V device and 50 ohms 3 Measure the thermistor resistance. Figure 6-3 Measure the thermistor resistance If no resistance is measured, replace the fuser. 298...

Engine test

The purpose of the engine test is to determine which image-formation process is malfunctioning. The image-formation process can be divided into the following stages Conditioning stage (charges the drum) Writing stage (writes a latent image to the drum with the laser) Development stage (forms a toner image on the drum) Transfer stage (transfers the image to paper) Separation stage (separates the media from the drum) Fusing stage (applies heat and pressure to make the image on paper permanent)...

Alert and warning messages

Alert and warning messages appear temporarily and might require the user to acknowledge the message by pressing Enter to resume or by pressing Cancel to cancel the job. With certain warnings, the job might not complete or the print quality might be affected. If the alert or warning message is related to printing and the auto-continue feature is on, the device will attempt to resume the printing job after the warning has appeared for 10 seconds without acknowledgement. Table 6-2 Alert and...

Enww

Envelope Envelope Envelopes with double Envelopes with adhesive strips or Hewlett-Packard limited warranty Print Cartridge and Imaging Drum Limited Warranty Print-cartridge Refilled print HP LaserJet printing HP Printing Supplies Returns and Recycling Program Regulatory FCC Requirements (United Telephone Consumer Protection Act (United EU statement for telecom New Zealand telecom IC CS-03 Declarations of Declaration of Declaration of Country- region-specific safety Laser safety Canadian DOC...

Aligning the carousel gears

Make sure that the gears in the print-cartridge carousel are aligned correctly before placing the carousel back into the device. 1 Rotate the carousel so that the marker for the yellow print cartridge faces the front of the device. 2 Examine the gears two marks on the smaller gear should line up with the single mark on the larger gear (see the detail of the gears in Figure 5-83 Reinstall the print-cartridge carousel). NOTE The single mark on the larger gear is adjacent to the slot for the black...

Print quality problems

Occasionally, you might encounter problems with print quality. The information in the following sections helps you identify and resolve these issues. jjpj NOTE If you are having copy problems, see Copy problems. Improving print quality Use the print-quality settings to prevent print-quality problems. Understanding print-quality settings Print-quality settings affect how light or dark the print is on the page and the style in which the graphics are printed. You can also use the print-quality...

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Envelopes with adhesive strips or flaps Envelopes with a peel-off adhesive strip or with more than one flap that folds over to seal must use adhesives that are compatible with the heat and pressure in the device. The extra flaps and strips might cause wrinkling, creasing, or even jams and might damage the fuser. Select the type of label that you are using from the Print dialog box or the printer driver. 28 Chapter 1 Product information ENWW CAUTION To avoid damaging the device, use only labels...