Product views
Product front view
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Product back view
1
4
2
3
- Rear door and face-up output bin (access for clearing jams)
- Dust cover for Tray 2 (for printing on legal-size paper)
- Power connection
- I/O ports and security lock
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Interface ports
1
| 1 | Slot for a cable-type security lock |
| 2 | Local area network (LAN) Ethernet (RJ-45) network port |
| 3 | Hi-Speed USB 2.0 printing port |
| 4 | Telephone “line out” port for attaching an extension phone, answering machine, or other device |
| 5 | Fax “line in” port for attaching the fax phone line to the product |
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Serial number and model number location
The model number and serial number are listed on an identification label located on the back of the product. They are also listed on the inside of the front door. The serial number contains information about the country/region of origin, the product version, production code, and the production number of the product.
| Model name | Model number |
| M521dn | A8P79A |
| M521dw | A8P80A |
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Control panel
Control-panel layout
| 1 | Touchscreen display |
| 2 | Help button and light |
| 3 | Right arrow button and light |
| 4 | Cancel button and light |
| 5 | Wireless light (wireless models |
| only) | |
| 6 | Attention light |
| 7 | Ready light |
| 8 | Back button and light |
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9 | Left arrow button and light | Moves the cursor to the left |
NOTE: This button illuminates only when the current screen can use this feature.
10 Home button and light Provides access to the Home screen
NOTE: This button illuminates only when the current screen can use this feature.
Control-panel Home screen
The Home screen provides access to the product features, and it indicates the product status.
NOTE: Depending on the product configuration, the features on the Home screen can vary. The layout might also be reversed for some languages.
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Control panel help system
The product has a built-in Help system that explains how to use each screen. To open the Help system, touch the Help 
button in the upper-right corner of the screen.
For some screens, the Help opens to a global menu where you can search for specific topics. You can browse through the menu structure by touching the buttons in the menu.
Some Help screens include animations that guide you through procedures, such as clearing jams.
For screens that contain settings for individual jobs, the Help opens to a topic that explains the options for that screen.
If the product alerts you of an error or warning, touch the Help button to open a message that describes the problem. The message also contains instructions to help solve the problem.
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Print product reports
From the Reports menu, you can print several informative pages about the product.
- From the Home screen on the product control panel, touch the Setup
button.
button.- Touch the Reports button.
- Touch the name of the report that you want to print.
| Menu item | Description |
| Demo Page | Prints a page that demonstrates print quality |
| Menu Structure | Prints a map of the control panel-menu layout. The active settings for each menu are |
| listed. | |
| Configuration Report | Prints a list of all the product settings. Includes network information when the |
| product is connected to a network. | |
| Supplies Status | Prints the status for each toner cartridge, including the following information: |
| ● Estimated percentage of cartridge life remaining | |
| ● Approximate pages remaining | |
| ● Part numbers for HP toner cartridges | |
| ● Number of pages printed | |
| Network Summary | Prints a list of all product network settings |
| Usage Page | Prints a page that lists PCL pages, PCL 6 pages, PS pages, pages that were jammed |
| or mispicked in the product, number of pages printed; and reports the page count | |
| PCL Font List | Prints a list of all the PCL fonts that are installed |
| PS Font List | Prints a list of all the PostScript (PS) fonts that are installed |
| PCL6 Font List | Prints a list of all the PCL6 fonts that are installed |
| Service Page | Prints the service report |
| Print Quality Page | Prints a page that helps solve problems with print quality |
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2 Paper trays
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Supported paper sizes
NOTE: To obtain the best results, select the correct paper size and type in the print driver before printing.
Table 2-1 Supported paper sizes
Size and dimensions Tray 1 Tray 2 and the Automatic duplex
optional 500- printing
sheet trays
Letter
216 x 279 mm (8.5 x 11 in)
Legal
216 x 356 mm (8.5 x 14 in)
Executive
184 x 267 mm (7.25 x 10.5 in)
8.5 x 13 in
216 x 330 mm (8.5 x 13 in)
A4
210 x 297 mm (8.3 x 11.7 in)
A5
148 x 210 mm (5.8 x 8.3 in)
A6
104 x 148 mm (4.1 x 5.8 in)
B5 (JIS)
182 x 257 mm (7.2 x 10.1 in)
16K
184 x 260 mm (7.2 x 10.25 in)
16K
197 x 273 mm (7.75 x 10.75 in)
Postcard (JIS)
100 x 148 mm (3.9 x 5.8 in)
Double Postcard (JIS)
200 x 148 mm (7.9 x 5.8 in)
Custom
76 x 127 mm to 216 x 356 mm (3.0 x 5.0 in to
8.5 x 14 in)
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Table 2-1 Supported paper sizes (continued)
Size and dimensions Tray 1 Tray 2 and the Automatic duplex
optional 500- printing
sheet trays
Custom
105 x 148 mm to 216 x 356 mm (4.1 x 5.8 in to
8.5 x 14 in)
Custom
210 x 280 mm to 216 x 356 mm (8.3 x 11 in to
8.5 x 14 in)
Envelope #10
105 x 241 mm (4.1 x 9.5 in)
Envelope DL
110 x 220 mm (4.3 x 8.7 in)
Envelope C5
162 x 229 mm (6.4 x 9.8 in)
Envelope B5
176 x 250 mm (6.9 x 9.8 in)
Envelope Monarch
98 x 191 mm (3.9 x 7.5 in)
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Supported paper types
For a complete list of specific HP-brand paper that this product supports, go to www.hp.com/support/ ljmfpM521series.
NOTE: To obtain the best results, select the correct paper size and type in the print driver before printing.
| Table 2-2 | Supported paper types | ||
| Paper type | Tray 1 | Tray 2 and optional | Automatic duplex |
| 500-sheet trays | printing |
Plain
HP EcoSMART
Light 60–74g
Midweight 96–110g
Heavy 111–130g
Extra Heavy 131–175g
Transparency
Labels
Letterhead
Envelope
Preprinted
Prepunched
Colored
Bond
Recycled
Rough
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Tray 1
Tray capacity and paper orientation
To prevent jams, do not overfill trays. Be sure the top of the stack is below the tray-full indicator. For short/narrow and heavy/glossy paper, load paper to less than half of the tray full indicators.
Table 2-3 Tray 1 capacity
Table 2-4 Tray 1 paper orientation
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Load Tray 1
- Open Tray 1.
- Pull out the paper support and fold out the extension.
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- Load the paper into the tray. Make sure that the paper fits under the tabs and below the maximum-height indicators.
- Adjust the side guides so that they lightly touch the paper stack but do not bend the paper.
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Tray 2 and optional Tray 3
Tray capacity and paper orientation
To prevent jams, do not overfill trays. Be sure the top of the stack is below the tray-full indicator. For short/narrow and heavy/glossy paper, load paper to less than half of the tray-full indicators.
| Table 2-5 | Tray 2 and optional Tray 3 capacity | |
| Paper type | Specifications | Quantity |
| Paper | Range: | Equivalent to 500 sheets of 75 g/m2 (20 lb) |
| 60 g/m2 (16 lb) to 130 g/m2 (35 lb) |
Table 2-6 Tray 2 and optional Tray 3 paper orientation
| Single-sided printing | Automatic duplex printing and | Envelopes |
| Alternative Letterhead Mode | ||
| Face-down | Face-up | Print envelopes only from Tray 1. |
| Top edge at the front of the tray | Bottom edge at the front of the tray |
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