Instruction/ maintenance manual of the product 821P Garmin
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Epson ® PowerLite ® 821p Multimedia Projector User’ s Guide.
2 Important Safety Information WARNING : Never look into th e projector lens when the la mp is turned on; the bright light can damage your eyes. Never let children look into the lens when it is on. Never open any cover on the projector, except the lamp and filter covers.
3 Contents Welcome . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Getting the Most from Your Projector . . . . . . . . . . . . . . . . . 8 Using Your Documentation . . . . . . . . . . . . . . . . . . . . . . . . . 9 Getting More Information .
4 Contents 2 Projecting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Turning On Your Equipment . . . . . . . . . . . . . . . . . . . . . . . 30 Turning On the Projector . . . . . . . . . . . . . . . . . . . . . . . 30 Selecting the Image Source.
Contents 5 Using the Projector’s Security Features . . . . . . . . . . . . . . . . 62 Creating Your Own Screen Logo . . . . . . . . . . . . . . . . . 63 Setting a Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 Turning On the Password and User’s Logo .
6 Contents Safety and Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95 Compatible Video Formats . . . . . . . . . . . . . . . . . . . . . . . . . 96 Compatible Computer Display Formats . . . . . . . . . . . . . . . . 97 B Notices .
7 - Welcome T he Epson ® Lite ® 821p is a portable projector that offers up to 2600 ANSI lumens of brightness. From classrooms to boardrooms, your full-color presentations and videos will be bright and visible even in ordinary indoor lighting.
8 Welcome To prevent unauthorized use of your PowerLite 821p , you can assign a password, create a user logo which is displayed at startup to identify the projector, and disable the projector’s buttons through the Operation Lock feature. For more i nformation about security features, see page 62.
Welcome 9 Using Your Documentation Your documentation includes a Quick Setup sheet, warranty brochures, and Epson PrivateLine ® Support card. The Quick Setup sheet gives instructions to quickly set up your projector and connect it to a notebook, iBook, or PowerBook computer.
10 Welcome Registration and Warranty Your projector comes with a basic carry-in warranty and an international warranty that let you project with confidence anywhere in the world. For details, see page 104 and the warranty brochure that came with your projector.
Welcome 11 Save all packaging in case you need to ship the projector. Always use the original packaging (or equivale nt) when you need to send the projector to another location. Additional Components Depending on how you plan to use the projector, you may need additional components: ■ To receive an S-video signal, you need an S-vid eo cable.
12 Welcome Optional Accessories To enhance your use of the projector, Epson p rovides the following optional accessories: You can purchase these accessories from your dealer, by calling Epson at (800) 8 73-7766, or by visiting the Epson Store SM at www.
13 1 Setting Up the Projector T his chapter tells you how to set up the projector and connect it to a computer or video source. You can connect up to four devices simultaneously: four video sources, one computer and three video sources, or two computers and two video sources.
14 Setting Up the Projector Positioning the Projector Before connecting the projector, you need to decide where to place it. If you’re setting up the projector yourself and it isn’t already installed in the room you’re using, you’ll probably want to place it on a table in front of the screen, as shown.
Setting Up the Projector 15 Try to place the projector di rectly in front of the center of the screen, facing the screen squarely. If the pr oj ector isn’t positioned this way, the image will be “keystone” shaped, instead of square or rectangular.
16 Setting Up the Projector Connecting to a Computer You can connect the PowerLite projector to any computer that has a standard VGA or BNC monitor port, including PC notebook computers, Macintosh PowerBook s and iBooks, and hand-held devices. You can connect two computers at the same time.
Setting Up the Projector 17 3. Connect one end of the cable to the proje ctor’s Computer1/Component Video1 or the Computer2/Component Video2 port. If you are going to connect your computer monitor to the projector for simultaneous display, use the Computer1/Component Vid eo1 port.
18 Setting Up the Projector If you don’t need to make any other connections, you can plug in your projector and turn it on. See page 30 for instr uctions.
Setting Up the Projector 19 If you don’t need to make any other connections, you can plug in your projector and turn it on. See page 30 for instructions.
20 Setting Up the Projector 3. Connect the flat end of the cable to any available USB port on your computer. 4. If necessary, configure your note book to work with an external mouse. If you don’t need to make any other connections, you can plug in your projector and turn it on.
Setting Up the Projector 21 Playing Sound Through the Projector Your computer probably has its own sound system; however, it may not be adequate for your presentation. If you need more volume, you can connect a computer audio cable to take advantage of the projector’s built-in speaker.
22 Setting Up the Projector Connecting to Video Sources You can connect a DVD player, VCR, camcorder, laser disc player, digital camera, gaming console—such as Microsoft Xbox, Sony PlayStation 2, or Nintendo GameCube—or any other compatible video source to your projector.
Setting Up the Projector 23 Connecting a Composite Video Source If you’re connecting a composite video device, use a commercially-available RCA A/V cable. Before starting, make sure the projector and your DVD player or other video source are turned off.
24 Setting Up the Projector Connecting an S-video Source If your video source has an S-vide o jack, you can use it to project a higher quality video image. You’ll need an S-video cable, which is usually provided with your video source, or you can purchase one from Epson.
Setting Up the Projector 25 Connecting an RGB Video Source Follow these instructions to conn ect the projector to a video player or satellite receiver that has an RGB video output port using the VGA computer cable that came with the projector. Before starting, make sure the pr ojector and your DVD player or other video source are turned off.
26 Setting Up the Projector Connecting a Component Video Source If your video source has component video connectors, you can use them to project a higher qualit y video image. You’ll need a component video cable (ELPKC19), which can be purchased fr om Epson.
Setting Up the Projector 27 Playing Sound Through the Projector The projector has a built-in speaker with a maximum output of 5 W. You can play sound from your video equipment through the projector’s speake r if your video device has an audio output port.
28 Setting Up the Projector For Stereo Mini-Jack Audio Output Ports Some video devices, especially camcorders, may have a stereo mini-jack audio output port. In this case, us e a commercially-available stereo mini jack audio cable to connect to the projector, as shown below: 1.
29 1 Projecting O nce you’ve set up the projector, you’re ready to turn it on, adjust the image, and give your presentation. Although you can operate the projec tor without it, the remote control lets you use additional features. See Chapter 3 for instructions on using the remote.
30 Projecting Turning On Your Equipment Make sure your projector and other equipment are set up and connected correctly, as described in Chapter 1. Then turn on your projector, as described below.
Projecting 31 3. Connect the other end to an elec trical outlet. The Power light on top of the projector turns orange, indicating that the projector is receiving power but not yet turned on. Wait until the light stops flashing but stays orange. 4. Turn on your computer or video source if you have not already.
32 Projecting When you’re done with your presentation, shut down t he projector as described on page 41. Shutting down the projector correctly prevents premature lamp failure and possib le damage from overheating. Selecting the Image Source If you have only one device connected to the projector, the projector should detect it automatically.
Projecting 33 What To Do If You See a Blank Screen If you see a blank screen or a blue screen with the message No Signal after turning on your computer or video source, try the following: ■ Make sure the cables are connected correctly, as described in Chapter 1.
34 Projecting If you’re using a Macintosh with OS X: You may need to set up your system to display on the projector screen as well as the LCD screen.
Projecting 35 If the Arrange option isn’t available, you may need to select one of the Simulscan resolution settings: 1. Click the Monitor icon, if necessary. 2. Select a Simulscan resolution, as shown. (Allow a few seconds for the projector to sync up after making the selection.
36 Projecting Focusing and Zooming Your Image Rotate the focus ring to sharpen the image. Rotate the zoom ring to re duce or enlarge the image. You can also change the image size by moving the projector closer to or farther away from the screen. You can use the E-Zoom buttons on the remote control to zoom in on a portion of the image.
Projecting 37 Adjusting the Height of Your Image If the image is too low, you can ra ise it by extending the projector’s front adjustable foot. 1. Stand behind the projector. Press up on the b lue foot release lever and lift the front of the projector to extend the front adjustable foot.
38 Projecting Adjusting the Image Shape The projector automatically corrects images that are distorted when the projector is tilted up or down (up to a 15° tilt).
Projecting 39 You can also make keystone adjust ments using the projector’s Setting menu. See page 58. Adjusting the Brightness The brightness of an image depen ds on the source you are projecting and the amount of light in the room.
40 Projecting The following table lists the six color modes available. To change the color mode, press the Color Mode button on the remote control until you see the mode you want. The currently selected setting appears in the upper right corner of the screen.
Projecting 41 Adjusting the Volume You can use the butt ons on the remote control or projector to increase or decrease the volume for the projec tor’s built-in speaker or external speakers connected to the projector. Press the button to increase the volume, or the button to decrease it.
42 Projecting 3. Press the P Power button again. The lamp turns off, and the Power light flashes orange for about 20 seconds as the projector cools down. When the projector has cooled, it beeps twice to indicate that power is off. The Power light stays orange and the exhaust fan shuts off.
43 13 Using the Remote Control T he remote control lets you access your projector’s features from anywhere in the room—up to 20 feet away. For example, you can turn the projector on and off, freeze the presentation, zoom in on a portion of your image, and access the menu system.
44 Using the Remote Control Controlling the Picture and Sound You can use the remote control to select your source, temporarily turn off the picture and sound, freeze the action, or zoom in on the picture. Make sure you have set up your projector and connected any equipment as described in Chapter 1.
Using the Remote Control 45 Turning Off the Picture and Sound Press the A/V Mute button on the remote control to turn off the image and sound and darken your screen. This is useful if you want to temporarily re-direct your audience’s attention without the distraction of a bright screen.
46 Using the Remote Control 4. While the image is enlarged, you can: ■ Use the pointer button to pan about. ■ Press the E-Zoom button to zoom out. 5.
Using the Remote Control 47 Using the Remote Control as a Wireless Mouse When you use the remote control as a wireless mouse, you can control your computer or click through slideshow-style presentations (such as PowerPoint) from up to 20 feet away .
48 Using the Remote Control Replacing the Batteries The remote control uses two AAA alkaline batteries. Follow these steps when you need to replace them: 1. Press in the tab to remove the battery cover. 2. Remove the old batteries, then insert the new ones as shown.
49 433 Fine-tuning the Projector Y ou can use the Menu button on the projector or remote control to access on-screen menus to adjust the image, sound, and other features.
50 Fine-tuning the Projector Using the Projector’s Menu System The six projector menus let you adjust and customize the projector features: ■ The Image menu lets you modify the colors of the projected image and fine-tune brightne ss, contrast, and sharpness.
Fine-tuning the Projector 51 Changing Menu Settings Use the buttons on the remote control to access the menus and change settings. Follow these s teps: 1.
52 Fine-tuning the Projector 4. After highlighting the opt ion you want to adjust, use the pointer button on the remote control or left or right arrow buttons on the projector to change the setting. In some cases, you may have to press the Enter button to see a sub-screen for changing the setting.
Fine-tuning the Projector 53 Adjusting Colors and Clarity The Image menu lets you make ad justments to th e colors of the projected image and fine-tune brig htness, contrast, and sharpness. The options available depend on which image source is selected: Follow these steps to ad just th e appearance of your image: 1.
54 Fine-tuning the Projector 3. Use the pointer but ton (or the up and down arrow buttons) and press Enter to select any of the following options: ■ Color Mode Corrects the vividness of image color.
Fine-tuning the Projector 55 Adjusting the Input Signal Although the projector normally detec ts and optimizes the input signal automatically, you can use the Signal menu to make manual adjustments.
56 Fine-tuning the Projector 3. Press Enter . Then use the pointer button (or up and down arrow buttons) and the Enter button to select any of the following options: ■ Auto Setup (computer images) Leave this setting ON to automatically optimize the computer image.
Fine-tuning the Projector 57 ■ Video Signal (composite and S-video) Leave this setting at Auto unless you are using a 60-Hz PAL system (select PAL60 ). ■ Resize (video) Sets the image’s aspect ratio (ratio of width to height) to 4:3 for letterbox video content and to 16:9 for widescreen video content.
58 Fine-tuning the Projector 3. Press Enter . Then use the pointer button (or up and down arrow buttons) and the Enter button to set the following options: ■ Keystone Adjusts a distorted im age fr om a trapezoid shape to rectangular. (The corrected image will be smaller.
Fine-tuning the Projector 59 Selecting Projector Setup Options Use the Extended menu to customize the way you set up the projector. You can configure the projector for rear and/or ceiling projection, .
60 Fine-tuning the Projector ■ Projection Front: Projector is in front of the screen. Front/Ceiling: Projector is in front of the screen, mounted upside-down from the ceiling. Rear: Projector is be hind the screen. Rear/Ceiling: Projector is behind the screen, mounte d upside-down from the ceiling.
Fine-tuning the Projector 61 Viewing Lamp Usage and Other Information Use the Info menu to view information about the display settings of your computer and the number of hours the lamp has been used.
62 Fine-tuning the Projector ■ Refresh Rate (computer, RGB video, and component video) Displays the refresh rate. ■ Sync Info (computer, RGB video, and component video) Provides information that may be needed by th e service technician. 2. When you’re finished, press Esc or Menu .
Fine-tuning the Projector 63 If you assign the projector a password, a screen appears requesting the password whenever the projector is turned on. If you enter the password incorrectly three times in .
64 Fine-tuning the Projector 3. Use the pointer but ton (or the down arrow button) and press Enter to select User’s Logo . 4. When you see a message asking if you want to use the present image as a user’s logo, select Yes and press Enter . A selection box displays over the image.
Fine-tuning the Projector 65 Setting a Password 1. Press the Freeze button on the remote control for about 5 seconds until you see the Password Protect menu: 2. Select Password and press Enter . You see the message Change the pas sword? 3. Select Yes and press Enter .
66 Fine-tuning the Projector 4. If you want to disable the password temporarily, select Timer and press Enter . Then hold down the Num button while you use the numeric keypad to enter the number of hours (from 0 to 9999) that you want the password feature disabled.
Fine-tuning the Projector 67 Press down the Num button on the remote control as you use the numeric keypad buttons to enter the password. Once you have entered the password correctly, th e password screen closes, and projection begins. If the password is not correct, you see the message Wrong password.
68 Fine-tuning the Projector Restoring the Default Settings The Reset menu lets you return most projector menu settings to their default values. It also lets you reset the lamp hours to their inital default value; see page 75 for instruct ions on resetting the lamp timer.
69 5 Maintaining and Transporting the Projector Y our projector needs little maintenance. All you need to do on a regular basis is keep the lens clean. Any dirt or smears on the lens may show up on your projected image. You also need to periodically clean the air filter and the air intake and exhaust vents.
70 Maintaining and Transp orting the Projector Cleaning the Lens Clean the lens whene ver you notice dirt or dust on the surface. ■ Use a canister of compressed air to remove dust. ■ To remove dirt or smea rs on the lens, use lens-c leaning paper.
Maintaining and Transp orting the Projector 71 Cleaning and Replacing the Air Filter Clean the air filter and air intake and exhaust vents on the bottom and rear of the projector after every 10 0 hours of use. If they are not cleaned periodically, they c an become clogged with dust, prevent ing proper ventilation.
72 Maintaining and Transp orting the Projector 4. If you need to replace the filter, slide it off, as shown. 5. Align the new filter carefully as you slide it into place. It should click into place. Replacing the Lamp The projection lamp typically lasts for about 2000 hours of use (in high brightness mode) or 3000 hours (in low brightness mode).
Maintaining and Transp orting the Projector 73 Contact your dealer or call Epson at (800) 873-77 66 in the United States for a replacement lamp. Re quest part number V13H010L30. In Canada, please call (800) 46 3-7766 to locate a dealer. Follow these steps to replace the lamp: 1.
74 Maintaining and Transp orting the Projector 6. Hold the la mp as shown and pull it straight out. 7. Gently insert the ne w lamp. If it doesn’t fit easily, make sure it’s facing the correct way. 8. Once the lamp is fully inserted, tighten its screws.
Maintaining and Transp orting the Projector 75 Resetting the Lamp Timer You must reset the lam p timer afte r replacing the lamp to clear the Replace th e Lamp warning message. Follow these steps: 1. Connect the power cable and turn on the projector. 2.
76 Maintaining and Transp orting the Projector Transporting the Projector The projector contains many glass and precision parts. If you need to transport it, please follow these packing guidelines to preve nt damage to the projector: ■ When shipping the projector for repairs, use the origin al packaging material if possible.
77 6 Solving Problems T his chapter helps you solve problems with your projector, and tells you how to contact technical support for problems you can’t solve yourself.
78 Solving Problems Follow these steps to get he lp: 1. Press the ? Help button on the remote control or projector. You see the help menu. 2. Use the pointer button on the remote control or the up and down arrow buttons on the projec tor to select an option.
Solving Problems 79 What To Do When the Lights Flash The lights on top of the projector indicate the projector’s status and let you know when a problem occurs. If the projector is not working correct ly, first turn it off and unplug it. Then plug the power cord back in and turn on the projector.
80 Solving Problems Power light Lamp light Temperature light Description Red Flashing red Flashing red There is an internal error in the projecto r. Turn the projector off and unplug it. Contact Epson for help. Red Off Flashing red There is a problem with the fan or a sensor.
Solving Problems 81 Solving Problems with the Image or Sound Power does not turn on. ■ Make sure the power cable is connected. Also, connect a lamp to your power outlet to make sure it’s working. ■ If the projector lights turn off and on when you touch the power cable, the cable may be defective.
82 Solving Problems ■ The attached computer may be in sleep mode or displaying a black screen saver. Try pre ssing a key on the computer. ■ If you’re projecting from a video source, press the Play button on your video equipment. Nothing appears on the external mo nitor.
Solving Problems 83 If you’re using a PC notebook: ■ Hold down the Fn key and press the function key that lets you display on an external monitor. It may have an icon such as , or it may be labelled CRT/LCD . Allow a few seconds for the projector to sync up after pr essing it.
84 Solving Problems The message Not Supporte d is displayed. ■ Make sure your computer’s resolution and frequency are supported by the projector. Se e page 97.
Solving Problems 85 ■ Macintosh OS 9.x : On the Apple menu, choose Control Panels , then click Monitors or Monitors and Sound . Select a different resolution. If this option isn’t available, se lect one of the other compatible video formats listed on page 96.
86 Solving Problems ■ If you’re projecting from a composite or S-video source, check the Video Signal setting in the Signal menu . In most cases, leave it set at Auto . If you’re using a 60-Hz PAL video source, change this setting to PAL60 . See page 57 for details.
Solving Problems 87 You see vertical stripes, flickerin g, or the image still looks blurry after trying the solutions in the previous section. ■ If you’re projecting from a comput er and displayin.
88 Solving Problems ■ Try adjusting the Color Adjustment setting on th e Image menu. See page 54. ■ Check your computer display settings to correct the color balance. ■ If the image seems dark, the lamp may be nearing time for replacement. Check the lamp hours as described on page 61 and replace it, if necessary, as described on page 72.
Solving Problems 89 Solving Password Problems You have forgotten the password. ■ Write down the request code that appears in the Password Protect Release screen and contact Epson.
90 Solving Problems You have lost the remote control. You need the remote control to access many pr ojector features. If you have lost it, you can order another from Epson. See page 91 for details about ordering. You can’t control the mouse pointer with the remote control.
Solving Problems 91 Where To Get Help Epson provides technical assistan ce through el ectronic support services 24 hours a day, as listed in the following table. Telephone Support Services To use the Epson PrivateLine Support ser vice, call (800) 637- 7661 and enter the PIN on the Epson PrivateLine Support card included with your projector.
92 Solving Problems Before you call, please have the following information ready: ■ Product name (PowerLite 821p) ■ Product serial number (located on the bottom of the projector) ■ Computer or v.
93 Technical Specifications General Type of display Poly-silicon TFT active matrix Lens F=1.70 to 1.87, f=2 1.3 to 25.6 mm Resolution 1024 × 768 pixels Color reproduction Full color, 16.8 million colors Brightness (ANSI) 2600 lume ns (High brightness mode) 1900 lumens (Low brig htness mode) Contrast ratio 500:1 Image size 30 to 300 inches (0.
94 Technical Specifications Projection Lamp Power consumption 200 W Lamp life Abou t 2000 hours (High br ightness); 3000 hours (Low brightness) Remote Control Range 20 feet (6 meters) Operating angle About ± 30° horizontally About ± 15° vertically Batteries (2) Alkaline AAA Mouse Compatibility Supports USB (Type B) Dimensions Height 4.
Technical Specifications 95 Environmental Temperature Operating: 41 to 95 °F (5 to 35 °C) Storage: 14 to 140 °F (–10 to 60 °C) Humidity Operating: 20 to 80% RH, non-condensing Storage: 10 to 90%.
96 Technical Specifications Compatible Video Formats You can use any of the following video sources: VCR, DVD p layer, camcorder, digital camera, gaming co nsole, or laser disc player. The projector supports composite video, S-video, component video, and RGB video, and it automatically senses the video format (HDTV, SDTV, NTSC, PAL, or SECAM).
Technical Specifications 97 Compatible Computer Display Formats You can connect the projector to a wide range of computers, including PCs and notebooks, Apple Macint osh, Power Macintosh series (including G3, G4 and G5 systems), PowerBook computers, many iMac and iBook series systems, and high-end workstatio ns su ch as th e Sun ® SPARCstation.
98 Technical Specifications The projector supports these monitor display formats: Mode Refresh Rate (Hz) Resolution VGA EGA 70 640 × 350 VGA—60 VESA—60 VESA—72 VESA—75 VESA—85 60 60 72 75 8.
99 Notices T his appendix includes safety instru ctions and other important info rmation about your Epson PowerLite projector. Important Safety Instructions Follow these safety instructions when setting up and using the projector: ■ Do not place the projector on an unstable cart, stand, or table.
100 Notices ■ Never push objects of any kind through the cabinet slots. Never spill liquid of any kind into the projector. ■ Except as specifically explained in this User’s Guide , do not attempt to service this product yourself. Refer all servicing to qualified personnel.
Notices 101 Remote Control Information You can operate the projector by remote control via a line-of-sight infrared (IR) receiver at the front and rear of the projector.
102 Notices Declaration of Conformity According to 47CFR, Part 2 and 15, Class B Personal Computers and Peripherals; an d/or CPU Boards and Power Suppli es used with Class B Personal Computers We: Epson America, Inc.
Notices 103 FCC Compliance Statement For United States Users This equipment has been tested and fo und to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protecti on against harmful interference in a residential installation.
104 Notices Warranty Epson America, Inc. Limited Warranty Basic Two-Year Warranty and 90-Day Lamp Warranty What Is Covered: Epson America, Inc. (“Epson” ) warrants to the original retail purchaser.
Notices 105 THE WARRANTY AND REMEDY PROVIDED ABOV E ARE EXCLUSIVE AND IN LIEU OF ALL OTHER EXPRESS OR IMPLIED WARRANTIES INCLUDIN G, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABI LITY OR FITNESS FOR A PARTICULAR PURPOSE. SOME LAWS DO NOT ALLOW THE EXCLUSION OF IMPLIED WARRANTIES.
106 Notices.
107 Index A A/V cable, 22 to 23 A/V Mute, 45, 59, 63 to 64, 81, 88 Accessories, 12, 92 Adapters, Macintosh, 12, 17 Air filter cleaning and replacing, 71 to 72 purchasing, 12 Anti-theft device, 12 Aspe.
108 Index Distance from projector to screen, 14, 93 Documentation, using, 9 DVD player, connecting to, 22 to 26 Dynamic color mode, 40 E Electrical specifications, 94 Enter button, 47, 51 to 52 Enteri.
Index 109 Logo creating, 63 to 64 displaying, 64 to 66 turning on, 59, 65 to 66 Low brightness, 39, 72 , 93 M Macintosh adapters, 12, 17 connecting, 16 to 19 Manuals, 9 Menus changing settings, 51 to .
110 Index Projector accessories, 12 carrying case, 12, 76 cleaning, 69 to 72 disabling buttons, 58, 6 7 distance from sc reen, 14, 93 feet, adjusting height with, 37 lamp specifications, 94 password p.
Index 111 T Technical support, 9, 91 to 92 Temperature light, 79 to 80 requirements, 95 Theatre color mode, 40, 54 Timer, lamp, 75 Tint setting, 54 Tracking, adjusti ng, 56, 86 to 87 Transporting proj.
112 Index.
An important point after buying a device Garmin 821P (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Garmin 821P yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Garmin 821P - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Garmin 821P you will learn all the available features of the product, as well as information on its operation. The information that you get Garmin 821P will certainly help you make a decision on the purchase.
If you already are a holder of Garmin 821P, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Garmin 821P.
However, one of the most important roles played by the user manual is to help in solving problems with Garmin 821P. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Garmin 821P along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
