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Хорошее руководство по эксплуатации
Законодательство обязывает продавца передать покупателю, вместе с товаром, руководство по эксплуатации BenQ W1200. Отсутствие инструкции либо неправильная информация, переданная потребителю, составляют основание для рекламации в связи с несоответствием устройства с договором. В законодательстве допускается предоставлении руководства в другой, чем бумажная форме, что, в последнее время, часто используется, предоставляя графическую или электронную форму инструкции BenQ W1200 или обучающее видео для пользователей. Условием остается четкая и понятная форма.
Что такое руководство?
Слово происходит от латинского "instructio", тоесть привести в порядок. Следовательно в инструкции BenQ W1200 можно найти описание этапов поведения. Цель инструкции заключается в облегчении запуска, использования оборудования либо выполнения определенной деятельности. Инструкция является набором информации о предмете/услуге, подсказкой.
К сожалению немного пользователей находит время для чтения инструкций BenQ W1200, и хорошая инструкция позволяет не только узнать ряд дополнительных функций приобретенного устройства, но и позволяет избежать возникновения большинства поломок.
Из чего должно состоять идеальное руководство по эксплуатации?
Прежде всего в инструкции BenQ W1200 должна находится:
- информация относительно технических данных устройства BenQ W1200
- название производителя и год производства оборудования BenQ W1200
- правила обслуживания, настройки и ухода за оборудованием BenQ W1200
- знаки безопасности и сертификаты, подтверждающие соответствие стандартам
Почему мы не читаем инструкций?
Как правило из-за нехватки времени и уверенности в отдельных функциональностях приобретенных устройств. К сожалению само подсоединение и запуск BenQ W1200 это слишком мало. Инструкция заключает ряд отдельных указаний, касающихся функциональности, принципов безопасности, способов ухода (даже то, какие средства стоит использовать), возможных поломок BenQ W1200 и способов решения проблем, возникающих во время использования. И наконец то, в инструкции можно найти адресные данные сайта BenQ, в случае отсутствия эффективности предлагаемых решений. Сейчас очень большой популярностью пользуются инструкции в форме интересных анимаций или видео материалов, которое лучше, чем брошюра воспринимаются пользователем. Такой вид инструкции позволяет пользователю просмотреть весь фильм, не пропуская спецификацию и сложные технические описания BenQ W1200, как это часто бывает в случае бумажной версии.
Почему стоит читать инструкции?
Прежде всего здесь мы найдем ответы касательно конструкции, возможностей устройства BenQ W1200, использования отдельных аксессуаров и ряд информации, позволяющей вполне использовать все функции и упрощения.
После удачной покупки оборудования/устройства стоит посвятить несколько минут для ознакомления с каждой частью инструкции BenQ W1200. Сейчас их старательно готовят или переводят, чтобы они были не только понятными для пользователя, но и чтобы выполняли свою основную информационно-поддерживающую функцию.
Содержание руководства
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Страница 1
We l c o m e W1100/W1200 Digital P roj ecto r Us e r M a n u a l[...]
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Table of contents 2 Ta b l e o f c o n t e n t s Important safety instructions .. ....................... 3 Introduction . ....................... 7 Projector features .................................. 7 Shipping contents .................................. 8 Projector exterior view .......................... 9 Controls and functions ..............[...]
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Страница 3
Important safety inst ructions 3 Important safet y instructions Y our pr ojector is des igned and test ed to meet the latest standar ds for sa fety of information technology equipment. H owev er , t o ensure safe use of this product, it is important that yo u follow the instructions mentioned in this manual and marked on the product. Safety Instruc[...]
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Important safety inst ructions 4 Safety Instructio ns (Continued) 7. The lamp becomes extremely hot during op eration. Al low the proj ec tor to co ol fo r a pproxi mat ely 45 minut es prior to r emoving the lamp assembly for replacement. 8. Do not operate lamps beyond the rated lamp li fe. Ex cessi ve ope ration of lamps bey ond the rated lif e co[...]
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Important safety inst ructions 5 Safety Instructio ns (Continued) 13. Do not place this p rojecto r in any of the following en vi ronments. - Space that is poorly ventilated or confined. Allo w at least 50 cm clearance from walls and free flow of air around the projector . - Locat ions w here temp eratu res may becom e excess ively hig h, s uch a s[...]
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Страница 6
Important safety inst ructions 6 Safety Instructio ns (Continued) 16. Do not stand the projector on end ver t i ca ll y . D o in g s o may c au s e t he projector to fall over , causi ng injur y or resulting in damage t o the projecto r . 17. D o not step on the projector or place any objects upon it. Besides pr obable ph ysical damage to the proje[...]
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Introducti on 7 In trod uction Pr ojec tor featur es The projector integ rates hig h-perfor mance optical eng ine projection and a user-fri endly design to deliv er high reliability and ease of use. The projector off ers the following features. • 10W x 2 Big speakers •S R S W O W H D TM significantly impr ov es the playback qu ality of audio, d[...]
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Introduction 8 Shipping contents Carefully unpack and verify that you hav e all of the items shown b elow . If any of these items are missing, please contact your place of purchase. St an da rd acce ss or i es The supplied accessories will be suit able for your region, and may differ from those illustrate d. *The warranty card is only supplie d in [...]
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Introducti on 9 Proj e cto r ex te r io r v ie w 1. External control panel (See "P rojector" on page 10 for details.) 2. Lamp co ver 3. Zoom ring 4. Focus ring 5. Lens cov er 6. V ent 7. Speaker 8. Fro nt IR remote sensor 9. Pr ojection lens 10. Quick-release button 11. Kensingt on anti-theft lock slot 12. RGB (PC)/Component v ideo (YP bP[...]
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Introduction 10 Contro ls and func ti ons Proj e c tor 6. BLANK U sed to hid e the scr een picture . See "Hiding th e image " on page 3 5 for detail s. 7. TEMP erature indicat or light Lights up red i f the pr ojector's temperatur e beco mes too high. See "Indicators" on page 55 for details. 8. Power/ PO WER indic ator ligh[...]
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Introducti on 11 Ceiling mounting the projector W e want you to ha ve a pleasant experienc e using y our BenQ pr ojector , so w e need to bring this safety matter to your attention t o prev ent possible damage t o person and propert y . If you in ten d to mo un t yo ur p roj ec tor on the cei li ng , we st ron g ly recom me nd th at yo u use a prop[...]
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Introduction 12 Rem o te c o n t ro l 1. FREEZE Freezes the projected image. See "Fr eezing the image" on page 35 for deta ils. 2. Sourc e selection keys (HDMI-1, HDMI-2, PC, COMP , VIDEO , S-VID EO) Selects an input source for display . See "Switc hing input si gnal" on page 28 for details. 3. BLANK U sed to hide th e screen pi[...]
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Страница 13
Introducti on 13 11. Advanced pi cture quality adjustment k eys (GAMMA, COL OR TEMP , Brilliant Colo r) Displays the setting bars for adjustment o f the appropriate picture qualit y values. Se e "Ad vanced picture q uality controls" on page 32 for details. 12. Power T oggles the projector between standby mode and on. See "Starting up[...]
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Страница 14
Introduction 14 Infra-Red (IR) re mote control sensor is located on the front of the projector . The remote control must be held at an angl e within 22.5 deg rees perp endicular to the projector's IR remot e contr ol sensor t o function c orrectly . The dis tance between t he remot e contr ol and the sensor shou ld not ex ceed 8 mete rs (~ 26 [...]
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Positioning your projector 15 P ositioning your pr ojector Choosing a location Y our room lay out or personal prefer ence will dictate which installation location you select. T ake into consider ation the size and p osition of your screen, the location of a suitable po wer outlet, as well as the location and di stance between the project or and the[...]
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Страница 16
Positioning your project or 16 O btaining a preferr ed projected image siz e The distanc e from the pr ojector lens t o the sc reen, the zoom setting (if available), and the vide o format ea ch factors in the proj ected ima ge size. 16:9 is the nativ e aspect ratio of this projector . The projector should always be placed hor izonta lly level (lik [...]
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Страница 17
Positioning your projector 17 How to deter m in e th e p os it io n of the projector for a giv en screen size 1. Select your scr een size. 2. Ref er to the t able on page 18 and find the closest match to your screen size in the left colu mn s l ab el led "Screen size" . Using this valu e, look acro ss thi s row t o the right to find the c[...]
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Страница 18
Positioning your project or 18 Pr ojection dimensi ons Ref er to "Dim ensions" on page 58 for the ce nter of lens dimensions of this projector before calculating the appr opriate position. There is 3% tolerance among these numbers due to optical component variation s. BenQ recommends that if you intend to permanently install the projector[...]
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Connection 19 Connection When connecting a signa l source to the projector , be sure to: 1. T urn all equipment o ff before making an y conn ections. 2. U se the corr ect signal cables for each so urce. 3. Ensure the cables ar e firmly inse rted. • In the connections shown below , some cables may not be included with the projector (see "Ship[...]
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Connection 20 a function key labeled CRT/LCD or a function key with a mo nitor symbol on the notebook. Press FN and the labeled function key simu ltaneously . Refer to your notebook's documentation to find your notebook's key combination. • The output signal for MONI TOR OUT jack only works when the input signal comes from COMPUTER jack[...]
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Connection 21 Connecting Video sour ce devices Y ou need only co nnect the project or to a Vid eo source device us ing just one of the abov e connecti ng methods, howev er each pro vides a differ ent level of video quality . The method you ch oose will most likely depend upo n the availab ility of matching t erminals on both the projector and the V[...]
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Страница 22
Operat ion 22 Operation Star ting up the projecto r 1. Plug the power cord into the projector and into a power outlet. T urn on th e power outlet s witch (where fitted) . Check that the PO WER indicato r light on the project or lights red after po wer has been applied. • Please use the original accessories (e. g. power cable) only with the device[...]
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Operation 23 Yo u c a n a l s o p r e s s SOURCE on the projector or Source selec tion keys on the remote control to select y our desired input signal. See "Switc hing input signal" on page 28 for details. If the frequency/resoluti on of the input signal exceeds the projector's operating ra nge, you will see the message 'Out of [...]
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Страница 24
Operat ion 24 Fine-tuning the image size and clarity 1. Adjust the pro jected image to the size that you ne ed using the zoom ring. 2. Then sharp en the image by rotating the focu s ring. Correcting k e ysto ne K eystoning r efers to the situation where the pr ojected image is notic eably wider at either the top or bottom. It occurs when the projec[...]
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Operation 25 Us i n g t h e m e n u s The pr ojector is eq uipped with On-Scree n Display (O SD) menus fo r making various adjustments and settings. Below is the overview of the OSD menu. The following example descr ibes how to set the OSD language. 1. Press MENU/EXIT on the projector or remo te co nt rol to tu r n th e O SD men u on . 3. P re ss t[...]
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Operat ion 26 Securing the projecto r U sing a securit y cable lock The pr ojector has to be installed in a safe place to prev ent theft. Otherwise, purcha se a lock, such as the K ensington l ock, to secure the projector. Y ou c an locate a K ensington lo ck slot on the rear side of the projector . See item 11 on page 9 for details. A Ken si n g t[...]
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Страница 27
Operation 27 six-digit passwor d, or if you did not r ecord the pa ssword in this manual, a nd you absolutely do not r emember it, y ou can use th e passwor d recall p rocedur e. See "Entering the passw ord recall p rocedu re" on page 27 for details. If you enter an inc orrect password 5 times in succession, the projector will automatical[...]
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Страница 28
Operat ion 28 i. If the password is correct, th e OSD menu return s to the Security Settings page with 'Off' sho wn in the ro w of Power on Lock . Y ou w il l n ot h ave to en ter the password next time y ou turn on the pr ojector . ii. If the password is incorrect, the pas sword error message disp lays lasting for three second s, and the[...]
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Страница 29
Operation 29 Magnifyi ng and searching for details If y ou need to find the details on th e project ed picture, magnify the picture . U se the directio n arrow k eys for na vigating the pictur e. • U sing the OSD m enu 1. Press MENU/EXIT and then press / until the DISPLAY menu is hig hlighte d. 2. Press to h ig hl ig ht Digital Zoom and press MOD[...]
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Operat ion 30 2. Rea l : The image is projected as its original resolution, and resiz ed to fit within the display area. For input signals with lower resolutions, the project ed image wi ll display smaller than if re sized to full screen. Y ou could adjust the zoom setting or mov e the project or to wards the screen t o increase the image siz e if [...]
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Страница 31
Operation 31 Optimizing the i mage Selectin g a pictu re mod e The projec tor is preset wi th severa l predefined pic ture modes so that yo u can choo se one t o suit y our operating environment and input signal pic ture ty pe. T o select an operation mod e that suits your need, you can follow one o f the following steps. •P r e s s MO DE/ENTER o[...]
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Operat ion 32 Fine-tuning the image quality No matter what pict ure mode you ha ve s elected, you a re able t o fine-tune those settings t o fit every presen tation pur pose. Those a djustments w ill b e sav ed to the preset mode you are at when you exi t the OSD me nu . High light PICTURE: Basic menu, press to select a sub- menu it em to be c hang[...]
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Operation 33 High light Detail Enhancement and pr ess / to adjust the value fr om 0 to 10 t o enhance the image . Selecting a Color Temperat ure High light Color Temperatur e in the PICTURE: Advanced menu and adjust th e values by pressing / on the projector or rem ote control. Choose a prefer red color temperature from among W armer/W arm/Normal/C[...]
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Operat ion 34 This adjustable it em utilizes a ne w color -proc essing algorithm and system level enhancements to enable hig her brig htness w hile providing tr ue, more vibr ant colors in picture. The ra nge is from 1 to 3. If you prefer a stronger enhanced image, adjust toward the maximum set ting. For a s moother , more na tural image, adju st t[...]
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Страница 35
Operation 35 6. P re ss t o high light Gain and ad just its values to your preference by pressing / . The contrast level of the primary color y ou select w ill be affected. E ver y adjustment made will re flect to the ima ge immediately . 7. Repeat st eps 3 to 6 for other color adjustments. 8. Make sure you hav e made al l of the des ired adjust me[...]
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Страница 36
Operat ion 36 Press FREEZE on the remote control to freeze the image. Th e word ' FREEZE ' will display in the screen. T o release th e function, press any key on the pro je ctor or remo te cont rol . Ev en if an image is frozen on the screen, the pictures are running on the video or othe r device. If the c onnect ed devices hav e activ e[...]
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Operation 37 • Usin g t he remo te c ont rol Press MUTE to tempor arily tur n off the soun d. T o restore the sound, press MUTE again. • U sing the OSD m enu 1. Press MENU/EXIT and then press / until the AUDIO SETUP m en u i s hi ghl igh te d. 2. Press to highlig ht MUTE and press / to select On . 3. T o restore the sound, repeat st eps 1-2 and[...]
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Operat ion 38 To d i s p l a y t h e P I P w i n d o w : • Usin g t he remo te c ont rol Press PIP to displa y the PIP page and make adj ustments by follow ing the steps starting from step 3 in the section "Using the OSD menu" belo w . When the PIP window is on, to change the PI P window size, press PIP Size re peatedly until a desi red[...]
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Страница 39
Operation 39 P ersonalizin g the pr oject or menu displa y The On-Screen Dis play (OSD) menus can be set according to your prefer ences. The following settings do not af fect the projecti on settin gs, op erati on, or per forma nce. • Menu display time in the SYSTEM SE TUP > Menu Settings menu sets the length of time the OSD will remain active[...]
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Operat ion 40 Me n u o p e r a t i o n M enu system Please note th at the on-scree n display (OSD) menus vary acco rding to the signal type selected. Main menu Sub-menu Options 1. PICTURE: Basic Picture Mode Dynamic/S tandard/Cinema/ISF Day(for W1200 only)/ ISF Night(for W1200 only) /User 1/User 2/User3 Reference Mode Dynamic/S tandard/Cinema Brigh[...]
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Operation 41 3. DISPLAY Aspect Ratio Auto/16:9/4:3/Letter Box/Real Keystone Auto Keystone On/Off Keystone Overscan Adjust ment Overscan Save by current Digital Zoom PC & Compone nt YPbPr Tuning Auto/H. Size/Phase/Horizontal Position/V ertical Position/SOG Level SOURCE Quick Auto Search On/Off Color S pace Conversion Auto/RGB/YUV HDMI Settings H[...]
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Страница 42
Operat ion 42 Note that the menu items are available when the projector detec ts at least one valid sig nal. If there is no equipment conne cted to the projector or no signa l detected, limited menu items are acc essible. 5. SYSTEM SETUP Language Projector Position Front T able/Rear T able/Rear Ceiling/Front Ceiling Menu Settings Menu display time [...]
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Страница 43
Operation 43 Description of each menu • The default values lis ted in this manual, espe cially on pages 43-48 , are for reference only . They may vary between the projectors due to the continuous improvement to the products. FUNCTION DESCRIPTION Picture Mode Pre-de fined picture modes are pr ovided so you can optimiz e your project or image set-u[...]
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Страница 44
Operat ion 44 FUNCTION DESCRIPTION Clarity Control See "Adjusting Clarity Co ntrol" on page 32 for details. Color Temperature See "Selecting a Color T emp erature" on page 33 for details. Color Temperature Fine-Tuning See "Fine-T uning a Color T emperature" on page 33 for details. Gamma Selection Selects g amma mode th[...]
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Страница 45
Operation 45 FUNCTION DESCRIPTION Aspect Rat io Ther e are fi ve options t o set the image's aspect ratio depending on your inpu t signal source. See "Selecting the aspect ratio" on page 29 for details. Keystone Co rrects any keystoning of the image automatically or manually . See "Corr ecting keystone" on page 24 for detai[...]
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Страница 46
Operat ion 46 FUNCTION DESCRIPTION SRS See "T urning on /off the SRS" on page 36 for detail s. Mute See "M uting the sound" on page 36 for details. Vo l u m e See "Adjusting the sound lev el" on page 37 for details. Tr e b l e See "Adjusting the T reble lev el" on page 37 for details. Bass See "A djustin[...]
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Страница 47
Operation 47 FUNCTION DESCRIPTION Language Sets the language for the On-Screen Display (OSD) menus. S ee "Using the menus" on page 25 for details. Projector Position The project or can be installed o n a ceiling or be hind a screen, or with one or mo re mirro rs. See "Choosing a location" on page 15 for details. Menu Settings Me[...]
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Operat ion 48 FUNCTION DESCRIPTION High Altitude Mode A mode for o peration in high altitude areas. See "Operating in a high altitude environment" on page 36 for det ails. Lamp Settings Lamp Mode See "Setting Lamp Mode as Economic" on page 50 for detai ls. Reset lamp timer See "R esetting the lamp timer" on page 54 for[...]
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Maintenance 49 M aintenanc e Care of the pr ojector Y our pr ojector needs l ittle mainte nance. The only thing you need to do o n a regular bas is is to keep the lens and case clean. Nev er remov e an y parts of the project or exc ept the lamp . Contact y our dealer if other parts need re placing. Cleaning the lens Clean the lens whene ver you not[...]
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Maintenance 50 Lamp information Getting to kno w the lamp hour Whe n the proj ector is in operation, the du ration (in hours) of lam p usage is aut omatically calculated by the built-in timer . See "Setting Lamp Mode as Economic" below for more information on Economic mode. T o obtain the lamp hour information: 1. Press MENU/EXIT and then[...]
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Страница 51
Maintenance 51 T iming of r eplacing the lamp When the Lamp indicator lights up r ed or a message appears sugg esting it is time to r eplace the lamp , please install a new lamp o r consult y our dealer . An old lamp may cause a malfunction in th e project or and in some i nstances the lamp may e xplode. Go to http://lamp .benq.com for a replacemen[...]
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Страница 52
Maintenance 52 R eplacing the lamp • Hg - Lamp cont ains mercury . Manage in accor dance with local disposal laws. See www .lamprecycle.org. • If lamp replacement is performed while the projector i s suspended upside-down from the ceiling, make sure that no one is underneath the lamp socket to avoid any possib le injury or damage to the human e[...]
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Страница 53
Maintenance 53 3. Re move th e lamp co ver b y (a) sliding the cov er towar d the side of the project or and (b) lifting it off. • Do not turn the power on with the lamp cover removed. • Do not insert your fingers between the lamp and the projector . The sharp edges inside the projector may cause inj uries. 4. Loosen the screws tha t secure the[...]
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Страница 54
Maintenance 54 11. Restart the pr ojector . Do not turn the power on w i th the lamp cover removed. Res etting the lamp timer 12. After the star tup lo go, open the On-Screen Display ( OSD) m enu. Go to the SYSTEM SETUP > Lamp Settings menu. Pr ess MODE/ ENTER . The Lamp Settings page displa ys. Press to highlig ht Reset Lamp Timer and press MOD[...]
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Maintenance 55 Ind ic ato rs Light S tatus & Description POWER TEMP LAMP Power events Red Off Off Stan d-by mode Green Flashing Off Off Pow e r i n g up Green Off Off Normal operation Red Flashing Off Off The projector needs t o cool for 90 seconds after the po wer is turne d off. Lamp events Off Off Red The project or has shutdo w n automatica[...]
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Troubleshooting 56 T r oubleshooting The projector does not turn on. No pi c t u r e Blurred image Remot e control d oes not work The password is incorrect Cause Remedy There is no power from the power cable. Plug the power cord into the AC inle t on the projector , and plug the po wer cord into the power outlet. If the power outlet has a switch, m[...]
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Specifications 57 Specifications All specifications are subject to change without notice. Optical Resolution 1920x1080, 1080p Display system 1-CHIP DMD Lens F/Number F = 2.41 t o 2.91 f = 20.72 to 31 mm Lamp 230 W lamp Electrical Power supply AC100–240V , 3.70A, 50-60 Hz (Automat ic) Power consumption 320 W (Max); < 1 W (S tandby) Mechanical W[...]
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Specifications 58 Dimensions 339.2 mm (W ) x 138.8 mm (H) x 260.6 mm (D) Ceiling mount installation 339.2 260.6 138.8 66.3 91.6 1 10.5 150.0 25.0 0.5 23.5 237.5 40.5 120.6 65.0 339.2 166.9 100.00 1 16.00 Ceiling mount screws: M4 x 8 (Max. L = 8 mm) U nit: mm[...]
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Страница 59
Specifications 59 Ti m i n g ch a r t Suppo r ted timing for PC input Resolution Horizont al Frequency (kHz) Ve r t i c a l Frequency (Hz) Pixel Frequency (MHz) Mode 640 x 480 31.469 59.940 25.175 V G A_60 37.861 72.809 31.500 V G A_72 37.500 75.000 31.500 V G A_75 43.269 85.008 36.000 V G A_85 720 x 400 31.469 70.087 28.3221 720 x 400_70 800 x 600[...]
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Страница 60
Specifications 60 Suppo r ted timing for HDMI input Resolution Horizont al Frequency (kHz) Ve r t i c a l Frequency (Hz) Pixel Frequency (MHz) Mode 640 x 480 31.469 59.940 25.175 V G A_60 37.861 72.809 31.500 V G A_72 37.500 75.000 31.500 V G A_75 43.269 85.008 36.000 V G A_85 61.910 119.518 52.500 V G A_120 720 x 400 31.469 70.087 28.3221 720 x 40[...]
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Страница 61
Specifications 61 Displaying a 1080i(1 125i)@60Hz or 1080i(1 125i)@50Hz signal may resul t in slight image vibration. Supported timing for Component-YP b P r input Supported t iming for Video and S-V ideo inputs VIDEO (HDCP) 15.73 59.94 27 480i 15.63 50i 27 576i 31.47 59.94 27 480p 31.25 50p 27 576p 44.96 59.94 74.25 720p60 37.50 50p 74.25 720p50 2[...]
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Страница 62
Warranty and Co pyright information 62 W ar r anty and Copyr ig ht information P atents for W1100/W1200 This BenQ project or is cov ered by the following patents: U .S. patents 6,837,608; 7,275,834; 7,181,318; TW patents 202690; 205470; I228635; I259932; China P atents ( 中国发明专利 ) ZL01143168.7; ZL03119907.0; ZL200510051609.2 Limited warr[...]
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Страница 63
Regulation stat ements 63 R e gulation statements FCC statement CLASS B : Thi s equipment gene rates, uses and can radiate radio fr equency energy and, if not installed and used in accordance with the i nstruc tions, may cause harm ful interference to radio communication s. Howev er , there is no guarantee that interference will no t occur in a par[...]
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Страница 64
Regulation state ments 64 A ccessibility R equirements for R e habilitation A c t of 1973, Section 508 BenQ’ s commitm ent to accessi ble produc ts al lows us to su ppor t government in mak ing accessible technol ogy choices BenQ’ s LCD monitor s and proj ectors a re complian t w ith Section 508 guidelines b y including the assi stive f eatures[...]
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Страница 65
Regulation stat ements 65 • The mains lead (power cable) on the Projector co mes with a moulded plug incorporating a fuse. • The rating of the fuse is indicated on the pin face of the plug and, if it requires replacing, a fuse approved by AST A or BSI to BS 1362 of the same rating must be used. • If the plug has a detachable f use cover , rem[...]