bose 1800 vi service manual
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bose 1800 vi service manualThe lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated dangerous voltage within the system enclosure that may be of sufficient magnitude to constitute a risk of electric shock. Il simbolo del lampo con la freccia, racchiuso in un triangolo equilatero, avverte l’utente che all’interno dell’apparecchio vi sono parti non isolate sotto tensione di. The 1800-VI amplifier is rated at 600 watts per channel into 4 ohms and 450 watts per channel into 8 ohms. In bridged mono operation, it is rated at 1400 watts into 8 ohms. The Bose Model 1600-VI amplifier requires an average of 4.2 amps for 120V versions (2.2 amps for 230V versions). 4.5 Magnetic leakage considerations You can mount the Bose Model 1800-VI or 1600-VI amplifier without concern for magnetic flux leakage. Use shielded coaxial cable to conduct the signal from the source (mixer, equalizer, CD player) to the amplifier. Pin 1 is ground (see Figure 3). Figure 3 Quick connect terminal block balanced input connection. To reference the input differential amplifier for the correct gain, short pin 3 to pin 1 (see Figure 5).To reduce the sensitivity by 6 dB to 1.5V rms, simply remove JP100(CH1) and JP200(CH2), located on the main amplifier board (see Figure 7). Figure 7 Input sensitivity modification. The greater the distance between the amplifier and the speakers, the larger the diameter the wire should be. This will minimize power losses across the wire and improve damping of the speaker. Wire thickness specifications (gauges) get larger as the wire gets thinner. A sample set up might involve one Model 1800-VI amplifier driving two channels of 502A loudspeakers in stereo mode. A second Model 1800-VI amplifier could be added to drive a 502B module. Refer to an authorized Bose Service next to the fuse holder. Center for evaluation. For more information, please read the warranty card.http://vernalis.ru/upload_files/bosch-inline-pump-manual.xml
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Service If you experience problems with your Bose Model 1800-VI or 1600-VI Professional Stereo Power Amplifier, contact your authorized Bose Professional Products dealer. The dealer will verify any defects and arrange for service. El 1800-VI es un amplificador de dos canales de gran potencia que proporciona 450 vatios por canal sobre 8, 600 vatios por canal sobre 4, o 1400 vatios puenteado sobre una carga de 8. English. AtencionEnglishWhere to find.English. For the quick connect terminal block, use the female connector provided. Pin 3 carriesEnglishEnglishEnglishEnglishEnglishWarranty periodEnglishModel 1800-VI amplifier sensitivity Model 1600-VI amplifier sensitivityBose Corporation, The Mountain Bose s.p.A., Via della Magliana 876. The Mountain, Framingham. Search results for: (found: ) ask for a document File Date Descr Size Popular Mfg Model: Found in chassis2model: Found in repair tips. Please do not offer the downloaded file for sell only use it for personal usage. Looking for other manual? For this no need registration. May be help you to repair. You could suffer a fatal electrical shock. Instead, contact your nearest service center. Note! To open downloaded files you need acrobat reader or similar pdf reader program. In addition, Also some files are djvu so you need djvu viewer to open them. These free programs can be found on this page: needed progs If you use opera you have to disable opera turbo function to download file. If you cannot download this file, try it with CHROME or FIREFOX browser. Translate this page: Relevant AUDIO forum topics: Bose Lifestyle CD-20 FLC kijelzo halvany Sziasztok! A fenti keszuleknek halvany a kijelzese. Eleg erdekesen van megoldva a kijelzo tapfesze, sokban fugg a bejovo 12VAC feszultsegtol. Kerdesem az lenne, hogy a futest probaljam emelni, vagy a -24V-ot. A D8-on a 30V is kevesebb, de az AC 4.5V is. Melyik befolyasolja jobban a fenyerot. A futes, vagy a negativ tapfesz?http://mcaschool.com/files/fckeditor/bosch-injector-service-manual.xml Basszus vegfoka 2-3mp mulva megfut vagy pozitivba vagy negativba ha nincs a hangszoro rarakva, hangszoroval azonnal letilt, (amikor a kimeneten eljut DC 4V-ig a vedelem lekapcsolja relevel az erositot). Mikor a MUTE hibat kerestem, volt olyan eset is, hogy nem futott meg a kimenet es szolt a basszus rendesen, de ujboli bekapcsolaskor ha nem halkitottam le a potit akkor kikapcsolt a rele, ha lehalkitottam akkor jo lett, de nagyon susogott, arra hasonlitott mint amikor FM radio nincs az allomason, van egy kozos mute tranzisztor az kapcsolja az osszes tobbit, ha azt kiszedtem akkor is megmaradt a susogas, szerintem visszafele jott valamelyik oldalrol ezert szedtem ki mindegyik oldalrol a tranzisztorokat, nem akartam bajlodni vele, hogy honnet jon a susosgas vissza. Mi lehet a gond? Bose Sounddock 1 tapegyseg csati Sziasztok. Egy baratom megkert, hogy talaljak vagy gyartsak egy tapegyseget a Bose dokkolojahoz. Sajnos az eredetiket aranyarban adjak, igy gyartanom kell egyet. Talatam is egy elegans kis 4 pines csatit, de fennakadtam az eredeti csatlakozo labkiosztasan. Talaltam egy rajzot de nem tudom eldonteni, hogy a kabelen levot abrazolja, vagy a dokkoloban levot. Ha valakinek dolga volt ilyennel, es tudna segiteni, kerem ne tartsa vissza magat. Koszonom.. BOSE bekotesi rajz Legyszi legyszi ha valaki tudnasegiteni egy BOSE AMP2440-as erosito bekoteseben,azt nagyon szepen megkoszonem. Ez AUDI A3-asbol van, a steker nincsmeg. Similar manuals: You can write in English language into the forum (not only in Hungarian). One of these I replaced all 28 output transistors to the newer designation, better signal cable and output speaker cable. I believe the audio is cleaner, slightly tighter bass and mids. These amps have powered my 4 BOSE 901 speakers for years. Maybe it is time to upgrade. Comments To purchase 1800 spares or accessories, please contact the company via their website or visit an authorised retailer.https://www.thebiketube.com/acros-bosch-pdo-multi-manual-pdf Learn more - opens in a new window or tab This amount is subject to change until you make payment. For additional information, see the Global Shipping Programme terms and conditions - opens in a new window or tab This amount is subject to change until you make payment. If you reside in an EU member state besides UK, import VAT on this purchase is not recoverable. For additional information, see the Global Shipping Programme terms and conditions - opens in a new window or tab Estimated delivery dates - opens in a new window or tab include seller's dispatch time, and will depend on postal service selected. Delivery times may vary, especially during peak periods. 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Estas marcas de A TENCION estan situadas en la parte posterior del amplificador de potencia estereo pr ofesional Modelo 1800-VI o 1600-VI. Page 4 4 English 1.0 Safety Information Nederlands Waarschuwing Om het gevaar voor brand of elektrische schokken te verminder en, mag het toestel niet aan regen of vocht wor den blootgesteld.https://www.firstimpressionspro.com/images/bose-1800-vi-manual.pdf Deze waarschuwingssymbolen bevinden zich op de achterkant van de Model 1800-VI en 1600-VI professionele ster eo vermogensversterker. It is backed by state-of-the-art engineering and manufacturing techniques to bring you the best in quality craftsmanship and reliable performance. 2.1 Unpacking the amplifier Carefully unpack your amplifier. Page 7 7 English 4.0 Installation 4.1 Location and general pr ecautions Locate the unit where it will not be exposed to rain or moistur e. If fluid or a for eign object enters the unit, disconnect the power plug. Do not pull by the cord; grasp the plug firmly. Use shielded coaxial cable to conduct the signal from the source (mixer, equalizer, CD player) to the amplifier. Page 9 9 English 4.0 Installation For the quick connect terminal block, use the female connector pr ovided. Pin 1 is ground (see Figur e 3). T o r eference the input dif ferential amplifier for the cor rect gain, short pin 3 to pin 1 (see Figure 5). Page 11 11 English 4.0 Installation 4.7 Input sensitivity The amplifier input sensitivity is set to 0.775V rms for rated output. T o reduce the sensitivity by 6 dB to 1.5V rms, simply remove JP100(CH1) and JP200(CH2), located on the main amplifier board (see Figur e 7). Page 12 12 English 4.0 Installation 4.8 Output wiring Use heavy gauge wire for speaker connections. The gr eater the distance between the amplifier and the speakers, the larger the diameter the wir e should be. This will minimize power losses across the wir e and improve damping of the speaker. Page 13 13 English 4.8.3 Bridged mono Figur e 8 Bridged mono connection. Page 15 15 English 5.3.1 Power switch The power switch is used as a functional switch and should not be r elied upon as a safety disconnect. 100 volt and 120 volt versions: Press to turn the power ON or on ST ANDBY. When ON, the READY indicators will illuminate. For NORMAL STEREO operation, use CH 1 and CH 2 inputs.www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1626a94dd0e984---computrainer-cs-manual.pdf If equalizer car ds are installed, this signal has passed thr ough the internal equalizer, but has not passed through the amplifier itself. Page 18 18 English 5.0 Operation 5.4.9 Speaker outputs Multi-way binding posts connect the loudspeakers to the amplifier outputs. The black terminals are internally tied together and to signal gr ound. For more information, please read the warranty card.We should do this for several simple reasons: First of all view first pages of the manual, you can find above. You should find there the most important technical data Bose 1800-VI - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Bose 1800-VI you will learn all the available features of the product, as well as information on its operation. The information that you get Bose 1800-VI will certainly help you make a decision on the purchase. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Bose 1800-VI. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Bose 1800-VI along with tips on how to solve them. Contact an authorized dealer or service center. Figure 3 Quick connect terminal block balanced input connection. For DUAL MONO or BRIDGED MONO operation, use CH 2 input only. For more information, please read the warranty card. This collection should help you to get through almost any Bose manufactured product. Please note, it took a lot of time to achieve such a compilation. Some of the scanned documents might not be the best quality but still are readable. Over 450 different documents sorted through four folders for easier trace. Please note. As the contents can be easily replicated, we cannot accept any returns as it will be a breach of safe trade policy.You are the light of the world. These are COMPLETE BOSE original manuals!!! All the manuals in this DVD ( PC and Mac) are in PDF files (Adobe ReaderXI) or in JPG files, 510 manuals files!!!. The files are not compressed to save on DVD cost. You will see all the files as you open it in your PC or Mac computer. All the files are listed by models, so very easy to find the critical information. You will always have all the informations of your gear with you to give to your repair shop. Note: Shipping time is about 2-4 weeks in average all around the world by regular air postal service. All files are in PDF Adobe Reader XI version (that can be easily downloaded free on the web) or JPG files. Sometimes, Bose don't include the schematics in the service manual, since they want to sell complete replacement assembly units to make more money. If you need a particular schematics for your repair, just ask me before buying. FOR CANADIAN BUYERS ONLY: SALES TAXES (GST, PST, HST) will be added in the Ebay final invoice. No Sales Tax for USA and International buyers. If you need 1 or 2 service manuals file to beging a fast repair or If you need specific manuals not on the list below, just send me a message and I will be pleased to help you. Need all those files fast by email. No problem, just send me a message when you will buy.You are the light of the world. Super high amount of views. 0 sold, 1 available. More Super high amount of views. 0 sold, 1 available. You are the light of the world. Please check your inbox, and if you can’t find it, check your spam folder to make sure it didn't end up there. Please also check your spam folder. The lightning flash with ar rowhead symbol, within an equilateral triangle, is intended to aler t the user to the presence of uninsulated dangerous voltage within the system enclosure that may be of sufficient magnitude to constitute a risk of electric shock. The exclamation point within an equilateral triangle, as marked on the system, is intended to alert the user to the presence of important operating and maintenance instr uctions in this owner’ s guide. Information about products that generate electrical noise If applicable, this equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to pr ovide reasonable pr otection against harmful interfer ence in a residential installation. This equip- ment generates, uses, and can radiate radio fr equency ener gy and, if not installed and used in accordance with the instructions, may cause har mful interference to radio communica- tions. However, this is no guarantee that interference will not occur in a particular installa- tion.Estas marcas de A TENCION estan situadas en la parte posterior del amplificador de potencia estereo pr ofesional Modelo 1800-VI o 1600-VI. El simbolo de relampago dentr o de un triangulo equilater o indica al usuario que en el interior de la carcasa del sistema existen tensiones peligr osas no aisladas de intensidad suficiente como para repr esentar un riesgo de sufrir una descar ga electrica. El signo de admiracion dentro de un triangulo equilater o, como el que apar ece marcado en el sistema, indica que en la guia del usuario se ofr ecen instrucciones de manejo y mantenimiento importantes PELIGRO DE DESCARGA ELECTRICA NO ABRIR ATENCION: PARA REDUCIR EL RIESGO DE SUFRIR UNA DESCARGA ELECTRICA, NO RETIRE LA CUBIERTA (NI LA TAPA TRASERA).I simboli di A VVER TIMENTO qui riprodotti rappr esentano i simboli che si tr ovano sul pannello posteriore degli amplificatori di potenza ster eo pr ofessionale Modello 1800-VI e Modello 1600-VI.Il punto esclamativo all’interno di un triangolo equilatero, come pr esente sul sistema, avverte l’utente dell’esistenza di importanti istruzioni d’uso e di manutenzione contenute in questo manuale. Italiano PRECAUCION A TTENZIONE Deze waarschuwingssymbolen bevinden zich op de achterkant van de Model 1800-VI en 1600-VI professionele ster eo vermogensversterker.Het uitroepteken in een gelijkzijdige driehoek, zoals op het apparaat gebruikt, dient om de gebruiker erop attent te maken dat deze gebruiksaanwijzing belangrijke instructies voor bediening en onderhoud bevat. LET OP Keep the original carton and packing materials for possible future use. Check for any visible signs of damage. If the amplifier appears damaged, do not try to use it. Notify the Bose Product Support or your authorized Bose Pr ofessional Pr od- ucts dealer. 3.0 The Bose Model 1800-VI and 1600-VI Pr ofessional Stereo Power Amplifiers The Bose Model 1800-VI and 1600-VI Professional Ster eo Power Amplifiers ar e specially designed for professional sound applications. Their rugged construction and low pr ofile allow each amplifier to sustain the abuses of the road with r eliability and space-saving economy. Also, their accurate sound and ample power make these amplifiers ideal for critical studio applications. The 1800-VI amplifier is rated at 600 watts per channel into 4 ohms and 450 watts per channel into 8 ohms. In bridged mono operation, it is rated at 1400 watts into 8 ohms. The 1600-VI amplifier is rated at 325 watts per channel into 4 ohms and 240 watts per channel into 8 ohms. In bridged mono operation, it is rated at 700 watts into 8 ohms. The sophisticated protection cir cuits designed into each amplifier will pr otect your system from unexpected faults. They also pr otect each amplifier fr om excessive temperature, continuous current limiting, and shorted outputs. The balanced inputs of each amplifier use a high quality, high common-mode rejection differ ential amplifier for exceptional hum and noise rejection. In addition, both the 1800-VI and the 1600-VI amplifiers are equipped with an input boar d that allows differ ent equalization for each channel (pr ovided the correct equalization car d is installed). A sample setup might involve one Model 1800-VI amplifier driving two channels of 802 loudspeakers in stereo mode. A second Model 1800-VI could be added to drive a 502B module. Alternatively, just one amplifier could be used to drive the 802 loudspeakers on one channel and the 502B module on the other channel. Many configurations ar e possible using the four loudspeakers above. This flexibility can be achieved by installing the EQ car ds for the desired setup. 2.0 Before Y ou Begin Do not pull by the cord; grasp the plug firmly. Place the unit where it will be pr otected fr om heat and allow adequate ventilation. Place it away from dir ect heat sources, such as heating vents and radiators. Use four scr ews with washers to pr event marring the front panel. Neo- pr ene rubber washers are a good choice because they grip the scr ew head and prevent the screws fr om backing out in the event of vibration or if the unit is transported. 4.2.1 Rear support for road applications If either unit is rack-mounted and the rack is transported, you must mechanically support the rear of the amplifier. Y ou can place a shelf across the r ear of the amplifier or brackets in such a way as to support the rear of the unit. This practice is r ecommended for all electronic instruments. 4.3 Thermal considerations When either amplifier is used free-standing, no thermal considerations ar e necessary other than keeping the ventilation holes open. If the unit is rack-mounted, allow for adequate ventilation exits in fr ont of and behind the amplifier. When several amplifiers are mounted together in a rack, you may need to pr ovide air inlets from the outside of the rack. The unit is fan cooled. The fan is internally mounted so that it draws air in from the fr ont and exhausts it out the rear. This allows cool air from outside the amplifier to flow over and cool the power supply components located in front of the heatsinks. These amplifiers may be stacked dir ectly on top of each other without spacer panels. If an amplifier is used with other amplifiers, be sur e the heat output from each amplifier does not interfer e with the ventilation of the others. 4.4 AC power considerations Be sur e to plug your amplifier into an outlet capable of supplying the correct voltage specified for your model. Check to be sur e there is enough curr ent to allow full-power operation of all the amplifiers in your system. The power plug serves as the Main Disconnect device and should always be easily accessible after installation. The current demand of a power amplifier varies depending on the impedance of the load, the output level of the amplifier, and the crest factor and duty cycle of the pr ogram material. For example, consider typical conditions repr oducing r ock music, with both channels driven into 4 ohms to the point where musical peaks ar e just at the clipping point. The Bose Model 1600-VI amplifier requir es an average of 4.2 amps for 120V versions (2.2 amps for 230V versions). 4.5 Magnetic leakage considerations Y ou can mount the Bose Model 1800-VI or 1600-VI amplifier without concern for magnetic flux leakage. However, it is not a good idea to mount any power amplifier near a micro- phone input transformer or magnetic storage media. For the XLR, use a male XLR connector. Pin 1 is gr ound (see Figur e 2). Figure 2 XLR balanced input connection. Pin 1 is ground (see Figur e 3). If you are using the standar d input module for either amplifier, the polarity of the balanced inputs can be reversed by changing four jumpers located on the input boar d, just behind the input connectors. If you are using the ACM-1 module for either amplifier, the polarity cannot be reversed. The tip of the plug carries the signal and the sleeve is gr ound. The ring connection in the jack is automatically grounded by the sleeve (see Figur e 4).Short pin 2 to pin 1 in or der to r eference the input dif ferential amplifier for the correct gain (see Figur e 6). Figure 6 Quick connect terminal block unbalanced input connection. 4.0 Installation Note The gain remains the same r egardless of whether the input is balanced or unbalanced. T o reduce the sensitivity by 6 dB to 1.5V rms, simply remove JP100(CH1) and JP200(CH2), located on the main amplifier board (see Figur e 7). Figure 7 Input sensitivity modification. The gr eater the distance between the amplifier and the speakers, the larger the diameter the wir e should be. Wire thickness specifications (gauges) get larger as the wir e gets thinner. So a 14-gauge wire is thicker than 18-gauge wire. Use the following chart as a guide. Wire Length Gauge of Wire Up to 15' 18 gauge 15' to 25' 16 gauge 25' to 40' 14 gauge 40' to 60' 12 gauge 60' to 100' 10 gauge 100' to 150' 8 gauge 150' to 250' 6 gauge This will keep the resistance of the speaker wir e to less than 5 of 4 ohms and the transmission loss to less than 0.5 dB. The multi-way binding posts can accept spade lug, bar e wire, or banana connections. Be sure all the fine strands of the wir e ar e twisted together and contained within the connector. If even one strand is loose and can touch the adjacent terminal, a short circuit may r esult. Y ou must use Class I (NEC) wiring. 4.8.1 Polarity In order to have cor rect phasing between loudspeakers, you must connect them with consistent polarity. While incorrect phasing will do no physical harm, it will diminish your bass r esponse. The key is to make sure both speakers ar e connected to the speaker terminals the same way. Connect the input signal to CH 2 input (CH 1 input becomes disabled). Connect the speakers to the speaker outputs on the amplifier just as for normal ster eo operation. Both speaker outputs will carry the signal connected to the CH 2 input. Connect the input signal to CH 2 input (CH 1 input becomes disabled). When connected in this way, each channel “sees” half the impedance of the speaker connected between them. If you use an 8 ohm speaker, each channel will see a 4 ohm load. Therefor e it is not recommended that you use any load lower than 8 ohms in this mode of operation. Use parallel mono operation for lower impedances. Note Be sur e to set both of the input level controls to the exact same setting for equal power distribution per channel. Switching the level defeat switch (located on the amplifier) to OFF will assure that both channels ar e operating at the same level. 4.8.4 Parallel mono Parallel mono operation is useful when running sustained high levels in a single load or when driving a low impedance load. It has no ef fect until the signal r eaches the clipping point. The larger the input signal, the mor e it is r educed to keep the output just below clipping. The clipping eliminator circuit is operational at the point of manufactur e. However, you can defeat it by using the clipping eliminator defeat switch. This switch is located on the rear panel of the amplifier. Moving the switch up will re-engage the clipping eliminator. Note If you turn the input level down far enough, a sufficiently large input signal can drive the input differ ential amplifier into clipping. The clipping eliminator cir cuit cannot remedy this. It also has no effect on clipping that occurs prior to the amplifier inputs, such as at the mixer or equalizer. CAUTION In bridged mono operation, the output connections are actually a balanced output configuration. This means both output terminals have voltage pr esent (neither may be grounded).Then advance them slowly, one at a time, to verify that each channel is operating correctly. Set input level controls high enough to allow the pr eceding device to drive the amplifier to full output. Usually, this is wide open (fully clockwise). Mark down the settings, either on paper or self-stick dots attached to the front of the amplifier. In bi-amplified (multi-amp) systems, start with the low fr equency amps turned down or off. Each channel of the input module has its own equalizer car d input connector, which allows differ ent equalization for each channel (pr ovided the correct EQ car d is installed). For a view of the input module, refer to Figur e 10 on page 16. A sample set up might involve one Model 1800-VI amplifier driving two channels of 502A loudspeakers in ster eo mode. A second Model 1800-VI amplifier could be added to drive a 502B module. Alternatively, just one amplifier could be used to drive the 502A loudspeakers on one channel and the 502B module on the other channel. Many configurations are possible using the four loudspeakers above. This flexibility can be achieved by installing the EQ cards for the desir ed setup. For a view of the ACM-1 module, r efer to Figure 11 on page 16. 5.2.2 ACM-1 amplifier control module The Bose ACM-1 amplifier control module is designed to establish network contr ol of the Bose 1800-VI or 1600-VI amplifier. The module also pr ovides amplifier monitoring capa- bility. Using the graphical user interface of the ACM-1 module software, settings like amplifier output, amplifier load, temperature, and clip levels can be checked r outinely. Refer to the ACM-1 installer’ s guide for complete installation instructions. 5.3 Front Panel 1. Power switch 2. Standby LED 3. AC power fuse 4 1 23 5 Figure 9 Front panel of the 1800-VI amplifier (generally identical to the 1600-VI amplifier front panel) 4. Level controls 5. Status indicators 6. Data receive indicator 6 When ON, the READY indicators will illuminate. In the ST ANDBY mode, the unit is off but can be activated through the SEQUENCE connector on the r ear panel of the amplifier. Be sure all connections are made and double checked befor e switching the power amplifier ON. Note Standby (see above) and Sequencing (see below) modes ar e activated at the amplifier only when using the standard input module. For the ACM-1 module, these modes ar e estab- lished via the network. For further detail, refer to instructions included with the network. 220-240 volt version: This version has separate POWER and SEQUENCE switches on the front panel. Pr ess the POWER switch to turn power on (1) or off (0). When the unit is of f, no power reaches the unit and the sequencing function is not active. T o use the amplifier in the normal mode, set the POWER switch on and set the SEQUENCE switch to the of f position ( ). The READY indicators will illuminate. T o activate the sequencing function, the SEQUENCE switch must first be switched to the on position ( ) and then the POWER switch must be tur ned on. The unit will then be in a standby mode and can be activated by the sequence signal. See Section 5.4.8 for additional information regar ding the sequence featur e. 5.3.2 Standby LED Illuminates when the power switch is turned OFF to indicate the amplifier is connected to AC power and the amplifier can be powered up. When the power switch is ON, the standby LED turns off. 5.3.3 AC power fuse Protects the amplifier fr om catastrophic failur es that could damage internal circuitry. Repeated fuse blowing is a sign of internal distress. When fully clockwise, the amplifier operates at maximum gain. T ur ning the controls counter -clockwise attenuates the input signal. Y ou can bypass the Level controls internally to lock the amplifier at its full gain capacity. See the Note about the level defeat switch on page 13. 5.3.5 Status indicators The ON LED illuminates green when the power is on and the amplifier is r eady to operate. The ON LED illuminates red when the power switch is first turned on (while the power supply is stabilizing prior to the speaker output r elays switching in) or when the amplifier is in protect mode.