Adcom GFA-5400 AV receiver
Contents
1.2. esses eme em eene I nr ire insere rese a llli lll p dili un 1 7dB Signal to Noise Ratio A Weighted 125 watts onto 8 OMMS c cece cececccccecsscsesecsnsseseeseaseseverscrccesevevenesceses gt 100dB LI eem Pu CI EEM 29 dB ji amp leri po c 49 9K ohms Input Sensitivity BOE ANY MUU UU een nee an et 0 1 volts RNA Walls UNTO cR CPC 1 125 voits Damping Factor 20Hz to 20KMHaz nu e dd 2 500 Rise Time 5kHz 90 V peak to peak square wave 20 to 8096 Ree e emen 1 9 uS Power Consumption Continuous Both Channels Driven Girls Wem V 150VA A tote eects csc ee mee sete as A N EREEREE 960VA 129 WAUS ITO BORIS eee sada ae ee esse 580VA 200watts IO s ohms uo codo ee atu d ech een 920VA Power Available in 230VAC by special Orden occoooocconcccccorcnononoconococonororonnraronnoncnonrcronnononnconarcnns 115VAC 50 60Hz Chassis Dimension c ccceeseeseveeesevevecececececccccccececceececececeeseceeeeeaecaes 9 127mm x 17 432mm x 11 292mm Maximum Dimensions ccccccccccccccccsescceseeecececesesesersceeuceuseusaceeeecneaeens 5 137mm x 17 432mm x 12 375mm Well sd uu c Ei ASA Pen DDS rae M LN ES eausa EN 26 Ibs 11 8kg Weight PACK OG E eT n P 30 Ibs 13 6kg 10 Timber Lane Marlboro NJ 07746 Tel 732 683 2356 Fax 732 683 9790 www adcom com Printed inthe USA GFA54 98 v 1 2
3. Power Amplifier OWNER S MANUAL gt THE FOLLOWING PRECAUTIONS AND SAFETY INSTRUCTIONS ARE REQUIREMENTS OF UL AND CSA SAFETY REGULATIONS Warning To reduce the risk of fire or electric shock do not expose this unit to rain or moisture CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN AVIS RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR The graphic symbol of a lightning flash with an arrow point within a triangle signifies that there is dangerous voltage within the unit and it poses a hazard to anyone removing the cover to gain access to the interior of the unit Only qualified service personnel should make any such attempt The graphic symbol of an exclamation point within an equilateral triangle warns a user of the device that it is necessary to refer to the instruction manual and its warnings for proper operation of the unit Do not place this unit on an unstable cart stand tripod bracket or table The unit may fall causing serious injury to a child or adult and serious damage to the unit Use only with a cart stand tripod bracket or table recommended by the manufacturer or sold with the unit Any mounting of the device should follow the man ufacturer s instructions and should use a mounting ac cessory recommended by the manufacturer A A O Read all the safety and operating instructions before connecting or using this unit Retain this notice and the owner s manual for future reference All warnings on th
4. During normal home operation the internal heatsinks of the GFA 5400 may become warm However there are instances during high level playback into low impedance when the heatsinks will become much warmer than usual To ensure the amplifier s long term trouble free operation it is necessary to provide adequate ventilation for the heatsinks Therefore the GFA 5400 should be kept away from external sources of heat such as radiators and hot air ducts The GFA 5400 should never be placed with other heat producing components in a cabinet or enclosure lacking free airflow If you require that the GFA 5400 be mounted in an enclosed cabinet it is recommended that the rear panel of the cabinet be provided with ventilation openings at the top and bottom to allow air to circulate freely in the cabinet The top and bottom panels of the amplifier s chassis have been provided with vents to allow the necessary cooling of the internal components It is imperative that these vents are not obstructed in any way We recommend that you do not stack other components on top of the GFA 5400 This is particularly important if your system includes low impedance loudspeakers that are difficult to drive or if you will consistently demand high volume levels from the amplifier and speaker system Heat generated by the amplifier will not only affect the performance of equipment stacked on top of the GFA 5400 but the free flow of air through the ventilating slots in the amplifier may be p
5. amplifier noise when used with a source component of low output impedance such as an ADCOM preamplifier or tuner preamplifier To preserve the correct stereo image please be certain to connect the left output of the preamplifier or tuner preamplifier to the RCA jack on the GFA 5400 labeled LEFT INPUT and the right output of the source component to the RIGHT INPUT jack RIGHT LEFT OUTPUT The GFA 5400 is polarity correct and does not invert phase That is any positive going signal at its input will appear WARNING Whenever connections to or from the GFA 5400 are being made be certain that the AC on off switch of the amplifier is in the off position the AC cord of the amplifier is disconnected from the AC wall outlet and that all associated components are turned off as a positive going signal at its output The GFA 5400 s connections to the loudspeakers are made through two high quality five way gold plated binding posts located on the rear panel These terminals will accommodate bare wire tinned wire terminal pins spade lugs or banana plugs both single and dual These output terminals are color coded RED and BLACK to indicate polarity To ensure correct stereo phasing you must connect the RED output terminal labeled to the loudspeaker input terminal color coded RED or labeled POSITIVE POS 8 OHMS or 4 OHMS The BLACK binding post terminal on the amplifier labeled should be connected to the loudspeaker inp
6. tightened in a clockwise direction Additionally when connecting the cables to the amplifier and loudspeakers it is important that you tin the wires with good quality electronic solder in order to minimize contact resistance Tinning prevents the buildup of surface compounds which can form on copper wire and increase its contact resistance If you prefer to use other methods of connection unscrew the insulated head of the binding post until the hole in the binding post stud is accessible You can then insert the bare or tinned wire or terminal pin through the hole You can also use the many variety of spade lugs available by simply placing the tines of the spade lug onto the binding post stud Turn the insulated head of the binding post clockwise until the wire or connector is firmly secured Finger pressure is sufficient and you should not use pliers or other tools which could damage or over tighten the binding post assembly The binding post has been designed in such a way that finger pressure is all that is required to cause a pinching action among the different metal surfaces to ensure proper connection All loudspeakers having nominal impedance down to 4 ohms can be connected to and driven by the GFA 5400 The amplifier can drive these low impedance at more than adequate power levels with no difficulty It should be noted here that many loudspeaker systems which are nominally rated at 4 ohms in actuality drop in impedance in some areas
7. 7 X expose this equipment to rain or moistur _ 9 GFA 5400 Rear Panel Diagram Generally speaking when making connections to the loudspeakers from the amplifier it is very important to use the correct type and size of wire in order to avoid unnecessary loss of amplifier power in the cable reduction of amplifier damping factor and other undesirable conditions For runs up to twelve feet ordinary zip or lamp cord made up of AWG18 stranded wire and available in a variety of insulation colors may be used For runs up to forty feet AWG16 stranded wire should be used as a minimum to prevent power losses For lengths over forty feet and not exceeding sixty feet use at least AWG14 stranded wire Runs exceeding sixty feet require the use of heavier conductors such as AWG12 There are several different ways to connect the wiring to the RIGHT and LEFT OUTPUTS The methods used will depend on the specific type of connectors supplied with the loudspeakers the speaker cables etc As a matter of course we prefer the use of banana plugs generally it is the most secure method of connection Also the springs of the banana plugs create a self cleaning action which ensures the best contact between the binding posts and the connectors themselves There are sockets provided in the center of the binding posts studs which permit secure seating of the banana plugs Before inserting the banana plug into the binding post ensure the binding post is securely hand
8. LEDs will light when distortion reaches 1 regardless of impedance voltage current phase angle or the reactance of the loudspeakers which the amplifier is driving Sometimes when the amplifier is in use the LEDs may occasionally flicker during high volume listening particularly if you are driving low impedance loads This flickering is no cause for concern The LEDs are simply warning you that the amplifier is approaching its maximum power output into the particular loudspeakers you are using If however the INSTANTANEOUS DISTORTION ALERT LEDs glow brightly or are illuminated most of the time during playback you are overdriving the amplifier and should turn down your volume control to reduce the listening level If not excessive level may cause the THERMAL PROTECTION to be activated or in extreme cases damage your loudspeakers THERMAL PROTECTION LEDs The GFA 5400 is provided with a thermal protection circuit which will shut down the amplifier if either heatsink s temperature reaches 85 C The THERMAL PROTECTION LEDs will light whenever the thermal protection circuit on its respective channel has been triggered and the amplifier is inoperative The thermal protection circuitry will typically be triggered by very high power demands into impedance much lower than the amplifier is capable of driving at those levels If either amplifier channel s output through the loudspeaker s ceases abruptly and one or both of the THERMAL PROTECTION LEDs glow
9. ained from our Service Department for a nominal charge Always ship PREPAID VIA UNITED PARCEL SERVICE UPS OR OTHER APPROVED CARRIER DO NOT SHIP VIA PARCEL POST since the packing was not designed to withstand rough Parcel Post handling FREIGHT COLLECT SHIPMENTS WILL NOT BE ACCEPTED UNDER ANY CIRCUMSTANCES GFA 5400 SPECIFICATIONS Power Rating To FTC Requirements 125 watts continuous average power into 8 ohms 20Hz and 20kHz with both channels driven at less than 0 18 THD 200 watts continuous average power into 4 ohms 20Hz and 20kHz with both channels driven at less than 0 18 THD IM Distortion SMPTE Twat to 125 watts into 8 Ohms a a lt 0 05 1 watt to 200 watts into 4 ohms lt 0 05 IM Distortion CCIF Any Combination from 4kHz to 20kHz NZD Walls I7ll0 8 ORMS EHE lt 0 035 200 Watts ITO DDITIS iios s oa do oreet notes is vt o as dee oh pee eee Re AU en rU MD UE leere lt 0 035 THD Noise at 125 watts into 8 ohms Typical MOA dc 0 018 REIZ CEPR 0 0296 NORD ct M M TE TNR MN E 0 07 OMA see ih O 0 14 THD Noise at 200 watts into 4 ohms Typical OO MM DERE acetal ee re 0 01896 had ciaci n 0 02 ul Cmn 0 0896 7 0 iy p C Tcu 0 16596 Frequency Response 1 Watt into 8 ohms 10Hz to 20kHz ssssseseRRR eem ees 0 0 25dB Power Bandwidth SOB mec r 3Hz to 130kHz Dynamic Headroom into 4 ohms
10. artially obstructed If you observe these recommendations the GFA 5400 will perform reliably in any reasonable environment You should also pay attention to such normal considerations as protection from excessive dust and moisture Occasional vacuuming of accumulated dust on the chassis heatsinks panels and around the ventilating slots should be all that is required The optimal performance of your new GFA 5400 will ultimately depend on the care with which you make the connections between the amplifier preamplifier and the loudspeakers All input and output signal connections should be made only with high quality low loss low capacitance cables following the recommendations in the following relevant sections RIGHT LEFT INPUT The audio inputs to the GFA 5400 are through two high quality gold plated RCA jacks to minimize high frequency losses noise Etc They will accept standard RCA type plugs one for each channel LEFT and RIGHT To ensure that the performance designed into the GFA 5400 is realized you should use the highest quality cables feasible Whatever cable you finally select it should have low capacitance This is particularly important if you use a long run between the preamplifier and amplifier Generally speaking a cable with a capacitance of less than 100 pF will work best The load impedance which the GFA 5400 inputs present to the source preamplifier or tuner preamplifier is 49 9k ohms This load impedance results in minimal
11. chnical Service Department to answer questions pertinent to the installation and operation of your unit In the event of difficulty please contact us for prompt advice If your problem cannot be resolved through our combined efforts we may refer you to an authorized repair agency or authorize return of the unit to our factory To aid us in directing you to a convenient service center it would be helpful if you indicate which major city is accessible to your home Please address mail inquires to Phone Fax or E mail inquires to ADCOM Service Corporation Tel 732 683 2356 10 Timber Lane Fax 732 683 9790 Marlboro NJ 07746 USA Monday through Friday 9 00 AM to 5 00 PM EST service adcom com For Fax inquires please include a return Fax number for the reply When calling or writing about your GFA 5400 be sure tu note and refer to its serial number as well as the date of purchase and the dealer from whom it was purchased It is helpful in any communications to us Please include a daytime phone number where we may reach you In the event the unit must be returned to our factory for service you will be instructed on the proper procedure when you call or write for a Return Authorization UNDER NO CIRCUMSTANCES SHOULD YOUR UNIT BE SHIPPED TO OUR FACTORY WITHOUT PRIOR AUTHORIZATION OR PACKED IN OTHER THAN ITS ORIGINAL CARTON AND FILLERS If the original shipping carton and its fillers have been lost discarded or damaged a duplicate carton may be obt
12. ction offered by the Warranty its reasonable limitations and what you should do in order to obtain its benefits Be sure to verify that the serial number printed on the rear panel matches the serial number on the outer carton If any number is altered or missing you should notify us immediately in order to ensure that you have received a genuine ADCOM product which has not been opened mishandled or tampered with in any way UNPACKING Before your new GFA 5400 left our factory it was carefully inspected for physical imperfections and tested for all electrical parameters as a routine part of ADCOM s systematic quality control This along with full operational and mechanical testing should ensure a product flawless in both appearance and performance After you have unpacked the GFA 5400 inspect it for physical damage Save the shipping carton and all packing material as they are intended to reduce the possibility of transportation damage should the amplifier ever need to be shipped again In the unlikely event damage has occurred notify your dealer immediately and request the name of the carrier so a written claim to cover shipping damages can be initiated THE RIGHT TO A CLAIM AGAINST A PUBLIC CARRIER CAN BE FORFEITED IF THE CARRIER IS NOT NOTIFIED PROMPTLY N WRITING AND IF THE SHIPPING CARTON AND PACKING MATERIALS ARE NOT AVAILABLE FOR INSPECTION BY THE CARRIER SAVE ALL PACKING MATERIALS UNTIL THE CLAIM HAS BEEN SETTLED INSTALLING THE GFA 5400
13. d or the plug has been damaged or Objects have fallen or liquid has been spilled into the unit or The unit has been exposed to rain or liquids of any kind or The unit does not appear to operate normally or exhibits a marked change in performance or The device has been dropped or the enclosure damaged oom m DO NOT ATTEMPT SERVICING OF THIS UNIT YOURSELF REFER SERVICING TO QUALIFIED SERVICE PERSONNEL ATTENTION POUR PR VENIR LES CHOCS LECTRIQUES NE PAS UTILISER CETTE FICHE POLARIS E AVEC UN PROLONGATEUR UNE PRISE DE COURANT OU UNE AUTRE SORTIE DE COURANT SAUF SI LES LAMES PEUVENT ETRE INSEREES A FOND SANS EN LAISSER AU CUNE PARTIE A DECOUVERT CAUTION TO PREVENT ELECTRIC SHOCK DO NOT USE THIS POLARIZED PLUG WITH AN EXTENSION CORD RECEPTACLE OR OTHER OUTLET UN LESS THE BLADES CAN BE FULLY INSERTED TO PREVENT BLADE EXPOSURE CAUTION POWER LINES Any outdoor antenna must be located away from all power lines OUTDOOR ANTENNA GROUNDING If an outside antenna is connected to your tuner or tuner preamplifier be sure the antenna system is grounded so as to provide some protection against voltage surges and built up static charges Section 810 of the National Electrical Code ANSI NFPA No 70 1984 provides information with respect to proper grounding of the mast and supporting structure grounding of the lead in wire to an antenna discharge unit size of grounding conductors location of antenna discharge
14. e unit and in its operating instructions should be adhered to All operating and use instructions should be followed Do not use this unit near water for example near a bathtub washbowl kitchen sink laundry tub in a wet basement or near a swimming pool The unit should be installed so that its location or position does not interfere with its proper ventilation For example it should not be situated on a bed sofa rug or similar surface that may block the ventilation openings or placed in a built in installation such as bookcase or cabinet that may impede the flow of air through its ventilation openings The unit should be situated away from heat sources such as radiators heat registers stoves or other devices including amplifiers that produce heat The unit should be connected to a power supply outlet only of the voltage and frequency marked on its rear panel The power supply cord should be routed so that it is not likely to be walked on or pinched especially near the plug convenience receptacles or where the cord exits from the unit Clean unit only as recommended in its instruction manual The power supply cord of the unit should be unplugged from the wall outlet when it is to be unused for a long period of time Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through any openings This unit should be serviced by qualified service personnel when The power cor
15. g fed to the amplifier but it does not signify that the entire amplifier s circuits are in operation If for example the THERMAL PROTECTION LED glows the amplifier will not produce sound even though the POWER LED may still glow Additionally the internal power transformer is provided with a thermostat which will interrupt power into the transformer if its temperature exceeds 125 C This high temperature will seldom if ever be encountered unless the amplifier is subjected to abnormal conditions such as operation into loads of less than 3 ohms at very high listening levels etc If the AC POWER FUSE is not blown the POWER LED is out and the THERMAL PROTECTION LED is lit this would indicate that the thermostat within the transformer has opened Once the temperature within the transformer decreases to a normal level the thermostat will reset itself automatically and normal operation will resume If you are to avoid continually tripping the thermostat in the transformer you must reduce the sound level demands correct the load impedance of the loudspeakers or both a 5400 Front Panel Diagram INSTANTANEOUS DISTORTION ALERT LEDs The INSTANTANEOUS DISTORTION ALERT circuit is a unique ADCOM distortion detection system which reads all forms of non linear distortion such as THD IM slew induced clipping etc The INSTANTANEOUS DISTORTION ALERT
16. icular specifies that the cable ground shall be connected to the grounding system of the building as close to the point of cable entry as practical Congratulations on your decision to purchase the GFA 5400 Stereo Power Amplifier You have made a wise choice that will reward you with exceptionally accurate and musical sound reproduction for years to come To realize the full potential of your new amplifier please read these operating and installation instructions thoroughly before attempting to connect it FEATURES e Precision matched MOSFETs used throughout the signal path e Over 50 000 uF of power supply filter capacitance with low ESR for greater reserve capacity e Low number of gain stages improves signal reproduction accuracy e Custom toroidal power transformer provides better regulation and greater peak current capability e High quality gold plated binding posts e Independent thermal overload and distortion LEDs for each channel e Gold plated RCA jacks e Large internal heatsinks for greater cooling capability of output devices e Heavy gauge anodized aluminum front panel e Powder coated baked chassis and top cover for greater durability e Cooling vents on top cover for greater efficiency and cooler operation while driving low impedance loads ADCOM PROTECTION PLAN USA ONLY ADCOM offers the enclosed valuable Limited Warranty Please read the details on the Warranty Card carefully to understand the extent of the prote
17. of their frequency range to below 2 ohms You should not experience difficulties even with these very low impedance loads unless you demand excessively high volume levels from the system In most applications you can drive two or more sets of loudspeakers You should note however that when loudspeakers are run in parallel the impedance presented to the amplifier is lower than the nominal impedance of each loudspeaker In other words if you parallel two 8 ohm sets of loudspeakers the resultant impedance presented to the amplifier will be 4 ohms f 8 ohm and 4 ohm loudspeakers are paralleled the resultant impedance will be approximately 2 6 ohms In this last situation depending upon the lowest impedance of the nominally 4 ohm speakers and if excessive power demands are placed on the amplifier you may trigger the THERMAL PROTECTION on the amplifier See its respective section for more information For convenient switching of multiple sets of speakers with impedance protection for the amplifier you should consider the use of an ADCOM speaker selector These are available from your local ADCOM dealer AC LINE CORD O The AC cord provides power to operate all the GFA 5400 s circuits Its plug can be connected to a standard wall outlet provided the outlet supplies a voltage compatible with the Power requirements printed on the rear of the GFA 5400 The GFA 5400 s power cord is supplied with a polarized AC plug as required by UL CSA standards and
18. the National Electrical Code To minimize the risk of electrical shock and to ensure minimal hum from the system do not defeat the polarity ensuring feature of the plug one wide blade and one narrow blade To prevent electrical shock do not use this polarized plug with an extension cord or other outlet unless the blades can be fully inserted to prevent blade exposure AC POWER FUSE The AC POWER FUSE protects the electronic circuits of the GFA 5400 This fuse will normally blow only if there is an overload within the GFA 5400 For continued protection of the electronic circuit the fuse should only be replaced with a fuse of the same type and value as printed on the rear panel of the amplifier If turning on the amplifier does not cause the POWER LED to glow this may indicate that the AC POWER FUSE ts blown Unplug the AC LINE CORD from the AC wall outlet and turn the AC ON OFF SWITCH off and check the fuse If the fuse is blown replace it only with one of the same type and value as printed on the rear panel of the amplifier If after replacing the fuse it blows immediately upon turning on the amplifier POWER LED does not glow a failed electronic component or other internal problem must be suspected Make no further attempts at fuse replacement or operation of the amplifier Refer the problem to competent ADCOM authorized service personnel To remove a blown or suspect fuse from its holder use only a 2 Phillips screwdriver to prevent damage
19. to the fuse holder Simply press lightly on the fuse holder cap and turn counterclockwise The cap will pop out after a quarter turn Once a new fuse has been installed in the fuse holder cap insert it into the fuse holder body and press lightly while turning the cap clockwise until it is firmly seated Be certain not to cause Cross threading of the fuse holder body and cap to prevent damage to the fuse holder DO NOT FORCE THE FUSE HOLDER CAP INTO THE THREADS WARNING Before attempting to check or replace a blown fuse be certain to unplug the AC line cord from the AC wal outlet to prevent possible electrical shock Replace the AC POWER FUSE only with one identical in type and rating as printed on the rear panel DO NOT USE ANY SUBSTITUTE FUSES WITH DIFFERENT RATINGS OR VALUES Failure to observe this precaution may cause serious damage to the amplifier circuits MAY CREATE A FIRE HAZARD AND MAY VOID THE WARRANTY AC POWER FUSE For 115 Volt operation 8 AMP AGC 250V AC POWER FUSE For 230 Volt operation 4 AMP AGC 250VAC ON OFF SWITCH O The AC ON OFF SWITCH controls power to the power transformer circuits of the GFA 5400 Whenever the GFA 5400 is energized the POWER LED will glow Depress the push button switch to energize the GFA 5400 Press the switch again to turn the amplifier off POWER LED O This LED will glow whenever the AC ON OFF switch is turned on and the GFA 5400 is energized The POWER LED indicates that there is AC voltage bein
20. unit connection to grounding electrodes and requirements for the grounding electrode a Use No 10 AWG 5 3 mm copper No 8 AWG 8 4 mm aluminum No 17 AWG 1 0 mm copper clad steel or bronze wire or larger as a ground wire b Secure antenna lead in and ground wires to house with stand off insulators spaced from 4 6 feet 1 22 1 83 m apart c Mount antenna discharge unit as close as possible to where lead in enters house d Use jumper wire not smaller than No 6 AWG 13 3 mm copper or the equivalent when a separate antenna grounding electrode is used See NEC Section 810 21 j EXAMPLE OF ANTENNA GROUNDING AS PER NATIONAL ELECTRICAL CODE INSTRUCTIONS CONTAINED IN ARTICLE 810 RADIO AND TELEVISION EQUIPMENT POWER LINES N GROUND CLAMP N SERVICE ENTRANCE NDUCTOR STANDOFF ZUM INSULATORS b MAST v SERVICE ANTENNA ENTRANCE LEAD IN WIRE EQUIPMENT ANTENNA DISCHARGE UNIT c TO EXTERNAL ANTENNA TERMINALS OF RADIO RECEIVER POWER SERVICE GROUNDING ELECTRODE SYSTEM 6 g interior metal water pipe GROUND WIRE a b GROUND CLAMPS BONDING JUMPER d OPTIONAL ANTENNA GROUNDING ELECTRODE DRIVEN B FEET 2 44 M INTO THE EARTH IF REQUIRED BY LOCAL CODES SEE NEC SECTION 810 21 NOTE TO CATV SYSTEM INSTALLER This reminder is provided to call the CATV system installers attention to Article 820 22 of the National Electrical Code that provides guidelines for proper grounding and in part
21. ut terminal color coded BLACK or labeled NEGATIVE NEG C COMMON G or GROUND The RIGHT OUTPUT should be connected to the right channel loudspeaker as you face the pair of loudspeakers and the LEFT OUTPUT to the left channel loudspeaker In order to ensure that connections to the loudspeakers are correct you must be able to identify each wire conductor of the loudspeaker cables at both ends of the cables This is relatively easy to do since most loudspeaker cables consist of two parallel stranded conductors in a flexible insulation with a coding system for wire identification Sometimes there is a colored racer wrapped around one of the conductors some cables have one of the conductors colored silver and the other copper some have a ridge molded on the insulation of one of the conductors while others are imprinted with and or markings o o o o ose ines DUE Stereo output I ing any right fart AC line fuse AGC 8A LEN feft input AE E l amp ADCOM ER 10 Timber Lane LS Marlboro NJ 07746 USA xv Model GFA 5400 Power 115VAC CAUTION Ta pravant alactric a anno do not remove cover Frequency 50 60Hz ADCOM Marque Deposee A used serviceable parts inside Refer servicing to qualified PE tinued h Power Consumpton max 960W oos Aa A S E Lu x n supply cord befor changing fuse Risk of Bleche shock i t WARNING Ta reduce the risk of fire or electr shock do nor AL _ DO NOT OPEN
22. you will know that its heatsink temperature has become unacceptably high and the circuitry is protecting the amplification devices Please note that the POWER LED will remain on and the amplifier will still be energized Once the temperature of the heatsink s drops to a safe operating level the amplifier will automatically resume operation Activation of the thermal protection circuitry in the GFA 5400 is an indication that the amplifier has been overdriven or that the load the loudspeakers are presenting to the amplifier is unreasonably low If you wish to prevent recurring activation of the thermal protection circuitry you must reduce the volume level demands or correct the load impedance condition which may be causing activation of this circuitry or both internal protection fuses may blow CARING FOR YOUR GFA 5400 Great care has been taken by ADCOM to ensure that your amplifier is as flawless in appearance as it is electronically The front panel is a heavy gauge high grade aluminum extrusion carefully finished and anodized for durability The chassis top cover and rear panels are heavy gauge steel that has been powder coated and baked to ensure a lasting finish If the front panel top or sides become dusty or finger printed they can be cleaned with a soft lint free cloth slightly dampened with a very mild detergent solution or glass cleaner WARNING Do not spray or pour liquids of any kind on the GFA 5400 SERVICING ADCOM has a Te
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