Instruction/ maintenance manual of the product GFA7707 Adcom
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GF A-7705 & GF A-7707 S.A.F .E. ® HIGH CURRENT , MUL TI-CHANNEL POWER AMPLIFIERS.
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• Precision-matched dev ices used throughout the signal path. • Independent power supplies for each channel. • F ewer gain stages improve signal reproduction accur acy . • Custom toroidal power tr ansformer prov ides better regulation and greater peak current capability .
Introduction Congratulations on your decision to purchase the GF A-7705/07 multi-channel power ampli er . The GF A-7705/ 07 integrates very well with any other home theater system, such as Dolby P roLogic ™ or Dolby Digital ™ or Dolby Digital ™ ™ .
Rear P anel Inputs (1) The audio inputs for the GF A-7705 and 7707 are through high-quality , gold-plated RCA jacks to minimize high- frequency losses, noise, etc. They will accept standard RCA-type plugs, one for each of the ve channels; Front L (Left), Center , Front R (Right), Surround L (Left), and Surround R (Right).
6 W ARNING THERE ARE NO USER-SER VICEABLE P AR TS OR FUSES INSIDE THE GF A-7705/07. In the event that the ampli er ’ s rear-panel circuit breaker fails to reset (opens again when power applied to unit and unit turned on) you must refer the ampli er to ADCOM Factory Service or ADCOM Authorized Service Center .
Front P anel On/Off Switch (5) The On/Off Switch controls power to the power transformer and circuits of the GF A-7705/07. Whenever the GF A-7705/07 is energized the P ower LED (7) will glow . T o turn the GF A-7705/07 on, press the push-button. It will remain in the “engaged” position while the unit is energized.
8 Distortion Alert LEDs (7) The Dis tort ion Alert cir cuit is a uni que ADCOM dis tort ion d etec tion syst em w hich read s al l fo rms o f no n- lin ear dist ortio n su ch a s T HD, IM, s lew- indu ced, “cli ppin g,” e tc.
9 W ARNING Whenever connections to or from the GF A-7705/07 are being made, be certain that the AC On/Off Switch (5) of the ampli er is in the OFF position, the AC P ower Cord (4) of the ampli er is disconnected from the AC wall outlet and that all associated components are turned off.
10 Connecting the GF A-7705/07 R emember , that the Left and Right designations are as you are sitting down in your listening/viewing area. On the rear panel, the inputs and outputs are grouped in 5 or 7 bracketed sets, one set for each channel.
11 Inputs (1) T o preserve the correct effects, be certain to connect the RCA cables to the proper RCA-input connector . If the cables are color coded, then use this sequence for the connections: Blue ..................................................
It is suggested that the three front channels follow this chart for speaker lengths and wire gauges. up to 24 feet ...................................... A WG16 up to 36 feet ...................................... A WG14 up to 58 feet ................
T roubleshooting Resolv ing Problems Use the chart below to solve common situations that don’t require professional attention. If the steps stated in POSSIBLE SOLUTION do not resolve your problem, then please contact your ADCOM Dealer or call the ADCOM Customer Service Department.
Serv icing ADCOM has a T echnical Service Department to answer questions pertinent to the installation and operation of your unit. In the event of dif culty , please contact us for prompt advice. Please have the following information readily at hand: the unit’ s model and serial numbers, and dealer from whom it was purchased.
GF A-7700/7707 Speci cations P ower Rating (T o EIA/CEA-490-A Requirements 200 W atts continuous average power per channel into 8 ohms at any frequency between 20Hz and 20kHz with all channels driven at less than 1% THD.
8541 East Anderson Drive Scottsdale, Arizona 85255 V oice: (480) 607-2277 Fax: (480) 348-9876 www .adcom.com gfa7705/07_manual_v1.
An important point after buying a device Adcom GFA7707 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Adcom GFA7707 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 Adcom GFA7707 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Adcom GFA7707 you will learn all the available features of the product, as well as information on its operation. The information that you get Adcom GFA7707 will certainly help you make a decision on the purchase.
If you already are a holder of Adcom GFA7707, 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 Adcom GFA7707.
However, one of the most important roles played by the user manual is to help in solving problems with Adcom GFA7707. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Adcom GFA7707 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
