AdcomメーカーGFA-7700の使用説明書/サービス説明書
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GF A-7700 High Current 5-Channel Power Amplier Owner’ s Manual.
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• Precision-matched dev ices used throughout the signal path. • 120,000 µF of power supply-lter capacitance for greater reserve capacity . • Independent power supplies for each channel. • F ewer gain stages improve signal reproduction accur acy .
Introduction Congratulations on your decision to purchase the GF A-7700, 5-channel power amplier . The GF A-7700 integrates very well with any other home theater system, such as Dolby P roLogic ™ or Dolby Digital ™ .
Description of Unit Rear P anel Inputs (1) The audio inputs for the GF A-7700 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 12VDC T riggering (4a) The GF A-7700 is a very high power amplier and as such must be directly connected to the wall outlet or an appropriate surge protector or AC line conditioner . It must never be connected to the “switched” outlets on the rear panel of a pre-amplier .
Front P anel On/Off Switch (6) The On/Off Switch controls power to the power transformer and circuits of the GF A-7700. Whenever the GF A-7700 is energized the P ower LED (7) will glow . T o turn the GF A-7700 on, press the push-button. It will remain in the “engaged” position while the unit is energized.
8 Distortion Alert LEDs (8) The Dis tort ion Alert cir cuit is a un ique ADCO M di stor tion dete ctio n sy stem whic h re ads all form s of non- lin ear dist orti on su ch a s THD, IM, slew -ind uced , “c lippi ng,” etc .
9 Installation & Hookup Unpacking the GF A-7700 Before your new GF A-7700 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.
10 Connecting the GF A-7700 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 bracketed sets, one 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 difculty , 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 Specications THD + Noise into 8 ohms (T ypical) 20Hz ............................................................................................................... 0.006% 1kHz .............................................................
8551 East Anderson Drive, Suite 105 Scottsdale, Arizona 85255 V oice: (480) 607-2277 Fax: (480) 348-9876 www .adcom.com gfa7700_manual_v1.
デバイスAdcom GFA-7700の購入後に(又は購入する前であっても)重要なポイントは、説明書をよく読むことです。その単純な理由はいくつかあります:
Adcom GFA-7700をまだ購入していないなら、この製品の基本情報を理解する良い機会です。まずは上にある説明書の最初のページをご覧ください。そこにはAdcom GFA-7700の技術情報の概要が記載されているはずです。デバイスがあなたのニーズを満たすかどうかは、ここで確認しましょう。Adcom GFA-7700の取扱説明書の次のページをよく読むことにより、製品の全機能やその取り扱いに関する情報を知ることができます。Adcom GFA-7700で得られた情報は、きっとあなたの購入の決断を手助けしてくれることでしょう。
Adcom GFA-7700を既にお持ちだが、まだ読んでいない場合は、上記の理由によりそれを行うべきです。そうすることにより機能を適切に使用しているか、又はAdcom GFA-7700の不適切な取り扱いによりその寿命を短くする危険を犯していないかどうかを知ることができます。
ですが、ユーザガイドが果たす重要な役割の一つは、Adcom GFA-7700に関する問題の解決を支援することです。そこにはほとんどの場合、トラブルシューティング、すなわちAdcom GFA-7700デバイスで最もよく起こりうる故障・不良とそれらの対処法についてのアドバイスを見つけることができるはずです。たとえ問題を解決できなかった場合でも、説明書にはカスタマー・サービスセンター又は最寄りのサービスセンターへの問い合わせ先等、次の対処法についての指示があるはずです。