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To insure that the performance designed into the GFA-7705/07 is preserved, you should use the highest quality, shielded audio cables possible. There are many cables which are color-coded and specifi cally designed for this application. Your Adcom dealer can help select the best cable for your needs. (See Connecting the GFA-7705/07 for more information.) Inputs (1b) Chassis knock-out for future expansion channel-card input jack (GFA-7705 only). Outputs (2) The GFA-7705/07’s connections to the loudspeakers are made through high-grade, 5-way, gold-plated binding post terminals. There are two terminals for each speaker, which are colored RED for the positive (+) output and BLACK for the negative (-) output. The binding posts will accept a variety of connector types; the most secure and prevalent of these is the “U”-type spade connectors (at least 0.25” wide and maximum width of 0.57”). The terminal will also accept bare wire (up to AWG10) and “banana” type plugs (single or dual). (See CONNECTING THE GFA-7705/07 for more information.) Outputs (2b) Chassis knock-out for future expansion channel-card output binding posts (GFA-7705 only). 5 (2) (1) (2b) (3a) (3b) (4) (1b) WARNING THERE ARE NO USER-SERVICEABLE PARTS OR FUSES INSIDE THE GFA-7705/07. In the event that the amplifier’s rear-panel circuit breaker fails to reset (opens again when power applied to unit and unit turned on) you must refer the amplifier to ADCOM Factory Service or ADCOM Authorized Service Center.turned on) you must refer the amplifier to ADCOM Factory Service or ADCOM Authorized Service Center. Do not open the amplifier nor remove the topcover—Hazardous and Potentially Lethal Voltage Present and Warranty may be voided. WARNING THERE ARE NO USER-SERVICEABLE PARTS OR FUSES INSIDE THE GFA-7705/07. In the event that the amplifier’s rear-panel circuit breaker fails to reset (opens again when power applied to unit and unit turned on) you must refer the amplifier to ADCOM Factory Service or ADCOM Authorized Service Center.turned on) you must refer the amplifier to ADCOM Factory Service or ADCOM Authorized Service Center. Do not open the amplifier nor remove the topcover—Hazardous and Potentially Lethal Voltage Present and Warranty may be voided. 12VDC Triggering (3a) ADCOM has provided the installer the ability to control the OFF/ON function of the GFA-7705/07 by a 12Volt DC output jack on the rear of certain pre-amplifiers and tuner pre-amplifiers. When using this feature the front panel Power Switch must be left in the in “on” position. To connect, you will need a monaural mini phone plug to monaural mini phone plug cable of appropriate length (not included) to reach from the rear panel of the amplifier to the rear panel of the pre-amplifier. Contact your dealer for information on using this feature with ADCOM and other brand pre-amplifiers. Although 12VDC is optimal, the circuit will operate from approx. 5 to 30VDC. Center conductor (tip) is positive (+). AC Circuit Breaker (3b) The 15-Amp AC Breaker protects the electronic circuits of the GFA-7705/07. Normally, this breaker will open only if there is an overload or a component failure within the GFA-7705/07. If the Power LED (7) does not glow, it may be an indication that the AC Breaker has blown. If you are using the 12VDC Triggering feature (above) it may be possible that there is no trigger voltage present or a problem exists with that connection. To determine if the problem is caused by a malfunction in the 12VDC system, remove the small plug inserted into the 12VDC Triggering jack. Press the front panel power switch to turn off the amp, and immediately re-press the power switch. If the problem is caused by the 12VDC triggering circuit the amp will turn on and the LED will glow. DO NOT attempt repair of the 12VDC system. If you are not sure, or the amplifier displays other symptoms, please consult the RESOLVING PROBLEMS section on page 13. AC Power Cord (4) The AC cord provides power to operate all the GFA-7705/07’s circuits. The GFA-7705/07 is a very high power amplifier and as such must be directly connected to the wall outlet or an appropriate (noncurrent limiting) surge protector or AC line conditioner of 20-Amp service capability. NOTE: As previously described on Page 4, the attached plug is a 20-Amp fitting which, in order for the amplifier to deliver its rated power output, should not be defeated in order to accomodate standard 15-amp household wall outlets. Please consult with your dealer and/or licensed electrician for conversion of a 15 amp outlet and panel circuit to a 20 amp circuit. 6 (5) (6) (7) (8a, 8b) Front Panel On/Off Switch (5) The On/Off Switch controls power to the power transformer and circuits of the GFA-7705/07. Whenever the GFA-7705/07 is energized the Power LED (7) will glow. To turn the GFA-7705/07 on, press the push-button. It will remain in the “engaged” position while the unit is energized. To turn the GFA-7705/07 off, press the push-button in and release and i...
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