DESCRIPTION OF UNIT: REAR PANEL
(1) Inputs (unbalanced)
The audio inputs for the GFA-555se 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 channel; Left and Right. To insure that the performance designed into the amp is preserved, you should use the highest quality audio cables possible. There are many cables which are color-coded and specifically designed for this application. Your ADCOM dealer can help select the best cable for your needs. (See CONNECTING THE GFA-555se for more information).
(2) Inputs (balanced)
The audio inputs for the GFA-555se are through high-quality, Balanced XLR jacks to minimize high-frequency losses, noise, etc. They will accept standard XLR-type plugs, one for each channel; Left and Right. To insure that the performance designed into the amp is preserved, you should use the highest quality audio cables possible. There are many cables specifically designed for this application. Your ADCOM dealer can help select the best cable for your needs. (See CONNECTING THE GFA-555se for more information).
(3) Outputs
The GFA-555se 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 AWG1O) and “banana” type plugs (single or dual). (Refer to your User Manual for your speakers for additional information).
(4) AC Fuse
The AC Fuse protects the electronic circuits of the GFA- 555se. This fuse, normally, will fail only if there is an overload within the GFA-555se. It may, however, fail if the amplifier attempts to deliver very high power into very
low-impedance loudspeakers. In either case, BE SURE TO REPLACE THE AC Fuse ONLY WITH AN EXACT REPLACEMENT FUSE. The proper fuse values are:
GFA-555se for 115 volt operation | |
Fuse Rating | BUSS® | Littelfuse® |
12 Amp 250 Volt ... AGC-12/250V .... (3AB) 314012/250V |
GFA-555se for 230 volt operation | |
Fuse Rating | BUSS® | Littelfuse® |
6 Amp 250 Volt .... | AGC-6/250V ..... (3AG) 314006/250V |
Before attempting to replace a failed fuse, be certain to unplug the AC Power Cord from the AC wall outlet to prevent possible electrical shock. Replace the AC 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 hazard fire, and may void the warranty. If the Power LED (8) does not glow, it may be an indication that the AC fuse has blown. If you are not sure, or the amplifier displays other symptoms, please consult the RESOLVING PROBLEMS section on page 12.
Fuse replacement
To remove the fuse-holder cap, you will need a #2 standard Phillips screwdriver. Place the screwdriver in the recessed “crosshead” in the cap. Turn the cap counter-clockwise, until the cap releases out towards you. Grasp the cap with your fingers and pull it completely out. The fuse is inserted in the back of the cap; gently pull it free.
Since the fuse has a ceramic body, you cannot visually examine the fuse element, it is therefore suggested that you replace it with an identical substitute or bring the fuse to your ADCOM dealer so they may check its integrity. To replace the fuse, insert it in the back of the fuse-holder cap. Place the cap into the fuse-holder. Place the screwdriver in the recessed slot, gently press in and turn 1/8-turn clockwise.
(5) AC Power Cord
The AC cord provides power to operate all the GFA-555se’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 panel of the GFA-555se.
