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Photos and specs  Adcom  GFA-6006

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 does not glow, it may be an indication that the AC fuse has blown. If you are using the 12V DC Triggering feature it may be possible that there is a problem with that connection. To determine if the problem is caused by a malfunction in the 12V DC system, remove the small plug inserted into the I2V DC 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 12V DC triggering circuit the amp will turn on and the LED will glow. DO NOT attempt repair of the 12V DC system. If you are not sure or the amplifie displays other symptoms, please consult the RESOLVING PROBLEMS section. Fuse Replacement Since the fuse has a ceramic body and you cannot visually examine the fuse element, it is suggested that you replace it with an identical substitute or bring the fuse to your ADCOM dealer so they may check its integrity. [11] AC Power Cord The AC cord provides power to operate all the GFA-6002/6006’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-6002/6006. ADCOM GFA-6006/02 Owner’s Manual | 11 SYMPTOM POSSIBLE REASON POSSIBLE SOLUTION Power LED does not glow. No sound AC Power Cord(s) not plugged in. AC Fuse(s) failed. Transformer thermal protection engaged. I2V DC triggering malfunctioning. Plug in AC Power Cord(s). Replace AC Fuse(s). Wait until unit cools down. It will reset. Reset power switch manually. Check connection of 12V DC trigger at source. Power LED glows, but no sound Preamp or source unit is not on. Connections in rear of amp are loose. Make sure whole system is on. Verify all connections on rear of amp. One channel not producing sound INPUT(s) or OUTPUT(s) connector disconnected or loose. Speaker disconnected. Internal protection engaged. Verify both connections on that channel. Verify connection at speaker. Bring to Dealer or Service Center. Hum from all speakers at any volume Ground loop (difference in ground voltages between components). If Cable TV is present (see Note 1). If Cable TV is not present (see Note 2). Hum from all speakers (hum goes up or down with volume) Problem with source unit (CD, tape, etc.), or RCA cable connecting that source unit to the preamp. Try different source (tuner, tape, etc.) and/or different RCA cable. Hum from the amplifier itself Some major appliance, dimmer, halogen or fluorescent light is creating interference. Make sure all appliances, dimmers and suspect lights are off. Troubleshooting Use the troubleshooting notes above 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. Any problems not covered here should be brought to the attention of your ADCOM dealer or ADCOM customer service department. A special note on “hum:” When there is a low-volume “hum” audible throughout your speakers, even with the main volume turned all the way down, you have a common phenomenon known as a “ground loop.” A ground loop is basically a difference in ground voltages between two or more components which are connected electrically and which creates multiple current paths where there must only be one. This difference in potentials creates a 60Hz low- level sound (approximately a low A), that seems to “hum.” It can be caused by adding new components to your system, but that does not imply there is anything electrically wrong with any new component. With the advent of audio/video and home theater systems, the problem has become commonplace. Generally, the cause is the Cable-TV incoming signal line. This new incoming line may add an additional ground at a different potential to the AC line ground of your other equipment (refer to note I and 2, to troubleshoot a hum problem). Note 1: Cable TV systems can sometimes contribute to ground loop problems which cause “hum.” To determine if your cable system is the contributing factor, disconnect the Cable-TV incoming signal line (round, 75.) at the wall, or the first component the cable is connected to (i.e. the cable box, or VCR). If the hum is no longer present, you must insert a “75. ground loop isolator” before reconnecting the line. You should check with your ADCOM dealer to obtain one. If the “75. ground loop isolator” works only partially or not at all, then please read note 2 to complete the troubleshooting procedure. Note 2: Make sure that the power amplifier is at least 6” from processor or other equipment using microprocessors. Usually putt...

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