Resolving Problems

Use the chart on the opposite page 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 cre- ates 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, 75Ω) 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 “75Ω Ground Loop Isolator” before reconnecting the line. You should check with your ADCOM Dealer to obtain one. If the “75Ω Ground Loop Isolator” works only partially or not at all, then please read Note 2 to complete the troubleshooting proce- dure.

Note 2: Make sure that the power amplifier is at least 6” from the Preamp and/or Processor. Usually putting another component between them is sufficient to minimize the hum. If this does not reduce the hum, turn the system off and disconnect all Inputs from the amplifier. If the hum still persists, then your Dealer or Service Center must examine the amplifier. If the hum disappears, try another set of RCA cables. Connect one RCA cable at a time to see if one specific cable is responsible. If any or all cables cause the hum to appear, then the preamp or processor should be evaluated for proper operation by your Dealer or Authorized Service Center.

Troubleshooting Tip

Your GTP-860’s circuitry is built around advanced microprocessors. The GTP-860 may exhibit occasional anomalies arising from AC line surges, etc. If you experience unexpected behavior, or if the GTP-860 “locks up” and does not respond to control input, reset it by turning the front power switch off. (Do not use the remote control’s “power” button.) Wait 10 seconds and then turn the GTP-860 on. This will reset the internal control circuitry and solve most problems.

32 ADCOM GTP-860 OWNER’S MANUAL

GTP-860 specifications

The Adcom GTP-860 is a versatile audio component that seamlessly combines a high-performance stereo receiver and a multi-source digital preamp. Known for its robust features and reliability, the GTP-860 caters to both audiophiles and casual listeners, making it a staple in many home audio systems.

One of the standout features of the GTP-860 is its extensive connectivity options. With multiple analog and digital inputs, including optical and coaxial connections, users can easily integrate various devices such as CD players, Blu-ray players, and game consoles. The unit also includes a dedicated phono stage, providing support for vinyl enthusiasts. This wide range of connectivity ensures that users can enjoy high-quality audio from virtually any source, making it an adaptable choice for diverse audio setups.

The GTP-860 is equipped with advanced technologies that enhance its audio performance. It utilizes a high-quality digital-to-analog converter (DAC) that supports high-resolution audio formats, allowing for a richer and more detailed listening experience. The unit also features a built-in FM and AM tuner, enabling users to access their favorite radio stations with ease. The user-friendly interface and intuitive remote control further enhance the listening experience, allowing users to navigate through various settings and inputs effortlessly.

Another notable characteristic of the GTP-860 is its robust build quality. Constructed with premium materials, the unit not only looks sophisticated but is also designed to withstand the rigors of regular use. The solid chassis helps minimize vibrations, contributing to improved audio clarity and performance.

The Adcom GTP-860 is also known for its excellent sound staging and imaging capabilities. The unit is designed to reproduce a wide soundstage, allowing listeners to experience music as it was intended by the artists. The precise imaging ensures that every note and instrument can be distinctly heard, providing an immersive listening experience.

In summary, the Adcom GTP-860 is a feature-rich audio component that blends functionality and performance. With its versatile connectivity options, advanced audio technologies, and high build quality, it stands out as a compelling choice for anyone looking to elevate their home audio setup. Whether for casual listening or for critical listening sessions, the GTP-860 delivers on all fronts, making it a valuable addition to any audio system.