Adcom GTP-880 owner manual Resolving Problems, System Reset

Page 48

Resolving Problems

Use the chart on the opposite page to solve common situ- ations that don’t require professional attention. If the steps stated in possible solution do not resolve your prob- lem, 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 dept.

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 com- mon 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 sys- tem, but that does not imply there is anything electri- cally 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, discon- nect 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 pres- ent, 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 procedure.

Note 2: Make sure that the power amplifier is at least 6” from the GTP-880. Usually putting another compo- nent 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 autho- rized service center.

System Reset

In rare cases the GTP-880 internal processor may freeze or lock-up causing abnormal operation. This is common to all micro-processor controlled devices when the unit is subject to excessive static discharge, AC line noise, or power spikes.

In most cases it is easy to solve this problem by simply unplugging the GTP-880 from its AC power source for about five minutes. After waiting, reconnect the power cord and turn the unit on. If the unit functions normally, no further action is needed.

In the event that the unit still does not operate prop- erly, it may be necessary to manually reset the proces- sor. Note, however, that when the processor is reset you will lose all settings including digital audio assignments, surround mode settings, speaker configurations, tuner presets and any other memory items. For this reason we strongly recommend that you record these settings so that it is easy to restore them after resetting the processor.

To reset the unit to factory default settings you will need to enter the discret remote control command. Please refer back to the discrete remote control commands table. The command name is “Factory Defaults”, the IR code is 86h. This should reset the system.

If the manual reset does not solve the problem, contact your authorized ADCOM dealer, an authorized ADCOM service center or contact ADCOM’s service department directly for further advice.

48 ADCOM GTP-880 Owner’s Manual

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Contents Page Welcome Remote Control SetupDescription of Unit Outdoor Antenna Grounding Unpacking the GTP-880 Adcom Protection Plan USA onlyInterface Overview Bass & Treble Adjustments Analog Direct SelectionsTo operate the tuner Volume control Source ButtonsSurround Mode Buttons Surround Format InformationAdditional Information Placement of your GTP-880 AC Input Input & Output System Connections Video 2 Component InputMonitor Component Video Output 15 AM/FM Antenna InputsComposite Video main Output 20 12V DC Trigger main/roomRoom 2 Analog Audio Output 23 RS232 Control DB9Connecting Components Main Analog Audio outputsExternal Amplifier DVD PlayerOutput jacks supplied by the GTP-880 are CD Player Audio RecorderVideo Components Video RecorderSatellite Tuner or Television Video DisplayPage Page Page Connection Diagram Analog Source GTP-880 Tuner PreampConnection Diagram GTP-880 Video Outputs GRC-810 Remote Control Power ButtonDirect Access Keypad Main ButtonRemote Features 32 Main Button Volume Up & Down ButtonsOverview of the GRC-810 Navigation & Select Buttons Direct Analog Input Buttons48 Ch. Trim & FM/AM Button 49 Ch. Cal & Memory ButtonButtons Function CD Function VCR Vunction Video Page Using Pre Programmed Commands Programming Your Own CommandsDeleting Individual Commands Programming the GRC-810 RemoteDeleting all the Commands for Every Source Component Programming Macro ButtonsDeleting Macro Initiator Buttons Command GTP-880 Function Commandfront GTP-880 Function Setup Overview Input ConfigurationOn Screen Display To turn the GTP-880 onSpeaker Configuration Speaker PlacementTo configure an input To configure the GTP-880 for your speaker system Channel Configuration Calibration To set the channel levels for you systemTo set channel levels using the test tone function To adjust channel trim from the main menuChannel Trim Delay Configuration To adjust channel trim using the trim functionTo set the speaker distance delays for your speakers Setting the OSD Time Out Sleep TimerTo set the sleep timer from the main menu To set the front panel display brightnessAnalog Level Input and Peak Indicator Pro Logic II and NE06 Music ConfigTo turn on theater compensation using the th-eq button Theater CompensationRoom Two Configuration To adjust the Plii Music ParametersTo adjust the room two settings To lock a specific surround mode To enable/disable Night Mode compensationDynamic Range Page Installer’s Notes Resolving Problems System ResetSymptom Possible Reason Possible Solution Caring for your GTP-880 ServicingGTP-880 Specification Preamplifier Analog SectionAdcom

GTP-880 specifications

The Adcom GTP-880 is a high-performance home theater preamp and processor that has garnered attention for its impressive features and audio quality. Designed for audiophiles and home theater enthusiasts alike, the GTP-880 stands out due to its versatile functionality and advanced technology.

One of the main features of the Adcom GTP-880 is its multi-channel audio processing capability. Supporting formats such as DTS, Dolby Digital, and several others, this preamp ensures that users experience immersive sound in their home theater systems. This cinematic audio experience is complemented by a well-executed surround sound setup, allowing users to achieve the kind of high-fidelity output traditionally found in professional environments.

The GTP-880 is also equipped with a range of inputs and outputs that enhance its versatility. It includes multiple digital inputs - including coaxial and optical options - alongside standard analog inputs. This extensive connectivity makes it easy to integrate various devices from CD players to gaming consoles, ensuring flexibility in how users configure their systems. Moreover, the inclusion of balanced XLR outputs aids in minimizing noise for clearer sound reproduction.

Technologically, the Adcom GTP-880 employs advanced circuitry designs that contribute to its high-performance audio. The use of high-quality components offers not only durability but also superior sound fidelity. It also features a sophisticated user interface that makes navigating options effortless, including customizing sound settings and adjusting levels.

In terms of build quality, the GTP-880 showcases an elegant design that fits seamlessly into most home entertainment setups. Its sturdy construction ensures reliability and longevity, while the sleek appearance makes it a visually appealing component in any audio setup.

Another notable characteristic is the remote control functionality, which adds convenience for users looking to manage their home theater system from a distance. Additionally, the unit provides multiple setup options, catering to different room acoustics and personal preferences.

In summary, the Adcom GTP-880 is a remarkable preamp and processor, marrying advanced audio processing technologies with excellent build quality and flexibility. Its blend of features allows for an unparalleled audio experience, making it an ideal choice for home theater aficionados seeking to elevate their audio experience. Whether it’s for movies, music, or gaming, the GTP-880 stands as a formidable choice in the landscape of home audio equipment.
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