Adcom Audio Players & Recorders - Recent Questions, Troubleshooting & Support

If your Adcom GTP-450 preamp is only working through an external processor, there could be several potential reasons for this issue. Here are some troubleshooting steps you can take to try to identify and resolve the issue:

1. Check Input Selection: Ensure that you have selected the correct input source on the preamp. Sometimes, if the incorrect input is selected, it may seem like the preamp is not working.
2. Inspect Cables and Connections:
   • Make sure that all cables (audio, video, power) are securely connected to both the preamp and the external processor.
   • Check for any loose or damaged cables. If you find any, replace them.
3. Verify the External Processor's Settings:
   • If you are using an external processor, ensure that it is set up correctly and functioning properly. Check its input and output settings.
4. Check for Mute or Volume Levels:
   • Verify that the preamp's volume is not set to zero or muted. Also, check the volume settings on the external processor.
5. Test Different Inputs and Outputs:
   • Try using different input and output connections on both the preamp and the external processor to see if there is any change in behavior.
6. Reset to Factory Defaults:
   • Consult the user manual to see if there is a way to perform a factory reset on the preamp. This can sometimes resolve software or configuration-related issues.
7. Firmware or Software Update:
   • Check if there are any available firmware or software updates for the Adcom GTP-450 preamp. Updating the firmware/software can sometimes address compatibility or performance issues.
8. Consult the User Manual or Manufacturer's Support:
   • Review the user manual for troubleshooting tips specific to your model. If the issue persists, consider reaching out to Adcom's customer support for further assistance.
9. Consider Professional Repair:
   • If none of the above steps resolve the issue, it may be a hardware problem. In this case, consider seeking help from a qualified audio technician or contacting Adcom for repair options.

Please be cautious when performing any troubleshooting steps, especially if they involve opening or modifying electronic equipment. If you're unsure about any step, it's best to seek professional advice to avoid potential damage.

If the power is not working on your Adcom GTP-860II preamplifier, there are a few troubleshooting steps you can try: 1. Check Power Source: Ensure that the power cord is securely plugged into both the preamplifier and a functioning power outlet. Try using a different outlet or power cable to eliminate the possibility of a faulty power source. 2. Power Button/Standby Mode: Make sure that the power button is in the correct position. Some preamplifiers have a standby mode, so check if the power button needs to be pressed or switched to turn on the unit. 3. Fuse: Check if the preamplifier has a fuse. If the fuse is blown, it can prevent the unit from receiving power. Replace the fuse with one of the same rating if necessary. 4. Circuit Breaker: Some preamplifiers have a circuit breaker that may trip if there is an electrical issue. Check if the unit has a circuit breaker and reset it if needed. 5. Internal Issues: If none of the above steps resolve the issue, there may be an internal problem with the preamplifier. It could be a faulty power supply, a malfunctioning component, or a wiring issue. In such cases, it is recommended to have the preamplifier inspected and repaired by a qualified technician or contact Adcom customer support for assistance. Remember to exercise caution when working with electronic equipment and avoid opening the unit if you are not experienced with electronics. It is best to consult a professional technician for any internal repairs or troubleshooting beyond basic checks.

There are several things that could be causing the lack of sound output from your Adcom GFP 710. Here are a few things to check:

1. Check the cables: Make sure that the cables connecting the preamp to the power amp and speakers are securely plugged in and in good condition.
2. Check the input selection: Make sure that the correct input is selected on the preamp.
3. Check the volume: Make sure that the volume is turned up and not muted.
4. Check the balance: Make sure that the balance is set correctly and not all the way to one side.
5. Check the output jacks: Make sure that the output jacks on the preamp are functioning properly.
6. Check the power supply: Make sure that the power supply is providing the correct voltage to the preamp.

If none of these solutions work, it is possible that there is an issue with the preamp itself. It may need to be serviced or repaired by a qualified technician.

Thanks for your suggestions. However I am using carefully boxed clean CDs and the skipping is on all. The Laser glass is clean. Since submitting the problem I removed case and the CD is lifted off tray by a lift motor which has a round nylon top on the shaft which "sandwiches" the CD against a freely rotating plastic piece in a lipped cylinder container. The lift motor then rotates the CD which is read by a separate fixed laser. My current suspicion is that the CD is slipping inside the rotating "sandwich". Hopefully someone who has worked on an Adcom GCD 600 can suggest a fix.

I thought it used a KSS-240 which is a Sony laser.
# will be on the laser and Mcm has it for I think $35

Back in the late 1980's the GCD-575 was about as good as you could get in CD players. Today it likely can still hold its own when rejuvenated to original operating condition when it left the factory (but can't play SACD's hires layer). Main problem... deteriorated main board soldering, a few hours with a solder sucker, (best to resolder use 2% or 4% silver solder everywhere) and replace 32 year old caps, and this set should equal the sound of a mega-buck player (also change the open/close belt). Modern caps are likely smaller so a 2,200 can be replaced by a 3,300 or 4,700 uF. part at the same voltage, etc. the output cap value should be doubled, and a bipolar used, or bypassed with a polypropylene or Teflon, IIRC plenty of room is available inside the case for either (or both). That is a lot of work. Well worth it. -Steven

https://www.diyaudio.com/forums/solid-state/236765-adcom-gfa-555-ii-blowing-main-line-fuse-ideas.html

This amp is not designed to be bridged and can not be used in the mode you wish. Sorry, but internal circuit changes would be necesary for the amp to work as a single channel.

Dan

Hello Curtis, comment that teams accompany the Adcom, to know where the signal arrives at the entrances of the GFA6000, I ask you this, to make a map of your sound system and try to find the possible place of failure Try the left and right speakers, in the outputs that work, it can be the Surround, to check that they are working I await your comment Greetings Franco Dosil Hola Curtis, comenta que equipos acompa?an al Adcom, para saber de donde llega la se?al a las entradas del GFA6000, te pido esto, para hacer un mapa de tu sistema de sonido y tratar de encontrar el posible lugar de falla Prueba los parlantes izquierdo y derecho, en las salidas que funcionen, puede ser las de Surround, para comprobar que est?n funcionando Espero tu comentario Saludos Franco Dosil

The manual does not specify a bridging option.

http://www.audioreview.com/cat/amplification/amplifiers/adcom/gfa-5300/prd_116265_1583crx.aspx

"Weaknesses:
Not bridgable."

Generally an amp that IS bridgeable uses the positive speaker terminals and some switching method to tell the unit to run as bridged. This is NOT a recommendation to try it on the 5300.

Check and download from service manual.com the operation manual.

Remove the output transistors and measure each of the sets of 3 pads and report the voltage readings here. I suspect that you have either a blown driver circuit or output transistors. The voltage readings will give me an idea on where to start looking for specifics.

Thanks,
Dan