My Adcom GTP 502 sometimes works with the remote and sometime don't. What could be the problem ?

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.

It sounds as though a remote control button is stuck or perhaps one of the remote control sensors within the unit itself. I would imagine this piece of equipment to be well worth repairing and likely the most cost effective avenue as well.

There are several fuses inside the unit @ power supply module, you may check them. If no luck you may send your unit for repair to ebcelectronics

Make sure there's plenty of ventilation around the Tuner. Overheating can cause premature failing of internal components and other weird things to happen. All to often, electrical components get stuffed in a cupboard or in a shelf with inadequate ventilation that can cause your problem.
Just a thought!

This is not likely a power supply problem, but is isolated before the pre-amp stage. This can be a defective IC in the preamp stage as well.

Adcom schematics are not generally available, but you may be able to isolate the problem with a little experimentation. Try to run a signal through to see if you can get the signal as well.

Please update this with your results.

Thanks,
Dan

The filter capacitors are probably going bad is the likely cause.

It may also be bypass capacitor in the preamp section.

Noting whether the hum volume varies with the setting of the volume control would aid troubleshooters.

One might be able to isolate the bad component with freeze mist/circuit cooler.

I have a GRC 815 remote for sale : [email protected] email me, me can work it out

Unfortunately the display for that model is not available/discontinued.

If pushing the power button does nothing, the unit is probably in "protect mode". This means there is an internal problem and will require professional service.