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.
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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.
Starting with it turned it off, press and hold the PWR button for some 4 seconds, until its indicator light is steadily lit. It is in pairing mode now. Then, bring your phone next to it, and make its bluetooth application search for new devices. After a little while, the HBM-760 should appear on-screen. Select it and make it connect. If a pairing code (or PIN, or passkey) is requested, enter '0000' (four zeros). If the pairing process is successful, your headset should enter the stand-by mode. Anyway, if its user guide happens to be missing, feel free to download it from this location. Hope you are able to sort your problems out soon. Anyway, please, let me know if I can help you any further. Regards, Carlos
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.
power on , but nothing come off,
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