Re: my adcom GFA555-II won't power up,checked speakers...
These things are a *****, but. Check the electrolytics on the circuit brd. Adcoms are know for this problem. When they leak, they destroy transistors that the electrolite gets into. If the circuit board looks wet, them kiss it goodbye. Etches get eaten up and generally make the amp a brick. Adcom doesn't have replacement circuit boards Check all the fuses on the back panel too.. When something bad happens to these they also burn up a lot of ten ohm resistors on the heat sink boards. I may be able to provide a pdf on this unit.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Obviously you are going to use the Front pre-out's on the Sony to drive the Adcoms. its pretty straightforward, just do not use a speaker that is less than 8 ohms. and make sure that you always have the power switch off on the adcoms, let them sit off for 5 minutes, THEN hit the bridge switch on the back of the adcom's and follow their instructions for bridging. it's pretty easy and tough to go wrong. Good luck...Rob
No Power means no supply. Step by step troubleshooting is recommended. Start with the main source power,then the cable wires,then to the primary section of the circuit board.Some components may be busted already.
Check the Fuse. Unplug the AC first. If you replace the fuse and it blows again, disconnect all speakers, replace the fuse and turn on. If the fuse does not blow, chances are it is a speaker problem, Adcom builds some very solid product, I would suggest pulling the outdoor speakers and testing them.
Depending on what you are using, some outdoor speakers should never be taken out of the living room. If you still have an issue post a comment and I will help some more.
Try just the power amp on ..nothing connected no Dakiom thingy either. It's a matter of elimination. Start at the output device and work back. Keep the Dakiom out of the loop. If there's hum with just the Adcom..then it's the ADCOM