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Many receivers have a thermal "overload" switch that will shut down power to protect the rest of the unit if it senses an issue like excessive heat, or if the ohms or impedance gets too high. This is a safety mechanism and you should probably seek a qualified audio repair shop for further troubleshooting.
sounds Like a power supply issue and u should always have speakers connected before u turn on maybe power supply is about done open case an check for any leakage on power supply unit or small cracks on it ...if so its pretty well done
Never good to power up without speakers connected can blow power outputs
In the first place I was wondering if you connected the set to the dimmer for a current test. Now did the fault occur after this was plugged into the dimmer or did the amplifier show fault prior to the test. Remove power plug and test the main fuse. If there is no supply to the sections, then you need to check the power supply. If not the receiver can be on a protect mode. If so the set will come on and shut off and if so the outputs must be checked, remove speakers to confirm if the amplifer works, if not the boards must be tested one by one to confirm. Use a multimeter for a continuity test for a short or a voltage test for a missing volage to the board.
So you're saying ac doesn't get very far into the unit. THAT should be easy to diagnose with CARE since ac is usually passed unmodified to the fuses and power supplies, maybe through a relay. Get a digital voltmeter and find out where it disappears after getting into the unit.
Hi, i have similar/same problem, on initial power on, you have after 3 -4 secs an audible click from inside and all is good... if you then try to change inputs either via front panel and or remote, the unit switches off. if you change input prior to audible click, ie within 2-3 secs of power on , all is good and amp works fine, until you change input etc...very painful fault.. i thought it is sensing /checking the speaker outputs and detecting short etc ,so powering off to protect.. but then just my thought, i suspect something else, if anyone has the fix and can repair , please let me know.
Disconnect everything from the amp except the power cord, then power on the amp. If the receiver still shuts down, your problem is inside the case and unless you can perform electronic repair yourself you will probably need to take it in for service. If it does not shut down with nothing connected, power it off, connect one speaker or component and power on again. Repeat the process until the amp shuts down and you may have found the bad speaker or other component.
I have the same problem. my sandby light is on but my receiver will not turn on! I checked my power going into the power supply board that was good. But i do not have power going to the transformer or the receptacle. And both of my fuses r good. check ur fuses and go from there . If u know how to get a power supply. please let me know.