[email protected] yamaha p4500 amp one chanel not working. once in prog. amp brust up because of high voltage both chanels.... But we repair one chanel its working but chanel 2 not working

U blew the amp on that channel and now it has to be repaired.

Go to "menu/Setup/Speaker level" and adjust the balance of L-R.See page 21 of the manual:
http://usa.yamaha.com/products/audio-visual/av-receivers-amps/rx/rx-v540/?mode=model

Hi Joel, although we've sourced detailed schematic for this P4500 amplifier, there are no many voltage details on it for manufactures sake. Anyway, mine findings are. Secondary winding on main transformer should supply no less than 2 x 75 volts which makes after rectifying and filtration no less than 2 x 90 volts on capacitors with amplifier without input signal. Also transformer has to be very "hard" , otherwise amp will start clipping before reaching stated wattage on output.

Hi I have a Yamaha DSP 3090 Amp my right main Chanel is not working Amp goes off when i try to put the power on i think it goes on protction mode?after trying for 5to10 times it comes on, test mode all chanels work well not sure whats wrong ? can anyone slove my problem

Change both left & right TDA7275 IC
Change all the 1uf 50v capacitors related to the IC,s

Thank you very much

contact me at [email protected]


thank you again

M.Fateh Almunajed

Most repair shops offer a warranty. If you've recently had it repaired, return it to the shop to have them check it out. If you continue playing it as it is, more damage may occur and the additional damage isn't likely to be covered by the warranty.