Onkyo 500, Onkyo 501, 502 bridges this is Onkyo's popular series of power amplifiers models, the price is not expensive in markets where there are a large number, this machine is turned on after electrical amplifier fault suction disconnect if a second contract, red light keeps flashing, repeat the boot as well. Power on relay protection circuit detected a second serious boot condition is not allowed. Dealing with the problem has a simple and very effective method, with a small wattage incandescent power relays switched on, then power on. Some short circuit parts will heat, but because a light bulb voltage drops without overflow and cause a more serious failure to expand. Amplifier operating voltage can no longer protect, you can easily measure. 5V,12V,15V voltage is easy to measure, such as in particular, and these voltages for amplifier is very important, if soon protection measured the voltages are not the problem.kpEservice manual download site
Measuring at this point, I-level operating voltages plus or minus 45 v, found that the channel is a bit bias touched all levels of amplification tube does not give off heat, also found no resistance the blackened phenomena observed. The promotion of this type of tube is a single piece shaft mounted on the circuit board on the rear amplifier Panel, there are five routes each channel between the two plates, one, both for positive and negative voltage signal output plus or minus two and a half weeks. Measurement comparison only around right channel not the same as measuring signal is also a power supply of the same voltage, normal should be plus or minus 1.0 Volts. Measure the out point-26 volts, explains that the real reason is to protect, and static equilibrium at the output voltage will be 0. With push plate disconnected, the output voltage is 0. Illustrate the problem in advance, further measurements revealed that push pipe A1024,C3206 damaged, replacement recovery unit circuit test machine properly. This amp is totally fixed, read more about Onkyo amplifier repair skills can refer to amplifier repair section of this site to other articles.kpEservice manual download site