Discussion on Onkyo amplifier maintenance methodsYJSservice manual download site
First, repair before the amp, you should first figure out the amp is under what circumstances damages, what happens, so that the initial judge amplifier damage of parts and components, narrowing the scope of repair. For example, when wiring speaker cable short circuit, speaker wiring exposed part of the head was too long or wire is not twisted into a bunch, then move caused by short circuit, accidentally into the water causing the amplifier to take white, after most power breakdown with a burned taste, these phenomena are checked before servicing the question clear, contribute to faster and more accurate troubleshooting, parts.YJSservice manual download site
Boot view, for a power amplifier, the trouble-prone parts when the zoom level, its high working voltage and current. But AV amplifier has the perfect protection circuit, to figure out these problems, it is necessary to know principle and circuit of the machine, and second, related techniques step by step according to check. Onkyo amplifier power is divided into two parts, the first is the standby power, and the second is mains power. Is the CPU of the standby power supply circuit operating voltage, mains power is the start signal sent by the CPU power on relay switched on, due to the small amplifier main transformer of power generally does not, at least 300 Watts or more, so the transformer primary resistance is below ten ohms, which makes many repairmen will not power on machine errors in judgment, main transformer is damaged. Mains power output of at least a set of positive and negative voltages, typically within a range of plus or minus 45 v to 60 v, some amplifiers by two sets, such as a set of positive and negative 35 kV, another set of positive and negative v, 50 through the relay time supply power amplifier circuit. In addition, there are positive and negative 12 or 15 v for positive and negative op-amp, 5 volt for decoding Board, minus 30 volts for display, and so on, the voltage in the circuit board is marked, if measured by tag there isn't too much of a problem.

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