DSP-A2 is the flagship machine, when the price is not low, amplifier repair work still can meet, it's not as Onkyo's flagship TX-DS989, but on the same level in the market is relatively small, but Onkyo 989 performance extremely stable, too few repairs, Yamaha has more bad, because his protection circuit was too much.2ZUservice manual download site
2ZUservice manual download site
Symptom: power without instruction, Yamaha didn't have this design, press power button the main relay disconnected immediately. Yamaha AV amplifier protection circuits are really my repairs and amplifier up to the most complex, watching the chassis air full of circuit boards, numerous links, where to begin is a difficult thing. Would like to start from the circuit diagram to protect as many as dozens of, a a check is not the real thing. Yamaha DSP-A2 and DSP-A1 this type of amplifier design with consideration of maintenance,2ZUservice manual download site
2ZUservice manual download site
Floor can be opened, in addition to decode Board basic basic circuit can be made without detection. Amplifier protection terms, broadly divided into two categories, one is the power button is pressed immediately subsequent electrical disconnect protection, this protection is serious, indicating circuit does not allow boot, usually to check the output voltage, supply voltage. Another kind is the main relay disconnect only after working for a few seconds, shows main circuit no problem is caused by a circuit protection, such as communication, decoding, a small voltage is abnormal.2ZUservice manual download site
2ZUservice manual download site
According to the machine's first main relay buck connected, measure each-channel zero-point voltage, no anomalies were found. But the machine circuit in more than one zero point detection, preamp is individually designed stand mounted, this Board also has test, measuring the output of the preamp Board circuit, which found the left channel outputs exception, will boot after losing its protection no longer protected after you repair the preamp Board testing machine troubleshooting.2ZUservice manual download site
2ZUservice manual download site
Yamaha DSP-A2 amplifier is DSP-A1 successor models, price discounts and fever of material aimed at closer to consumer markets, in terms of internal structure, and DSP-A2 also used digital/analog circuits completely separated from each other by design, AV and it turns into pure final stage power amplifier dual-use machines. Nominal output power is 100Wx5 of A2, the effect of front Mono 25Wx2, various channels all for isolation of high quality components, only the power transformer weighing 8.5kg. DSP-A2 core is YSS-918 in 2-channel sound field processing while loop uses 64 times the sampling,

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