No sound on a Yamaha NP12 Introduction The Yamaha NP12 piano is part of the Piaggero series. It uses a lightweight 61-key keyboard; the architecture is identical to the NP32 (76 keys). Fortunately, the service manual is available, as well as the datasheets for some key components. Yamaha NP32 Service Manual Asahi Kasei AK4430ET Datasheet Part 1 - Analysis The symptom is obvious: no sound at all. Going up the audio chain, it's easy to see that nothing is coming out of the stereo DAC, an AK4430ET from Asahi Kasei. The DAC-L and DAC-R test points remain at 0V. As a first tentative to fix the issue, the DAC has been replaced, without success. I also replaced C363 and C364, capacitors serving as a charge pump for the DAC: no change. Then I went into a deeper analysis, focusing mostly on the DAC Power supply All the DAC supply voltages are compliant with the datasheet: On input: VDD = CVDD = 3.3V VSS1 = 2mV VSS2 = 7mV H...
Parce que j'aime bien la musique. Parce que je trouve bien les instruments. Parce qu'il y a beaucoup de boutons. Et que j'aimerais bien jouer du piano.