Denon 1604 is a Dolby decoder is very common in the era of the AV amplifier, like ONKYO Onkyo 502, 500 and other models because these models are moderately priced, performance was just enough to meet the needs of ordinary home theater, more important reason is that Chinese consumers are highly favored @# brand to Japan. 1604 looks great,dCtservice manual download site
dCtservice manual download site
This amp has a character, only the AC switch on the Panel, there is no standby button, if used after remote shutdown, must use the remote control to open. The Denon 1604 symptom I repair to the coaxial input is silent, other input methods can work properly. Coaxial signal using a multimeter is undetectable, but can directly on the oscilloscope display, therefore, followed with an oscilloscope input signal to the coaxial signal-processing chip, LC89057W, 89057 chip digital signal conversion, together with the fiber-optic signal into the DTS decoding,dCtservice manual download site
dCtservice manual download site
This fiber optic input to function correctly, so chip damage may be large, observed 89057 information shows that it consists of four sets of channels, measure the voltage of the four groups is exactly the same shaft this group lower, measuring power, reset and clock are normal, try LC89057W replacement, troubleshooting.dCtservice manual download site