Мои познания в ремонте данного вида техники: Занимаюсь ремонтом Наличие схемы: no Hello to all,
The channel 3 of this amplifier has a strange behavior. Channels 1, 2 & 4 work without problems. The test is done without input signal and with no load at the output. CH 3 output DC = 0V. When I adjust the volume, after a few steps I start to see -2.5V at the output and signal LED blinks. After one more step (volume knob click) all LED's start to blink (all channels) and output voltage rises (voltage spikes)! I think this problem is control/firmware related like what we can see in this video: https://www.youtube.com/watch?v=FUQbrpQqiyQ If the problem is the ATmega microcontroller (AT90S2313), then I need the Firmware of it to program a new one. To find that is going to be almost impossible! I am pretty sure that it is not possible to read the contents of the microcontroller that is in this amplifier!
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