I go to your colleagues, because we have not been able to walk this power for 2 months, a channel broke down (channel A). All components were desoldered to check one by one and an open resistor 47 omhs, a JE350 driver and a transistor 6531 and 6534. and a corcholata were found. everything was replaced but the problem persisted, it was decided to change the integrator 70413080 and CI 4560D but nothing, the tests have been done with a lamp in series, to avoid damage to the components. the clip stays on, curiously when we press the button on the crossover of the DDT goes out and when you put a signal even with the lamp you hear very loud and distort, and the cli turns on with very little volume, that with the lamp. I would like to see what ideas you can give us. Cheers