Output relay suction. After measuring amplifier work correctly, disconnect the input plugs, enter additional audio signals to sound. The voltage marked on the measurement signal processing Board is also normal. Oscilloscope signal, electronic switching circuit IC301 sent signals after the switch to the main control board, was flat on the plate at the bottom, from the Board's output socket P205A 1, 4 feet to the volume control panel, labeled TOLI/TORI. Transistors Q3183 and Q3283 is as mute control tubes, measured for the base 3.5 volts, and pipe work in off status, has the two signals, namely mute, decided to rip up the decoder Board. Remove the rear stumbled, there are few traces of corrosion on the front panel, place under a magnifying glass lines have rotted, and commissioning sound mute control signal disappears after treatment returns to normal.ujDservice manual download site