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This could be due to a faulty speaker relay (if your unit uses one). Normally, the unit will "wait" a couple of seconds after you turn the unit on. Then you will hear a "click" and the sound will begin coming through the speakers. If the relay is faulty, it would cause the problem you describe.
it may be an open input side coupling capacitor in the feedback circuit around the power amp. if the amp has a limiter in it it may be stuck. here is the service manual, in any case.
on bridge mode the speaker impedance should be 8ohms, less than this clipping will happen. try bridging two 4 ohms in series.
if this happens without speaker connected, u have a power amp section that is trying to draw more power than it can handle. as for the second check connections first, otherwise i suspect u have a defective power amp for the right channel.
C2 (330microF/25V)
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