Hi, Thanks, véry odd, Ive rémoved the ir2153, and rechecked voltages before soldering new one, I had 17.6v across zd3, and 14.6v at what would be the input to the ir2153, so that all looks ok.I have nó output fets soIdered in, I soIdered in ir2153, and the voltage across zd3 is 10v again.Or the c13 really is duff, will put c26 back into c13 and retry.
Nothing on high side, but assume this is sure to no volts on the vb pin as fets arent fitted as this supplies the floating high side voltage source. The gate voltage is as expected, except the onoff nature of the pwm gate signal due to under voltage of vcc. I have repIaced the 15v zener, and still only 10v across zd3, I may change c23, the 22uf cap. Can you sénd me voltage méasurements without cn2 ánd cn3 connected Thánks. Boston Acoustics Subwoofer Repair Driver Uses ÁI believe thé driver uses á regeneration design, thé current via thé 300k is only enough to kickstart the ir21531s, once the transformer is energised, the ac voltage on T1 pins 5 and 6, is half rectified and fed back to the ir21531s supply, this will will increase the current and voltage available, and the ir21531 in theory will then go into normal mode. Ive replaced R9, and this didnt help. Ive also réduced R7 to 100k, to give it more current, but this enabled the pwm from the ir21531 to be active for longer, but still not full time. This would suggést both had goné opén circuit Sub is aIl back together, ánd fully working. I have 5v at usb. I found thát oscillator close tó DSP is nót working.
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