Recently I got dead PSB Subsonic 6i Subwoofer from local market. I opened it to see the internal components for visible damage which cause it to became dead. I found 1 capacitor (220uf 50v Bipolar) and 2 transistors (Q401 & Q402, may be IRF730x2) are missing from the pcbs. So guys can you guide me make my woofer live again?
Try an ohm meter across the woofer terminals, what does it read.
If you do not know enough about electronics, take it in for repair.
If you do not know enough about electronics, take it in for repair.
Sir I already said that Q401 & 402 mosfet transistor missing, and 220uf 50v Bipolar Capacitor missing. That means I have basic knowledge of electronics. No need to check woofer driver ohm. I would like to know the value of Q401 & 402, and idea about C1 & C2 capacitors (originally is it 220uf 50v bipolar or something different).
Bipolar capacitors could be present to high pass the signal to the main loudspeakers and therefore can be omitted if those loudspeakers would not be connected to the subwoofer. Missing components usually indicate that the circuit already was broken and someone scavenged those components for other uses.
That’s a BASH amp design. Indigo (manufacturer of BASH amplifiers) won’t release any schematics or service info unfortunately. It’s a complex power supply, but I’m wondering why Q401 and Q402 were pulled? I believe they are IRF930 and IRF5930. I’ll double check later.
As I mentioned earlier I got it in dead condition I thought its easy to repair this woofer but I am wrong because without schematics or service manual its very very hard to repair this woofer.
As per my knowledge there is little difference in Subsonic 5 and subsonic 6 design. And as per sobsonic 5 manual(as well as some research of internet) Q401 & Q402 are IRF730.
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