This is my last resort!
I have a BIC V1020 powered Sub-Woofer that blows fuses.
In searching for schematics and info, I find that the power supply pcb is by indigo which provided this pcb to BASH, as well as the unit supplied by Gateway.
Without schematics, I am isolating circuit flow by removing components. This is not the best way, so that is the reason I am here.
Can someone help me? Direct info is good as well as a pcb schematic.
Thank you,
Dick
Phelan, CA
I have a BIC V1020 powered Sub-Woofer that blows fuses.
In searching for schematics and info, I find that the power supply pcb is by indigo which provided this pcb to BASH, as well as the unit supplied by Gateway.
Without schematics, I am isolating circuit flow by removing components. This is not the best way, so that is the reason I am here.
Can someone help me? Direct info is good as well as a pcb schematic.
Thank you,
Dick
Phelan, CA
Have you checked the driver for shorts? The Re of the driver. You could use another (known to be good) driver to check the amp.
When does the amp blow the fuse? On startup, after a while, at high output, etc.
When does the amp blow the fuse? On startup, after a while, at high output, etc.
The fuse is blown when AC power is connected and before any switches, or input is connected. The fuse shows a large current flow blowing the element.
I pulled the bridge rectifier and the fuse does not bow. But, that really doesn't mean much as the rectifier is before capacitors and circuit beyond.
Ok, I think I found the problem:
All Capacitors checked ok.
One FET; IRF730, was shorted "0 ohms"!
Since I do not have a schematic and the pcb does not mark the components,
I cannot list it.
I found replacements on eBay, so will wait for arrival.
All Capacitors checked ok.
One FET; IRF730, was shorted "0 ohms"!
Since I do not have a schematic and the pcb does not mark the components,
I cannot list it.
I found replacements on eBay, so will wait for arrival.
A lot of parts on ebay are fakes especially if ordered from China (Hong Kong), so beware.
Power the sub with a "dim bulb tester" after replacing the MOSFET just in case there is still a fault that may have blew it to begin with.
Power the sub with a "dim bulb tester" after replacing the MOSFET just in case there is still a fault that may have blew it to begin with.
Thank you for your warning. I knew vacuum tubes were faulty but had not heard of other parts. Does this mean my iPad is not good?😱
I don't know about that, but I bought some TDA2040 and 2050 ICs and none of them were authentic. I tried LEDs from several different ebay vendors and they last a week to a month before becoming very dim. Electronic parts on the 'bay is a racket. I get stuff from Digikey now.
I installed good FET's onto the pcb. Plugged it into AC and the power light went on for about one second and the fuse blew!
It is hard to troubleshoot without a schematic, it would be great to get one. Does anyone have one? TIA,
Dick
Phelan, CA.
It is hard to troubleshoot without a schematic, it would be great to get one. Does anyone have one? TIA,
Dick
Phelan, CA.
I solved my problem the easy way.
BIC America would not provide a schematic but would sell me a new Amplifier (the whole electronic pcb's & external panel) for $100. That is the same price as smaller size ( and power) subwoofer, so I purchased it. It works, problem solved!
Please post a schematic should one become available.
BIC America would not provide a schematic but would sell me a new Amplifier (the whole electronic pcb's & external panel) for $100. That is the same price as smaller size ( and power) subwoofer, so I purchased it. It works, problem solved!
Please post a schematic should one become available.
I am looking for schematic for PSB subsonic 6i Subwoofer. It has Indigo Bash Circuit like 600131, 630136 Rev 1, 650038 Rev 0. Please help me to solve the issue of my psb woofer.
Bought this subwoofer three years ago, a good sub, like it.
Two days ago, I noticed the red power LED was not on, found the fuse was blown, I bought a 1.6A250V fuse, which was blown instantly on power up, the red power LED blinked on then off, and I heard subwoofer rumbled, meaning power supply part of the amplifier could be working, the problem should be on amplifier side.
I opened up the circuit board from back, main board was made by Indigo, Indigo 60088R5. I thought it could be the power amplifier MOSFET IRF640N failed. There are two of them, I used a digital multimeter on selector diode, checking resistance between D(drain) and S(source) with everything disconnected. One MOSFET was found around 0.5 both ways, the other one was tested 0.5 only when red lead on D and black lead on S, and it was unlimited the other way. I though the first MOSFET was gone.
I went to my local electronic store the last minute before the store was closed for the day. Bought four IRF640N and a small bag of silicon, used one IRF640N for replacement of the dead one, and fixed the problem. Subwoofer works again.
Li
Toronto ON