I have a BASH subwoofer amp that is measuring -14.7vcd unloaded across the output leads. One side of the amp is running much warmer than the other, but maybe that's okay on subwoofer amps like these? I'm hesitant to hook this amp up to my subwoofer even though large woofers can handle some DCV.
I sold a irs2092 based amp on ebay.
The buyer emailed me saying there was +17 volts DC on the output with no speaker connected.
So I checked one of my pcb's and so there was .
If I connected a speaker the 17 volts went to zero volts.
It looked like the 2092 stopped oscillating if there was no load.
I don't know enough about your amp to say this is the problem.
The buyer emailed me saying there was +17 volts DC on the output with no speaker connected.
So I checked one of my pcb's and so there was .
If I connected a speaker the 17 volts went to zero volts.
It looked like the 2092 stopped oscillating if there was no load.
I don't know enough about your amp to say this is the problem.
That's good to know. I'll connect a cheap woofer from the parts box and see if I get the same thing.
Glad I went with the resistor... I hook up a 5w 8ohm resistor to the amp, no input, turn the amp on to test. As I was measuring -12vdc across the leads (a bit of a drop), the resistor cooked.
Is it a split rail amplifier ?
If not it might need an output coupling capacitor.
Have you got a schematic ?
If not it might need an output coupling capacitor.
Have you got a schematic ?
It looks most likely it is dual rail.
So its probably got a fault somewhere.
I couldn't find a schematic online.
So its probably got a fault somewhere.
I couldn't find a schematic online.
It is not dual rail - I have just purchased two of these on eBay (both in working condition).
http://www.ebay.com/itm/221730193519?_trksid=p2057872.m2749.l2649&ssPageName=STRK:MEBIDX:IT
This board is the same used in the Boston Acoustics PV 1000.
Based on other Bash amps I fixed, the first test would be disconnecting the power supply from the amp output portion (in this case on the same board).
You should be measuring about 10 V across +/-.
If not, it is likely that the power supply is bad (usually due to problems with the output transistors).
Please contact me via PM - perhaps I can be of help.
http://www.ebay.com/itm/221730193519?_trksid=p2057872.m2749.l2649&ssPageName=STRK:MEBIDX:IT
This board is the same used in the Boston Acoustics PV 1000.
Based on other Bash amps I fixed, the first test would be disconnecting the power supply from the amp output portion (in this case on the same board).
You should be measuring about 10 V across +/-.
If not, it is likely that the power supply is bad (usually due to problems with the output transistors).
Please contact me via PM - perhaps I can be of help.
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I just got off the phone with Chris from James Loudspeaker and he said the amp should not have 14V of DC present at the output. His first thought was a grounding issue, but his final consensus was the amp needs to be replaced. He said those amps have a history of failing, and they are suggesting full replacement with a different product.
Let me clarify just in case... 🙄
You should be measuring about 10 V across +/- of the power supply rails, not at the speaker outputs.
This is information found in several Bash-based service manuals.
If you decide replacing the amp with a different one, please let me know if you want to sell the defective original Bash amp.
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