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Old 06-25-2022, 07:41 AM   #1
zen
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Default Intimidation Professional sub advice please

Hi all

Far as i can tell this unit not producing any audio , although customer mentioned it does , but distorted .

Anyway , started by testing impedance of main driver speaker .


Measuring 80R , which i have not experienced before .


Anyone familiar with this unit enough to know ?


Can't seem to find any info on it .

See picture of label on speaker .
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File Type: jpg Speaker label.jpg (436.0 KB, 14 views)
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Old 06-25-2022, 11:24 AM   #2
R_J
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Default Re: Intimidation Professional sub advice please

Most of the Blastking drivers seem to be 8Ω
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Old 06-27-2022, 02:53 AM   #3
zen
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Default Re: Intimidation Professional sub advice please

Thanks RJ for confirming .

Will test with another driver & report back
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Old 06-27-2022, 08:34 AM   #4
zen
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Default Re: Intimidation Professional sub advice please

Tried one of my chunky 4 ohm speakers on this unit , but still no audio .
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Old 06-27-2022, 10:48 AM   #5
zen
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Default Re: Intimidation Professional sub advice please

Have a feeling there's an issue on the input board .

Became suspicious when i noticed the LED for signal wasn't registering .

Also cannot scope any audio on ribbon lead from input PCB to MAIN , although if i poke around on main , can measure an extremely low peak to peak audio signal.
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Old 06-28-2022, 06:49 AM   #6
zen
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Default Re: Intimidation Professional sub advice please

Some progress made on this unit .

Discovered a low reading of 30R between pins 15 & 13 of U15 ( IRS2092S ) , compared to same measurement on other channel , which was over 4K .

It's a drive chip for one of the channel output devices , which seemed to have survived .

Surprised protection mode didn't kick in .

Still not sure about the speaker impedance .
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Old 06-28-2022, 10:21 AM   #7
R_J
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Default Re: Intimidation Professional sub advice please

There likely is no protection circuit. I suspect the output mosfets could also be bad, I see what looks like a lead trimming or solder splash on the mosfet lead in the lower left of your picture.
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Old 06-29-2022, 03:11 AM   #8
zen
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Default Re: Intimidation Professional sub advice please

Hi RJ , there is an LED on unit labelled protection .

I did notice the solder splash also , but suspect that's during manufacture , as it doesn't seem unit has been opened before .
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Old 06-29-2022, 06:30 AM   #9
zen
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Default Re: Intimidation Professional sub advice please

Pulled out the driver , which has a larger diameter than any pizza i have ever seen , 47 CM in fact .

Now impedance reading 1R2 therefore assume it has shorted turns .

I guess it should be a 4 ohm .

Not sure why the high reading before . Quite possibly meter probes not contacting fully .

Any suggestions for a replacement .
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Old 06-30-2022, 08:40 AM   #10
zen
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Default Re: Intimidation Professional sub advice please

With the added cost of bass driver customer has decided against repairing .

Not having a particularly fruitful week .
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