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Old 10-20-2018, 04:19 PM   #181
electricboyo
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Default Re: Infinity PS-12 Powered Subwoofer Fired Amplifier

Always use a “dim bulb tester” to apply mains power to these types of amplifiers. 60W or 100W conventional incandescent light bulb is about the right size. You need to get the amplifier to the point where it can play sound at low to moderate volume before applying “full” mains power to it.
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Old 11-26-2018, 11:01 PM   #182
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Default Re: Infinity PS-12 Powered Subwoofer Fired Amplifier

Got my PS-12 fixed too! Sub was humming while sitting at idle (no sound). Hum went away when I replaced the C72 capacitor.

Also the sub was making chirping noises. Noticed the light in the back flashing frequently between green and red. Could also hear internal circuitry noises (if I get up close to it), as if circuits were being activated and disabled quickly, on the order of about six times each second. Replaced the C2, C37, and C65 capacitors and all of those noises went away.

Big thanks for all the contributions to this thread! #righttorepair
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Old 02-05-2019, 04:33 PM   #183
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Default Re: Infinity PS-12 Powered Subwoofer Fired Amplifier

Hi everyone,

I just acquired a PS-12 and the cap is blown(of course.), but it also burned the board...

Is this fixable? I have not seen another one that is burned this much...

https://imgur.com/gallery/mfwxtNk?fb...YF9kI2iZClRpwU
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Old 02-12-2019, 09:35 PM   #184
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Default Re: Infinity PS-12 Powered Subwoofer Fired Amplifier

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Originally Posted by rxm9600 View Post
Is this fixable? I have not seen another one that is burned this much...
I don't see any burning at all. If you are referring to the brown stuff around the big caps - that's just glue used to hold down the caps at the factory.

Should be fixable if there are no other dead components, aside from the bad cap(s). On that note, I recommend replacing all electrolytic capacitors in this unit. At least that would be the first part in the repair process for this unit.
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Old 02-12-2019, 10:02 PM   #185
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Default Re: Infinity PS-12 Powered Subwoofer Fired Amplifier

Yep, just bad brown glue.
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Old 02-15-2019, 02:28 PM   #186
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Default Re: Infinity PS-12 Powered Subwoofer Fired Amplifier

Quote:
Originally Posted by budm View Post
FORCED ON circuit.
My sub has problem switching from red to green. I repalced most of the capacitors although they all looked good.
C2/12/35/37/39/41/78.
I also replaced Q2 with 2N5550 equivalent and Q3 with 2N5401 since I could find the original parts. Are these the right ones?

My sub switched to green now. But no sound when I connect to the amp. If I played from my phone, I'd get sounds.
What other parts I need to replace. Also, C71/72/73/74 still have 0V.
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Old 02-15-2019, 10:08 PM   #187
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Default Re: Infinity PS-12 Powered Subwoofer Fired Amplifier

Quote:
Originally Posted by momaka View Post
I don't see any burning at all. If you are referring to the brown stuff around the big caps - that's just glue used to hold down the caps at the factory.
The last few pictures show a hole burned in the board under the blown cap. You have to load the last seven pictures.
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Old 06-08-2019, 08:38 AM   #188
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Default Re: Infinity PS-12 Powered Subwoofer Fired Amplifier

I am not familiar with the "dim bulb tester" that Electricboyo mentioned above. Is that an incandescent bulb in series with the 120 volt input to act as a fuse?
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Old 06-09-2019, 06:52 PM   #189
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Default Re: Infinity PS-12 Powered Subwoofer Fired Amplifier

That is correct. You can Google and there is a ton of info on this. Make sure you are careful to take precautions so that you do not get electrocuted as this involves 110VAC household mains supply. If you are not sure, get it checked out by a qualified person.
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Old 06-09-2019, 07:03 PM   #190
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Default Re: Infinity PS-12 Powered Subwoofer Fired Amplifier

Quote:
Originally Posted by Mwitte View Post
I am not familiar with the "dim bulb tester" that Electricboyo mentioned above. Is that an incandescent bulb in series with the 120 volt input to act as a fuse?
Exactly!
https://www.badcaps.net/forum/showpo...4&postcount=70
.
.
Note, however, that it won't actually act as a fuse; it will behave more like a current limiter. How much current goes through depends on the load you put on the power supply. Generally, you won't be able to run most power supplies with any significant load with the dim bulb tester (due to increasing voltage drop across bulb with increasing load.) In most cases, the dim bulb tester is just enough to allow the power supply to turn on and show you that nothing is shorted on the primary (i.e. bulb will go bright/lit otherwise.) But that is still very useful.

In the case of amplifier PSUs, though, I've found that typically you can run the amp at a very low to medium volume to test the operation. To allow for a bigger load, you can use two or three series bulbs all in parallel or a single 100-300W bulb.

Last edited by momaka; 06-09-2019 at 07:05 PM..
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