I picked this subwoofer up in the alley- don't laugh, you'd be AMAZED at how much I've made off of eBay from this alley. I live near U. of L. and these kids throw stuff out when it gets dirty. Anyway- it had low output, and after a while it shut down. It has an STK 4132II stereo output IC. Simple, replace the amp, right? It still shut down. Ah, I re-used the thermal grease, must be the problem! -Nope!
I have the schematic, but it's tiny. So tonight I'll enlarge it and tomorrow check for DC offset at the output. Any other ideas would be appreciated. Thanks, Terry

:I picked this subwoofer up in the alley- don't laugh, you'd be AMAZED at how much I've made off of eBay from this alley. I live near U. of L. and these kids throw stuff out when it gets dirty. Anyway- it had low output, and after a while it shut down. It has an STK 4132II stereo output IC. Simple, replace the amp, right? It still shut down. Ah, I re-used the thermal grease, must be the problem! -Nope!
: I have the schematic, but it's tiny. So tonight I'll enlarge it and tomorrow check for DC offset at the output. Any other ideas would be appreciated. Thanks, Terry
:
Terry

Have been into a Aiwa subwoofer before. They have a power transformer, regulator circuit, and zener diodes. If it shuts down, it's because the voltage is running high. Look on that tiny print you say you have with a magnifier glass. Check the regulator. It is probably shorted. Will also toast little low value resistors too.

:Have been into a Aiwa subwoofer before. They have a power transformer, regulator circuit, and zener diodes. If it shuts down, it's because the voltage is running high. Look on that tiny print you say you have with a magnifier glass. Check the regulator. It is probably shorted. Will also toast little low value resistors too.
:

:Have been into a Aiwa subwoofer before. They have a power transformer, regulator circuit, and zener diodes. If it shuts down, it's because the voltage is running high. Look on that tiny print you say you have with a magnifier glass. Check the regulator. It is probably shorted. Will also toast little low value resistors too.
:

Don't know what model you are working on. Some are more sophisticated. The few I have worked on were heavy and powerful. had regulators, zener diodes, and a lot more circuitry than you describe. I would think your filter capacitors are okay, if they were holding a charge.

:Don't know what model you are working on. Some are more sophisticated. The few I have worked on were heavy and powerful. had regulators, zener diodes, and a lot more circuitry than you describe. I would think your filter capacitors are okay, if they were holding a charge.
:

::Don't know what model you are working on. Some are more sophisticated. The few I have worked on were heavy and powerful. had regulators, zener diodes, and a lot more circuitry than you describe. I would think your filter capacitors are okay, if they were holding a charge.
::
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:Yeah, you're probably right. It's really cheap junk, (50 watts), and I should eat the $17 I've got in the STK and forget it. But I'm sure you also hate to get into something and not fix it. I've always said that- "give me enough time and the right test equipment, and I'll fix it". Sometimes, though, it's good to know when to quit. Thanks for your support. Terry
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WOW! You should see the stir I caused on the ARF forums section. Who knew???
Got any ideas on a Philips TV shut down after power lite starts blinking? Just askin'
Seems I'm having shut down syndrome!!
Terry

Re-solder all the pins on the fly-back transformer to the PC board. Check the CRT socket to PC board too.

:Re-solder all the pins on the fly-back transformer to the PC board. Check the CRT socket to PC board too.
:
Thanks, Terry