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The last piece of electronic equipment that I repaired required replacing nearly electrolytic caps – 60 of them were surface mount that I simply replaced with regular axial lead caps. I don’t think I can measure the uf of the caps with my dmm. So even if they measure fine you need to look real carefully for leaking fluid or any sort of discoloration around them. In order to navigate out of this carousel please use your heading shortcut key to navigate to the next or previous heading.

Single Pulse Avalanche Energy Rated? The ADSE is datadheet bit sampling analog-to-digital converter ADC with a synchronous serial interface and low on-resistance switches for driving touch screens.

That makes it a bit easier – I’d replace the amp with as much power as possible. They might be diodes, transistors, or even voltage regulators. Unfortunately high ESR isn’t something that’s easy to test for.

I wasn’t sure what to check next. Also, use a flashlight and carefully inspect the PCB under each electrolytic cap.

After getting the simple based MC driver circuit working, we moved on to a controller with more features. It didn’t have a W amp for no reason.


(PDF) IRFP350 Datasheet download

PD Linear Derating Factor. There are four of them attached to that metal plate, and they are all the same unit. Depending on the voltages involved they may or may not be schottky’s. We need to test them first. Find the perfect Christmas gift with eBay this Christmas. I recommend to start working on the power supply section first, in my case, that’s building up the Zener diode voltage regulator.

The operation is similar to mode 1. But if those two pins are shorted together, or if it reads as total open circuit, the FET is definitely ifp350. Thanks fellas and feels good to be headed somewhere with this! Could always retro the enclosure if it is in good shape I can walk you through datasheeet if you can get access to the leads. Yeah I checked the driver with my dmm and got a 7. Good luck with your hunt – its half the fun!

Light blue looks like electrically insulating heatsink pad for everything that mounts to that piece of metal. All of this should be done with the power off.

Datasheet «IRFP350»

Using your multi-meter, put it into diode voltage test mode. Since it has been discontinued, Velodyne may be willing to give you a service manual or schematic.

Other than that I don’t “see” anything wrong and have no idea where to start with the dmm. They won’t release the schematic as the subwoofer as a whole is discontinued but they are still utilizing the amp in other subs. Here is the best pic I can take at this time If you could get a picture of those a little closer it might help. Don’t give up, the problem is there somewhere and its nearly always repairable! New refers to a brand-new, unused, unopened, undamaged item, while Used refers to an item that has been used previously.


There is good possibility that this is the same issue. It a class D amp – may need a load to operate. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. Information furnished by Intersil is believed to be accurate and reliable.

No matter what its not going to cost less than a few hundred unless he can fix that one cheap.

I have a dmm, but that’s about it for diagnostics If you can get multimeter probes to the component legs or where they solder to the board, you can check the body diode conduction irtp350 with a multimeter. Power amplifier circuit is very nice used for subwoofer applications with powerful bass tones. Looks like a irfpn?

Anyone here an Amp Mechanic? [Archive] – HTGuide Forum

Mark provided a great way to test the output transistors. I’m going to try and get to that tonight. K, back at this! There is no visible leaking or abnormalities around the caps.

Thus, in a pond with a water depth of 6.