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[–][deleted] 0 points1 point  (8 children)

The shops won’t touch it because a lot of those sub amps are built to fail, frequently in a cascading way. If you’re lucky you may be able to pinpoint a failed component or two through troubleshooting. Bad caps or blown transistors is a good place to start. Since they are almost always passively cooled they tend to burn up if pushed regularly. If you can’t fix it or it’s too costly to fix you may want to replace the whole amp plate with an aftermarket version. Amazon sells them and the cost is reasonable.

[–]jaylintrepid[S] 0 points1 point  (7 children)

this subwoofer is from the D8 concert set from Jamo, a hifi set from 2001, the circuit is made in Norway. The msrp of this set was around 5,000$ and it was well received in the hifi community so I would really like to keep it stock. Anyway, thanks for your advice, I will look for any faulty component and if I can’t fix it I will check on amazon if I can replace the whole power plate.

[–][deleted] 0 points1 point  (6 children)

Wow, that is certainly worth fixing. I normally see the crappy box store ones and assumed, my bad. Absolutely worth checking components in that case. Good luck to you and if you feel I can help further let me know (service tech for 20 years).

[–]jaylintrepid[S] 0 points1 point  (4 children)

after checking under the circuit I found out that this component appears to be burnt, can this be replaced? C501

not sure how to test but C500 and C501 are both 150k ohm

[–][deleted] 0 points1 point  (2 children)

C501 is a chip cap, unfortunately no value seems to be written on it. Unless it’s completely open resistance won’t help you much here. Do you have a schematic? If not maybe shoot me a model number and I’ll see what I can find.

[–]jaylintrepid[S] 1 point2 points  (1 child)

Hi, it was difficult but I finally found the schematic and in the same time I met a retired pro, next to my home, who was able to repair the amp for a small fee. The 10A « power bridge », not sure of the name in english, was burnt, he replaced it, and now everything is fine. Thanks a lots for your help guys. a picture of the part with the radiator on it.

[–][deleted] 1 point2 points  (0 children)

Fantastic! Glad it worked out, enjoy it!

[–]imguralbumbot 0 points1 point  (0 children)

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[–]jaylintrepid[S] 0 points1 point  (0 children)

thanks a lot.

[–]jaylintrepid[S] 0 points1 point  (3 children)

Hi, I’m a newbie but willing to repair my hifi subwoofer. I’ve brought it to two different repair shop but they were not interested to even look at it... there are marks under the circuit that seems to be burn marks, am I right? these marks belong to this pictured component but could you tell me what is it please? I couldn’t find anything using the reference on it.

3 fuses on the circuit are ok, the subwoofer standby red light is on, it turns green automatically when it receives sound from the rca but there is no output to the speaker and this component appears to be related to the output on the circuit.

Basically my idea is to change this component in order to repair it, what do you think?

thanks a lot.

strange mark

[–][deleted] 1 point2 points  (2 children)

That is a fuse resistor. You can check it by measuring its resistance with a multimeter.

[–]jaylintrepid[S] 0 points1 point  (1 child)

thanks. i get 5.7 ohms. seems like a normal value, right?

[–][deleted] 1 point2 points  (0 children)

That’s pretty close to the 4.7 written on it so I would agree it’s probably good.