Try to fix my sub but got stuck. Advice? - Page 3

TheGimp · 10th January 2012, 04:28 PM

If that voltage is when it is disconnected from the amp, then it is normal. The adapter has a high output resistance, which when under load drops the voltage down to the specified 18VDC.

If that measurement is with the amp connected and running, then it is probably too high.

flux55 · 10th January 2012, 11:19 PM

Thanks Gimp. That was a no-load reading from the power supply. I'll check that off the list of possible causing problems. Will now focus on those capacitors as the probable problem.

nigelwright7557 · 11th January 2012, 10:08 PM

Be careful if you fix your amp before checking the speaker.
Sometimes a blown amp will fry the voice coil.
Then applying power from your fixed amp will blow it again !

flux55 · 12th January 2012, 07:08 AM

Thanks Nigel for this extra warning. I'll compare the Ω readings of each speaker and check for shorts.

flux55 · 3rd February 2012, 12:31 AM

Thanks to PSHITNIS I fixed this problem for ~$5. First I like to say I know very little regarding electronics. But I'm good at following instructions. Ordered those capacitors from ebay. Over 3-weeks shipping time from Hong Kong. I'm on a tight budget, so this was worthwhile. Kudos to pshitnis.

11th January 2012, 10:08 PM	#23
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	Be careful if you fix your amp before checking the speaker. Sometimes a blown amp will fry the voice coil. Then applying power from your fixed amp will blow it again ! __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

3rd February 2012, 12:31 AM	#25
flux55 diyAudio Member Join Date: Jan 2012	Overheating & Hum FIXED Thanks to PSHITNIS I fixed this problem for ~$5. First I like to say I know very little regarding electronics. But I'm good at following instructions. Ordered those capacitors from ebay. Over 3-weeks shipping time from Hong Kong. I'm on a tight budget, so this was worthwhile. Kudos to pshitnis.

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10th January 2012, 04:28 PM	#21
TheGimp diyAudio Member Join Date: Aug 2009 Location: Johnson City, TN	If that voltage is when it is disconnected from the amp, then it is normal. The adapter has a high output resistance, which when under load drops the voltage down to the specified 18VDC. If that measurement is with the amp connected and running, then it is probably too high.

10th January 2012, 11:19 PM	#22
flux55 diyAudio Member Join Date: Jan 2012	Thanks Gimp. That was a no-load reading from the power supply. I'll check that off the list of possible causing problems. Will now focus on those capacitors as the probable problem.

12th January 2012, 07:08 AM	#24
flux55 diyAudio Member Join Date: Jan 2012	Thanks Nigel for this extra warning. I'll compare the Ω readings of each speaker and check for shorts.

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