Question about Mackie SWA1501 Subwoofer

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Sw 1501 no sound output

Ive checked the fuses, boards inside for broken solder points etc... everything looks fine. lights power on and stay on, theres a slight pop sound heard when powering on and off, and a slight crackle sound when adjusting the gain knob on the sub itself. the thru ports work fine, and still transfer sound to the mains.

not sure how to test anything else, what should be checked next.

any thought/help much appreciated!!

thx

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The fuse may be located in several spots:

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- fuse mounted into a fuse holder soldered onto the circuit board - glass type fuse

- fuse soldered directly onto the circuit board - sometimes the type used is glass (it may have a heatshrink tube around it so it doesn't look like a fuse at a first glance, also there are other types of fuses that can be soldered directly onto the board - these are in the form of a small vertical cylinder, usually of a dark reddish colour with white / yellow print on the top - they look somewhat alike to small electrolytic capacitors, but are encased in dark red plastic with the pins located directly underneath the fuse.

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What are you using to feed the sub? Are you sure that the signal level you are presenting to the sub is the same?

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Speakers stopped working


If the speaker cable was pulled with a lot of force and at an angle to its connector, the most likely problem is a broken connection inside the wire. A visual inspection will not prove that problem but you can try connecting the speaker and wire to another output on the receiver. If the speaker and wire prove to be good then it's most likely that the solder point for that speaker output was broken on the circuit board.

Good Luck,
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May 16, 2009 | Panasonic Speakers & Subwoofers

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Mackie 1501 sub immediatley shuts down after powering up.


Hi There, There are 3 internal fuses to check that clip onto the main amp board. You can access them by undoing the two screws that are on the top and the bottom of the sub. They have flat large heads and you will need a hex key to unscrew them. If it is one of the fuses that has gone it will either be discoloured as in burnt or you will see the metal inside has split. Simply replace these with a new fuse and hey presto you should be back up and running. You might also want to check that none of the push on cable ends have dropped off fom the board as this may also stop connection going through. If you need any parts for the sub or fuses then www.LondonSpeakerShop.com will be able to supply them (that is if you're in the UK). Hope this helps. Grant (from www.LondonSpeakerHire.com)

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1 Answer

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T14 is part of the +15v power supply that feeds the input board.
It is actually a transistor.
If this is the only problem on the board, then this transistor could be resoldered back on but you will have to make sure it tests OK and it attaches to the heatsink the same way it came off. ie make sure it is electrically isolated from the heatsink
It seems if there is no fuses blown on the power amp board you might be one of the lucky ones.
In my opinion this amp is a clever design but is under-engineered for robustness

Aug 09, 2008 | Mackie SWA1501 Subwoofer

1 Answer

My Klipsch synergy subwoofer not working


No sound problem is power amplifier trouble maybe the IC there is defected or cold solder of joint of the parts.Cold solder issues - each component is soldered into small holes on the printed circuit board which in turn connects said component to the other components. Due to time, heat, use, some solder joints would be cracked or loose. It is possible that the cold solder is still minimally connected (hanging by a thread). When the receiver turns on heat would be generated which would be sufficient to further loosen up the solder joint to the point it no longer provides electrical contact. Jarring the unit creates movement inside enough to re establish the contact, sometime good enough sometimes not enough.

Again, since the unit still operates (sometimes) then it is highly probable that there are no defective components. As you have surmised, it is possibly a loose connection, solder joints are "connections" except that molten soldering lead is used to attach/connect the component to the board, "loose connection" in this sense is equal to "cold solder".

Again on the assumption of no defective parts, then seeking a more experienced buddy for the soldering might be to your advantage. This is of course in addition to the possible electrical hazards when repairing....

Good luck:

Don't forget to rate;

Jul 20, 2008 | Speakers & Subwoofers

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