problem with martin raptor fan.... |
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mk2_ginger_biscuit69
Old Croc Joined: 03 November 2008 Location: Brighton Status: Offline Points: 7801 |
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Posted: 21 September 2014 at 8:19pm |
so its a basic old fixture, but one unit has a broken fan.... is a pretty basic 12v DC high volume unit.
so went checking around with a multimeter [while comparing it too a working unit], got 15.5v on the PCB fan outlet, checked the fan on a 12v bench supply and that was fine, so checked the voltage at the fan which was only 1.5-2v, thus presumed a dodgy cable to the fan/connector. So i swapped that out, and still no joy. Swapped the entire fan assembly out of a working unit, and that didn't work. so what could be going on? Why am i getting the voltage i should, yet it simply refuses to work? Tried finding a 12v supply on the PCB to solder the fan onto but failed. ideas? |
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''Remember that the object of a subwoofer is to enhance the output of your main speakers, not overpower it''
''Dubstep - an elongated electronic fart'' |
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djeddie
Old Croc Joined: 26 April 2004 Location: Bristol Status: Offline Points: 4125 |
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Is there a dry joint in there somewhere? Not familiar with those internals, but sounds like it might be that. Or a broken/damaged cable somewhere.
The reason you're reading the correct voltage might be because the multimeter has a very high input impedance and therefore doesn't load the circuit in any way. The voltage might be there but the current isn't... if you see what I mean. |
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Chas n Dave : it's like Drum and Bass but with beards. E=mc² ±3dB
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mini-mad
Old Croc Joined: 13 July 2012 Location: london Status: Offline Points: 6903 |
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Is it on all the time or thermally controled? (Just asking)
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If it sounds like a gorilla is trying to escape, turn it down.
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mk2_ginger_biscuit69
Old Croc Joined: 03 November 2008 Location: Brighton Status: Offline Points: 7801 |
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ahhh good point! will have another bash at it tomorrow evening, this time i think im going to take it out and have a proper look around. The actual control PCB is only the size of a kingsize box of matches, with about 10 components... very simple design!! |
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''Remember that the object of a subwoofer is to enhance the output of your main speakers, not overpower it''
''Dubstep - an elongated electronic fart'' |
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mk2_ginger_biscuit69
Old Croc Joined: 03 November 2008 Location: Brighton Status: Offline Points: 7801 |
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well given up, and just soldered an external 12v PSU to the fan.... will try and fix it in a fortnight once i have some more time, im about to go sailing for a week, disembarking the night before the disco! But for now, its ran an hour problem free so that'll do for now!
Edited by mk2_ginger_biscuit69 - 23 September 2014 at 10:27pm |
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''Remember that the object of a subwoofer is to enhance the output of your main speakers, not overpower it''
''Dubstep - an elongated electronic fart'' |
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djeddie
Old Croc Joined: 26 April 2004 Location: Bristol Status: Offline Points: 4125 |
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Fair play Pat!
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Chas n Dave : it's like Drum and Bass but with beards. E=mc² ±3dB
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simonp1100
Young Croc Joined: 01 September 2008 Location: Bristol Status: Offline Points: 1103 |
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Check the main smoothing capacitor on the PCB board, could have dried out due to the heat.
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