I have a Rockford power 800a2 thatnis giving me a weird problem and repair a lot of these but this one is truly unique but I’m sure some will have a great idea of what to check.
Both channels were rebuilt and powersupply, new powersupply caps, new rcas, and new gains.
One channel required R364 (2R7) resistor replaced. The amp worked fine I benched tested it for 30 minutes under audio load bridged at 2ohm.
when I stopped playing audio and remove the speaker wires after about 5 or 10 minutes left channel had 6vdc on out slowly rising to 10vdc and right channel no dc voltage. If I just leave the rcas in and remove them the 2R7 resistor on right channels burns open. Initially during rebuild I replaced D3 also. Any ideas what could cause this scenario?
Both channels were rebuilt and powersupply, new powersupply caps, new rcas, and new gains.
One channel required R364 (2R7) resistor replaced. The amp worked fine I benched tested it for 30 minutes under audio load bridged at 2ohm.
when I stopped playing audio and remove the speaker wires after about 5 or 10 minutes left channel had 6vdc on out slowly rising to 10vdc and right channel no dc voltage. If I just leave the rcas in and remove them the 2R7 resistor on right channels burns open. Initially during rebuild I replaced D3 also. Any ideas what could cause this scenario?
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If the 2.7 ohm resistor is burning, either the series-connected capacitor is defective or it's oscillating,
Is the DC constant, at this point, or is it intermittent?
Is the DC constant, at this point, or is it intermittent?
Can you get the resistor to burn so you can check for oscillation? Or check/replace the capacitor.
Is the DC on the other channel constant or intermittent?
Is the DC on the other channel constant or intermittent?
At first there was jobs and bit was playing. But once stopped playing audio and let it sit idle fo 10 minutes and there was 1 dvc and the longer it was on the higher it went at 9vdc over 5 -10 minutes it slowly climbed
Hey Perry,
I replaced the 2.7ohm and caps in series and dc voltage slowly climbs, I don’t see the voltage on the preamp, I’m thinking I may have damaged the irf640 because I had to tin the bottoms, I ordered a whole new batch of irf640pbf fets. To install
I replaced the 2.7ohm and caps in series and dc voltage slowly climbs, I don’t see the voltage on the preamp, I’m thinking I may have damaged the irf640 because I had to tin the bottoms, I ordered a whole new batch of irf640pbf fets. To install
Disable the control for the biasing to see if the voltage climbs. If it's a leaky output, it should still produce DC. If not, the problem may be in the driver circuit or possibly contamination on the board.
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