I use two of the above power amps in bridged mono mode on my hi fi system, one recently refused to power up, on first inspection the two fuses rated at 8A had blown, I substitued the ones from my other amp and they blew straight away(under no load), the fuses are located next to a large torriodal transformer,has anyone any helpful pointers to fix my amp?.Thanks
It's most likely that the amp didn't like whatever load you were using while bridged, and the output transistors have blown.
They will be the devices attached to a large heatsink. Test these for shorts between collector-emitter. There may well be further damage other than these, and without knowlege of amplifier circuits and how they work it'll be tricky to repair - you may well just make things worse.
They will be the devices attached to a large heatsink. Test these for shorts between collector-emitter. There may well be further damage other than these, and without knowlege of amplifier circuits and how they work it'll be tricky to repair - you may well just make things worse.
scooter
Who In the hell is julia??
Ok so your instantlly blowing fuses.We need to locate the dead short.Unplug the unit from the mains power and remove the case. Look things over for obvious problems (burnt components etc.).If you have a schematic or a service manual that would be a big help. But the next best thing in a working second amp you can use it for referance.Look and see if you have more than one fuse inside the case. Does the rotel have BJT,FET's or chipamp output devices?
Dave
Who In the hell is julia??
Ok so your instantlly blowing fuses.We need to locate the dead short.Unplug the unit from the mains power and remove the case. Look things over for obvious problems (burnt components etc.).If you have a schematic or a service manual that would be a big help. But the next best thing in a working second amp you can use it for referance.Look and see if you have more than one fuse inside the case. Does the rotel have BJT,FET's or chipamp output devices?
Dave
I have schematics for a few Rotel amps (not that one, unfortunately) and they always seem to use a fully discrete topology.
scooter, what power BJT's are used in the unit? If they are shorted, you may have to replace the driver transistors also. If you're lucky (and both transistors died) everything else should be OK. You will need to adjust the bias on the channel that's had parts replaced though.
scooter, what power BJT's are used in the unit? If they are shorted, you may have to replace the driver transistors also. If you're lucky (and both transistors died) everything else should be OK. You will need to adjust the bias on the channel that's had parts replaced though.
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