Hello! I have RCF Art 310A and when I power it up the negative rail fuse blows up. When the fuse has blown up, the amp stays on, and +-LV and +-HV voltages look normal. Little under 40V and about 85V. So does anyone know what would cause the negative rail fuse to blow up?
Here is the schematic:
http://music-electronics-forum.com/...924-art310-art-series-base-amp-se515666a_.pdf
Here is the schematic:
http://music-electronics-forum.com/...924-art310-art-series-base-amp-se515666a_.pdf
We have the 312A and it failed inside the warrantee period and they just replaced the Mk2 amp module with a new Mk3 version. Could be a duff transistor, might be worth asking in Solid State for tips to identify and diagnose it. I have repaired amps with similar problems and that was typically the cause.
Do you mean 4A rated, FH4 fuse blows?
To begin with:
* disconnect the speaker
* build and use a lightbulb limiter
* turn amp on, measure DC voltage at speaker out terminals.
I bet you have a strong negative voltage there.
I suspect at least a shorted Q15 SAP16P which by the way is obsolete, out of production, and hard to find .... or EBay/China fake.
I suggest you get in contact with an RCF authorized Tech, or a local experienced one.
By the way, edit your profile to show where are you writing from, servicing suggestions depend strongly on that.
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