Hi all, I have a faulty Octane R 9.0:5 on my workbench. R55 has burnt out and it's partner R54, Q17 and Q18 all show signs of heat. They all appear to be part of the output of the SMPS but past that I'm looking for a schematic or anyone's similar experiences as to the cause, otherwise I get to the t...

To be blunt, I can't think of anything worse than having ANOTHER of these amplifiers to blow up. Sorry. As soon as this is working it's getting the hell off my workbench and hopefully it can get me some funds for new substage amplifiers.

That's not a bad deal but if you notice, I'm in Australia, so postage is likely to double the cost - ironically that's how much this one owes me at the moment as well so I'm not keen to scrap it. Car audio costs a lot in Australia! Likewise, sending it overseas for repair is likely to land me in a s...

Hey guys, thanks for sticking with me on this one. It has been a while since I have worked on the amplifier. Tonight, I lifted the gate resistors on the output stage as it was easier as a prelim measure than removing all the fets, the problem remained as described earlier in the thread - current ove...

Thanks for that.

I am in a serious amount of bother with this amplifier, I can't afford to scrap it, no one in Australia will repair it, and no one in the world seems to know much about repairing it?

Hey guys, this amplifier is still dead and I'm lost for ideas. Does anyone have any more ideas?

No one's got any ideas? I'm sure it's not the only failed 1200.1 around here...

Bumpskies, Still desperately trying to fix this amplifier. It sounds too damn good!

Disconnected the inductors, but the problem remains as is.

Note that there is no protection circuit cutting in whatsoever. It just powers up, the relay clicks in, and it overloads my power supply...

49Kohms between outer pins on all eight devices.

Bumptacular...

Can anyone give me some insights? I am considering going for some new output transistors at this stage.

It's a slight possibility. But as the relay engages, by "spike", I mean a very rapid (50mS) ramp up to, well, however much current you give it, and it stays there until you power off.

In reply to questions here and elsewhere, here is some more info on this fault. There IS an insulating sheet on the underside of the amplifier's lid, rubbing is evident on the uppermost output filter inductor. I've hooked up the scope and the results I get are as follows. This is all prior to the sp...

I would have guessed a dead short as well, but running from a current-limited 12V supply, the power supply still has +/- 110 volt main rails, which couldn't be the case if there was a short. Re another person's question on another forum, resistance at the speaker terminals is 30K and rising, settlin...

cj10488, if you could help out at all with the fault I'm having with my 1200.1, detailed in the thread linked below, I would greatly appreciate it. It may be a similar problem to yours.

http://phoenixphorum.com/post166276.html#166276

I have a Phoenix Gold Xenon 1200.1 amplifier. I was using it at low volume (no, really, just background listening) at 4 ohms when it suddenly blew the fuse I was using (80A, underrated, but I was in the middle of upgrades.) It very badly overloaded the whole electrical system of the car when it happ...