Blown orion Amp, Can I fix it????? - diyAudio
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Old 18th June 2004, 03:17 AM   #1
Satern is offline Satern  United States
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Unhappy Blown orion Amp, Can I fix it?????

I have an Orion 2150GX. It was working great but the speaker wire came off the box and touched. The amp began to smoke. I took it aprt and found 3 burnt transisters, Motorola 2N6488. Also there are 2 16V 3300uf(m) capacitors, and 4 50V 3300uf capacitors. Can I change these and be ok?? Yes Im a rookie at electronics, Thanks for any help.
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Old 18th June 2004, 12:59 PM   #2
Bull is offline Bull  United Kingdom
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LOL that must be one crap amp;as it has no protection whatsoever.
Mostly all amps have a relay against short circuit and all have a fuse on the output stage.But i guess yours is very cheap or very old that would explain for no protection circuit.

But I suggest you first, fit a relay on the just before the output stage on each channel and then replace all the transistors.
As a few blown transistors can put stess on the others and make the faulty;so thats why u replace them all.
Also the driver IC or transistor needs replacing too,as that usually goes faulty too.
Yes is the capacitors are damaged replace them with the identical value.

As your a rookie at electronics,I think you should use some tweezers as a heat shunt to hold the transistor when u are soldering.As too much heat kill the transistor.

Hope this helps.

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Old 18th June 2004, 01:13 PM   #3
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Thats amps a dead duck, so try the repair, you maybe a rookie but you know whats burnt out, the repair is not hard, the fault finding can be!
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Old 18th June 2004, 02:09 PM   #4
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Satern wrote:

Quote:
It was working great but the speaker wire came off the box and touched.
Replace the output transistors, and you should be fine. Common failure mode for shorting a GX series amp. Typically, nothing else needs replacing. YMMV

Bull wrote:

Quote:
LOL that must be one crap amp;as it has no protection whatsoever
Actually, it's a seriously good amp. IIRC, sold for about $750 new in 1990. Completely unregulated supply with enough current avaible for a small village. Just don't short the outputs, or you'll be replacing transistors.

Tim
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Old 18th June 2004, 03:04 PM   #5
cm961 is offline cm961  Canada
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Coincidentaly I'm repairing an Orion amp as well. I can't figure it out yet. The supply rails are very low, about +/- 9.5V. I think that might be ok though as the amp is supposed to be .25 ohm stable, so its meant to be loaded down to make power.

Mine has output but distorts (huge clipping). Perhaps its a blown output transistor. I was debugging the power supply initially because of the low rails and some instabilities. And then I switched to the input stage because I traced the signal to be distorting on the one op amp (NE5532). Is it possible that the op amp (its the closest one to the output stage) is for feedback or something and thats why its distorted? Or is that op amp for sure part of the input stage, and therefore thats where the problem exists.

How can I test the output transistors in in circuit?

Pete
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Old 18th June 2004, 05:11 PM   #6
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Is your a mono or stereo amp? is its a stereo amp, i would suspect a fet, may not even be blow, but it could be on its way to silicon hell, check them all for consistancy? thats all i can think of?
Are orion amps made in the USA? or the far east?
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Old 18th June 2004, 06:37 PM   #7
cm961 is offline cm961  Canada
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I think they're US made. It's a stereo amp. Supposed to be 25Wx2 but can run high power into 0.25 ohm.

What technique do I use to check the FETs?

Is the +/- 9.5V power supply correct or is that too low?

Why would both channels exibit the same problem? (which is they both clip at about 5V peak to peak)

Pete
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Old 18th June 2004, 07:40 PM   #8
Satern is offline Satern  United States
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Wow this is awsome, thanks for all the replies. I am going to Radio Shack now and hopefully they have the transitors there. The Amp is made in the USA and is sounds very good and powerfull but no there is no protection. I will write back soon an my outcome, Thanks again.

Hey by the way I also have a Premier GM-X822. It is like new but for some reason when I power it up, the protection light just blinks?? Any ideas?? Thanks
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Old 19th June 2004, 05:30 AM   #9
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cm961 wrote:

Quote:
Coincidentaly I'm repairing an Orion amp as well. I can't figure it out yet. The supply rails are very low, about +/- 9.5V. I think that might be ok though as the amp is supposed to be .25 ohm stable, so its meant to be loaded down to make power.

(snip)

Mine has output but distorts (huge clipping). Perhaps its a blown output transistor.
225HCCA?
These early Orions used bipolar 2n6488/6491 pairs, and were fairly simple unregulated designs. Many came my way, and the only failure mode was toasted outputs. In fact, I still have several pairs of them.
Never had to open an HCCA up, but I always assumed they used the same devices as the GX's.
I'm really not much of a repair tech, and check transistors as Paradise_Ice suggests for consistency while in-circuit. R&L channels should be symmetrical. Input is buffered with op-amps and does not invert phase on one channel. IIRC, they use small transistors as pre-drivers.
The DIN input has phantom power rails of +/- 15V to power accessories. The GX's used 7815/7915's to filter this voltage off the main supply rails, so I'd expect at least that much voltage from the power supply. This can be visually confirmed by the presence of a 7815 and 7915.
The accessory rails are the outermost pins on the DIN jack, 180 apart. Start by checking for voltage there. If you get full voltage, the power supply is most likely OK, right?
Check the supply pins of the 5532, I would expect them to be at +/-15V if the phantom supply was that high. Logical?

It's 1:30AM, and there are still children running around the house. That's about all the logic I can muster right now...
Where's a cattleprod when you need one?

Paradise_Ice wrote:
Quote:
Is your a mono or stereo amp? is its a stereo amp, i would suspect a fet, may not even be blow, but it could be on its way to silicon hell, check them all for consistancy? thats all i can think of?
Are orion amps made in the USA? or the far east?
I don't think there are FET's inside.
Not only was this amp made in the USA, it's part of the crop that built the USA's reputation for making great car amps.

Tim
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Old 19th June 2004, 11:24 AM   #10
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These guys are right on the button, I am surprised this amp has not protection?, now about the 0.25 ohm load! no amp should have this kind of load placed on it! that is close to shorting the poor thing out, most people accept that the lower the ohms the higher the distortion figure, Trust me, I dare you to test any hifi amp, with 2 pairs of speakers and it will be louder and basser, but will lack the dynamics and attack it would have with just 1 pair on it, Have you ever tried a 0 to 60 dash in a car with a trailer attached to it? am sure it could do it! but would it be that fast or good for your car.

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