Wondering if anyone has a schematic for the 1000 version of this amp. When I first got this amp, it would blow the external fuse immediately. I replaced the mosfets which I found were faulty and the SMPS ic chip. The fuse no longer blows. I have it in series with a lightbulb to save myself from hopefully frying anything else. I also replaced the bigger electrolytics. When I play at louder volumes or hit lower notes, the amp seems to overload. The pilot light starts flickering and seems like it's about to pop a fuse but the light bulb in series with the amp takes the load and then amp sound returns. Im so lost on this, any luck repairing these out there?
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Orange Bass Terror 1000 power supply issues
- Thread starter ThunderNuts
- Start date
- Feb 12, 2006
- 60,985
- 5
- 220,767
- Disclosures
- Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
Have you investigated the voltages and the waveforms?
Do you have adequate knowledge of the necessary safety precautions to work on an SMPS?
Do you have adequate knowledge of the necessary safety precautions to work on an SMPS?
I have some knowledge. I usually just work on tube amps. I only have slight knowledge on SMPS. I do not have an oscilloscope unfortunately yet. The Voltages on the secondary side of the transformer at the taps are fine. Seems like the harder I pluck right before the sound wants to cut off, the voltages go way down. I also found something on the orange forums from 2014. they were talking about a 16pin amp driver chip IRS2092 being an issue. I'm not familiar in testing those. The DIP version no longer available only SMD. Found a SOIC to DIP adapter (DigiKey PA0006) I'm gonna try that next. if anybody can shed some light. I can read schematics and have meters. i have no signal generator or oscilloscope
- Feb 12, 2006
- 60,985
- 5
- 220,767
- Disclosures
- Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
Without the most basic of tools and experience, all you are doing is guessing. Good luck, and don’t get hurt.
I know. Unfortunately it's my only option at this point. Just toss a few parts at it with hopes I get something right. Checked the caps with a ESR meter and most were in spec. I replaced the ones that weren't. Next part to get whipped at this thing is that pair of IRS2092s 
I've had my eye on some oscilloscopes. I'm going to have to just bite the bullet soon and get one
I've had my eye on some oscilloscopes. I'm going to have to just bite the bullet soon and get one
- Feb 12, 2006
- 60,985
- 5
- 220,767
- Disclosures
- Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
Hint... it's NOT the caps regardless of what your ESR tester (and popular folklore) might suggest. It's almost never the caps.
