So I finally scored an “awesome to me” Orion amp pretty cheap, for my own personal use, which I’m really stoked about cuz I couldn’t/wouldn’t drop retail $$$ on it with my current budget 😅 and it only had 2 blown PS mosfets on last bank. It took a rough ride via USPS but nothing was damaged or came loose even, just a hard knock to main body and side panels bent to ****, which I already straightened out, it was like it was literally thrown while it was stuck in Indianapolis USPS for 4 days ...
So to start I removed all PowerSuppy & Output FETs and both Rectifiers, booted up to get an initial probing, booted right up pulling only .06 amps in idle, not in protect.
Square wave on each of the PowerSupply Gate @ 22khz.
I see no waves or voltage over 1v on any of the OutPut or Rectifier pads.
I see ?sawtooth/triangle? waves & square waves on the SG3525AP.
There’s 2x LM393 MICs to the right of the 3525, I see various voltages ranging from 1v-12v but no waves on each, the voltages are not the same on each pin, I have them written down.
The IR2110S on output riser card has pins 11&3 + 7&10 shorted off/on board, and shows barely a volt on each pin, same with the LM393 next to it, barely a volt on each pin and neither have any waves, of course right since nothing is getting proper voltage?
So I checked the pins leading up to output card (a set of 4 at each corner) none have over 1v on them, there looks to be a voltage regulator, IRFBC30 above the transformer that’s above the riser card with a heat sink attached to it, barely a volt on each leg.
I’m new to this amp/board/design, I don’t know how it exactly works, if it needs PowerSupply to be working to show signals/voltage on the output section or not or if it needs a signal via RCAs, etc. I have ordered the last 2 IRFP4868 @ Mouser (every other vendor in the USA seems to be out, even eBay) I wanted 8 new matched PS FETs but got 2 so I can at least test it with the other 6 that tested good and within similar spec, I also ordered 6 new matched IRFP1405 for the Output section even tho they tested good and are all within similar spec as there seemed to be some molten backs, getting worse from 1 to 6, with 6 actually having blackened TIM near it too, you can see how bad it is in pic, will not sit flat against heat sink now.
All the FETs had those MESHA type solder shims but none were soldered on, just TIM used. I have TO-247 size blue thermal pads and high quality TIM I can use instead if need be, but ya that’s the jist of it right now, worried there’s multiple damaged pieces from rough shipping ride and/or from PS blowout cuz so many of the same ICs have different readings, there’s like 5x TL027 as well that all read different diode check wise that don’t seem to be on same trace and/or same resistor. O thing else test bad diode wise. I may be posting this early as I don’t have the FETs to get the Power Supply section up and running yet to test section by section, I also don’t know if and what it needs PS/Output/Signal wise to even be able to test each section so hoping someone with Orion XTR experience can advise.
This is a “stay in my collection forever and run ‘til I finally get an HCCA” amp. I know that don’t really matter but I’m excited to get one in finally as Orion is my fav besides Alpine, hoping the repair isn’t crazy cuz I’ve heard that the output card/section can be a nightmare even for experienced techs ...so I’m def approaching this cautiously wanting to confirm working sections by sections before soldering in $30-$50 FET sets. Any help greatly appreciated, ty 🖖🏼
So to start I removed all PowerSuppy & Output FETs and both Rectifiers, booted up to get an initial probing, booted right up pulling only .06 amps in idle, not in protect.
Square wave on each of the PowerSupply Gate @ 22khz.
I see no waves or voltage over 1v on any of the OutPut or Rectifier pads.
I see ?sawtooth/triangle? waves & square waves on the SG3525AP.
There’s 2x LM393 MICs to the right of the 3525, I see various voltages ranging from 1v-12v but no waves on each, the voltages are not the same on each pin, I have them written down.
The IR2110S on output riser card has pins 11&3 + 7&10 shorted off/on board, and shows barely a volt on each pin, same with the LM393 next to it, barely a volt on each pin and neither have any waves, of course right since nothing is getting proper voltage?
So I checked the pins leading up to output card (a set of 4 at each corner) none have over 1v on them, there looks to be a voltage regulator, IRFBC30 above the transformer that’s above the riser card with a heat sink attached to it, barely a volt on each leg.
I’m new to this amp/board/design, I don’t know how it exactly works, if it needs PowerSupply to be working to show signals/voltage on the output section or not or if it needs a signal via RCAs, etc. I have ordered the last 2 IRFP4868 @ Mouser (every other vendor in the USA seems to be out, even eBay) I wanted 8 new matched PS FETs but got 2 so I can at least test it with the other 6 that tested good and within similar spec, I also ordered 6 new matched IRFP1405 for the Output section even tho they tested good and are all within similar spec as there seemed to be some molten backs, getting worse from 1 to 6, with 6 actually having blackened TIM near it too, you can see how bad it is in pic, will not sit flat against heat sink now.
All the FETs had those MESHA type solder shims but none were soldered on, just TIM used. I have TO-247 size blue thermal pads and high quality TIM I can use instead if need be, but ya that’s the jist of it right now, worried there’s multiple damaged pieces from rough shipping ride and/or from PS blowout cuz so many of the same ICs have different readings, there’s like 5x TL027 as well that all read different diode check wise that don’t seem to be on same trace and/or same resistor. O thing else test bad diode wise. I may be posting this early as I don’t have the FETs to get the Power Supply section up and running yet to test section by section, I also don’t know if and what it needs PS/Output/Signal wise to even be able to test each section so hoping someone with Orion XTR experience can advise.
This is a “stay in my collection forever and run ‘til I finally get an HCCA” amp. I know that don’t really matter but I’m excited to get one in finally as Orion is my fav besides Alpine, hoping the repair isn’t crazy cuz I’ve heard that the output card/section can be a nightmare even for experienced techs ...so I’m def approaching this cautiously wanting to confirm working sections by sections before soldering in $30-$50 FET sets. Any help greatly appreciated, ty 🖖🏼
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MIC?
TIM?
I'd suggest that you NEVER buy semiconductors from ebay or Amazon unless you know absolutely, for certain that they're selling first quality parts. There are a small number of honest sellers but FAR too many are selling counterfeit parts.
The 1405s are PS. The IRFP4868 are the outputs.
These typically aren't too difficult. Power Acoustik used the same basic design for many years and those rarely had oddball problems.
TIM?
I'd suggest that you NEVER buy semiconductors from ebay or Amazon unless you know absolutely, for certain that they're selling first quality parts. There are a small number of honest sellers but FAR too many are selling counterfeit parts.
The 1405s are PS. The IRFP4868 are the outputs.
These typically aren't too difficult. Power Acoustik used the same basic design for many years and those rarely had oddball problems.
My bad, I’m using acronyms I don’t know if are correct or not, MIC as in Micro Integrated Circuit, thought I saw someone use it before to describe a very small IC chip.
And I meant to type T.I.M. As in Thermal Interface Material.
I never buy from Amazon and usually don’t go through eBay, although I do have a very select few of sellers who were recommended who sell new, unused, matched if needed, chips. VERY FEW though. like 1 or 2 and still even they are used as last resort. Some of the horror stories I’ve heard about fake chips, etc won’t let me order randomly.
I ended up ordering from LCSC and got 8 of the last 15 IRFP4868’s. They came highly recommended and I just found out while buying they even accept PayPal Pay-in-4, which is a huge deal to my wallet lol.
That’s so great to hear cuz I’m really looking forward to working on this larger FET amp. I’ll report back once I get the power supply section up and running 🙂
And I meant to type T.I.M. As in Thermal Interface Material.
I never buy from Amazon and usually don’t go through eBay, although I do have a very select few of sellers who were recommended who sell new, unused, matched if needed, chips. VERY FEW though. like 1 or 2 and still even they are used as last resort. Some of the horror stories I’ve heard about fake chips, etc won’t let me order randomly.
I ended up ordering from LCSC and got 8 of the last 15 IRFP4868’s. They came highly recommended and I just found out while buying they even accept PayPal Pay-in-4, which is a huge deal to my wallet lol.
That’s so great to hear cuz I’m really looking forward to working on this larger FET amp. I’ll report back once I get the power supply section up and running 🙂
The op-amp is just an IC to me. I see nothing micro about it.
For TIM, that's a legitimate term but not often used here. As far as I'm concerned, 'insulator' is good enough.
Remember that all of the FETs in each bank need to have the same date code.
For TIM, that's a legitimate term but not often used here. As far as I'm concerned, 'insulator' is good enough.
Remember that all of the FETs in each bank need to have the same date code.
It’s all still micro to me bro lol 😅
ya I’ve heard it called so many different things, insulator is new to me though.
And ya I remember that being one of the first things I learned about replacing FETs and why. I should have the 2 new matched IRFP4868 in soon, I’ll compare to the other 6 I still have that test good to see if the 8 can be used for Initial testing/troubleshooting while the 8 matched set makes its way from LCSC. I just got in the 6 matched IRFP1405, although I planned on saving them for final install with the incoming 8 matched 4868. The original 6 I have test with +1.5uF more of capacitance vs the new I just got in, other specs match right up. I’ll update thread when the 2 new 4868 get in to proceed
ya I’ve heard it called so many different things, insulator is new to me though.
And ya I remember that being one of the first things I learned about replacing FETs and why. I should have the 2 new matched IRFP4868 in soon, I’ll compare to the other 6 I still have that test good to see if the 8 can be used for Initial testing/troubleshooting while the 8 matched set makes its way from LCSC. I just got in the 6 matched IRFP1405, although I planned on saving them for final install with the incoming 8 matched 4868. The original 6 I have test with +1.5uF more of capacitance vs the new I just got in, other specs match right up. I’ll update thread when the 2 new 4868 get in to proceed