So i have 2 of these amps, Orion HCCA 5000.1D v1, each amp only had damaged FETs, 1st is repaired and running perfectly all new FETs, changed out all the FETs on 2nd but this amp’s Power Supply section is acting “weird” and not like my 1st. I couldn’t upload the 3 videos to here so here’s link to Imgur. My apologizes.
3rd video shows following:
top wave chan-1: Rectifier switching
Bottom wave Chan-2: PS FET gate switching
Switching starts normally, but soon as the waves build to full the switching “degrades” into what is on video, if I remove rectifiers the Power Supply will build as in video but will stay a square wave/not degrade. My other amp does not do this, it switches correctly. But amp does reproduce input signal at speaker output terminals (when output is switching; see 2nd/3rd video)
Maybe the 2 problems are related???
1st & 2nd videos show the output switching problem possibly related to gain knob? Output section will not start switching most of the time unless gain is at/near half. I’m going to try a replacing with a 3rd gain knob, as 2nd is doing same as 1st. When amp boots with output switching proper it idles at 6.25a and reproduces input signal at subwoofer, when amp is below half or less gain output section does not start switching and will not reproduce input signal at subwoofer
As it is now the only time the amp will not work is when output section will not switch, which seems to be gain knob related, but about to try a 3rd potentiometer.
I’ve never seen a power supply switch like this and I’ve never seen a gain knob do this to output section. Really throwing me for a loop.
3rd video shows following:
top wave chan-1: Rectifier switching
Bottom wave Chan-2: PS FET gate switching
Switching starts normally, but soon as the waves build to full the switching “degrades” into what is on video, if I remove rectifiers the Power Supply will build as in video but will stay a square wave/not degrade. My other amp does not do this, it switches correctly. But amp does reproduce input signal at speaker output terminals (when output is switching; see 2nd/3rd video)
Maybe the 2 problems are related???
1st & 2nd videos show the output switching problem possibly related to gain knob? Output section will not start switching most of the time unless gain is at/near half. I’m going to try a replacing with a 3rd gain knob, as 2nd is doing same as 1st. When amp boots with output switching proper it idles at 6.25a and reproduces input signal at subwoofer, when amp is below half or less gain output section does not start switching and will not reproduce input signal at subwoofer
As it is now the only time the amp will not work is when output section will not switch, which seems to be gain knob related, but about to try a 3rd potentiometer.
I’ve never seen a power supply switch like this and I’ve never seen a gain knob do this to output section. Really throwing me for a loop.
Post photos (video is rarely useful).
Are you driving a signal into the amp when the amp won't produce rail-rail waveforms on the output transistors?
Are you driving a signal into the amp when the amp won't produce rail-rail waveforms on the output transistors?
I will remember only pics from now on. Ty.
Yes I am driving a 50Hz .5v sine wave into amp via RCA inputs.
1st problem: Each Output section will start switching at minimum gain with the other section’s riser card removed, but when both output riser cards are installed output will only begin switching when gain is at 50%+ Ive tried different cards, FETs, etc and no change at all.
2nd problem: (related to output problem somehow?) the waveforms on the power supply section are “wonky” when rectifiers are installed the ps waveforms start to build, then just before fully forming, cuts out, then comes back “wonky” as in pics. When rectifiers are not installed power supply builds waves as normal and stays fully built once waveform is generated, looking as perfect as square waves can. These “wonky” waves at rectifiers outter legs (PS FETs gate/drain are also effected, looking similar) seem to not be effected by output sections cards/FETs and wether they are installed or not. Only time waves clean up is when rectifiers are not installed
Yes I am driving a 50Hz .5v sine wave into amp via RCA inputs.
1st problem: Each Output section will start switching at minimum gain with the other section’s riser card removed, but when both output riser cards are installed output will only begin switching when gain is at 50%+ Ive tried different cards, FETs, etc and no change at all.
2nd problem: (related to output problem somehow?) the waveforms on the power supply section are “wonky” when rectifiers are installed the ps waveforms start to build, then just before fully forming, cuts out, then comes back “wonky” as in pics. When rectifiers are not installed power supply builds waves as normal and stays fully built once waveform is generated, looking as perfect as square waves can. These “wonky” waves at rectifiers outter legs (PS FETs gate/drain are also effected, looking similar) seem to not be effected by output sections cards/FETs and wether they are installed or not. Only time waves clean up is when rectifiers are not installed
Attachments
These are the waves, at gate, drain of PS FETs and rectifiers outter leg pads on each side when rectifiers are not installed
Weird part is, when gain is at 50%+ and everything populated and switching, amp works, even with these “wonky” waves as in picture of previous post, reproducing the input signal at speaker terminals.
Weird part is, when gain is at 50%+ and everything populated and switching, amp works, even with these “wonky” waves as in picture of previous post, reproducing the input signal at speaker terminals.
Attachments
Also, which I just had happen and noticed when trying a different output middle riser card, the amp began idling at 6.5a (last 5k idles at 7a when running normal) vs the 6a it usually does, with rectifier waves looking more “normal” as in this pic.
May just be a fluke, cuz I don’t remember in my last round of troubleshooting any of the outout sections components, wether installed or not, having any effect on the PS waveforms
May just be a fluke, cuz I don’t remember in my last round of troubleshooting any of the outout sections components, wether installed or not, having any effect on the PS waveforms
Attachments
It looks like they're using regulation for the rail voltage. If you reduce the voltage on your 12v DC power supply, the waveforms will likely be closer to what you expect.
If you watch the drive pulses from the PS driver IC, you will see a reduction of pulse width when the waveform goes to what you show on your scope.
If you watch the drive pulses from the PS driver IC, you will see a reduction of pulse width when the waveform goes to what you show on your scope.
O wow, ok, I will try that, ty so much for any direction on this, I’ve never seen this before and the other 5000.1D v1 I just repaired did not do this at all.
Could this be effecting the output section in anyway? I’ve also never seen an amps output section only begin switching when gain was at 50%+
Could this be effecting the output section in anyway? I’ve also never seen an amps output section only begin switching when gain was at 50%+
Is it the gain pot that's the problem or is it the signal level?
Don't use the gain pot to adjust the level. Set it to the maximum gain and adjust the level with the signal source.
Don't use the gain pot to adjust the level. Set it to the maximum gain and adjust the level with the signal source.
yes, you were spot on, anything at or below 13v is what I’m used to the waveforms looking like as “proper” ty!
And I had my waveform generator @ .5v, I set it to1v and it would start switching at below the 1/2+ it used to have to be ar, with a load/subwoofer connected the speaker terminals the amp starts switching even at minimum gain.
She’s buttoned back up and ready to run, ty Perry 🙂
And I had my waveform generator @ .5v, I set it to1v and it would start switching at below the 1/2+ it used to have to be ar, with a load/subwoofer connected the speaker terminals the amp starts switching even at minimum gain.
She’s buttoned back up and ready to run, ty Perry 🙂