Excellent video! Thanks for going through everything step by step. I have one of those Valhalla power analyzers, 2101. Every time I send it in for calibration it's good, so I keep using it. When you did your power measurement you had it on the 0.2 amp setting so thoroughly in the overcurrent on that analyzer around 46 mins. I've done that so many times, ha. Magic smoke escaped! This work would be so much easier if they released schematics for these things. Anyways, with the reaction module these things draw a lot of power so that power supply is under very heavy load. The one I repaired is still going in the lab. I think the resistor and relay are inrush current limiting to protect the PFC diode? Sometimes they put a second slower diode in parallel with the PFC diode and inductor to handle that but I don't remember if that is in place or not. I found the fans wouldn't run correctly without the reaction module installed.
Thank you!! I just left a comment on your video 😂 Really appreciate you taking the time to watch and comment. The reason I assumed the mechanical relay is for in-rush current from AC input is the fact that it switches on immediately; as soon as you apply mains, but before you flip the mains switch on. This is before the PFC circuit is engaged. But you could be right!! And yes I am beginning to think the fan control is related to lack of reaction module. Would have loved to had one on hand so I really could have put this thru a serious load test!
And yea the Valhalla 2101 is a great analyzer! Just watch out for those gang switches. When they get dirty, they start causing all kinds of strange fault symptoms!
Am repairing one the now (same pcb different part number) so you two's videos have been most helpful. The unit i have sometimes starts but always starts tripping on and off after a while. Am hoping it's the capacitors on the quiescent supply. I stripped them out and found 1 with very high ESR.
Seems like lightning strike type thing, really dont see how so much completely unrelated stuff broke for no good reson. Especially the I/O on the uC dying when all the circuit after it is ok.
@@hopper7755 could be! I'd love to troubleshoot it further but without the reaction module, it would be difficult to get additional clues on the state of the HC12 micro.
@@yanfishtwig2356 there isn't much overvoltage protection at the AC input. No MOVs. unless they are in the external EMI filtering module but usually that isn't the case
Not really knowing your systems; yet still interesting to watch you trouble shoot these board. Good job!
thanks Joel! Always appreciate you taking the time to watch and comment!
Excellent video! Thanks for going through everything step by step. I have one of those Valhalla power analyzers, 2101. Every time I send it in for calibration it's good, so I keep using it. When you did your power measurement you had it on the 0.2 amp setting so thoroughly in the overcurrent on that analyzer around 46 mins. I've done that so many times, ha.
Magic smoke escaped! This work would be so much easier if they released schematics for these things. Anyways, with the reaction module these things draw a lot of power so that power supply is under very heavy load. The one I repaired is still going in the lab. I think the resistor and relay are inrush current limiting to protect the PFC diode? Sometimes they put a second slower diode in parallel with the PFC diode and inductor to handle that but I don't remember if that is in place or not. I found the fans wouldn't run correctly without the reaction module installed.
Thank you!! I just left a comment on your video 😂 Really appreciate you taking the time to watch and comment. The reason I assumed the mechanical relay is for in-rush current from AC input is the fact that it switches on immediately; as soon as you apply mains, but before you flip the mains switch on. This is before the PFC circuit is engaged. But you could be right!! And yes I am beginning to think the fan control is related to lack of reaction module. Would have loved to had one on hand so I really could have put this thru a serious load test!
And yea the Valhalla 2101 is a great analyzer! Just watch out for those gang switches. When they get dirty, they start causing all kinds of strange fault symptoms!
Am repairing one the now (same pcb different part number) so you two's videos have been most helpful. The unit i have sometimes starts but always starts tripping on and off after a while. Am hoping it's the capacitors on the quiescent supply. I stripped them out and found 1 with very high ESR.
Seems like lightning strike type thing, really dont see how so much completely unrelated stuff broke for no good reson.
Especially the I/O on the uC dying when all the circuit after it is ok.
@@hopper7755 could be! I'd love to troubleshoot it further but without the reaction module, it would be difficult to get additional clues on the state of the HC12 micro.
i was wondering the same
@@yanfishtwig2356 there isn't much overvoltage protection at the AC input. No MOVs. unless they are in the external EMI filtering module but usually that isn't the case