Hi;
I guess this is one of those, "did this ever happen to you" situations.
I finished up a rebuild and dialed everything in and all was good, THEN, I decided to adjust the HV shutdown on the HV PCB. I slowly dialed the HV up and then around 23kV, R30 on the deflection PCB (10ohm0.25w) resistor released it's Magic Smoke!
I quickly tested a couple close transistors and replaced it. Dialed the HV back down to where is would be about 18.5kV and fired it up, (literately) and R30 went up instantly.
Two questions remain, one is why did this happen in the first place and two, what died to cause this to happen at such a low voltage the second time I fired it up?
I'll be studying the schems tonight but was wondering,
"Did this ever happen to you?"
Thanks
Jeff
I guess this is one of those, "did this ever happen to you" situations.
I finished up a rebuild and dialed everything in and all was good, THEN, I decided to adjust the HV shutdown on the HV PCB. I slowly dialed the HV up and then around 23kV, R30 on the deflection PCB (10ohm0.25w) resistor released it's Magic Smoke!
I quickly tested a couple close transistors and replaced it. Dialed the HV back down to where is would be about 18.5kV and fired it up, (literately) and R30 went up instantly.
Two questions remain, one is why did this happen in the first place and two, what died to cause this to happen at such a low voltage the second time I fired it up?
I'll be studying the schems tonight but was wondering,
"Did this ever happen to you?"
Thanks
Jeff

