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Hello there.
I have had two RCF325A, with the problem known as "replace all MMBTA42/92 transistors" and it works. Thank community for the info.
Unfortunately, one of them has +HV voltage on bass output rail. It seems that TL393 IC in error sense circuit is not working (I am waiting for the replacement, Mailman hurry up!!) because Error led is off, despite the irregularity.
Nevermind, I know that irregular conditions are present and, for now, I am ignoring that problem. The main problem is the presence +HV voltage on output rail despite the fact that every component in power supply is OK, including both FET IRF/IRFP.
Can you make me a suggestion, if you have any, based on your experience?
Thank you, in advance!
Slavisa, Bosnia
Ofc...here is the sch. https://goo.gl/images/sZnL3G
Additionaly, removing both fuses and measuring I have found +HV on the Q16's collector. Upper driving transistors are all ok.
Can someone describe functioning of the power circuit about power FETs, I am not quite sure how it works..?? Does it switch between hi and lo voltage on output transistors
I have had two RCF325A, with the problem known as "replace all MMBTA42/92 transistors" and it works. Thank community for the info.
Unfortunately, one of them has +HV voltage on bass output rail. It seems that TL393 IC in error sense circuit is not working (I am waiting for the replacement, Mailman hurry up!!) because Error led is off, despite the irregularity.
Nevermind, I know that irregular conditions are present and, for now, I am ignoring that problem. The main problem is the presence +HV voltage on output rail despite the fact that every component in power supply is OK, including both FET IRF/IRFP.
Can you make me a suggestion, if you have any, based on your experience?
Thank you, in advance!
Slavisa, Bosnia
Ofc...here is the sch. https://goo.gl/images/sZnL3G
Additionaly, removing both fuses and measuring I have found +HV on the Q16's collector. Upper driving transistors are all ok.
Can someone describe functioning of the power circuit about power FETs, I am not quite sure how it works..?? Does it switch between hi and lo voltage on output transistors
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