Amp came in with blown power supply fets .
I replaced the fets and driver ic’s (IR4427)
Amp will not power up I get no voltage or drive signals on the gate legs .
Any ideas ?
I replaced the fets and driver ic’s (IR4427)
Amp will not power up I get no voltage or drive signals on the gate legs .
Any ideas ?
Attachments
Transistor marked BR - 2SC2412K
Transistor marked FR - 2sa1037ak
The following site gives the part number from markings:
Marking smd
I use the MMBTA06 and MMBTA56 for PS drivers.
Transistor marked FR - 2sa1037ak
The following site gives the part number from markings:
Marking smd
I use the MMBTA06 and MMBTA56 for PS drivers.
I use MMBT3904 and MMBT3906 for the drivers. This looks like a S&I type design. If pin 1 is higher than pin 2 on the 494, then you need to check the LM293, pin 7 and pin 1, one of those will be high going through diodes to pin 1. If its pin 1on the LM293, that come in from the pin 11 of the power supply board header, to pin 3 of the LM293, its part of the output protection. If its from pin 7, that is from pin 10 of the header, and is thermal protection to pin 6 of the LM293.
Fair warning, I am no expert, just a goober.
Damon
Fair warning, I am no expert, just a goober.
Damon
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