So I got a friends 500/1 Rev.10, Power Supply blew up, literally, I pull the PS FETs, probe everything, all measuring good, so I reattach daughter board, test idle function and see PS is switching, so I install PS FETs, boot up, I see some switching on output FETs, probe terminals and see square wave in terminals? Weird, so I kill power. Reprobe everything …and see I didn’t put back the damn cardboard divider between the daughter card and POTs in main board 🤦🏼 (Didn’t see any reaction like sparks, etc and don’t even know if I actually did cause anything but assuming I did🙁 Amp idles at .5a with green LED only, but I have nothing going on in the output section now, the 4427 doesn’t even have a wave going into it, let alone out. I test my signal and check switches, all looks good, I probe RCA outputs and that isn’t getting a signal either . I’m pretty sure something is dead within the preamp on daughter board? Which I may have caused? Which is killing me right now, I VERY rarely cause more problems, I think this is like my 3rd time ever, and every time it hits so hard 🙁
Nothing seems to be dead (transistors, JFETs, the stuff you can probe with a multimeter. I’m such at a lose to know where to even start, and it’s a JL Audio bespoke design, but I’m guessing since RCA out isn’t getting a signal along with the 4427 getting nothing on the in pins as well should help point me in a direction? Any help would be amazing, I can’t believe I might have caused this, cuz I saw waves on the output when I first booted it …man what a dolt move.
Nothing seems to be dead (transistors, JFETs, the stuff you can probe with a multimeter. I’m such at a lose to know where to even start, and it’s a JL Audio bespoke design, but I’m guessing since RCA out isn’t getting a signal along with the 4427 getting nothing on the in pins as well should help point me in a direction? Any help would be amazing, I can’t believe I might have caused this, cuz I saw waves on the output when I first booted it …man what a dolt move.
Attachments
Do you have output pulses on pin 6 of the 555 timer near the op-amp where you bridged pins 1 and 2.