All of those Look OK.
I suspect that you'll still read ~12 ohms from one side of the transformer to the other but check anyway.
Do you have insulators under the rectifiers?
Clamp the FETs back down and power up the amp. It shouldn't have any problems operating without the rectifiers but watch for signs of trouble (components overheating...). With the amp powered up, do you have any DC voltage on the RCA shields?
If not, replace the ones for the negative rail (bottom as shown in your first photo) and power up the amp. Do you have any DC voltage on the RCA shields?
I suspect that you'll still read ~12 ohms from one side of the transformer to the other but check anyway.
Do you have insulators under the rectifiers?
Clamp the FETs back down and power up the amp. It shouldn't have any problems operating without the rectifiers but watch for signs of trouble (components overheating...). With the amp powered up, do you have any DC voltage on the RCA shields?
If not, replace the ones for the negative rail (bottom as shown in your first photo) and power up the amp. Do you have any DC voltage on the RCA shields?
okay so ive plugged in the amp without any of the rectifiers and i got 0.84v on the RCA sheilds. i have not tried with the negative rectifiers back in. should i do so? also my fan has stopped working for some reason :S could it be because of no rectifiers? thanks
just reinstalled the negative rail rectifiers and i was getting 1.5v on the RCA shields. Fan now works lol. thanks
oh cool, yea im not in any rush. i really appreciate your help perry, im learning alot aswell on the way. thank you 🙂
Hi perry, ill have to check them on the weekend as im back at university now so i will only get time to work on it at the weekend. hope thats cool
right with the rectifiers out and the digital meter set to 20m, Test 1 showed me "1" same as if the probes were open and Test 2 showed 13.05m ohms.
well when i originally tested them the digital meter was on the 200k setting not the 20m setting so it was 12k ohms. i had to use the 20m setting this time because the reading was too high to be read in the 200k setting.
Do any of the tabs of any of the outputs read anything near 0 ohms to the RCA shield ground, to the chassis ground or to any of the aluminum riser plates?
just to make sure, you want me to put the red probe onto a speaker output and the black probe onto the rca shields, chassic ground or the riser plates to see if the meter reads near 0ohms? sorry i didnt understand how you want me to test this? 🙂
Black probe on RCA shield ground, red probe on the tab of EVERY semiconductor with a metal tab. Does any read near 0 ohms? If so which one.
Black probe on chassis ground, red probe on the tab of EVERY semiconductor with a metal tab. Does any read near 0 ohms? If so which one.
Black probe on the aluminum riser plates (each one individually if they're not screwed tightly to the heatsink), red probe on the tab of EVERY semiconductor with a metal tab. Does any read near 0 ohms? If so which one.
Black probe on chassis ground, red probe on the tab of EVERY semiconductor with a metal tab. Does any read near 0 ohms? If so which one.
Black probe on the aluminum riser plates (each one individually if they're not screwed tightly to the heatsink), red probe on the tab of EVERY semiconductor with a metal tab. Does any read near 0 ohms? If so which one.
sorry for the delay. ive just carried out the 3 tests and i found that the output transistors D501,502,503,504,505,506,507,508 all showed 0ohms
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