Re: Av123 MFW-15 power supply problem
Bump
xXDigitizerXx
New Member
Last Activity: 03-20-2018, 02:09 PM
Joined: 02-24-2018
Location: Manitowoc, Wisconsin
-
Re: Av123 MFW-15 power supply problem
Well, installed the new fets, it turned on than 20 seconds of being on it started to have a high pitch hiss and popped the fuse, replaced the fuse and I'm back to instant popped fuses. Runs fine green light stays on, with fets removed..... Any ideas? :/
EDIT: even with the power switch in off position it blows a fuse when power is applied and the new fets are blown...Last edited by xXDigitizerXx; 03-01-2018, 02:10 PM.Leave a comment:
-
Re: Av123 MFW-15 power supply problem
I called them 807s for short, I tested them in my cheap ebay tester as well as with my multimeter one probe on the metal back than to each leg, getting a beep on all 3 and viceversa. the 2 that were wide open on all legs I tossed the other 2, like I mentioned I put back in 1 in each bank and turned it on and got the green light then pulled them back out and tossed those also, cause all 4 of them were from different batches and I ordered 4 new ones of the same batch. 7.99 for 4 and 7.99 for shipping. Orignally ordered from digikey...Last edited by xXDigitizerXx; 02-25-2018, 06:50 AM.Leave a comment:
-
Re: Av123 MFW-15 power supply problem
Thank you for your efforts. Replacement IR807P's will be here in2 days, hopefully after installed I don't fall victim to that hiss. I will be recapping all these boads while I wait for the 807s tho. Cheers...Leave a comment:
-
Re: Av123 MFW-15 power supply problem
So I ripped it all off the plate as you mentioned. Seen some browning on the fets so I check them with a multi meter and one on each bank tested OL, so I pulled them and 2 of 4 are completely wide open then I noticed all 4 are from different batches... So question is perhaps thats reason for fuses blowing? P.S. this glue is horrid.. lol since 2 of these are dead, I'll have to replace the driver transitors also? I don't have an oscope to test the driver waves, mine had a fight with a cup of coffee and lost the battle....Last edited by xXDigitizerXx; 02-25-2018, 12:28 AM.Leave a comment:
-
Re: Av123 MFW-15 power supply problem
2.765k on both when measured on my auto range multi meter on ohms.
On a side it doesn't blow fuses if I leave it unhooked like the pic I'll attach, but soon as I hook up the remaining boards fuse pops instantly.
Thanks for the help on this. Hope I don't make you pull your hair out. I'm kind of a noobie....Leave a comment:
-
Re: Av123 MFW-15 power supply problem
98nf 15ohm esr on c4 and 96nf 15 ohm on c5...Leave a comment:
-
Re: Av123 MFW-15 power supply problem
Ceramic discs are 104M 50v Y5u 1nf 20%.. your resisters in R1 and R2 are different colors than mine and they are the same boards. I can't tell for sure what the color bands are on mine either sucks....Last edited by xXDigitizerXx; 02-24-2018, 03:42 AM.Leave a comment:
-
Re: Av123 MFW-15 power supply problem
I am currently trying to repair this same amp.. mine is blowing fuses. I have r1 and r2 1 leg unsoldered to test, it's reading .692 on both r1 and r2. I removed D1 diode cause it was letting voltage go both ways ( I suspect thats what is popping fuses) the R1 on the other board you can see has a chip in it but reads out at .692 like the other one altho both them have different color bands......Leave a comment:
No activity results to display
Leave a comment: