Prob with avalon U5

gaetan · Post by **gaetan** » 24 Dec 2021, 01:01

hello thank you for the addition, I have a problem with my avalon U5, there
is an R83 resistor which burned when connecting it this morning, I do not
know what the value is I can send a photo too, because I do not know not if
my request is send to the right place. thanks for your help gaetan

I am also looking for the values of R84 and R67,
is the circuit available thank you

mauman · Post by **mauman** » 24 Dec 2021, 02:16

According to the pictures in this thread, both R83 and R84 are 10 ohm, 1% tolerance (brown-black-black-gold-brown). viewtopic.php?t=3273&start=20
In your picture, R67 is ambiguous, it could be 1.5k (brown-green-black-brown-brown) or 15k (brown-green-black-red-brown), both 1% tolerance.

If R83 burned, you should look for the reason before you replace it, or it will happen again.

gaetan · Post by **gaetan** » 24 Dec 2021, 15:44

hello thank you for the info, it is bizard because I had nothing to connect to the avalon, I had just connected only the 120V, and the resistor burned, however I had used it a few days before without problem knowing you , what is the function of this section, thank you and merry christmas

mauman · Post by **mauman** » 24 Dec 2021, 16:30

I don't have a schematic for this. But according to the other thread that I linked, other users have found bad capacitors in the power section. The high-power resistors nearby like R80, and the 2200 uF capacitors in the photo suggest this is a power section. If it is, and if a filter capacitor has failed and shorted to ground, that could easily burn a 10 ohm 1/4 watt resistor.