Resistance Checks [resolved]

[thoven0215]

I also notice that the left side of the leds on the pcb did not light up if that helps at all.

[Paul Birkeland]

OK, so the measurements on everything didn't go to 0V

You'll need to do a whole voltage check and just let us know which terminals are 0V.

[thoven0215]

Terminals 1, 2, 6, 7, 21, 22, 24, 25, 27 all shouldn't measure at 0 but measure at 0. I also measured 41-45 and 41 comes at 0 as well.

[Paul Birkeland]

Does 34 provide a proper measurement? How about 30?

[thoven0215]

30 measures at 425, which is about 7% more than the 398 listed. I just attempted to measure 34, and the same pop happened. I just turned off the amp.

[Paul Birkeland]

I would look for loose components around 34.  In the original photos you posted, 35L doesn't look to be well soldered, and those wires moving around could make a pop.

[thoven0215]

I soldered them again, and now I think the pop has taken out the right side too. 19 and 20 measure at 3 volts. 31 measures at 450. 34 measures at 3 volts. 36, 37, 39, 40 all measure at fractions of a volt. 41 measures at 0. 42 measures at 225. 43 measures at 0. 44 measures at 450. 45 measures at 223. Everything else measures at 0.

[Paul Birkeland]

Loose and/or damaged 130 ohm resistors and/or loose black wires leaving the 41-45 terminal strip will do this.  Did you go through the amp and wrap all the connections and resolder them?

[thoven0215]

I did, and how can I tell if the resistors are damaged? The resistors are not loose, and I just reflowed the terminals 41-45 again just to make sure nothing is out of order.

[Paul Birkeland]

I did, and how can I tell if the resistors are damaged? The resistors are not loose, and I just reflowed the terminals 41-45 again just to make sure nothing is out of order.

You have the correct voltages on 41-45, so I would suggest leaving those alone for now.  A damaged resistor will measure OL with the amp off and discharged if you try to use your meter to measure it.

[thoven0215]

I attempted measuring them, and both of the 130 ohm resistors measure at infinity.

[Paul Birkeland]

You can unsolder one end of each and double check them with one end poking up and not connected to anything.  Most meters will measure these in circuit, but some will not.

[thoven0215]

I disconnected them and measured again, but their value just keeps going up until my multimeter can't measure them anymore.

[Paul Birkeland]

OK, they are probably blown and need to be replaced. 

When you get them replaced, you can tape over the metal tip of your red meter probe so only the metal point sticks out, and that should help avoid potentially shorting a terminal with 400V on it to a terminal with 0V on it next door.

[thoven0215]

Just out of curiostiy, is it possible that it could have also been a power transformer issue? Further, I was using alligator clips to measure, and I thought I made sure to not touch other terminals. Could there be an alternate reason for them shorting when I test the terminal? Also where would you recommend me buy resistors? Nevertheless, thank you very much for your help Mr. Birkeland. I will update once I get the resistors.