- Joined
- Jan 14, 2011
- Messages
- 75,612
- Location
- Gillette, Wyo.
- Tagline
- Halfbiass...Electron Herder and Backass Woof
How many ohms are you showing when you check the pico fuses?
WOPL 400 Build Problem!
- Thread starter nadude98
- Start date
nadude98
Journeyman
Dan, scared is good....! Just take your time.
- Joined
- Jan 14, 2011
- Messages
- 75,612
- Location
- Gillette, Wyo.
- Tagline
- Halfbiass...Electron Herder and Backass Woof
Call him Steely Dan...
nadude98
Journeyman
Blew the pico fuse on the B+ of the right channel. I tested all the outputs and they tested good. Whew......
- Joined
- Jan 14, 2011
- Messages
- 75,612
- Location
- Gillette, Wyo.
- Tagline
- Halfbiass...Electron Herder and Backass Woof
We asked that quite awhile ago, and you said you had checked them....so, all is well now??
nadude98
Journeyman
LMAO That's a good one!
nadude98
Journeyman
Nope, I had to take a time out.. just now getting back to it.
Checked VR1 that seems to be good as well as D80, by the TO-220 do you mean Q1?
nadude98
Journeyman
I might ask stupid questions.. I just want to make doubly sure I am doing this right!
nadude98
Journeyman
Rest of pico fuses are showing about 1-1.5 ohms
orange
Veteran and General Yakker
- Joined
- Jul 6, 2010
- Messages
- 17,704
- Tagline
- Broken beyond repair but highly affable
There are no stupid questions, only dumb moves from not asking.
nadude98
Journeyman
Checked Q1, it tested good...
nadude98
Journeyman
Nope, it's messed up..! Ordered new fuses.
here is a debug hint. You can tack solder a 10 ohm resistor across the Pico fuse to help you pinpoint your problem area. Locate and fix your problem and then once fixed, replace the fuse else you will just get frustrated blowing fuses. There is a reason the fuse blew
nadude98
Journeyman
okay, i'll do that. Thanks!
nadude98
Journeyman
Okay, here goes. When I tested the outputs at first, after blowing the pico fuse, I tried testing them using the ohms function and when I did that all the MJ21196's tested bad... When I did the diode test they tested ok. Well, I did as Joe suggested and tacked a 10ohm resistor in place of the pico fuse and am bringing up the amp with backplanes installed just like when a new install. I installed the bottom row of transistors and did a resistance check from output cases to chassis ground. The cases of the MJ21196's on both channels are measuring 2.8M ohms to ground....?
- Joined
- Jan 14, 2011
- Messages
- 75,612
- Location
- Gillette, Wyo.
- Tagline
- Halfbiass...Electron Herder and Backass Woof
That's good...
Danimal1969
Journeyman
- Joined
- Feb 4, 2016
- Messages
- 94
- Tagline
- ---
I can't in good consciousness call myself that. It's a bit presumptuous. Lol.
- Joined
- Jan 14, 2011
- Messages
- 75,612
- Location
- Gillette, Wyo.
- Tagline
- Halfbiass...Electron Herder and Backass Woof
Amen!! But we can....
Last edited:
nadude98
Journeyman
Ignore some of the last post... doh!
Okay, the back planes are reinstalled, with all outputs, and with a 10ohm resistor in place of the pico fuse. I'm am triple checking everything.... and from here I will not do anything but what you tell me to do.
Here is where I'm at.
What would you like me to do next... ?