Check them with the meter on resistance. Check them leg 1-2, 1-3 and 2-3.
Do any read near 0 ohms in any configuration?
The display panel doesn't need to be connected. Make sure that the rail caps are fully discharged before plugging that board back in (when the repair is done).
Do any read near 0 ohms in any configuration?
The display panel doesn't need to be connected. Make sure that the rail caps are fully discharged before plugging that board back in (when the repair is done).
Yeah I thought I read it can burn out resisters and more...I'm gonna check it but I might have already plugged it in like a dumbass last week then I read the thread you replied in so yeah..
Check the rectifiers that you pulled.
When you test with the battery, you need to have all heatsink mounted components tightly clamped to the heatsink when power is applied.
When you test with the battery, you need to have all heatsink mounted components tightly clamped to the heatsink when power is applied.
I do and have .what about the bottom plate the board actually screws to? Cuz I haven't had that on. I didn't think that would matter. Rectifiers are good...but I threw away the old rectifiers that I originally replaced..what if they were bad? I tested the amp and battery only drops from 12.6 to ll.8 then protect. What can set the amp into protect.. too much current? To low voltage ? I will check for more short circuits and if you could possibly post the protect circuit schematic. that would be cool.if you have it..
Yup zero resistance well that answered that question. Now this is beginning to look hopeless...what are all the possibilities that could trip protect...should I just remove all fets from the board just for the hell of it...?or with there being no direct shorts it's pointless..
Just for certainty I will read through every post and triple check everything cuz this is making me scratch my head
Without the rectifiers, I think the under/over voltage and the thermal protection would be the most likely to cause the amp to go into protect.
When in protect, post the DC voltage on all terminals of the two LM339 comparators on the PS driver board. Copy and paste the following list and fill in the blanks.
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
When in protect, post the DC voltage on all terminals of the two LM339 comparators on the PS driver board. Copy and paste the following list and fill in the blanks.
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
U101
Pin 1:0.05v
Pin 2:0.08v
Pin 3:11.77v
Pin 4:1.6-2.5v resets in half time
Pin 5:1.34v
Pin 6:2.46v
Pin 7:1.66v
Pin 14:0.60v
Pin 13:0v
Pin 12:0v
Pin 11:0v
Pin 10:0.31v
Pin 9:2.18v
Pin 8:4.17v
Note Pin numbers are swapped I labeled them wrong and was too lazy to fix sorry
Pin 1:0.05v
Pin 2:0.08v
Pin 3:11.77v
Pin 4:1.6-2.5v resets in half time
Pin 5:1.34v
Pin 6:2.46v
Pin 7:1.66v
Pin 14:0.60v
Pin 13:0v
Pin 12:0v
Pin 11:0v
Pin 10:0.31v
Pin 9:2.18v
Pin 8:4.17v
Note Pin numbers are swapped I labeled them wrong and was too lazy to fix sorry
Last edited:
U102
Pin 1:0.08v
Pin 2:0.51v
Pin 3:11.78v
Pin 4:0.22v
Pin 5:1.97v
Pin 6:2.5v-1.25v resets half speed
Pin 7:1.34v
Pin 14:2.61v
Pin 13:2.61v
Pin 12:0v
Pin 11:7.18v
Pin 10:4.97v
Pin 9:4.972
Pin 8:3.79v
Pin 1:0.08v
Pin 2:0.51v
Pin 3:11.78v
Pin 4:0.22v
Pin 5:1.97v
Pin 6:2.5v-1.25v resets half speed
Pin 7:1.34v
Pin 14:2.61v
Pin 13:2.61v
Pin 12:0v
Pin 11:7.18v
Pin 10:4.97v
Pin 9:4.972
Pin 8:3.79v
Why should those helping you, help you if you're too lazy to make things easier for them?
From the numbers you posted, it looks like U102 is defective. It's not definitive but likely from the information I have.
From the numbers you posted, it looks like U102 is defective. It's not definitive but likely from the information I have.
I didn't think that the data om the pin numbers would be an issue I was on a hurry ..I'm sorry I appreciate your time.. you have no idea how grateful I am. I will make sure from here forward I make it as easy as possible for you to work with me. My bad...and my occyliscope I thought wasn't functioning correctly because the horizontal line is bearly visible on the display... so I didn't see it... it must have been well used by the previous owner..I only like the digital lcd displays because they show the voltage peaks in digital format so you don't have to multiply the voltage by the divisions on the screen..even though doing so you understand the occyliscope a little better. It probably just comes natural to someone who uses one very often like yourself.. just so you know I am self taught on every thing I do.. and know and this is just adding to my bank of knowledge and thank you for sharing.im sure not too many people just pick this stuff up without any schooling of some sort..even less percentage of prople without even graduating highschool like myself and I have to thank you because it would be impossible if you didn't take time out of your day to teach.. are you getting your Data for checking the circuits from a service manual or just from a datasheet for the ic's themselves? If u have a service manual ..would u mind emailing it to me? alloyironmelteratgmaildotcom thanks in advance.
In the future, please break up large blocks of text. I have trouble reading without the breaks. If you can't decide where to break, after every sentence wouldn't be a problem for me.
You don't need the digital information. In MANY cases it's not accurate. Did you go to the page I linked to for the scope?
Rockford hadn't released the diagrams for this amp the last time I checked. Contact them to see if they will send you the diagram for this amp and all of the boards that go with it.
The circuit that looks like it has a bad comparator is highlighted in orange in the attached diagram. Rockford has been using that circuit forever so it's was easily recognized. It's on terminals 8-11 and 13, 14 on U102 in your amp.
You don't need the digital information. In MANY cases it's not accurate. Did you go to the page I linked to for the scope?
Rockford hadn't released the diagrams for this amp the last time I checked. Contact them to see if they will send you the diagram for this amp and all of the boards that go with it.
The circuit that looks like it has a bad comparator is highlighted in orange in the attached diagram. Rockford has been using that circuit forever so it's was easily recognized. It's on terminals 8-11 and 13, 14 on U102 in your amp.
do I have to fix the problem that is causing the comparator to fail?
Or am I just over thinking it. I just need to replace the quad comparator that failed, then continue?
I know it's probably easy to tell I never graduated highschool. I have terrible grammer and punctuation.
I just bunch my paragraphs together with a couple .....between where I think there should be a pause. Pretty bad huh?
I know, when I invent a time machine, I will go back to when I was young. Pay myself off, to not drop out of school. Limit my partying, At least till I'm out of collage. That would be the day...
Your awesome Perry thank you. How old are you if you don't mind me asking? Did you go to a tech school or anything?
The comparators sometimes randomly fail. There isn't really a load or input that damages them.
I had some Tech school but most of what I know (because you don't learn much of this in school) from doing the work for about 30 years.
I had some Tech school but most of what I know (because you don't learn much of this in school) from doing the work for about 30 years.
It's kinda sad how today there isn't many people who care to learn these fields.. I don't have any friends that do the things I do
I can rebuild any engine, transmission, tune them. mechanical, and or electronic. Basically rebuild anything. Literally. program arudinos, for random things, rebuild,rewind, repurpose electric motors, solder smd, I'm pretty tech savvy with all computer, android, electronics in general.. and very intricate. etc.
Weld in every process on every metal. **** I can put a roof on a house. Build in-ground swimming pools.
Wire anything from a house to a rv. Telephone lines. Security camera systems. Car remote starts. Fly helicopters, airplanes..
It's kinda boring being alone in my own world..no body I know can carry on a conversation about more than 1 of the skills I've listed and understand to carry on a conversation on ideas experiences etc... I am gonna become a teacher... ur a genius perry
thank you..
Thanks for listening.
I can rebuild any engine, transmission, tune them. mechanical, and or electronic. Basically rebuild anything. Literally. program arudinos, for random things, rebuild,rewind, repurpose electric motors, solder smd, I'm pretty tech savvy with all computer, android, electronics in general.. and very intricate. etc.
Weld in every process on every metal. **** I can put a roof on a house. Build in-ground swimming pools.
Wire anything from a house to a rv. Telephone lines. Security camera systems. Car remote starts. Fly helicopters, airplanes..
It's kinda boring being alone in my own world..no body I know can carry on a conversation about more than 1 of the skills I've listed and understand to carry on a conversation on ideas experiences etc... I am gonna become a teacher... ur a genius perry
thank you..
Thanks for listening.
So I replaced u102 lm339 and same result ...hmm should I retest voltages and repost?
Yes, repost the voltages you currently have.
Contact Rockford to see if you can get the diagrams for the amp.
Contact Rockford to see if you can get the diagrams for the amp.