8080DB Almost there.........

shelby1420

shelby1420

Enjoying the music.....
I have taken all the resistors out of the driver board, I have encountered a problem, now about a minute after I turn it on it goes into protection....it does come out of protection but quickly goes back into protection:sigh:.......I had a one point put the driver board in incorrectly and had a trace on the power supply board fry-- fixed that and replaced resistors on the driver board ( 2 180 ohm and 4 150 ohm resistors suggested to be replaced by CD Fixer still no love!!!:tears: Could it be possible I took at some transistors on the driver board and if so how do I check this, any help is appreciated!!!!:thmbsp:
 
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Echowars, Dr.audio, CDfixer

shelby1420 said:
I have taken all the resistors out of the driver board, I have encountered a problem, now about a minute after I turn it on it goes into protection....it does come out of protection but quickly goes back into protection:sigh:.......I had a one point put the driver board in incorrectly and had a trace on the power supply board fry-- fixed that and replaced resistors on the driver board ( 2 180 ohm and 4 150 ohm resistors suggested to be replaced by CD Fixer still no love!!!:tears: Could it be possible I took at some transistors on the driver board and if so how do I check this, any help is appreciated!!!!:thmbsp:
Click to expand...

Help!!!!!
 
I haven't worked on a 8080db or a 9090db in years. But if you had blown outputs (is there an original thread? This should have been appended to it) then there's a good chance that something on the driver board is blown as well. This thread can help with basic transistor checking.

Note that with the 9090db and 8080db, the input stage gets its ground reference from the input cable...if this cable is disconnected, the unit will briefly come out of protect mode on power up, but without a ground reference the input stage will quickly become unbalanced and the protect circuit will open the relay.
 
EchoWars said:
I haven't worked on a 8080db or a 9090db in years. But if you had blown outputs (is there an original thread? This should have been appended to it) then there's a good chance that something on the driver board is blown as well. This thread can help with basic transistor checking.

Note that with the 9090db and 8080db, the input stage gets its ground reference from the input cable...if this cable is disconnected, the unit will briefly come out of protect mode on power up, but without a ground reference the input stage will quickly become unbalanced and the protect circuit will open the relay.
Click to expand...

I will try to figure out what the transistors are on the driver board and if they are ok first, the second part scares the **** outta me as I have no clue what all that means............ really hope its a blown transistor on that driver board..............
 
EchoWars said:
Note that with the 9090db and 8080db, the input stage gets its ground reference from the input cable...if this cable is disconnected...
Click to expand...
What it means is that you can't power up the receiver with the driver board in place without connecting the input cable at the top of the board...this cable is what the input stage uses for a ground reference.
 
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