MEDIC ...replace output transistor pl400 had problem on DBT

laatsch55

laatsch55

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Sitting out on the porch. 85 degrees and no wind. A cold Rolling Rock on the table.....watching basketball...
 
Northwinds

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laatsch55 said:
Sitting out on the porch. 85 degrees and no wind. A cold Rolling Rock on the table.....watching basketball...
Click to expand...
A well deserved break, you going to visit Perry also?

Looks like the Nor'easter is missing us thank goodness, maybe 1-3" of snow (crosses fingers)
 
laatsch55

laatsch55

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Don't know. Gonna see stuwee and Steve for sure...switched to a Redd Apple Ale....
 
Northwinds

Northwinds

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laatsch55 said:
Don't know. Gonna see stuwee and Steve for sure...switched to a Redd Apple Ale....
Click to expand...
Never tried that shit but I am very familiar with real hard cider. That shit is delicious. My grandmother used to serve that with dinner when I was a kid LMAO!!!
 
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changdangnz

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Thank dennis and lee , thak alot for your time to help me . Some output driver gone . 2 of themso i need to get from mouser again . Maybe i order more for spare.
 
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changdangnz

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Replace a spare driver ouput transistor . Check all pcb transistor is all good . Do a DBT 1 more time still short circuit some where. Maybe 8 gave up to fix this and going with WOPL. Better than think it out what is going wrong
 
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changdangnz

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I should not replace a fuse and turn on power again before it is get worst like this case. Too late to think about it but good lesson for me to learn on this life .
 
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changdangnz

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just update a few photo on my PL400 blow fuse amp . I had replace all output transistor and fuse . I make a measuring on filter capacitor is not right number value to me. I check a dc offset and it is not right as well. and out put measure is 1 channel is high than 50v and 1 channel is less. I just attach some photo and need expert to help me out. THIS MEASURE IS DOING UNDER DIM BULB TEST , and I can see the bulb is just a little dim. I know it is was short circuit some where on PCB but I can not find out
 

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