Question about Denon AVR-1802 Receiver
I had a Denon 1802 AV receiver and it went intoprotection mode a week ago. I went all over the web looking for fixes.All of your posts on problems like this were the most helpful. I waswondering if you could guide me a little.
I have taken the unitapart and isolated the faulty IC using a DMM. It is the one closest tothe back of the unit and has D2390 stamped on it. On the PCB board thenumbers read 2SD2389 and Q101SL. I looked all over for a service manualwith no luck but I don't think I'll need it.
I was wondering where to go from here...
Where to puchase a new IC?
I have decent soldering skills and don't think that'll be an issue.
Is there anything else to check for?
Any help and information is appreciated!
First of all the part is a transistor not an IC. There should be at least 4 of these on the back, two of which will be marked D2390. The other should be marked Bxxxx. If the leads of the one you removed read 0 ohms, then it is shorted and must be replaced. You should also replace the 2SB compliment as well.
Before replacing them, completely remove all 4 and mark their locations. Turn on the unit and see if the protection message goes away. Hopefully it will. If it does, carefully measure using the DC voltage setting on the meter the 3 pads for each of the two transistors on the bad side. The readings should be something like 0,+/-40, and +/- 0.6V. If not, please post the readings here and we'll move onto the next step. Otherwise, replace the trnasistors with new ones and you should be OK.
Posted on Feb 07, 2009
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