2. amps-preamps
  3. 141396-109166

Filter capacitor issue

I've been a member for over 10 years and have never posted anything on here so please bear with me. My main system is a Bedini BA-802 solid state amplifier, Music Hall Maverick SACD player, Magnepan MG2.6r speakers, Denon DP-59L turntable with Micro Acoustics MA-2002e cart but I have an issue with a Marantz 2220b receiver that hopefully someone on here can help me with. I bought the receiver with plans to do some simple upgrades ie: replace some caps, etc. and resell it. I When I changed out the large filter caps I inadvertently installed the cap for the left channel backwards. I put both negative terminals on the buss bar. The right channel cap is installed with negative on the buss bar and the left channel cap should have been installed with the positive terminal on the buss bar. Needless to say the left channel cap got angry and blew it's top. After realizing my error I put in a new cap correctly but now the main 2 amp fuse is blowing after about 20 seconds. I'm thinking I may have damaged the power transistors or smaller transistors on the main amp board. The service manual also says to check the thermistors on the amp board. I'm not an electronics tech but my brother is and has been teaching me some basics over the last few months. Unfortunately he's not here to help me out this week so if anyone has any insight into this it would be much appreciated. Thanks in advance, Eddie D.
skymunky57

Showing 5 responses by noromance

noromance's avatar
noromance
10,156 posts
 
As long as it’s not sold on to some poor schmuck, go for it.
While I am not taking a dig specifically at the OP, you can’t just pick up a service manual and fix electronics. It’s a disservice to those who have gone to school and taken exams and/or spent a lifetime honing their craft. Imagine your doctor doing the same thing? Or a pilot? Ebay et al are bringing out the fly-by-night element who are out of their league.
noromance's avatar
noromance
10,156 posts
 
Fair enough. However, the reason for my initial comment was that you stated that you plan to sell it on (with possibly botched handiwork.) If it was for your own use, maybe people would be less inclined to take a shot at you.
noromance's avatar
noromance
10,156 posts
 
Nope. First post showing you a psu which might get you out of a pickle.
Second post asking if it played - which could indicate transistors were okay. You may get away with replacing the rectifiers.
noromance's avatar
noromance
10,156 posts
 
In the 20 seconds before the fuse blows, can it play through the speakers?
noromance's avatar
noromance
10,156 posts
 
Note to self: Do not buy used gear from you. That said, there is a power supply board for sale on ebay for $26. 
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