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Servicing AKAI Active Surrond Speaker System Model SS803S
This system was brought to me with the complaint that it is dead and lying unused for a prolonged time. As usual, I opened up the set and subjected it to thorough cleaning and dismantled the boards one by one. The grill at the rear first, then the amplifier board with its heat zinc, which also has the power in board with fuse, input/output connections.
Then removed the front panel. Kindly have a view of the main board and also the inside of the box, where the transformer is fixed.
On observation, I noticed that one of the 4700mfd/35V cap is burst and its ESR reading is .24 instead of .05 and the 4A Fuses at the secondary AC input are blown (Fuse at primary was ok):
Just have a look at the dried flux on the boards (Input/output board, AC in board with Fuse)! The main board was also as bad as this, but forgot to click it!
Cleaned all the boards thoroughly using IPA and metal brush, repeating the process until the board was as clean as this:
As the boards had a lot of dry solder and the ESR readings of many of the Electrolytic Capacitors were out of range, I replaced all the capacitors on the board, which is my exciting amusement whenever I get a chance to do it! I replaced 41 Electrolytic Capacitors on the boards! Once again cleaned the boards and inter connected the boards keeping it outside. The set worked perfectly well! So, assembled the system back to its original shape (You can see that the LED is lit):
Here are the components that I replaced:
Another satisfying service accomplished!
This article was prepared for you by Parasuraman Subramanian from India. He is 66 years old and has more than 30 years’ experience in handling antiques equipment Valve Radio, Amps, Reel Tape Recorders and currently studying latest techs classes conduct by Kerala State Electronics Technicians’ Association. He was a BBA graduate, retired as MD of a USA company.
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You may check on his previous repair article below: