Shorted Transistors And Blown Fuses Found In AKAI Tuner Amplifier
Model and make: Akai Stereo Receiver Model AA-1020
Complaint reported: Set dead.
Observation done: After opening and cleaning the inside thoroughly, when the board was checked, two fuses were found blown. Capacitors looked very old and dried out. Two transistors were found to be short. ESR readings of many capacitors were out of range.
Rectification done: After replacing the transistors, fuses and electrolytic capacitors in the power supply section, the set worked on trial switch on. So, continued to replace all the other electrolytic capacitors on the board. Did a total retouch of all the solder points on the main board and other boards. Cleaned the solder side and component side of the PCBs to the extent possible. Set worked very well when tested for many hours.
Another mission accomplished and the intense satisfaction got added to its collection bag.
Here are a few pictures:
Set in working condition
The culprits photographed before disposal!
This article was prepared for you by Parasuraman Subramanian from India. He is 70 years old and has more than 30 years’ experience in handling antique equipment like Valve Radio, Amps, Reel Tape Recorders and currently studying latest tech-classes conducted by Kerala State Electronics Technicians’ Association. He has done graduation in BBA degree, private diploma in Radio Engineering and retired as MD of a USA company. Presently working as Consultant to Hospital and other institutions.
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