Rusted Iron Cores And Wires Found In Leading Brand JAMO Speaker System
This speaker system was brought to me by my school classmate and a regular customer with the complaint that it was dead. After removing the rear connector board, when I pulled it, I observed heavy rusting and the connection to the input sockets were worn out. I then removed the front grill and unscrewed all the three speakers; i.e., Woofer, Midrange and Tweeter. I noticed that all the wires to the speakers were intact and all showed continuity when checked directly.
Then turned my attention to the missing connection wires of the input. I used thick lithium battery bonding metal strips and connected the inputs to the appropriate places on the board. The board contained two big coils, the iron cores of which were found lying loose inside the box. The cores were also rusted. After cleaning the cores to the extent possible, I re-fixed the speakers and checked. The inputs were reaching all the three speakers. Then inserted the iron cores on the two coils and fixed them using Fevibond ensuring that they were not touching the coils.
So, I fixed the input unit and delivered the speaker to the customer, deriving satisfaction, which got added as usual. Here are a few pictures of the inside:
This article was prepared for you by Parasuraman Subramanian from India. He is 74 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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Yogesh Panchal
June 1, 2024 at 2:48 pm
Rust on iron core may reoccur, i found some brands are good in performance but poor in Build quality. Good Fix, Sir
Waleed Rishmawi
June 1, 2024 at 4:46 pm
good repair but I think the core will get rusty again. thanks for sharing and have a blessed day
Parasuraman S
June 1, 2024 at 8:56 pm
Yes, it is likely to. But we cannot apply any lubricant because of the coil and its placement.
Parasuraman S
June 1, 2024 at 5:07 pm
Yes, you are right!
Albert van Bemmelen
June 1, 2024 at 5:11 pm
That looks like a very nice cleaning job seeing the before and after photos Parasuraman! They now look brandnew! It is funny that you kind of advertised this Jamo brand by mentioning them being a leading speaker system firm.
Parasuraman S
June 1, 2024 at 9:00 pm
Jamo (German) is a leading speaker system known in the market. But we can assess only after we open one for repair such as this case. The customer had paid through his nose for these speakers and was shocked to see the inside when I showed the inside. In fact, he was with me in the initial stage of opening etc.
AdamS
June 3, 2024 at 4:45 pm
Jamo is actually a Danish company - founded in 1968 in Glyngøre by Preben Jacobsen and Julius Mortensen - "Jamo" comes from the first two letters of each of their surnames.
The company is now part of Voxx International who own other speaker brands including Klipsch, Acoustic Research and Magnat.
Parasuraman S
June 4, 2024 at 3:28 pm
Thanks for the information update!