MUD DAUBER WASP FORCED ME TO BREAK OPEN SANYO BIG-100K RADIO CASSETTE RECORDER
This set was brought by a regular customer stating that it was lying unused and wanted me to look into the possibility of giving it a life. The handle was broken to two pieces. When I tried to open, I noticed that mud dauber wasps have blocked almost all the screw holes! Though I did my best to clean the holes and reach the screw heads, I found that the screw heads had rusted and lost the grooves. I told the customer that there was only one way; i.e., break the legs and open, which she agreed.
I had a screwdriver with a sharpened tip like a thistle with its end slightly bent. This was made by me long back to meet such needs, as many break-open cases do come in. The bend is needed so that the screwdriver turned thistle cuts the sides of the screws to detach its hold. After prolonged efforts, the front side came off and I cleaned the set thoroughly.
Replaced the broken belt and lubricated all controls and switches and applied power. The output was dropping and found distorted when the volume control was turned to full. I knew that the set required replacement of caps at-least in the power supply section. So, I started removing these one by one and look at what I saw on the first one removed:
So, I decided to replace all the electrolytic caps on the board and went ahead. Then retouched all the soldering points from one end to the other. Cleaned the board thoroughly using IPA.
Then just inserted the board back in its place to play and check. The performance was very good both on tape and radio.
So, fixed all screws of the board and tape mechanism. Then joined the broken handled using Fevibond and Fevikwik, and then inserted cut leads at a couple of places using my soldering iron. Then the broken piece held in place properly.
Used a strong tape to fix the front portion to the back portion of the set, as there was no other go.
My efforts to get some long screws to fix the front cabinet to the rear, was futile. Thin screws of such length were not available in the market.
Anyhow, the set worked very well and that was enough for satisfaction to jump into the bag.
This article was prepared for you by Parasuraman Subramanian from India. He is 72 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.
Please give a support by clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.
P.S-If you enjoyed reading this, click here to subscribe to my blog (free subscription). That way, you’ll never miss a post. You can also forward this website link to your friends and colleagues-thanks!
You may check on his previous article on Restored A Defective Power Supply And Motherboard In Samsung Monitor 632NW