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.
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Paris Azis
May 21, 2022 at 2:00 pm
I envy your patience Parasuraman! It seems inexhaustible to me!
Parasuraman S
May 21, 2022 at 10:19 pm
Many thanks! Patience and perseverance always pays!
Waleed Rishmawi
May 21, 2022 at 3:57 pm
there is another way of opening the back of the device when the screws are stripped. I usually drill the tip of the screws, take the cover off and then take out the rest of the screws left in. I found that very easy and fast way top open such devices. thanks for sharing and have a blessed day my friend
Parasuraman S
May 21, 2022 at 10:22 pm
Unfortunately, I do not have a very precise drilling machine, which does not wobble. Secondly, I do not have such a long drill that can go in. Thirdly, the screws are not easily visible from the top for a precise placement of the drill head! How you are managing to do it could perhaps be shared in one of your next article! Many thanks, dear friend!
Albert van Bemmelen
May 21, 2022 at 5:04 pm
Another carefully rescued radio cassette recorder!
Fevibond and Fevikwik are to me still unknown never used glues. Although I have several other glue types ready available in my fridge when needed. And at my job I use some duct tape to hold together the plastic chain case from falling off from my post delivery bike.
Parasuraman S
May 21, 2022 at 10:22 pm
Many thanks for your comments and tips!
Babu M S
May 22, 2022 at 12:44 am
your given rebirth for dead radio cassette recorder and avoided E waste. Thank you very much for sharing sir.
Parasuraman S
May 22, 2022 at 6:36 pm
Many thanks, Babu!
Arun Kumar
May 22, 2022 at 1:31 am
Baap re Baap,
You have too much patience Sir,
Replacing almost 22 caps
Hat's off to you once again
Parasuraman S
May 22, 2022 at 6:38 pm
My record is more than 130-140 caps, if I remember well! Ha! Ha! It is a thrill to do that thorough job and do retouch of all the solder joints! I just love it! Many thanks for your comments!
Yogesh Panchal
May 23, 2022 at 10:47 pm
Good job sir,
Opening stripped screws is also required skill & Patience.
Parasuraman Subramanian
May 24, 2022 at 3:15 pm
Many thanks! Kindly explain ways used by you in next article!