Comments on: The Never Ending Thrill Of Repairing Radios

By: Parasuraman S

Parasuraman S — Tue, 09 Dec 2025 13:43:53 +0000

In reply to Philip.

Very unique and interesting experience!

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By: Philip

Philip — Mon, 08 Dec 2025 18:18:04 +0000

I'm sorry for having delayed to send an extension of my explanation. When receiveing the radio from a fellow technician, it was in pieces. solely for extracting spare parts. He decided that the radios dead condition was no longer going to be the cause of a splitting headache for him.Just as much, the real radio owner, for the sake of peace of mind had given up and abandoned it. But one day, playfully kind of, i joined the two boards through the cables which were still intact. I then fed power to it using a 5V DC output module connected to the 2200uF16V input power capacitor pins. It was lifeless when switched on.To cut a long story short due to limited space, both the collector and emitter pins of the regulator ic 7533-1 were short circuited. The two tracks that were connected to the regulator pins run parallel all the way to pins 6 and 7 of the mystery IC. Every single component attache to the two tracks indicated a short. Cutting the track at the foot of pin 6 made the short to vanish. Ghost-host IC !

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By: Parasuraman S

Parasuraman S — Mon, 08 Dec 2025 14:50:10 +0000

In reply to Adam S.

It is a self-adjusting type and can accommodate as much as we put in, expanding its belly like a python! (LOL) Many thanks for your encouraging and hilarious comments!

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By: Parasuraman S

Parasuraman S — Mon, 08 Dec 2025 14:48:00 +0000

In reply to Philip.

Kindly refer to one of my articles: https://jestineyong.com/restoration-and-modification-of-panasonic-rx-cs730-two-in-one/

Thanks again for some more peculiar experiences shared!

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By: Adam S

Adam S — Mon, 08 Dec 2025 11:20:03 +0000

More excellent repairs, Parasuraman!

Although I am worried about your satisfaction collection bag - I'm hoping it is huge as it must otherwise be overflowing or bursting at the seams by now!

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By: Philip

Philip — Mon, 08 Dec 2025 09:09:18 +0000

Thank you sir for your kind respond. Referring to my comments, I had written about a certain IC ...936... well its a jargon unknown to you for IC-KTO936MB. Now, try even harder to understand my laymans explanation here. When a radio mainboard is held such that the small dot mark on the IC is at the upper left corner of the IC, the first two IC pins nearest the dot, have tracks connecting them to a switch. Which in my own thinking is Ucc connection. This is not the case with the IC in the radio I was brought to repair. Infact the fast three pins have no track connections. The easily noticed similarity when compared with four other radio mainboards is that all ICs bottom left pin connections run to the middle pin of 3 pins of a GANG (component). So without an identification number, replacing the IC with KTO936MB will purely be trial and error. No, not your student, Engr Parasuraman. DIFFERENT ISSUE; WHAT ARE THE BEST POINTS ON A RADIO MOTHERBOARD TO CONNECT A USB BOARD/MODULE WITH THREE UNMARKED CABLES ?

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By: Parasuraman S

Parasuraman S — Sun, 07 Dec 2025 13:14:53 +0000

In reply to Philip.

Very interesting to read your comments packed with experiences! Many thanks!

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By: Parasuraman S

Parasuraman S — Sun, 07 Dec 2025 13:13:11 +0000

In reply to Philip.

Many thanks for sharing your experience with Radios! Very nostalgic! Curious to know what that IC is!

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By: Parasuraman S

Parasuraman S — Sun, 07 Dec 2025 13:11:10 +0000

In reply to Mark J.

Many thanks for your comments and encouragement, dear Mark!

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By: Parasuraman S

Parasuraman S — Sun, 07 Dec 2025 13:10:23 +0000

In reply to Yogesh Panchal.

Many thanks, Yogesh Bai!

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