JVC M70 Restoration and Bluetooth Mod

This is a JVC M70. So far I have restored 3 of them. This one came to me recently and it had no powering up issue. The radio had no sound, but the cassette reels spun when the buttons were pressed. It was a very strange and interesting condition.

I started with troubleshooting a power failure issue. Checking from the power transformer, replacing a fuse, clean all switches with contact cleaner. At some point I tried playing music with AUX in, and the sound came out from the speakers. However, even the volume was set up to the max, it was so small sound. Anyway, after I cleaned up all switches and controllers, I found out that pressing cassette button would send power to the amp and radio sound was on. In this situation, when I turn ON the main power switch, the radio sound went off. Very interesting. So I guessed that cassette deck power switch is only working switch, and the main power switch had something to do with this power frailer mystery. After cleaning the power switch witch was "leaf type switch", this mysterious power failure issue disappeared.

The next thing I found was that the cassette deck lost some parts. I ordered same cassette deck from Korea as a replacement. The arrived cassette deck's play/record head condition was really bad, so I used only necessary parts of it. After replacing parts and tested cassette deck, the auto stop feature did not work. So again, I replaced whole button mechanism. This time everything worked perfectly. In the film, I took apart cassette deck 2 times, however, to tell you the truth, I needed 5 times re-do for complete the cassette repair work. LOL.

I like M70, it is well built and well balanced machine. Enjoy the film.

Demonstration tape (Hitachi original)
1) Racing sound dynamics
2) Battle of Jerico

======================================
Special thanks to Pedro
The owner of this boombox is the boombox collector Pedro..
======================================

Donation welcome!

If you like my videos and would like to donate to me for my future video making work, I appreciate your kindness. Here are coin wallets and Paypal address. Thank you in advance.

https://www.paypal.me/teddyhashee358

BTC (Bitcoin):
1DQJChuaZi2bHamigZWVvKwHShsTJW9uQk
BCH (Bitcoin Cash):
qqe43k5hdvuzstz8zxmamn0qn6x44y4wzqj240h99n
ETH (Ether):
0xaC7578787cA1964cf45b314b2ac9eB2cF876FB05
LTC (Litecoin):
LNJf56cM4pRgH4G47EePCUGMQWAJLV4zyi