This is a really cute LENOXX SOUND model C-736G boombox. It comes with the original box. It was in good working condition except for cassette deck. Also, it had a very scratchy sound from the volume potentiometer. So I overhauled it then added the Bluetooth system.
During restoring the cassette deck, I encountered a heavy wow and flatter noise. So what I did was, 1) replacing the pinch roller, 2) replacing the drive belt, 3) replacing the motor. After 4 times of re-do, it finally started working properly. It still has a slight wow and flatter noise, but when playing the music, for me, it is OK. The successful combination was a new pinch roller + the original motor + the wider drive belt.
The Bluetooth mod, I brought the power for the Bluetooth from the motor, removed ground-loop noise by using DC/DC isolated power supply, and injected Bluetooth music signal to the volume potentiometer. I think I should add resistors between the Bluetooth signal and volume potentiometer, but maybe this boombox's amp will be able to handle it without resistors.
By the way, I just started posting pictures of what I am working with on Instagram.
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Demonstration tape (Hitachi original)
1) Battle of Jerico
Enjoy!
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Simple wiring diagram
tinyw.in/8S8K
The parts I used in this video.
Bluetooth receiver 4.0
amzn.to/2KD1Ya3
amzn.to/2Qn1feL
4.7uf ceramic multilayer monolythic NP capacitors
Amazon
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Ebay
goo.gl/6ieX4F
47uH Fixed Inductor
Amazon
amzn.to/2r85vAT
Ebay
goo.gl/1FZWjX
Comidox 5PCS B0505S-1W DC-DC 5V Power Supply Module 4 Pin Isolated converter
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PCB universal circuit board
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USB male female connector
amzn.to/2IsgDSZ
Step-Down Linear Voltage Regulator Module
amzn.to/2TRjbNt
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