This 35-year-old Cassette Player will get a new LIFE?

is 35 years old cassette player. 

I found this cassette player in our storeroom.

Actually, this cassette player was my dad's and I want to give this cassette player a new life.

is it really possible in 2024?

this is a BPL cassette player

and those Golden days this was a marvelous gift from BPL

and the model number is S7253, here you can see this cassette player mode 

in this mood, you will find an AM, cassette Player, FM even SW.

this switch is for switching the radio band for what kind of Band you want to listen to.

Even With this variable capacitor, you can change your desired radio station.

this switch is really very tight and junky

I don't know how I fix this switch even the new one definitely will not be found

To listen to a specific radio station I select any kind of Band here and after that, I tune the variable capacitor here but this cassette player can't receive any kind of radio station because I think this variable capacitor is not good even or another problem.

This is volume controlling potentiometer and I am pretty sure this also not be good.

On the other hand, hear the cassette and radio selection switch.

so finally I select the cassette mode and you can see the cassette player make a noise but not play anything

I am lucky here surprisingly I got a cassette to check this whole thing

I have done many checks, Now let's open it up and see what's inside

 Here you can see the driving belt is cut.

 Also, the second driving belt is too loose which is not enough to drive the second gear

And I pray to God right now that there are no more problems with this mechanical.

Because I can't find any parts of it anywhere.

So to make sure I'm going to open up Total Mechanical and see that everything is correct here.

Just changing the belts will fix everything I think

This is probably called the head to understand how far the magnetic wave is in the cassette.

When this cassette comes in contact with this head, it senses the magnetic field inside the cassette and generates a very small analog signal, which amplifies and we hear the sound in the speaker.

I have already said a lot about this cassette player mechanism anyway,  let's take a look at the circuit board of this cassette player.

The screws must be removed to remove the cassette player circuit board

see here this is the actual marvelous beauty.

at first, my eyes fell on this AM antenna, it's bad, and even if it's ok, the frequency will change.

Anyway seeing what can i do after a while.

Now let's try to understand which IC is used here for what purpose

this is the main radio receiver IC this TA8127N IC works actually for AM and FM radio receiving purposes,

On the other hand, it is the AN7312 IC that manages everything in the cassette player

And the job of this IC is to amplify the small analog signal that I told you earlier

And this last IC is our all-favorite TDA2822 audio amplifier IC

Anyway, my first task now is to change this potentiometer, although I haven't found a similar potentiometer.

I'll change it though,

10k potentiometer is used here, there is no problem in using others

the next most important thing is to apply 40D liquid to these switches, this is because all the rust in these switches will be gone.

Fingers crossed,  hope everything will work properly

But I'll recheck the switches again with my multimeter because I don't want to be in the dark anyway.

Maybe you are thinking that there are so many pins on the back of this switch and how do I measure it correctly?

It may help you to understand by looking at the diagram.

It's very simple, it's just a work in this pattern, you may find it easier to understand by looking at the diagram of this paper

Anyway all the switches are fine and I have nothing to worry about

Now I want to check it again to see if everything is correct so far?

So I will add a speaker and power source to it.

See, when I'm switching radio stations, I'm not getting any radio signal here.

Why is the radio station not receiving it?

I need to see the data set of this IC to understand it better

see,

This is the AM oscillation pin, and I believe this pin will have a 700 to 1500 kHz signal.

When connecting the oscilloscope to this pin I am not getting any signal,

From this, I am absolutely sure that the AM antenna may not be oscillating.

Or there may be some other capacitor problem

when I found that I had AM antenna problems,

so, I decided to remove the antenna and rebuild this coil.

Maybe my resonant frequency will shift around in the process but I will manage that

I tried as usual to make it right, don't know what will happen.

I will soldar the wires of this inductor where they were

See now 900 kHZ frequency is showing.

hope everything will work properly this time

this time I was not disappointed the AM radio station was receiving as well as I had hoped.

Since I am tortured with this AM inductor, so I could tune this variable inductor and control the AGC for better radio reception.

 AGC stands for Automatic Gain Control, I won't go into too much detail about it because it's another video subject

By the way, the AM radio problem is now solved, but does FM work on it?

Or will it be hard work, let's see.

Since the FM station is far away from my house, that is why I will add an antenna so that I can receive the FM station properly.

 anyway, I received at least one FM station.

If you want to make the FM station sound nicer, you can tune the sub-capacitor between these variable capacitors.

Anyway, we know a lot about the radio now the question is how the cassette player works?

 At last, we saw that our driving belt was bad, luckily I found this driving belt on Amazon, link you will get the description box.

And look the driving belt fits nicely with this mechanism.

As I expected.

Now let's play this cassette!

And watch the cassette play brilliantly without any issues.

 

You can increase and decrease the rpm of your cassette if you wish by turning the potentiometer on this motor, anyway so far everything in our radio is working properly and my expectations have been met.

Now I can gift it to my mother.

Anyway let's set everything as before

you can watch this video

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