I am looking for information about the Densei EC-2019 microphone

Hello!

At the flea market I noticed old things, the base microphone is probably the Densei EC-2019, as it was sold by an older man and wanted all PLN 10 for it, I decided to buy it with the intention of connecting to the recently repaired Jackson I. Unfortunately, too much about this microphone there is no network, I am looking for a diagram to check if there is anything missing on the pcb and a connection diagram to Jackson I with a 6-pin socket. I was assured that the microphone is working, it has one drawback - you can hear some noise in the background.
Maybe some of your colleagues know what the "monitor" socket on the back panel is for?

Thank you in advance and best regards.

Monitor - for listening to the same what comes out of the microphone on the headphones.
M.

The monitor socket is used to "check" its modulation from the microphone on the headphones - without using the CB radio.

Added after 32 [seconds]:

chroba-we wrote at the same time with sp5it "_

Thanks gentlemen, a useful thing such a socket, because I will be able to check the "interference" that the previous owner spoke about. The question of connecting to Jackson And I think I have also resolved, because the signals are described on the laminate. Prophylactically I will replace electrolytic capacitors and a trick with contact for potentiometers. I think the sponge is missing, but that's a detail. Some beauty treatments and I'll have an interesting relic on my desk ... let it work.

I am sorry that I am writing this post under my own post, but unfortunately I decided too quickly that everything would be ok with this microphone.
Unfortunately, there is no audio coming from the pcb of the microphone to the cb of the radio. After connecting the headphones to the "monitor" socket, I hear my voice, unfortunately nothing happens at the output. I would be grateful for any piece of the scheme of this "contraption". There are several names for the same microphone, apparently some company produced them for several companies:

Densei EC-2019
EuroCB EC-2019
Intek M-600
Team DM-7600
Voicecraft DM-7600B
Altai DM-7600B

Thank you in advance and best regards.

EDIT: March 1 5:46 PM

Microphone partially repaired, damaged choke and capacitor in BA4558 power line. Right now the modulation is correct, the rb is working properly, the potentiometer amplification is working properly. Unfortunately, the echo does not work, based on the MN3208 and MN3102, I know that it was quite a popular design on these chips. Can someone explain to me "like a cow on the border" what is the principle of the echo in this case and how can you check these systems?



EDIT: March 2 2.30 PM

It looks like the MN3208 chip is damaged, the power supply is correct, the oscillation from the MN3102 is correct, the signal from the generator connected instead of the microphone at the input is correct, and the output is what is shown in the second photo.