Rode K2 Rear Capsule not working

[austinkane1]

Hi all I received a Rode K2 from a friend and the rear capsule isn't working. That is there is no change in the rear capsule's output regardless of where the pattern select is on the the power supply, the front capsule does change slightly and as expected (and sounds great). I attempted replacing the capsule with a Dachman Audio C12 clone and have the same issue, I reversed the wiring of the dachman and confirmed both capsules are working.

Does anyone know what the voltages are suppose to be on the mic cable and what the pinout corresponds to? I haven't been able to locate any schematics for the power supply, and only a hand drawn version of the mic's circuit.

Any suggestions of what to try next? I'm talented at soldering and following directions but I'm still very much learning troubleshooting and engineering.

 

[Khron]

Cold / broken solder joint, or faulty resistor(s) in the rear diaphragm polarization circuit?

 

[austinkane1]

Cold / broken solder joint, or faulty resistor(s) in the rear diaphragm polarization circuit?

That's kinda what I'm thinking but I'm not sure what part of the circuit that is, the labelling is vague on the PCB's and I'm still at an electronics 101 level when it comes to following a circuit, especially without schematics.

 

[Ricardus]

So it's basically always in Omni?

 

[austinkane1]

So it's basically always in Omni?

It's basically always in Cardioid, the front capsule has a slightly narrower pickup pattern when I change it to figure 8 on the power supply, as it should. but at no point when sweeping from omni to figure 8 does the rear capsule pass sound. As I said in my original post, I tested the capsule and both sides are functional, so it's something to do with the circuitry in the K2

 

[Gus]

Look at the polarity of the supply and how the circuit is designed.
You have the beginning of your answer in your posts

Only cardiod and nothing else means the back is not getting a variable voltage. Why it is not getting it is what you need to trace.

Have you seen this?
https://groupdiy.com/index.php?topic=30971.msg375974#msg375974

 

[mregorfeed]

Hi, I had the same problem when I bought this microphone from a friend. I don’t have a service center in my country and I just don’t know what to do.

 

[Khron]

Hi, I had the same problem when I bought this microphone from a friend. I don’t have a service center in my country and I just don’t know what to do.

Do you have a multimeter, and know how to use it?

 

[mregorfeed]

У вас есть мультиметр, и вы знаете, как им пользоваться?

Нет, но я могу одолжить его у своего друга. Я хочу сказать, что я очень тупой в электронике

 

[Khron]

Нет, но я могу одолжить его у своего друга. Я хочу сказать, что я очень тупой в электронике

Even if Chrome translates what we write into Russian (?), it does NOT translate what you write, back into English...

 

[mregorfeed]

No, but I can borrow it from my friend. I want to say that I am very stupid in electronics*

 

[Khron]

No, but I can borrow it from my friend. I want to say that I am very stupid in electronics*

Could your friend (who is hopefully a bit more familiar with electronics) help, perhaps?

 

[mregorfeed]

Could your friend (who is hopefully a bit more familiar with electronics) help, perhaps?

yes, I think he can try to help me