help in identifying component

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eduardo_gj1

Member

• Oct 4, 2019

• #1

This component that belongs to a RODE NTA2 condenser microphone, unfortunately it does not work anymore, and I sent it to be repaired in the RODE technical service, and its answer was that the Mainboard has to be changed, the problem is that the mainboard costs € 38 but with the The total workforce is € 201, that is an exaggeration of price, so I would like to repair it, ahh forget to mention that they do not sell the parts to repair the microphone by oneself.

they are two equal components, they look like a capacitor but it has a black line in the middle, with the multimeter I measured it in capacitance, resistance, diode, continuity and I don't get any measurement. and I really have no idea what component it is and also what value it has

 

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vedo35

Member

• Oct 4, 2019

• #2

First photo is not so clear. But probably a chocke.

 

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eduardo_gj1

Member

• Oct 4, 2019

• #3

 

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eduardo_gj1

Member

• Oct 4, 2019

• #4

sorry this its the best picture i can take i know its not the best

 

rjenkinsgb

Well-Known Member

Most Helpful Member

• Oct 4, 2019

• #5

They are probably the capsule bias resistors - one gigohm or thereabouts, in a typical condenser mic.

You won't get sensible readings with most multimeters, they will read open circuit.

 

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eduardo_gj1

Member

• Oct 4, 2019

• #6

ok, i have 4 multimeter and I don't get any measurement

 

rjenkinsgb

Well-Known Member

Most Helpful Member

• Oct 4, 2019

• #7

I cannot find a schematic for the NT2A, but here is one for the NT2:

https://medias.audiofanzine.com/files/rodent2tl-472041.pdf

R31 & R32 are the two 1G Ohm resistors, in that one.

I'd suspect the audio part is likely fairly similar, but yours has a CMOS IC as well - I'm guessing that is the oscillator and driver for the high voltage generator, with the IC and parts at the lower right quadrant of the PCB being the power section, replacing the lower left part of the schematic.

 

rjenkinsgb

Well-Known Member

Most Helpful Member

• Oct 4, 2019

• #8

eduardo_gj1 said:

ok, i have 4 multimeter and I don't get any measurement

Click to expand...

Even our best Fluke meter does not register a 1G resistor on its resistance range. It detects it on conductance, a change of one nanosiemens.

 

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eduardo_gj1

Member

• Oct 4, 2019

• #9

nt2a circuit for repair

hi someone send me rode nt2a for repair ...... noise problem ::). rode used prefect circuit in nt2a.

groupdiy.com

in this page its the schematic, i already register, but still waiting for the administrator aprovation, and that was 3 days ago so, is someone here its member can download and upload here pls

 

rjenkinsgb

Well-Known Member

Most Helpful Member

• Oct 4, 2019

• #10

What is the actual fault with the microphone?

 

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eduardo_gj1

Member

• Oct 4, 2019

• #11

the microphone is heard very low, and with a noise in the background

 

rjenkinsgb

Well-Known Member

Most Helpful Member

• Oct 4, 2019

• #12

Some posts relating to that exact fault say it's often cured just be re-flowing all the soldered joints on the circuit board.
(ie. heat each joint and apply a very small extra amount of flux cored solder).

 

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eduardo_gj1

Member

• Oct 4, 2019

• #13

yes, i already read about that, but i don't know if its the best way to repair, but at the end i will do it tomorrow, its a 250€ mic and i want to fix it

 

tvtech

Well-Known Member

Most Helpful Member

• Oct 4, 2019

• #14

eduardo_gj1 said:

yes, i already read about that, but i don't know if its the best way to repair, but at the end i will do it tomorrow, its a 250€ mic and i want to fix it

Click to expand...

You're been given good advise. I would listen if I were you. Members here try VERY hard to help.
ETO is not about guessing. Like other forums out there.

 

tvtech

Well-Known Member

Most Helpful Member

• Oct 4, 2019

• #15

We're a small but proud forum. Cause WE know stuff. And we have pros here that don't just jabber senseless advice.

 

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eduardo_gj1

Member

• Oct 4, 2019

• #16

i know and you guys help me and so many time, i just want to solder tomorrow not today, and if i find the schematic i upload here.

 

tvtech

Well-Known Member

Most Helpful Member

• Oct 4, 2019

• #17

eduardo_gj1 said:

i know and you guys help me and so many time, i just want to solder tomorrow not today, and if i find the schematic i upload here.

Click to expand...

Ok. Stay cool. We're here to help.

 

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eduardo_gj1

Member

• Oct 5, 2019

• #18

One question, I saw a video of a man who checks the ic with the multimeter in diode mode, basically the red clamp of the multimeter on the negative leg of the ic and the negative on each of the legs of the ic, and today I made that test on the CD40106 ic, and on all legs except number 9, could the ic be damaged?

this ist the datasheet

https://www.ti.com/lit/ds/symlink/cd40106b.pdf

 

rjenkinsgb

Well-Known Member

Most Helpful Member

• Oct 5, 2019

• #19

What are the voltages on the two points I've marked, relative to the XLR ground pin? There should be tens of volts on one or both.
If there is, the IC is OK.

It does not have to have the capsule connected for this, if it is presently detached - just the XLR side with phantom power.

 

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eduardo_gj1

Member

• Oct 5, 2019

• #20

hi again, its 0,002v on both resistor and on leg 14 of the ic its 0.002v