Neumann.Berlin Condenser Microohone User Manual

Neumann-Information 1

Re: Disassemblina and Cleanina of Neumann Condenser Microohones

The disassembli- of the microphones in amplifiers and capsule head is
described in
microphone.

Attention:

-~­It is by no means allowed to tauch with the

ing elements
impedance
and

dirt

voltages.

the operating instructions

for

the

connection

Parts

quantities tan diminish the isolation

of the

circuit

of the capsule head. Also the other high

may not be touched.

which

are delivered

finger

88 043

the contact and isolat-

I

with each

4lready minimum grease

figures

and Cause noise

April 1988

Cleaning the microphone amplifier:
Existing dirt on components and contacts tan be removed by means of a

soft brush using

Microphone capsules:

-

The microphone capsules of U 89 i, TLM 170 i and the KM . . . miniature micro­phones
0 Volt.

dirt

When microphone capsules had to be constructed in a way that the isolating

areas between

membrane Systems of U 67, U 87 (A) i, SM 69, SM 69 fet, USM 69 i, IJ 47 fet)

after a

membranes the capsule has
U 67, U 87 (A) i, U 47 fet microphones the 3 mounting

plate of the capsule head have

assembly tan be

At the microphones SM 69, SM 69 fet, USM 69 i the disassembly of the protect-

ing grille is more difficult:

The black dot on the upper

removed.
pressed
at

spring becomes visible which has also to be pressed backward, now the

complete

springs

assembly tan now easily be

- -

a detergent

are

constructed in a way that the total surface is connected to

For

this

reason

and atmospheric influences and should not be cleaned.

the

electrodes

long

period

of

Operation

removed from

Behind the opening a spring is visible, this spring has to be

back by approximately 1 mm,

the

front

side.

upper part

to be lost these should

Now the

of the

on the basis of

these microphones

could be

noise

to

be

removed from its protecting grille.

to

be

removed

the capsule head.

part

of the

the

grille

has

grille tan carefully

also be removed.

removed from

Freon, Kaltron or

are extremely insensitive

reached

voltages

grille

grille

to

the

by

dirt

may

and then the complete capsule

(position O”) has to be

tan then slightly be lifted

be

turned

be

The complete capsule

lower part

Frigen.

against

(the

large

occur. For

screws at

by 180°, then another

removed.

of the

double

cleaning the

the

To

prevent

grillle.

At t-he

lower

the

CHARLOl-TENSTRASSE 3 D-i000 BERLIN 61 POSTFACH 610469 TELEGRAMM: NEUMANNACUSTIC

TELEFON: (030) 25993-0 TELEFAX: (030) 25993-108 TELEX: 184595 NEUAK D

pto.

Printed in Germany

Cleaning the membrane:
Every membrane is carefully brushed with a

water.

soft blott ing-Paper. This
the capsule
this method have to be exchanged.

Cleaning the membrane by means of

These solvents
For careful cleaning then no time remains and inhomogenit
on the membrane;
solvents could
solvents tan
condense below the membrane which cannot be
Besides that
of the membrane is influenced.

The

water

with the dissolved

is really

are too

clean. Those capsules which cannot be

thinly liquid and fugitive.

also transport dirt

also cool
the

use of solvents

down the

procedure

membrane strongly

dirt

has

solvents is not allowed

below the membrane fixing

bears

very

tan then be

to

be

repeated several

removed from there.

the

risk

soft brush with distilled

removed with very

and then humidity tan

that the mechanical tension

cleaned by

ives

may

rinqs:

times unt

rema in

il