Neumann.Berlin Condenser Microohone Betriebsanleitung

Neumann-Information 1

88 043 I April 1988

Re: Disassemblina and Cleanina of Neumann Condenser Microohones

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

described in

the operating instructions

which

are delivered

with each

microphone.

Attention:

-~-

It is by no means allowed to tauch with the

finger

the contact and isolat-

ing elements

for

the

connection

of the capsule head. Also the other high

impedance

Parts

of the

circuit

may not be touched.

4lready minimum grease

and

dirt

quantities tan diminish the isolation

figures

and Cause noise

voltages.

Cleaning the microphone amplifier:

- -

Existing dirt on components and contacts tan be removed by means of a

soft brush using

a detergent

on the basis of

Freon, Kaltron or

Frigen.

Microphone capsules:

The microphone capsules of U 89 i, TLM 170 i and the KM . . . miniature micro-

phones

are

constructed in a way that the total surface is connected to

0 Volt.

For

this

reason

these microphones

are extremely insensitive

against

dirt

and atmospheric influences and should not be cleaned.

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

areas between

the

electrodes

could be

reached

dirt

(the

large

double

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

after a

long

period

Operation

noise

voltages

may

occur. For

cleaning the

membranes the capsule has

removed from its protecting grille.

At t-he

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

screws at

the

lower

plate of the capsule head have

removed

and then the complete capsule

assembly tan be

removed from

the capsule head.

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

part

of the

grille

(position O”) has to be

removed.

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

pressed

back by approximately 1 mm, the

grille

tan then slightly be lifted

the

front

side. Now the

grille

has

turned

by 180°, then another

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

complete

upper part

of the

grille tan carefully

removed.

prevent

the

springs

to be lost these should

also be removed.

The complete capsule

assembly tan now easily be

removed from

the

lower part

of the

grillle.

pto.

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

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

Cleaning the membrane:

Every membrane is carefully brushed with a

very

soft brush with distilled

water.

The

water

with the dissolved

dirt

tan then be

removed with very

soft blott ing-Paper. This

procedure

has

repeated several

times unt

the capsule

is really

clean. Those capsules which cannot be

cleaned by

this method have to be exchanged.

Cleaning the membrane by means of

solvents is not allowed

These solvents

are too

thinly liquid and fugitive.

For careful cleaning then no time remains and inhomogenit

on the membrane;

ives

may

rema in

solvents could

also transport dirt

below the membrane fixing

rinqs:

solvents tan

also cool

down the

membrane strongly

and then humidity tan

condense below the membrane which cannot be

removed from there.

Besides that

the

use of solvents

bears

the

risk

that the mechanical tension

of the membrane is influenced.

Dieses Handbuch passt für folgende Modelle

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