Brüel & Kjær 2204 Service Instructions Manual

•

~

·

BRUEL

& KJJER

Nrerum-

Denmark

Consisting of:

Trouble Shooting:

SERVICE

INSTRUCTIONS

Impulse

Precision

Sound

Level

Meter

Checking Procedure

Power

Supply

Meter Circuit

Output

Amplifier

Input Amplifier

Weighting Network

Position

of

Components

Parts-List

Circuit Diagram

2204,1

2204,2

2204,3

2204.4

2204,5

2204,6

2204,7

2204,8

2204,9

2204

If

some sort

of

trouble occurs with this instrument then first check the D.

C.

working voltages from the Power Supply.

Then use the Checking Procedure with Block Diagram

in

order

to

localize a trouble

to

be

in

one certain circuit.

When a

fault has been found and remedied the voltages and adjustments which are influenced by the remedy must be

rechecked and the Checking Procedure can be used again

to

tell

if

all

basic functions of the instrument are fulfilled.

The tolerance stated

in

the

instructions can only be used as a guide for adjustment and control,

but

any deviations must

not

be

corrected without being sure

that

the tolerances of the instruments used for making the adjustment are so small as

to

have

no

influence on the measurements.

The instructions

in

this Manual are given purely as a guide to the service of equipment. Some faults,

as

f.inst. small

deviations

in

tolerances require for their correction special control equipment and extensive experience, and

in

these cases

it

is

necessary to send the instrument to the factory.

Spare Parts :

Please state type and serial number of apparatus when spare parts are ordered.

Instruments and Accessories necessary for service and repair:

Multimeter

(50,..Al

Frequency Generator with freq. range 2-70

OOOHz

. f.inst.Type 1013 and 1017

High

Impedance

AC

voltmeter f.inst. Type 2409

Frequency Analyzer f.inst. Type 2107

Oscilloscope

Pistonphone Type 4220

2204-3.69

1\.J

~

Cl

<0

RANGE

(black)

RANGE

I

f~

(transparent)

f......---

~

"'

~

0 ° 0

u

)(

FILTER SWITCH 1 I I I L

METER

SWITCH

Front of

metal

case

l'J

I

Acij.

of

Ref.

voltage

Ac(J

. of

P•l.

voltage

, I

~~

_r·o

--

Ampllfl•r

plut-ln

unit

Rear of

~tal

case

Battery cover

BRUEL

& KJJER

Nrerum - Denmark

Checking

Procedure

2204.1

val

id from Serial No 224805

JZ

0001

~--------1

Z

F0004

r--------,

I '

I

·-

-

------

- 1

3

.1

6V

1.1.

Sensi

t

ivity

a. RANGE (black) :

RANGE (transp):

FILTER SWITCH :

METER SWITCH:

:~:

.

~

;.

:!·i:'

!'

·

~

;

_

•

" 120"

"120"

"

Lin"

"Fast"

1013

1017

b.

FILTER SWITCH

to

" A-B-C-

D"

2204.1-3.69

9E

QQ.OL

__

_

approx, 1 V

t-;------o

DC

t-;------o

AC

Outputs

approx. 1,5 V

--

- -

--.

-

~

in '

R•c'

SV

JJ

2614

2204

Input

signal

to

front

end

of

2204: 3,16V, 1000Hz.

Adjust

"Gain Adj

."

for

10

dB

deflection (Adjustment

range

for

"Gain

Adj."

approx. + 3, -

10

dB)

Output

voltage

on"Ext.Filter

ln

":

0,2 V

"DC

Output"

: Approx. 1 V

(measured

with

High Imp,

"AC

Output

":

Approx. 1,5 V Voltmeter)

"AC

Output"

: 5 V

for

METER SWITCH in"

Rec

:·

Deflection

for

all

ranges

: 10

dB±

0,1

dB

.

continued

1.2. Frequency Response

RANGE

(black):

RANGE (transp):

FILTER

SWITCH:

METER SWITCH:

1.3.

Meter

Circuit

a.

RANGE (black):

RANGE (transp):

FILTER

SWITCH:

METER SWITCH:

b. METER SWITCH

to

c.

METER SWITCH

to

1.4. Overload Indicators

RANGE (black):

RANGE (transp):

FILTER

SWITCH:

METER SWITCH :

1.5. Noise

a.

RANGE (black):

RANGE (transp.):

FILTER

SWITCH:

METER SWITCH:

b.

RANGE (black):

RANGE (transp.):

FILTER

SWITCH:

METER SWITCH:

"120"

"Lin"

"Slow"

"120"

"Lin"

"Fast"

"Hold"

"Imp

"

"110"

"Lin"

"Fast"

"60"

"10"

"A"

"Slow"

"130"

"80"

"Lin"

"Fast"

1.6.·

Sensitivity

with

Microphone

a.

RANGE (black):

"Ref"

RANGE (transp):

"Ref"

FILTER

SWITCH:

"Lin"

METER SWITCH:

"Fast"

b.

RANGE (black)

to

"120"

2204.

1-6.70

Frequency: 1000Hz. Adjust the

input

voltage

for

a 9 dB deflection on

2204.

Vary

the frequency

from

2-70

OOOHz

Meter deflection: 8-10

dB

Frequency: 1000Hz. Adjust the

input

voltage

to

give exactly 9 dB

de-

flection on 2204.

Depress

"Meter

Reset" and

release

it

again

.

Meter

deflection: 9

dB±

0,05 dB.

Disconnect

input

signal and check that the deflection drops max. 0,5 dB in

one minute.

Adjust the

input

voltage

to

give a 8,6 dB deflection on 2204.

Disconnect the

input

signal by depressing "Oscillator

Stop"

on the Beat

Frequency

Oscillator and check

that

the deflection

is

0 dB after 2-4

sec.

Input

signal : 7

V,

1000Hz (corresponding

to

approx.

17

dB above

full

scale

deflection).

Depress

"Oscillator

Stop"

on the Beat Frequency Oscillator. When

re-

leasing "Oscillator

Stop"

both

"Overload indicators" should light up a

few

times.

During noise measurements the

input

of

Type 2204 should

be

shorted

with

a

51

pF capacitor, which

can

be

done by mounting a

51

pF

(stock ref.

CG

0006) inside a plug

JP

0018 and using

an

adaptor

JJ

2614

between

JP

0018 and Type 2204.

Be

sure

that

the contact surfaces

are

clean and free from dust.

Meter

deflection: Below 0 dB.

It

is

essential

that

the measurement

is

carried

out

in

a

quiet

room.

If

the

Sound

Level Meter

has

been

overloaded, the i.nstrument must

work

for

several

minutes before the meter

reaches

its normal deflection.

Remove Preamplifier

ZC

0007, and measure the noise

with

open input.

Meter

deflection:

Approx

. 0 dB.

Adjust

"Gain

Adj."

to

the correct "Open

circuit

sensitivity"

of

the

microphone.

Check the sensitivity

with

a Pistonphone 4220. The meter deflection on

2204 should

be

equal

to

the Sound

Pressure

Level produced by the Piston-

phone (Remember

to

correct

for

the actual static pressure).

Tolerance: ± 0,2 dB.

BRUEL&

KJ.tER

Ncerum

- Denmark

Battery

3-4.6 V

'1

2.2.

DC

Voltages

METER

SWITCH:

2204.2·3.69

-2

.

9V

"Ban

··

Povver

Supply

2204.2

valid from Serial

No

224805

-------------o

-9

.5 v

r---------..0

+ 5 v

+200V

+120V

-30

v

Simplified

Diagram

of Power Supply

ZG

0004

Check

the DC-voltages according

to

the drawing

to

the

printed circuits

XC

0335 showed on 2204.7 sheet 3

If

the ·9,5V

is

present and the Oscillator frequency

is

approx. 2,5

kHz

the transformer can be regarded

as

an ortjinary mains transformer with

secondary

voltages for the various circuits.

Small deviations

in

voltages can

be

adjusted by the potentiometers ac·

cording

to

following scheme, whereby greater deviations are rather due

to

a fault which should be corrected before adjustment.

Consumption from the batteries under

normal conditions

is

approx. 235

rnA

Adjustment of P902: -9,5 V

P903: 200 V

(Measured with a high impedance

P904: 47,5 V voltmeter)

The transistors V 910 and

911

are acting as battery regulators and the

emitter

voltage on both should be approx. -2,9 V.

If

this voltage

is

-2,9 V and the

DC

converter

is

not oscillating disconnect

the different

loads one by one.

If

oscillation

is

impossible even unloaded

the transformer or the converter transistors (V907 and 909) are likely

to

be defective. ·

If

the -2,9 V

is

not present examine transistor V 901, 902, 905 or 906

for faults

as

this

is

the regulating circuit for V 910 and 911.

•

BROEL

& KJ.lER

Ncerum

- Denmark

3.

1.

Sensitivity Check

a.

RANGE

(black):

RANGE (transp):

FILTER

SWITCH :

METER SWITCH :

b.

METER SWITCH

to

c.

METER

SWITCH

to

3.2.

Sensitivity Adjustment

a.

RANGE

(black):

RANGE (transp):

FILTER

SWITCH:

METER SWITCH:

2204.3-11.69

Meter

Circuit

2204.3

val

id from Serial No 277645

sheet

1.

Simplified Diagram

of

Meter Circuit

ZL

0001 and ZE 0016

1013

1017

"120"

"Ext.

Filter"

"Rec

"Fast"

"Hold"

"120"

"Ext

. Filter

"

"Rec"

2204

Frequency 1000Hz. Adjust the input

voltage for 5 V.RMSon

"AC

out

-

put"

socket.

Meter

deflection: Exactly 10 dB.

Depress

"Meter Reset"

and

release

it

again.

Meter

deflection: 10

dB±

0,05

dB

Frequency: 1000Hz. Adjus.t the

input

voltage for

5V.

RMS

on

"AC

Output"

socket.

continued

b.

METER SWITCH

to

"Fast"

c.

METER SWITCH

to

"Imp"

d. METER SWITCH

to

"Fast"

e.

METER SWITCH

to

"Hold"

f.

METER SWITCH

to

"Batt"

3.3. Overshoot

RANGE

(black) :

RANGE (transp):

FIL

TEA SWITCH :

METER SWITCH :

"120"

"Ext.

Filter"

"Fast"

3.4. Meter Decay Time Constants

a.

RANGE (black):

RANGE (transp):

FILTER

SWITCH:

METER SWITCH:

"120"

"Ext.

Filter"

"Imp"

b.

METER SWITCH

to

"Hold"

2204.3-6.70

Check

with

an

oscilloscope that the double rectified curves on the

cathodes

of

Q 503 and Q 504

are

equal.

If

necessary

adjust P 803. (XC 0332)

Disconnect

input

signal.

Unsolder

one end

of

diode Q

601

and shortconnect the

input

of

the

Meter

Amplifier

to

ground (R601 on XC 0345). Adjust P 601 (XC 0345

for

OV!:

5mV

on measuring

point

R 611, V 601

b.

Check

that

the deflection on 2204

is

·

oo

If

necessary

adjust P 604.

When

connecting

input

signal the deflection on 2204 should

be

exactly 10

dB.

If

necessary

adjust P 602.

Depress

"Meter

Reset" shortly and check the meter deflection: 10 dB.

If

necessary

adjust P 603.

With a battery voltage

of

3V

the meter should deflect

to

the lower mark

of

the battery

scale.

If

necessary

change in value

of

R 704.

Frequency: 1000Hz. Adjust the

input

voltage

for

an

8 dB deflection on

2204.

Disconnect the

input

signal shortly by depressing the "Oscillator

Stop"

on the Beat Frequency Oscillator and check the overshoot.

Overshoot:

0,1-1,1 dB

for

METER SWITCH

in

"Fast"

0,1-1,6 dB

for

METER SWITCH in

"Slow"

max 0,1 dB

for

METER SWITCH in

"Hold"X)

X)

Before "Oscillator

Stop"

is

released

for

check

of

overshoot depress

"Meter

Reset" on 2204.

Frequency: 1000Hz. Adjust the

input

voltage

for

an

8,6 dB deflection

on 2204.

Disconnect the

input

signal and measure the time

it

takes

for

the

pointer

to

decrease

from

8,6

to

0 dB.

Tolerance: 3 ± 0.5

sec.

Adjust the

input

voltage

for

10 dB deflection on 2204.

When

the

input

signal

is

disconnected the meter deflection must

not

decrease

more than 0,5 dB in one minute. (Only valid

for

2ooc

and approx.

60%

relative

humidity)

BRUEL

& KJA:R

Ncerum - Denmark

•

~:

i:

:e

'i

;j!

:i:'!-

·~~~·

1013

3.5.

Check

of

RMS

Rectifier

a.

RANGE (black):

RANGE (transp):

FILTER SWITCH:

METER SWITCH:

0

Oscilloscope

"120"

"Lin"

"Fast"

[··Vp•VRMS

1 : 2

3.6. Check

of

RMS

Indication

RANGE (black) :

"120

dB"

RANGE (transp):

"120

dB"

FILTER SWITCH:

"Lin"•

METER SWITCH:

"Slow"

2204_3-3

.69

Meter

Circuit

2204.3

valid from

Serial

No

224805

sheet

2.

:ei

JJ 2614

;:.

:!:

i:·!-

·~:·

·

1017

a.

b.

0 0

Pulse

Generator

n-----~p

ICMS

1 : 4

Depress

"Oscillator

Stop"

on 1017 and adjust output

of

1013

to

give a 7 dB deflection on ·2204.

Depress

"Oscillator

Stop"

on 1013

and

adjust

output

of

1017

to

give

a 7

-"

dB

deflection on 2204.

With

signal

from both generators the deflection on 2204 should

be 10

dB±

0,1

dB

( evt. unlinearity

of

2204 meter

scale

0,2

dB)

JJ

2614

2204

At

a

pulse

duration

of

0,1

m

Sec.

and

a ratio

of

1:2 the input voltage

to

2204 schould be adjusted

to

give

a 0,2 dB deflection.

continued

Check

the indication for various

pulse

ratio

accord

i

ng

to

following

scheme

.

RANGE

...L

~

T

VRMS

Indication

(black)

120

dB

1 :

2

1 0,2

dB

110

dB

1 :

5

2

8,1

i:IB

±o,5

dB

110dB

1:

10

3

5,6

dB ± 0,5 dB

110

dB

1 :

26

5

1,7 dB

±0,5

dB

100

dB

1 :

100

10

6

dB

±0,5

dB

100

dB

1 : 200

14

3dB

±

1 dB

-

100 dB

1 : 400

20

0

dB±

1

dB

100

dB 1 : 900

30

-3,5

dB

±1.5

dB

2204.3-3.69

BRUEL & KJJER

Ncerum - Denmark

.

·~

·

;ei

··

:·

!-

.:

i!

~

·

1013

1017

4.1.

De

-Voltages

METER

SWITCH

:

2204.4-3.69

"Rae"

Output

Amplifier

2204.4

valid from Serial

No

224805

-9

5V

SV"'

(Rec.)

AC

Out

ut

Simplified Diagram

of

Output Amplifier

ZE

0015

The

DC-voltageS

across R

810

should

be

4-5 V negativ.

If necessary change

in

value

of

R 804.

From midpoint R 818, R

819

to

ground

the

voltage should

be

approx.

60

v.

If necessary change

in

value

of

R 814 (82-120k ohm)

From midpoint R 827, R 828

to

ground

the

voltage should be approx.

60V.

If necessary change

in

value

of

R 823 (56.S2k ohm)

R823

continued

4.2.

Sensitivi~

a.

RANGE (black):

RANGE (transp):

FILTER SWITCH:

METER SWITCH:

b.

METER

SWITCH

to

4.3. Attenuator

RANGE (black):

RANGE (transp):

FILTER

SWITCH

:

METER SWITCH:

4.4. Output Impedance

RANGE (black):

RANGE (transp):

METER SWITCH:

4.5. Overload

RANGE (black):

RANGE (transp):

FILTER SWITCH:

METER

SWITCH

:

4.6. Noise and

Hum

a.

RANGE

(black) :

RANGE

(transp):

FILTER

SWITCH

:

METER SWITCH:

"120"

"Ext.Filter".

"Rec"

"Fast"

"120"

"Ext. Filter"

"Fast"

"120"

"Rec"

"120"

"Ext. Filter"

"Rec"

"120"

"Ext. Filter"

"Rec"

b.

RANGE

(transp)

to

"70"

2204.4·3.69

Input signal : 0,2

V,

1000Hz.

Output voltage on "AC Output" socket: 5 V

If

necessary adjust P 801

(XC

0332)

Connect an Oscilloscope

to

a 503, a 504

(XC

0334) and check

that

the two rectified curves are of

the

same height.

If

necessary adjust P 803

(XC

0332)

Change

th!!

signal frequency

to

70

kHz

and check

the

curves again.

If

necessary adjust

the

height by C 811.

Frequency: 1000Hz. Adjust the input voltage for an 8

dB

deflection on

2204.

Check

all

attenuator steps of

RANGE

(transparent) by comparison

to

the attenuator

of

the

Beat Frequency Oscillator.

Tolerance: 0,2

dB

(+tole

rance

of

1013, 1017: 0,2

dB)

Frequency: 1000Hz. Adjust the input voltage for an

output

voltage

of

5 V on "AC Output" socket

Load

the

"AC

Output"

with a resistor

of

1

Ok

ohm and check

that

the

output

voltage

is

not decreasing more than 0,2

dB.

Input signal: 1,4 V 1000Hz. (Corresponding

to

17

dB

above full scale

deflection).

a.

Disconnect

the

input signal by depressing "Oscillator

Stop"

on

the

Beat

Frequency Oscillator. When releasing "Oscillator

Stop"

the "Overload

Output"

should light up a few times.

b. Connect an Oscilloscope

to

"AC

Output"

socket and check

that

the signal

is

not limited.

Disconnect input signal

to

2204. During measurements 2204 should

be

in

its case and connected

to

ground.

Hum

from the

DC

converter

(2

·2,5

kHz)

and 2nd and 3rd harmonic

selectively measured max. 2,5

mV

Noise (2-40

OOOHz):

max. 14

mV

.

Hum: max.

50

mV

Noise: max. 300

mV

.

BRUEL

& KJ.lER

Nrerum

- Denmark

Input

Arnplifier

valid from

Serial

No 224805

2204.5

sheet

1.

Impedance Converter

Attenuator

Preamplifier

Overload

Indicator

5.

1.

De-voltages

METER

SWITCH

:

5.2. Sensitivity -

Reference

a.

RANGE (black):

RANGE (transp):

FILTER

SWITCH

:

METER SWITCH:

!!,

RANGE (black)

to

2204.5-3.69

P!I01 Gain

Ref.Voltage

Actj.

Simplified Diag.-.n

of

Input Amplifier

ZE

0014

"Rec"

.

~

·:

!~!

.~

:

@

·

=-

:

!

·

:

·:

·

!-

.

·~·

"120"

"Lin"

"Fast"

"Ret"

1013

1017

The midpoint

of

the

output stage

of

the preamplifier (V

305c.

V

304cl

should

be

3,54

V negative. (XC 0331)

If

necessary

ch.-.ge in

value

of

R 307 (5,6-lOk ohm)

2204

Input

signal:

Exactly 2,24 V (10

V-13

dB)

at

1000Hz.

Adjust

P301

"Gain

Adj."

for

7

dB

deflection on 2204.

Adjustment

range

for

P301: The total red

scale

area

.

Adjust reference

voltage P

901

(XC 0335)

for

a deflection

to

50 on the

red

scale

mV per N/m2. (corresponding 7 dB).

continued

E.3

. Frequency Response

RANGE (black):

RANGE (transp) :

FILTER SWITCH:

METER SWITCH :

a. RANGE (black):

RANGE (transp):

FILTER SWITCH:

METER SWITCH:

"120"

"1 2

0"

"Lin"

"Fast"

"120"

"Lin"

"Fast"

b. RANGE (black) through

all positions

5.5.

Input

Impedance

RANGE (black):

RANGE (transp):

FILTER SWITCH:

METER SWITCH:

5.6.

Outeut

lm~nce

RANGE (black) :

RANGE (transp):

FILTER SWITCH:

METER SWITCH:

5.7. Overload

RANGE (black):

FILTER SWITCH:

2204

.5·3.69

"120"

"Lin"

"Fast"

"120"

"Lin"

"Fast"

"110"

"Ext.

Filter"

Frequency:

1000

H

z.

Adjust the input voltage for an 8

dB

deflection on

2204.

Vary the frequency from 2-70

OOOHz.

Deflection

on

2204

: 7 - 9

dB

(+tolerance

of

1013, 1017: 0,5 dB)

If necessar{ the

lo

w frequency response can be corrected by adjusting

the

interrelationship between P 801 and P

802

(XC

0332)

but

in this

case check item 4.2 again. The high frequency response can be corrected

by change

in

value

of

C 404 (0.33pF)

Frequency response for Input amplifier measured

on

"Ext.Filter

In"

socket.

5-70

OOOHz

tolerance: 0

to

-0,5

dB

2-5Hz tolerance: 0

to

1

dB

The high frequency response can be corrected by change

in

value

of

C315

(82-120pF)

Frequency: 1000Hz. Adjust

the

input voltage for an 8

dB

deflection on

2204.

Check all

attenuator

steps

of

RANGE (black)

by

comparison

to

the

attenuator

of

the

Beat Frequency Oscillator.

Tolerance:±

0,2

dB

{+tolerance

of

1013, 1017: 0,2 dB)

Frequency:

1000Hz. Adjust

the

input voltage

for

a

10

dB

deflection on

2204.

Connect a 5,6 pF capacitor

in

series with

the

signal. The capacitor

should be connected near

to

the

input

of

2204.

Meter deflection: 9,3-10dB.

Frequency: 1000Hz. Adjust

the

input voltage for a

10

dB

deflection on

2204.

Connect a

500

ohm

resistor across

"Ext.

Filter

In"

socket.

Meter deflection:

9,9

-10

dB

.

Frequency:

1000Hz. Adjust

the

input voltage for an

output

voltage on

"Ext.Filter

In" socket

of

1.4 V (corresponding

to

17

dB

above 0,2

V)

a. Check with an Oscilloscope

that

the

output

voltage

is

not

visible distorted.

b. Check with an

Oscilloscope

that

the

rectified sine waves

measured across

C

310

are

of

the

same height

If

necessary adjust P

302

(XC

0331)

Disconnect

the

input signal by depressing "Oscillator

stop"

on

the

Beat Frequency Oscillator. When releasing it again

the

"Overload

Input"

should light

up

a few times.

If

necessary adjust P

303

(XC

0331)

BRUEL

& KJA:R

Noorum - Denmark

JP

0018 with a 60pF capacitor

5.8.

Noise-Hum

a.

RANGE (black):

"Ref"

RANGE (transp):

"Ref"

FILTER

SWITCH

:

"Lin."

METER

SWITCH

:

"Fast"

b.

RANGE (black) to

"60"

RANGE

(transp) to

"30"

c.

FILTER

SWITCH

to

"A"

RANGE

(transp) to

"1()"

2204.5-3.69

Input

Amplifier

2204.5

sheet 2.

valid from Serial

No

224805

2107

During noise measuremenu the input of 2204 must be shortconnected

with a 60 pF capacitor (corresponding

the

Microphone capacity) and

the

apparatus must be

in

its case and evt. connected

to

ground.

Adjust "Gain Adj." for a deflection

to

50

mV

per N/m2

Meter

deflection: max. 0 dB.

Meter deflection: max. 0

dB

..

If

the meter deflection exceeds

the

limit, check noise and hum for

Input Amplifier by measuring the

output

voltage on

"Ext

. Filter" socket.

Check hum

level

measured selectively

at

the

fundamental frequency of

the DC-converter (2-2,5 kHz) and 2nd and 3rd harmonic.

Hum: max.

40

~V

Noise: max. 20<¥V. (Measured with 2107

in

lin

2-40

OOOHzl

Output Amplifier check item 4:6

•

BRUEL

& KJ.lER

Nc:erum

- Denmark

6.1.

1OOOHz

Level

a.

RANGE

(black):

RANGE

(transp):

FILTER

SWITCH

:

METER

SWITCH:

b.

FIL

TEA

SWITCH

in

position "A-B:-(;·0"

6.2. Network Curves

a.

RANGE

(black):

RANGE

(transp):

FILTER

SWITCH

:

··

METER

SWITCH:

Weighting

NetlNork

2204.6

valid from Serial

No

224805

•

-

~

i

:

:~!

~®

JJ 2614

·

~!

·:

·

!·

,·

·}·

·

"120"

"Lin"

"Fast"

"120"

"Lin"

"Fast"

1013

1017

2204

Frequency: 1000Hz. Adjust the input voltage

to

give

exactly 8

dB

d~

flection on 2204.

Check

that

the deflection

is

8

dB±

0,1

dB

in

all

positions.

If

~

c

deflection

~s

the limits. adjust

A

B

c

D

curve by P304

curve by P305

curve by P306

curve by P307

(XC

0331)

(XC

0331)

(XC

0331)

(XC

0331)

Frequency: 1000Hz. Adjust the input voltage

to

give

8

dB

deflection on

2204.

Check

the filter

curv~

according

to

following scheme.

Curve

"A"

Curve

"B"

Curve

"C"

Curve "o"

Hz

Defl..on

RANGE

Deft. on

RANGE

Deff.on

RANGE

Deft.on

RANGE

2204

(transp.)

2204

(transp.)

2204

(transp.)

2204 (transp.)

(black)

10

-2,2-1,8

90

1,7-5,7

110

·1,6-2,4

100

120

16

·0,7-3,3 70

-2,5-1,5

100 ·2,5·1,5 120

2,5-6,5

100

120

20

7,5·9,5 70 2,8-4,8 100 0,8-2,8

120

5,4-7,4

100

120

31,5

7,6-9,6

80

·0,1•1,9 110

4,(H).

,

{)

120

·0,6-1,4

110

120

125

1,4·2.4 110

. 3,3-4,3

120 7,3-8,3

120

1,5-2,5

120

500

4,3-5,3

120

7,2-82

120 7 5-8 5

120

1k

7

9-8

1

120

7 9-81 120 7

9·81

120

7 9-8 1

120

12U

2k

8,7·9,7 120

7,4-8,4 120

7,3-8,3

120

5,5-6,5

130

4k

8,5-9,5

120

6,8-7,8 120

6,7-7,7

120 8,4-9,4

130

Sk

6,4-7,4

120 4,6·5,6

120

4,5·5,5

120 8,5-4,5

130

20k

7,7·9,7

110 5,9-7,9

110

5,8-7,8

110 ·1,1·0,9

120

2204.6-3.69

•

BROEL

&

KJ.ER

Ncerum

-

Denmark

Position

of

Components

2204.7

2204.7-3.69

V•lld

from

SerWI

No.

224806

Preamplifier

ZC

0007

Attantion Do

not

open

the

pr..nplifier

ZC

0007

un'-

it

is

strictly necessary.

After repair it

is

necessary

to

clean all.

the

parts with a micture

of

10%

metylated alcohol and

90%

Freon. When

the

circuit

is

completely dry, and clean, it should"

be

coated with a mixture of

4%

silicone oil (f.inst Wacher

WS

60) and 96% triclorethylene.

After coating

the

circuit

is

dryed

at

a temperature of 1200C for one hour and immediately remounted.

0

:::

0

u

)(

oMet

1.

::~

;::8

.~

(,J

UN

2204. 7·3.

69

3,5-L.

v

negative

Print~d

Ci

rcu

it

XC

0331

ZE

0014

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Brüel & Kjær 2204 Service Instructions Manual

Brüel & Kjær 2204 Service Instructions Manual

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