BROEL & KJ.lER
Ncerum
- Denmark
DA
0042
GV0765---~~
3.
1.
Writing System
Cleaning
Adjustment
of
dB
scale
:
3.2.
Magnet System
Removal
of
the
Magnet system
Coil Resistance
10.75
Mechanical Section
2307.3
VS
0230
{\
I
I
'tV
3263
(\
I I
I I
I
~YS
0492
Remove
pen
and paper.
{
OD
0093
YO
0335
YO
0307
YN
0032
--l~----DC
0124
EJolf--t----7---DB
1457
~----
GU
0545
~-~~~,-------
GU
OMS
t--'t'Q
1172
With a soft cloth and trichlorethylene remove any
wax
or
waster matter
from
writing
plate and
bottom
plate GU
0545
.
Also clean the guide bar
DA
0042
.
Set stylus to
the
position 0 dB an
the
paper and
adjust
the
screw
JS
0369
for
a correspond-
ing reading on
the
metallic
scale.
Note: Under
no
circumstances should
oil
be
applied
to
the
writing
system.
blue/brown
violet
white/green
ye
How
/9
I"Hn
system
Remove the
writing
Potentiometer.
Disconnect the mechanical connection between the magnet system and the
writing
system.
Move the drawbar
so
far
to
the
left
side
as
possible.
Place
the instrument
with
the
bottom
upward.
Remove the
bottom
plate and the back plate.
Unsolder the five wires A - B -
C - D -
E.
Unscrew the six 5
mm
screws F.
Loosen the
four
6
mm
nuts G.
The magnet system
can
now
be
removed.
The assembling should take place in the reverse order.
Resistance in the coil: Driver coil : approx. 27
n
Feedback
coil:
approx. 1
kn
Note: Under no circumstances should
oil
be
applied
to
the magnet system .
Valid
from
serial no 377302
3-1
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