5.3.3
Indication
Adjust
the
mechanical
zero
of
the
meter
with
the
GC
00}
switched
off.
Adjust
the
electrical
zero
(without
AF
signal)
by
means
of
R221.
Adjust
R218
with
a
BOO—Hz
AF
signal
in
the
left
channel.
Set
the
sensitivity
switch
(320)
to
"0
dB”
and
the
indication
selector
to
”L".
Check
the
level
at
test
point
MPlO4:
should
be
+6
dEm
t0.05
dB.
Adjust
for
+6-dEm
indication
on
the
upper
scale.
Check
the
sensitivity
switch:
when
switching
from
"0
dB"
to
"+10
dB",
the
indication
must
drOp
from
+6
dEm
to
—#
dEm.
5.3.4
Channels
L
and
R
lS—kHz
lowEass
filters
Apply
a
signal
to
the
L
and
R
inputs
(EUlO
and
EUEO)
with
a
level
of
about
+6
dEm
at
the
specified
pole
frequencies
(t0.5%)
and
adjust
for
minimum
at
test
point
MP...
Pole
frequency
Left
channel
Right
channel
38.8
kHz
19.2
kHz
L106
18.1
kHz
MPIO4
L107
MPlO8
23.1
kHz
L108
/
Carrier
suggression
Measure
the
DC
voltage
(offset
on
B103
and
BlO#).
Set
link
E8101
to
"L”
and
ERlO2
to
"R";
do
not
apply
an
AF
signal.
Adjust
R135
for
O V
to'5
mV
at
test
point
MPlO4.
Adjust
R175
for
O
V
1-0.5
mV
at
test
point
MP108.
5.3.5
MPX
Lowpass
Filter
and
Output
Amplifier
MPX
lownass
filter
Open
the
link
ERIOS
and
apply
a
signal
to
ER105.M
at
the
specified
frequen-
cies
(t0.5%).
Measure
at
the
MPX
output
(EU40).
Mode:
STEREO
Adjust
L111
for
minimum
at
768
kHz
(approx.
20
X
58 kHz).
Adjust
L112
for
minimum
at
498
kHz
(approx.
13
x
38
kHz).
R
58122
—
25
