Yamaha R-50 Посібник з експлуатації - Сторінка 6
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Adiustment
locations
VB102
(vco)
Stereo
indica'
tor
Adiustment
method
Rating
or
standard
Bemarks
Step
Adiustment item
Connection
terminal
tnstrument
required
O
Connect resistor
2.2Mo
between TPs
(i9M)
and
1p6
(+12)
and force the set in
stereo mode.
@
Adiust
so
that
VCo
frequency
is
at
lgkHz
19kHz
I
lOHz
Confirm that
stereo
indi-
cator
lights
up.
After
adlust-
ing,
remove
the
FC and
2.2MA
resistor.
5
VCO adiustment
300s,
FM
ANT
TPs
-TP6
11gtvl)
(+12)
TP3
-
TP4
(19kHz)
(G)
FM
SG
fgSMHzttt<Hz
I
I
zoasp (7s.2dBf)
I
I
Unmodulated
-l
hesistor 2.2Mo
FC
T101
(ST DIST)
Less
than
-48dB
G model
only
Less
than
-35dB
Not
adiust
T101
,
when
it
is
within
specifications.
6
Stereo
distortion
confirmation
300s,
FM
ANT
REC
OUT
(TP7, TP8)
FM
SG,
SSG
'98MHz
t lkHz
I
70dBp
(75.2d8f)
I
STEREO
L,
R
I
1kHz,
100% MOD.I
Dtsr-
M,
OSC
BPF
Confirm that the
leak-
age level
of the
opposite channel
is
minimum
Less
than
26dB
7
Separation
confir-
mation
300s)
FM
ANT
REC OUT
(TP7. TP8)
FM
SG,
SSG
lsst\rHi
f
ttl'{z
I
I
zoaer,
(7s.2dBf)
|
I
STEBEO
L
or
R
I
I
rtnz, toox
rrltoo-l
bsc,
acvNlt, ePr
3000
FM
ANT
REC
OUT
(TP7, TP8)
FM
SG.
SSG
lg8MHz
t
1t<Hz
I
I
zoaep
(75.2d8f)
I
Lprlor
9%
MoD
-l
osc
ni.annnant
RPF
VRl01
(PILOT
CANCEL}
Observe
waveform on
the
OSC
and adjust
so
that
carrier
leakage
le\rel
reduced
to
minlmum
More than
34dB
I
Pilot
cancel
adlustment
Confirm that the
auxiliary
center meter
points
to
0 at
tuned the
signal
of
FM
SG
lf it
is
not
points
to
0,
start
allover
from
step 2.
I
Discriminator
balance
confirma'
tion
.
Tfi
-TP2
(S
out)(NVcc)
300s,
FM
ANT
Auxiliary
cente meter
FM
SG
l-98MHz
i lkHz
I
l-roac,
t-15-2dBfll
VR103
(FM FINE)
By shorting TEST
terminals, the
counter
shifts
by
one
digit,
then
adiust
so
that
the
lowest effective
digit
comes
to
I
or 0.
r-This
figure
I
-8O.O
g8.0MHz-1*79
E
When
shifting
After
adiust-
ing, open the
TEST
termi-
nals.
10
lf
offset adiust'
ment
300a
FM
ANT
TEST
termi-
nals
(K4, T6)
FM
SG
[98MHztlkHz
I
[zoaeu
(75.2d8f)
-]
Short
TUNING
SW
+UP
or
DOWN
Confirm
that
auto
search
recePtion
is
possible
with
the
tun'
ing
button.
Confirm
that
muting
is
performed
at
auto
recep-
tion.
11
Auto
search
reception
confir-
mation
3000
FM
ANT
FM
SG
[9BMHz
t
t
tHz
lzoaar
l25.2dBtl
I
ruoNo
t
tgz
Irooga
moo
J
J
2.
AM TUNER
SECTION
oConnect the AM dummy
antenna
for
adiustment'
oWhen once
the test
terminals
are
shorted
in
adjusting
FfU,
tt',.
frequency
of
630kHz, 1440kHz'
-and
1080
tH, it
memo;ied at
each
AM
preset
position
1'
2 and
3'
J
Adlustmenl
locations
PRESET
P1
P2
P3
Adiustment
maftod
Rating.or
$andard
Remarks
Step
Adjustment item
Connection
terminal
lnstrument
required
Confirm the maximum
sensitivitY
less
than
55dB,r
1
SensitivitY
confir'
mation
AM
ANT
BEC
OUT
(TP7, TP8)
DST.
M
ACVM
AM
dummY antenna
AM
SG
l-1O8OkHz
t
0.1
kHzl
fsoaar
]
PRESET
P3
Signal O
Confirm
that all
signal
O
indicators
light.
Confirm that
all
signal
O
indicators
goes
out
at
detuned
point.
2
Sign'al
O
indica'
tor
confirmation
AM
ANT
TUNING
SW
+UP
or
DOWN
Confirm that auto
search
recePtion
is
possible
with
the
tunning
button.
3
Auto
search
rqception
confir'
mation
AM
ANT
AM
dummY antenna
AM
SG
[1
oSokHz
i
0.1
kHz
I
[ooaar
]