Sony STR-AV880 - Page 24

STR-AV880 STR-AV88&O
S|
FM Stereo Separation Adjustment Procedure:
Tune the set to 98 MHz. FM AGC Adjustment
Setting:
FM IF switch: WIDE FM stereo VTVM VTVM
signal generator ‘
Bee heiakes a channel connection reading (dB)
Setting:
CIRCUIT BOARDS LOCATION
signal i j
generator L-CH L-CH @®
FM rf stereo
signal
generator VTVM
®)
R-CH Adjust RT151 for outlet board
minimum reading.
R-CH 1C-L board
AC SW board
display board
ANTENNA REC OUT L-CH
FM ANT (75 9)
Adjust RT151 for
minimum reading.
ANTENNA REC OUT
L-CH Stereo separation: @® _ FM ANT (75 Q)
R-CH Stereo separation: © - (©)
Carrier frequency: 98 MHz .
Output passe A 1 mV (60 aB) Carrier frequency: 98 MHz
Modulation: Output level: 100 mV (80 dB}
Audio
1
kHz:
33.75
kHz
deviation
(45%)
The
separations
of
both
channels
should
be
equal.
Modulation:
a
hebanhons
board
Sub
channel
38
kHz:
33.75
kHz
deviation
(45%)
#
ue
a,
Bere:
eS
2
jes
aia
pr
Pea
FOR
eseen
OR)
Pilot
signal
19
kHz:
7.5
kHz
deviation
(10%)
front
jack
board
io
Mode:
stereo
tone (A)
board
[MAIN
BOARD]
Procedure:
)
1.
Turn
the
set
to
98 MHz.
2. Adjust RT141 so that the AGC voltage goes down.
distortion
meter
Cr] |
Se
eee)
ANTENNA REC OUT
FM (75
id
75 kHz deviation
60 dB)
test point
(NULL
CHECK)
FM
Auto
Stop
Level
Adjustment
vom
Setting:
(DC
range)
FM
rf
stereo
signal
generator
ANTENNA
FM (75 Q)
'
FM Signal Level Adjustment
7 :
:
Carrier
frequency:
98
MHz
side)
for
0
V
reading
on
the
Setting:
Carrier
frequency:
98
MHz
Output
level:
70
pV
(20
dB)
scindat
Maceige
eorgiad
facie
NULL
itch:
Output
level:
1
mV
(60
aB)
Modulation
EM
TP
ewiteh::
NORMAL
Modulation:
Audio
1
kHz:
33.75
kHz
deviation
(45%)
y-side)
for
a
minimum
read-
METER
SELECT
switch:
SIGNAL
LEVEL
Audio
1
kHz:
33.75
kHz
deviation
(45%)
Sub
channel
38
kHz:
33.75
kHz
deviation
(45%)
Sub channel 38 kHz: 33.75 kHz deviation (45%) Pilot signal 19 kHz: 7.5 kHz deviation (10%)
eter.
FM
cf
stereo
Pilot
signal
19
kHz:
7.5
kHz
deviation
(10%)
Mode:
stereo
Se
teate
sh
MONDO
Distortion
pe
VTVM
Mode:
stereo
Procedure:
1. Tune the set to 98 MHz.
2. Adjust RT101 so that the STEREO indicater goes
on,
le and secondary-side align- Procedure:
1. Tune the set to 98 MHz.
2. Adjust RT102 so that the signal level indicator is
70.
ramic filter, perform this align-
ANTENNA REC OUT
FM ANT (75 Q)
Ph ee | | a6