Sony STR-AV280L - Page 9

FM SECTION
FM Stereo Separation Adjustment
Procedure:
FM rf stereo
signal
generator
ANTENNA 752 REC OUT
terminals
Carrier frequency: 98MHz
Output level: ImV (60dB)
Modulation
Audio 400Hz: 16.25kHz deviation (45%)
Sub channel 38kHz: 16.25kHz deviation (45%)
Pilot signal 19kHz: 7.5kHz deviation (10%)
FM stereo
signal
generator
VTVM
VTVM
output
channel
connection
reading
(dB)
L-CH ®
Adjust
RV202 for
minimum
reading.
©
©
Adjust
RV202 for
minimum
reading.
.L-CH Stereo separation: (A) —
R-CH Stereo separation: © -@
The separations ef both channels should be
equal.
STR-AV280OL
_STR-AV280L
FM Discriminator Alignment 1
Setting:
TP
_9 | (NULL check)
TP (NULL check)
T202
(secondary side)
T201
(primary side)
e Repeat
several
tracking
the trin.
Procedure:
1. Tune the set in the strong station-signal.
2. Adjust the black core (primary-side) of T201 for
OV reading on VOM.
Note: When replacing the ceramic filter, perform this align-
ment.
FM Discriminator Alignment 2
Setting:
FM rf signal distortion
generator meter
ANTENNA 752. REC OUT
terminals
Carrier frequency: 98MHz
Modulation: 400Hz, 40kHz deviation
; (100%)
Output level: 10uV (20dB)
740:
TT cis.
Procedure:
Adjust the white core (secondary side) of T202 for
minimim distortion.
Note: When replacing the ceramic filter, perform this align-
ment.
Repeat the secondary-side and primary-side alignments
several times.