Sony STR-D2010 - Electrical Adjustments

STR-D2010
SECTION 2
ELECTRICAL ADJUSTMENTS
FM SECTION
e FM Discriminator (NULL) Adjustment
Setting:
FM RF stereo signal
generator
Carrier frequency : 98MHz
Output level: 60dBu
Modulation : 1kHz
FM ANTENNA 3000
75kHz
dev.
terminal
(100%)
VOM
(DC
range)
TP1
NULL terminal
=
Procedure :
1.
2s
Tune the set to 983MHz.
Adjust
T21
and
T22
(AV1010
only)
for
0V
reading
on
the
VOM.
Note
:
FM
Tuning
Level
adjustment
should
be
made
after
FM discriminator adjustment.
e
FM
Stereo
Operation
Level
Adjustment
Setting:
FM RF stereo signal
generator
Carrier frequency : 98MHz
Output level: 25dBu
Modulation
:
1kHz
FM
ANTENNA
3000.
75kHz
dev.
terminal
(100%)
Procedure:
1. Tune the set to 983MHz.
2.
Adjust
RV24
so
that
the
STEREO
LED
goes
on.
Note on Ceramic Filter (CF1, 2 and 3) Replacement.
This set employs two ceramic filters (CF1, 2 and 3) which
should have the same color marking to identify their center
frequency. Therefore FM IF offset adjustment by D322, D325
mounted is necessary to match the center frequency of the
ceramic filters used with FM intermediate frequency.
color marking
lA
(CFI, 2 and 3)
eFM Stereo Separation Adjustment
Setting :
FM RF stereo
signal
generator
FM ANTENNA 3000. REC OUT
terminal
Carrier frequency : 98MHz
Output level: 60dBu
Modulation :
Audio (1kHz): 33.75kHz dev. (45%)
Pilot (19kHz): 7.5kHz dev. (10%)
Sub-channel (38kHz): 33.75kHz dev. (45%)
Procedure :
Tune the set to 98MHz.
FM stereo
signal generator
output channel
VTVM VTVM
connection reading (dB)
®
Adjust RV21 for
minimum reading.
Adjust RV21 for
minimum reading.
L-CH Stereo separation: @-®
R-CH Stereo separation: O-O
The separations of both channels should be equal.
©.: Mounted
xX : not Mounted
FM intermediate
4 frequency
Color |Center frequency||IF—50k|IF+50k (MHz)
(D322))(D325)
Ceramic filter Mount
10.750
10.700
10.650