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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
TP1
NULL terminal
=
Procedure :
1.
2s
Tune the set to 983MHz.
Adjust T21 and T22 (AV1010 only) for 0V reading on the
VOM.
FM discriminator adjustment.
FM RF stereo signal
generator
Carrier frequency : 98MHz
Output level: 25dBu
Procedure:
1. Tune the set to 983MHz.
2.
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
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