Fm Tuner Section; Am Tuner Section - Pioneer SX-2300 Service Manual

SX-2300/KuUc
FM TUNER SECTION
* Connect the FM signal generator (FM SG) to the FM ANTENNA 3002 terminal through a 3000 dummy antenna.
* Set the SX—2300 or SX—1300 to the FM band.
(*1) Tune the FM SG to the SX—2300/KUC or SX—1300/KUC.
(#2) Connect the FM multiplex stereo signal generator to the FM SG external modulator terminal. Set the modula-
tion to Main 1 kHz/L+R/+68.25kHz deviation. Pilot 19kHz/+6.75kHz deviation.
FM SG SX — 2300
(1kHz,+75kHz deviation) SX— 1300 Adjustment Adjustment procedure
Frequency point
No signal 87.5MHz Check DC voltage between terminal TP1(VT) and
1 ground (2.5V~4V)
98.0MHz 0 to 40 dB 98.0MHz T101 Adjust DC voltage between IC101 13 pin and ground
L107 at maximum.
98.0MHz 60dB 98.0MHz L103 Adjust DC voltage between terminal TP 3 and TP 4
to 0+50mV
98.0MHa(#1) | 6B 98.0MHz VR101 Adjust signal between TP 5(VCO) and ground
to 76kHz (within +100Hz).
no modulation
AM TUNER SECTION
MW Tuner Section
* Connect the furnished AM loop antenna between terminals AM ANTENNA and GND.
* Connect the AM signal generator (AM SG) to the AM ANTENNA terminal through a 10kf resistor.
* Set the SX—2300 or SX—1300 to the AM(MW) band.
(*3) There are 2 kinds of models in the SX—2300/SD and SX—1300/SD systems.The one is the channel step fre-
quency of 10kHz and the other is 9kHz. Accordingly, in case of model 10kHz step, the adjustment should be per-
formed by using the frequency of Item "10kHz step" and in case of model 9kHz step, the adjustment should be
performed by using the frequency of Item "9kHz step".
(*4) Tune the AM SG to the SX—2300 or SX— 1300.
Step | AM SG (400Hz,30% modulation) Adjustment procedure
SX—1300
Frequency(*3) Level Frequency display(*3)
10kHz step 10kHz step
No signal 530kHz §31kHz L102 Adjust DC voltage between terminal TP
1(VT) and ground. (1.3+0.1V)
No signal 1600kHz | 1602kHz TC101 | Adjust DC voltage between terminal TP
1(VT) and ground. (10+0.3V)
Repeat steps 1 and 2 until both specifications correct.
gz 600kHz(*4)|603kHz(+4)| 76dB | 600kHz | 603kHz | 102 | Adjust DC voltage between TP2 and
[5 | 1400kHa2(*4)}1395kHz(+4)| 76dB 1400kHz | 1395kHz TC102 | ground at maximum.
Repeat steps 4 and 5 until maximum sensitivity is attained.
7 1000kHz |999kHz(*4)/45 to 65dB| 1000kHz {| 999kHz {R161 4.7kQ| However, remove the R161(4.7kQ) from
the COMPLEX assembly if the tuning in-
dicator fails of light up at more than 65dB.
eal
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