Pioneer TX 950 Service Manual

Page 2

9. ADJUSTMENTS

FM Tuner Section [Both TX-950 and TX-950L)

0 Connect the FM signal generator (FM 86) to the FM ANTENNA 3009 terminal through a 3009 dummy antenna.
0 Set the TX-950(L) to the FM band.

(1) Tune the FM SC to the TX-950 (L).
(2) Connect the FM multiplex stereo signal generator to the FM 86 external modulator terminal. Set the modula-

tion to Main 1kHz/L+R/ 167.5kHz deviation, Pilot 19kHZ/t7.5kHz deviation.

FM 56 rx-9so (L) .
Step (400Ha, 275kH1 devhtionlg Frequency Adwm'm Adjustment procedure
Frequency Level 9359'
. Adjustment until DC voltage between terminal no. 1 and
I 98.0MHzi 1) 20dB 98.0MHZ T101, T102 ground is maximum.
Adjust DC voltage between termmal no. 2 and no. 3 to
2 98,0MHzl'1) SGdB 98.0MH1 T201 0V (within :SDmV).
98.0MHzi'l) BGdB Adjust svgnal between terminal no 4 and
7 ___4 . ground to
3 "m modulation 98'0 '3" 76kHz (within :150Hz).
98.0MHzi'1) BGdB T102 Ad H d' . OUTP .
4 Stereo modulation("2) 98.0MHZ (within 290°) quglsy mniimsmortion at UT L and R termmal )5
(Main=1kHz, L or R)
93.0MHzi'1) 38d5 lithe STEREC Indicator and TUNED ind'
. M water are not
5 Store modulationi'2l 95 0 Hz H212 on, remove R2124

AM Tuner Section

MW Tuner Section (Both TX-950 and TX-950Li

(*3) Tune the AM SG to the TX-950(L).

Connect the furnished AM loop antenna between terminals AM ANTENNA and GND.

Connect the AM signal generator (AM 86) to the AM ANTENNA terminal through a 10k!) resistor.
Set the TX-950(L) to the AM (MW) band.
Set the AM CHANNEL STEP switch to the 9kHz position (KU, S and 5/6 types).

AM 56 rx-9so (L) .
Step (400Hz. 30% modulation) Frequency Adl':":"" Adjustment procedure
. ll

Frequency 1 Level diSPIaV po
1 No signal 531kH2 L401 1.3V DC between terminal not 5 and ground
2 No signal 1602kHz T0402 10V DC between terminal no. 5 and ground,
3 Repeat steps 1 and 2 until both specifications are correct.
4 603kHZi'3l 76dB 603kHz T401 _ j 7

Adjust until DC voltage between terminal no, 6 and

5 1395kHzi3) 76dB 1395kHz TC401 ground '5 maximum.
6 Repeat steps 4 and 5 until maximum sensitivity is attained.