Adjustments - Pioneer VSX-4000 Service Manual

WA-> Calele/a)s= 1. €
16. ADJUSTMENTS
16.1 TUNER SECTION
FM Tuner Section .
e¢ Connect the FM signal generator (FM SG) to the FM ANTENNA 3002 terminal through a 3002 dummy
antenna.
e Set the AUTO/MANUAL switch to the MANUAL position and the FUNCTION switch to the FM.
FM MONO ADJUSTMENT
FM SG
(1 kHzt75 kHz dev.)
Frequency
display
Adjustment
point
Adjustment procedure
Frequency
Check pin 73 (3.4+1.5V) of tuner assembly.
~ Check pin 73 (8. we ae of tuner assembly. 108.0 MHz
T401, L402 | Set the output from pin 74 of tuner assembly to
3 98 MHz 20~30 dB 98 MHz T402 maximum level.
Adjust voltage across pins 76 and 77 of tuner
assembly to T meter center. (£10 mV}
98 MHz 60 dB 98 MHz T406 Minimize distortion.
Repeat steps 4 and 5 until both specification ratings are satisfied.
FM MPX ADJUSTMENT
vR401 Adjust the frequency at pin 75 of tuner assembly
to 75.8 kHz (+100 Hz)
98 MHz 280 dB ame :
98 MHz VR402 Maximize separation.
saw 98 MHz
10 dB
Confirm that TUNER
IND and STEREO IND are
extinguished.
| _____Stereo
modulation* modulation*
9
4 98 MHz 60 dB 98 MHz T405
* Stereo modulation: Main 1 kHz L+R 68.25 kHz dev. Pilot 19 kHz+6.75 kHz dev.
AM (MW) Tuner Section we
* Connect loop antenna to the AM signal generator (AM SG). and connect the Loop antenna (of the set) to AM
ANTENNA terminal.
¢ Set the FUNCTION switch to the AM (MW)
AM SG
Step {400Hz, 30% MOD) Adjustment procedure
displa int '
1
;
531 kHz
L406 Set pin 73 of tuner assembly to 1.2V (+0.05WY
No signal
1602 kHz TC402 Set pin 73 tuner assembly to 10.0V (+0.1V)
Frequency Adjustment
Repeat steps 1 and 2 until both specification ratings are satisfied.
603 kHz 40 dB 603 kHz T404 Set the output from pin 74 of tuner assembly to
1395 kHz 40 dB 1395 kHz Tc401 maximum level.
Repeat steps 4 and 5 until both specification ratings are satisfied.
999 kHz | 55dB CS 999kHz Confirm that TUNER IND becomes lit.
¢ The distance between AM SG side loop antenna A 60 cm
and the receiver side (VSX-5000(BK)) loop antenna B,
that is, from the center of A side loop antenna to that
of Bside loop antenna should be 60 cm. eases [ia]
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