Pioneer SX-450 User manual

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? 9. ADJUSTMENT
9.1 AM SECTION
1. Through a 1k ohm resistor,connect an AM
signal generator to the AM antenna terminal.
Setfor 40OHz
at 100dB and3O%
modulation.
2 Connect AC voltmeter to TAPE REC iack
(L or R).
Set FUNCTION switch to AM position.
Set AM signal generator and SX-450 dial in-
dication to point A (600kHz).
Adjust T6 for maximum indication on AC
voltmeter.
Set AM signalgenerator
and SX-450 dial in-
dication
to point C (1,400kH2).
4.
sx-450
7. Adjust TC4 for maximum indication on AC
voltmeter.
8. Again set AM signalgeneratorand SX-450 dial
indication to point A.
9. Adjust bar antenna core for maximum in-
dication on AC voltmeter.
10. Return AM signal generator
and SX-450 dial
indication to point C.
11. Adjust TC5 for maximum indication on AC
voltmeter.
12. Repeat steps 4-11 to eliminate variationsin
AC voltmeter indications
at noint A and C.
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AC voltmeter
AM signal
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9.2 FM
SECTION
1. Through 300 ohm dummy antenna, connect
FM signal generator to the 300 ohm FM
antenna
terminals
and set for 4OOHz
at 100dB
and IO0% modulation.
2. Connect
AC voltmeter and distortion meter
to
TAPE REC jack (L or R).
3. Set FUNCTION switch to FM and MUTING
switch to OFF.
4. Set FM signal generator and SX-450 dial
indication to point A (90MHz).
5. Adjust T3 for maximum indication on AC
voltmeter.
6. Adjust T5 lower core for center of scale
indication on AM/FM meter.
7. Set FM signal generator for 9dB output and
adjust T1 and T2 for maximum indication on
AC voltmeter.
8. Set FM signal generator and SX-450 dial
indication
to point C (106MHz).
9. Adjust TC3, then TC1 and TC2 for *u"i*rr- A |
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indication on AC voltmeter.
10.Again set FM signal generator
and SX-450
dial
indication to point A.
11. Adjust T3, then T1 and T2 for maximum
indication on AC voltmeter.
12. Repeat steps 8-11 to eliminate variations
in
sensitivity at points A and C.
13. Adjust "t4 for maximum sensitivity.
14.Detuneto noise
only andadjust
T5 lowercore
for center of scale
indication on FM meter.
15. SetSX-450dial indication
to point B (98MHz)
and adjust FM signal generator for center of
scaleindication on AM/FM meter.
16.Set FM signal generator
output to 60dB and
adjust T5 upper corefor minimum distortion.
17.Repeatsteps
14-16eliminate
variationin mini- J" 'a
mum distortion position. tl
ACvoltmeter Distortion
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T1
TC1
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FM signal
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9.3 MPX SECTION
1.Through 300 ohm dummy antenna, connect
FM signal generator to 300 ohm FM antenna
terminals.
2. Connect multiplex signal generator to extemal
modulation terminals of FM signal generator.
3.Connect oscilloscope
horizontal input to MPX
signal pilot output and vertical input via probe
to TP (No. 13) of circuit board.
sx-450
4. SetSX-450dial indicationto 98MHzandadjust
FM signal generator for center of scale indi-
cation on AM/FM meter.
5. With FM signal generator unmodulated, adjust
VR1 so that lissajous
pattern on oscilloscope
becomes
stationaryas shown in Fig.12.
6. With MPX signal generator modulation lkHz,
L + R 67.5kHz deviation and pilot 7.5kHz
deviation, adjust T4 for minimum distortion.
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AC voltmeter Distortion meter
FM signal
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Dummyload
Oscilloscope
MPX
signal
generator
Fig.12

9.4 POWER
AMPLIFIER
SECTION
(IDLE
CURRENT}
1. Set BASS and TREBLE controls ro center a r''
position.
2. Nothing should be connected to the INPUT
jacks of SX-450 and an 8 ohm dummy load
should be connected across the SPEAKER
terminal.
3.A DC voltmeter should be connect across
between terminal number 19 1+;, 20 (-) for
Left channel and 18 1+1,l7 (-) for Right
channel.
4. Cut the jumper lead, if the voltage lessthan
15mV.
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)10. DrAL
CORDSTRTNGTNG
Remove
the Front panel
(See
page
14, 15).
1.Turn tuning drum fully clockwise (as viewed
from X direction in Fig.13).
2.Tie one end of cord to stud on inner sectionof
tuning drum (more easily performed by loosen-
ing setscrewand temporarily removing tuning
drum from shaft).
3.Passcord through pulley opening, make a half
tum around the pulley, then route in the
sequence:
pulley A-Dial needle-pulleyB-C.
4.Wind cord clockwise(as
viewed from rear panel)
3 turns around dial shaft,then route to pulley D.
5.Wind 3 tums around dial pulley and tie to spring
so that the cord is under tention.
1 6.Turn TUNING knob and confirm normal cord-
motion. then trim off excess
cord.
I
t 7.With tuning capacitorblades
fully closed, move
' dial needleto starting
point (left edge
of scale).
8.Apply laquor to tied ends of cord.
Spring
hook
Tie to springhook
sx-450
DIAL NEEDLE INSTALLATIONCAUTION
Metal portion of dial pointer is plated.
If this section is touched directly by hand or
fingerprints and other impurities, it isdifficult to
remove dirt from aventurine finish. As this isnot
desirable in terms of both appearanceand anti-
corrosion, take exteme care not to touch the
metal section when handling the dial needle.
Dial needle
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Pulley
C
End: Stud
Start: Fasten
on end of the cord to start Fis.13
Pulley
D
Tuning
drum
Dial shaft
29