Pioneer SX-450 Bedienungsanleitung

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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).

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.

)

c).

AC voltmeter

AM signal

generator

tr@

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

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 |

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

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

0*-

f'{

TC1

l\\ t

FM signal

generator

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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.

tl'

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AC voltmeter Distortion

meter

FM signal

generator

Dummyload

Oscilloscope

MPX

signal

generator

Fig.12

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