Pioneer QX-949A Series Bedienungsanleitung

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Glx-g49A

CONTENTS

SPECIFICATIONS 3

FRONT PANEL FACILITIES ...

CONNECTION DIAGRAM

BLOCK DIAGRAM

LEVEL DIAGRAM

CIRCUIT DESCRIPTIONS

6.1 FM Tuner Section

6.2 AM Tuner Section

6.3 CD-4 Demodulator Section

6.4 SO Full Logic/RM Decoder Section

6.5 Control Amplifier

6.6 Power Amplifier Section

6.7 Protection Circuit

DISASSEMBLY

7.1 Wooden Gabinet

7.2 Bottom Plate .

7.3 Front Panel .

ADJUSTMENTS

8.1 AM Section

8.2 FM Section

9.3 FM MPX Section

8.4 Power Amplifier Section

DIAL CORD STRINGING

PARTS LOCATIONS

10.1 Front View 1

1O.2 Front View 2

10.3 TopView ...... 37

10.4 Bottom View. 39

10.5 Rear View 41

11. EXPLODED VIEWS 43

12. PACKING 52

13. SCHEMATIC DIAGRAMS, P.C. BOARD PATTERNS AND

PARTS LISTS

13.1 Schematic Diagrams and Miscellaneous Parts . 53

'13.2 TunerAssembly(AwE-041) .... 61

10.

13.3 Headphone Jack Assembly (AWX-054) . . G7

13.4 Power Supply Circuit B Assembly (AWR-039) 68

13.5 CD-4Assembly(AWM-076) ...... 69

13.6 SO/RM Decoder Assembly (AWM-077) 77

13.7 ProtectionCircuitAssembly (AWM-079) ...... 83

13.8 Control Amplifier Assembly (AWG-023) 86

13.9 Power Supply Circuit A Assembly (AWR-080) 91

13.10 SwitchCircuitAssembly (AWS-048) ...... 94

13.11 Power Amplifier Assembly (AWH-027) gB

14. PARTS LIST OF EXPLODED VIEWS . . . . . .102

NOTE:

THE MODEL QX-949A COMES IN TWO VERSIONS DISTINGUISHED AS FOLLOWS:

Round label on

rear panel Voltage Type

KCU

110V, ]-20V,130V,220V,

and 240V (switchable)

120V only

General export model

UL (U.S.A.) and

CSA(Canada) approved

ABOUT 2CH POWER BOOSTING SWITCH

To increase available power when using the QX-949A for

2-channel reproduction, a convenient power select fea-

ture is incorporated. The covered compartment on the

rear panel houses a reversable connector panel. When

added power is desired during 2-channel operation tum

off set power. Open the cover, remove the connector

panel and rotate it 180o, then re-insert it and close the

cover. Be sure to reverse the connector again before

retuming to 4-channel operation.

These illustrations show how the boosting switch is employed.

:1 J

Pull out connector Rotate connector 180" and re-insert it

Loosen screw to open cover

CHANGING LINE VOLTAGE SETTING AND FUSE

(F MODEL)

To remove the fuse, unscrew the fuse cap located in the

center of the line voltage selector and withdraw it,

together with the fuse. Next, pull the line voltage

selector plug out of its socket, rotate it until the

cutaway aligns with the appropriate line voltage marked

on the back of the unit, then push it back into its socket.

It is important to check the rating of the fuse; a 3A

fuse should be used with either 220Y or 240V, while a

6.4 fuse should be used for 110V, 720V, or 130V

operation. If the fuse rating is correct, reinsert it and

screw in the fuse cap.

No selector plug is provided for "KCU" type (120V only

model).

PHTLLTPS

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x./

LECTOR PLUG

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5. LEVEL DIAGRAM

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. 20ll Power boosting switch is set at 40ll

.trequency at lkllz

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6. CIRCUIT DESCRIPTIONS

6.1 FM TUNER SECTION

Front End

This consists of. a 4-gang variable capacitor tuning

circuit, dual-gate MOS FET RF amplifier and

mixer, and local oscillator with buffer. By employ-

ing a glounded gate-Z of the dual-gate MOS FpT,

the circuit becomes equivalent to a cascade ampli-

fier, providing large gain with stable operation in

the RF amplifier.

In the mixer stage, the signal is applied from the

local oscillator to gate-2. This method allows input

power from the local oscillator to be minimized

and features low mutual interference. A variation

of a Clapp circuit forms the local oscillator and by

inserting a buffer amplifier between it and the

mixer, the oscillator load is reduced and waveform

distortion suppressed. The oscillation frequency

drawing effect is also eliminated, to provide

extremely stable operation even with strong inputs.

lF Amplifier and Detector

These are composed of three dual-element ceramic

filters and two integrated circuits. The first stage

IC (HA1201") incorporates a current limiter, while

the second stage IC (HA1137) is shown in Fig. 2.

When pin 12 of HA1137 is at more than xTOkHz

detuning and with an extremely low input level,

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a DC voltage is produced. By setting the FM

Muting switch to ON, pin 12 is connected to pin

5, and the analog switch in HA1137 is operated

ON-OFF to perform muting.

Multiplex Decoder

Demodulation is performed by switching detection

with the circuit contained in the IC (HA1156),

depicted in Fig. 3. A phase locked loop (PLL)

produces a 38kHz square wave synchronized to

the pilot signal. The two gates are alternately

switched ON-OFF by this signal to derive the L

and R channels from the composite signal. By

detecting the pilot signal level, the switching signal

from PLL to demodulator is operated ON-OFF.

The STEREO indicator lights at the same time.

6.2 AM TUNER SECTION

This consists of a 3-gang variable capacitor tuning

circuit, a dual element ceramic filter and an IC

(HA1138). The IC (Fig. 4) contains an RF stage

and two IF amplifier stages.

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Fis. 1

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