Pioneer qx 4000 service manual

Page 1

Seruice Manua/

4-CHANNEL RECEIVER

GX-4OOO/KLuw, FW

NOTE:
MODEL QX-4000 COMES IN TWO VERSIONS DISTINGUISHED
AS FOLLOWS:
Round label on rear
panel Voltage
KLUW 120V only
FW 5~position selector

PIONEEIT

Page 2

91:590.

10.

GX-4DDO

CONTENTS
SPECIFICATIONS .......................... ' ........... 3
FRONT PANEL FACILITIES ........................... 5
CONNECTION DIAGRAM ............................... 7
BLOCK DIAGRAM ..................................... 9
CIRCUIT DESCRIPTION
5.1 RF circuitry ........................................ 11
5.2 Audio circuitry ....................................... 11
5.3 Power supply circuit ................................... 12
5.4 Decoder circuit ...................................... 12
DISASSEMBLY ........................................ 13
PARTS AND PCB LOCATION
7.1 Top view .......................................... 14
7.2 Bottom View ........................................ 14
DIAL CORD STRINGING ................................ 15
ALIGNMENT PROCEDURE
9.1 FM/AM IF alignment .................................. 16
9,2 FM/AM tracking alignment .............................. 17
9.3 MPX decoder alignment ................................ 17
9.4 Other alignments ..................................... 18
SCHEMATIC DIAGRAMS, PCB PATTERNS AND
PARTS LISTS
10.1 Unit connection diagram , exproded View and miscellaneous parts list . . . 19
10.2 Tuner unit ......................................... 27
10.3 Head amp unit ...................................... 33
10.4 Control amp unit ..................................... 35
10.5 Main amp unit ...................................... 39
10.6 Decoder unit ........................................ 43
10.7 Power supply unit .................................... 43
10.8 Switch unit ................. . ........................ 50