Table Of Contents - Pioneer QX-949A Series Service Manual

Table of Contents

Table Of Contents2
Specifications4
Front Panel Facilities5
About 2Ch Power Boosting Switch6
Changing Line Voltage Setting And Fuse6
Connection Diagram7
Block Diagram8
Level Diagram9
Circuit Descriptions10
Fm Tuner Section10
Am Tuner Section10
If Amplifier And Detector10
Cd-4 Demodulator Section12
Sum Signal System12
Recording And Playback Of Cd-4 Discs12
Difference Signal System13
Agc Amplifier13
Fm Demodulator13
Synchronous Detector14
Muting Circuit14
Cd-4 Indicator Circuit14
Acc14
Sq Full Logic/Rm Decoder Section15
Sq System15
Circuit Composition16
Operating Description17
Control Amplifier Circuit18
Low Frequency Control18
High Frequency Control18
Power Amplifier Section19
Protection Circuit19
Relay Driving Circuit19
2-Channel Power Boosting Circuit19
Over Current And Overload Detection20
Detection Of Dc Voltage20
Disassembly21
Wooden Gabinet21
Bottom Plate21
Front Panel22
Adjustments23
Required Measuring Instruments23
Am Section23
Fm Section23
Fm Mpx Section24
Top View25
Bottom View25
Dial Cord Stringing26
Parts Locations27
Front View27
Rear View31
Exploded Views32
Packing36
Nomenclature Of Screws, Washers And Nuts36
Example36
Schematic Diagrams, P.c. Board Patterns And Parts Lists37
Capacitors41
Resistors41
Lamps41
Fuses41
Tuner Assembly42
Part List Of Tuner Assembly44
Headphone Jack Assembly45
Power Supply Circuit B Assembly46
Parts List Of Power Supply Circuit B Assembly46
Cd-4 Assembly47
Part List Of Cd-4 Assembly49
Sq/Rm Decoder Assembly51
Protection Circuit Assembly54
Parts List Of Protection Circuit Assembly56
Control Amplifier Assembly57
Power Supply Circuit A Assembly60
Switch Circuit Assembly63
Power Amplifier Assembly66
Parts List Of Exploded Views68