Pioneer QX-949A Series Manuals

Pioneer QX-949A Series Manuals

Manuals and User Guides for Pioneer QX-949A Series. We have 1 Pioneer QX-949A Series manual available for free PDF download: Service Manual

Pioneer QX-949A Series Service Manual

Pioneer QX-949A Series Service Manual (70 pages)

4 Channel Stereo Receiver

Brand: Pioneer | Category: Stereo Receiver | Size: 95.39 MB

Table of Contents

Table of Contents
2
Specifications
4
Front Panel Facilities
5
About 2CH Power Boosting Switch
6
Changing Line Voltage Setting and Fuse
6
Connection Diagram
7
Block Diagram
8
Level Diagram
9
Circuit Descriptions
10
- FM Tuner Section
  10
- AM Tuner Section
  10
  - IF Amplifier and Detector
    10
  - CD-4 Demodulator Section
    12
  - Sum Signal System
    12
  - Recording and Playback of CD-4 Discs
    12
  - Difference Signal System
    13
  - AGC Amplifier
    13
  - FM Demodulator
    13
  - Synchronous Detector
    14
  - Muting Circuit
    14
  - CD-4 Indicator Circuit
    14
  - Acc
    14
  - SQ Full Logic/Rm Decoder Section
    15
  - SQ System
    15
  - Circuit Composition
    16
  - Operating Description
    17
  - Control Amplifier Circuit
    18
  - Low Frequency Control
    18
  - High Frequency Control
    18
- Power Amplifier Section
  19
- Protection Circuit
  19
Disassembly
21
- Wooden Gabinet
  21
- Bottom Plate
  21
- Front Panel
  22
  - Adjustments
    23
  - Required Measuring Instruments
    23
  - AM Section
    23
  - FM Section
    23
- FM MPX Section
  24
- Top View
  25
- Bottom View
  25
  - Power Amplifier Section
    25
    
    Dial Cord Stringing
    26
    
    Parts Locations
    27
    
    Front View
    27
    
    Rear View
    31
    
    Exploded Views
    32
    
    Packing
    36
    
    Nomenclature of Screws, Washers and Nuts
    36
    
    Example
    36
    
    Schematic Diagrams, P.C. Board Patterns and Parts Lists
    37
    
    Capacitors
    41
    
    Resistors
    41
    
    Lamps
    41
    
    Fuses
    41
    
    Tuner Assembly
    42
    
    Part List of Tuner Assembly
    44
    
    Headphone Jack Assembly
    45
    
    Power Supply Circuit B Assembly
    46
    
    Parts List of Power Supply Circuit B Assembly
    46
    
    CD-4 Assembly
    47
    
    Part List of CD-4 Assembly
    49
    
    SQ/RM Decoder Assembly
    51
    
    Protection Circuit Assembly
    54
    
    Parts List of Protection Circuit Assembly
    56
    
    Control Amplifier Assembly
    57
    
    Power Supply Circuit a Assembly
    60
    
    Switch Circuit Assembly
    63
    
    Power Amplifier Assembly
    66
    
    Parts List of Exploded Views
    68

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