Sony str 7045 rec service manual

Page 2

£ectian

1.

Pk.

TABLE OF CONTENTS

Title Page

TECHNICAL DESCRIPTION
1-1. Specifications
1-2. Detailed Circuit Analysis .

1-3. Block Diagram
1-4. Level Diagram ..

DISASSEMBLY AND REPLACEMENT

2-1. Wooden Case, Top Cover and
Bottom Plate Removal

2-2. Front Panel Removal ....... 14
2-3.. Dial Cord Reatringing 14
2-4. Mechanical Dial Calibration 16

2-5. Dial Scale Replacement
2-6. Pilot Lamp Replacement . .
2-7. Tuning Meter Replacement . .. 17
2-8. Control and Switch Replacement l7

2-9. Rear Panel Removal .. 18
'2-10. Replacement of Components

Secured to the Rear Panel

by Nylon Rivets ................ .. 19
2-11. Power Transistor Replacement ..
2-12. Chassis Layout ................................ 20

ALIGNMENT AND ADJUSTMENT

3-1. Fm I-f Strip Alignment .................. 21
3-2. Fm Discriminator Alignment
3-3. Muting Adjustment .............
3-4i Fm Frequency Coverage

Alignment ................................... 23
3-5. Fm Stereo Separation

Adjustment ...................
3-6. A-m l-f Strip Alignment ..
3-71 A-m Frequency Coverage and

Tracking Alignment 25

Section

Title Page
3-8. Tuning Meter Calibration ...... 27
3-9. Power Amplifier Adjustment . 27
REPACKING ........................................... 30
DIAGRAMS
5-1. Wiring {or Switches ......................... 31
5-2. Mounting Diagram
- Fm l-f Amp Board - ............ 32
5-3. Mounting Diagram
- A-m Cp/l-f Amp Board - ..... 34
5-4. Mounting Diagram
- MPX Decoder Board - 36
5-5. Mounting Diagram
- Fm Front-End - 38
5-6. Schematic Diagram
- Tuner Section - 39
5-7. Schematic Diagram
- Audio Amp Section - ........... 41
5-8. Mounting Diagram
- Preamplifier Board - ............. 43
5-9. Mounting Diagram
- Loudness Control Board - 44
5-10. Mounting Diagram
- REC/PB Connector Board -...i 44
S-l 1. Mounting Diagram
-- Tone Control Board - 45
5-12. Mounting Diagram
- Power Amplifier Board a ...... 46
5-13. Mounting Diagram
'- Power Supply Board - .......... 48
EXPLODED VIEWS 50
ELECTRICAL PARTS LIST ................... 54