SLV-ED8ME, SLV-ED8ML, SLV-EZ8AS, SLV-EZ8NZ, SLV-EZ9AS - Sony VCR Service Manual (repair manual). Page 3

Section

Title

Page

Section

Title

Page

Feature Difference ................................................................... 2
SERVICE NOTE ...................................................................... 4

1.

GENERAL

Getting Started .............................................................. 1-1
Basic Operations ........................................................... 1-9
Additional Operations .................................................... 1-13
Editing ............................................................................ 1-15
Additional Information ................................................... 1-16

2.

DISASSEMBLY

2-1.

Upper Case Removal .................................................... 2-1

2-2.

RJ-79, NK-11 Board Removal ....................................... 2-1

2-3.

Rear Panel Removal ..................................................... 2-1

2-4.

Front Panel Section Removal ....................................... 2-1

2-5.

FR-137, DM-77, SW-307, IO-64 Board
Removal (EZ9) .............................................................. 2-2

2-6.

Control Switch Block Removal (EZ9) ........................... 2-2

2-7.

FR-137, DM-77, IO-64 Board Removal (ED8/EZ8) ...... 2-2

2-8.

Mechanism Deck Removal ........................................... 2-2

2-9.

Power Block Removal ................................................... 2-3

2-10. PS-414, MA-325 board Removal .................................. 2-3
2-11. Internal Views ................................................................ 2-4
2-12. Circuit Boards Location ................................................. 2-5

3.

BLOCK  DIAGRAMS

3-1.

Overall Block Diagram .................................................. 3-1

3-2.

Video1 Block Diagram ................................................... 3-4

3-3.

Video2 Block Diagram ................................................... 3-5

3-4.

Servo/System control Block Diagram ........................... 3-7

3-5.

Audio Block Diagram ..................................................... 3-9

3-6.

Tuner Block Diagram ..................................................... 3-11

3-7.

Mode Control Block Diagram ........................................ 3-13

3-8.

Power Block Diagram .................................................... 3-15

4.

PRINTED  WIRING  BOARDS  AND
SCHEMATIC  DIAGRAMS

4-1.

Frame Schematic Diagram ........................................... 4-3

4-2.

Printed Wiring Boards and Schematic Diagrams ......... 4-5
MA-325 (Head Amp) Schematic Diagram .................... 4-5
MA-325 Printed Wiring Board ....................................... 4-9
MA-325 (Video, Audio) Schematic Diagram ................. 4-11
MA-325 (System Control) Schematic Diagram ............ 4-15
MA-325 (Servo Control) Schematic Diagram ............... 4-17
MA-325 (Bias, CTL) Schematic Diagram ..................... 4-19
MA-325 (Hi-Fi Audio) Schematic Diagram .................... 4-21
MA-325 (OSD) Schematic Diagram .............................. 4-23
MA-325 (IO) Schematic Diagram .................................. 4-25
MA-325 (Tuner) Schematic Diagram ............................ 4-27
IO-64 Printed Wiring Board and
Schematic Diagram ....................................................... 4-30
RJ-79 Printed Wiring Board and Schematic Diagram .. 4-31
NK-11 Printed Wiring Board and
Schematic Diagram ....................................................... 4-33
DM-77 Printed Wiring Board and
Schematic Diagram ....................................................... 4-35
FR-137, SW-307 Printed Wiring Boards ....................... 4-37
FR-137, SW-307 Schematic Diagram .......................... 4-39
PS-414 Printed Wiring Board ........................................ 4-41
PS-414 Schematic Diagram .......................................... 4-43
SR-718 Printed Wiring Board ....................................... 4-45
SR-718 Schematic Diagram ......................................... 4-47

5.

INTERFACE,  IC  PIN  FUNCTION  DESCRIPTION

5-1.

System Control-Video Block Interface
(MA-325 board IC161) .................................................. 5-1

5-2.

System Control-Servo Peripheral Circuit Interface
(MA-325 board IC161) .................................................. 5-1

5-3.

System Control-Mechanism Interface
(MA-325 board IC161) .................................................. 5-2

5-4.

System Control-System Control Peripheral Circuit
Interface (MA-325 board IC161) ................................... 5-3

5-5.

System Control-Hi-Fi Audio Block Interface
(MA-325 board IC161) .................................................. 5-3

5-6.

Servo/System Control Microprocessor Pin Function
(MA-325 board IC161) .................................................. 5-4

5-7.

Timer/Tuner Control Microprocessor Pin Function
(FR-137 board IC301) ................................................... 5-5

5-8.

Nicam Processor Pin Function
(NK-11 board IC1) ......................................................... 5-6

6.

ERROR  CODE

.......................................................... 6-1

7.

ADJUSTMENTS

7-1.

Mechanical Adjustments ............................................... 7-1

7-2.

Electrical Adjustments ................................................... 7-1

2-1.

Pre-Adjustment Preparations ........................................ 7-1

2-1-1. Instruments to be Used ............................................ 7-1
2-1-2. Connection ............................................................... 7-1
2-1-3. Set-up of Adjustment ................................................ 7-1
2-1-4. Alignment Tape ......................................................... 7-1
2-1-5. Specified I/O Level and Impedance ......................... 7-1
2-1-6. Adjusting Sequence ................................................. 7-2

2-2.

Power Supply Adjustment ............................................. 7-2

2-2-1. Power Supply Check ................................................ 7-2
2-2-2. +6V Adjustment ........................................................ 7-2

2-3.

Servo System Adjustment ............................................. 7-2

2-3-1. RF Switching Position Adjustment ........................... 7-2

2-4.

Audio System Adjustments ........................................... 7-3

2-4-1. Hi-Fi Audio System Adjustment ............................... 7-3
1.

AF Switching Position Adjustment ........................... 7-3

2.

Frequency Response Check .................................... 7-3

3.

Overall Level Characteristic and
Distortion Factor Check ........................................... 7-4

4.

Overall S/N Check .................................................... 7-4

2-4-2. Normal Audio System Adjustment ........................... 7-4
1.

ACE Head Adjustment ............................................. 7-4

2.

E-E Output Level Check .......................................... 7-4

3.

Frequency Responce Check .................................... 7-4

4.

Overall Level Characteristic and Distortion
Factor Check ............................................................ 7-5

5.

Overall S/N Check .................................................... 7-5

2-5.

Video System Adjustment ............................................. 7-5

2-5-1. VCO Oscillation Frequency Adjustment .................. 7-5

2-6.

Parts Arrangement Diagram for Adjustments ............... 7-6

8.

REPAIR  PARTS  LIST

8-1.

Exploded Views ............................................................. 8-1

8-1-1. Front Panel and Cabinet Assemblies

(ED8/EZ8) ................................................................ 8-1

8-1-2. Front panel and Cabinet Assemblies

(EZ9) ......................................................................... 8-2

8-1-3. Chassis Assembly .................................................... 8-3
8-1-4. Mechanism Chassis Assembly (1) ........................... 8-4
8-1-5. Mechanism Chassis Assembly (2) ........................... 8-5
8-1-6. Mechanism Chassis Assembly (3) ........................... 8-6

8-2.

Electrical Parts List ........................................................ 8-7