Sony RMT-V220B, Service Manual

– 4 –

Feature Difference ................................................................... 3
Service Note ............................................................................ 5

1.

GENERAL

Getting Started .............................................................. 1-1
Basic Operations ........................................................... 1-7
Additional Operations .................................................... 1-11
Additional Information ................................................... 1-14

2.

DISASSEMBLY

2-1.

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

2-2.

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

2-3.

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

2-4.

FR-127, DM-62 Board Removal ................................... 2-1

2-5.

RP-230, SE-68 Board Removal .................................... 2-2

2-6.

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

2-7.

MA-315, SR-825 Board Removal ................................. 2-2

2-8.

Internal Views ................................................................ 2-3

2-9.

Circuit Boards Location ................................................. 2-4

3.

BLOCK  DIAGRAMS

3-1.

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

3-2.

Video Block Diagram ..................................................... 3-4

3-3.

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

3-4.

I/O, C+ Block Diagram ................................................... 3-9

3-5.

Audio Block Diagram ..................................................... 3-11

3-6.

Tuner Block Diagram ..................................................... 3-13

3-7.

Mode Control Block Diagram ........................................ 3-15

3-8.

Power Block Diagram .................................................... 3-18

4.

PRINTED  WIRING  BOARDS  AND
SCHEMATIC  DIAGRAMS

4-1.

Frame Schematic Diagram ............................................ 4-1

4-2.

Printed Wiring Boards and Schematic Diagrams ......... 4-5
RP-230 Printed Wiring Board ........................................ 4-5
RP-230 Schematic Diagram ......................................... 4-7
MA-315 Printed Wiring Board ....................................... 4-10
MA-315 (Video, Audio) Schematic Diagram ................. 4-13
MA-315 (Servo/System Control) Schematic Diagram .. 4-17
MA-315 (Hi-Fi Audio) Schematic Diagram .................... 4-21
MA-315 (OSD) Schematic Diagram .............................. 4-23
MA-315 (IN/OUT) Schematic Diagram ......................... 4-25
MA-315 (Tuner) Schematic Diagram ............................ 4-28
SE-68 Printed Wiring Board and Schematic Diagram .. 4-31
DM-72, FR-127 Schematic Diagram ............................. 4-34
DM-72, FR-127 Printed Wiring Board ........................... 4-37
SR-825 Printed Wiring Board ........................................ 4-39
SR-825 Schematic Diagram ......................................... 4-41

5.

INTERFACE,  IC  PIN  FUNCTION  DESCRIPTION

5-1.

System Control-Video/RP Block Interface
(MA-315 board IC161) .................................................. 5-1

5-2.

System Control-Servo Peripheral Circuit Interface
(MA-315 board IC161) .................................................. 5-1

5-3.

System Control-Mechanism Interface
(MA-315 board IC161) .................................................. 5-2

5-4.

System Control-System control Peripheral circuit
Interface (MA-315 board IC161) ................................... 5-3

5-5.

System Control-Audio Block Interface
(MA-315 board IC161) .................................................. 5-3

5-6.

Servo/System/Tuner/Timer Control Microprocessor
Pin Function (MA-315 board IC161) ............................. 5-4

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 ......................... 7-2
2-1-6. Adjusting Sequence ................................................. 7-2

2-2.

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

2-2-1. Power Supply Check ................................................ 7-2

2-3.

Servo System Adjustment ............................................. 7-3

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

2-4.

Video System Adjustment ............................................. 7-3

2-4-1. Playback Y signal Level Check ................................ 7-3
2-4-2. Recording Chroma Level Check .............................. 7-4
2-4-3. Sync. AGC Check ..................................................... 7-4
2-4-4. X’tal Oscillation Frequency Check ........................... 7-4

2-5.

Audio System Adjustment ............................................. 7-5

2-5-1. Hi-Fi Audio System Adjustment ............................... 7-5
1.

AF Switching Position Adjustment ........................... 7-5

2.

Frequency Responce Check .................................... 7-5

3.

Overall Level Characteristic and
Distortion Factor Check ........................................... 7-6

4.

Overall S/N Check .................................................... 7-6

2-5-2. Normal Audio System Adjustment ........................... 7-6
1.

ACE Head Adjustment ............................................. 7-6

2.

E-E Output Level Check ........................................... 7-6

3.

Frequency Responce Adjustment ............................ 7-6

4.

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

5.

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

2-6.

Parts Arrangement Diagram for Adjustments ............... 7-8

8.

REPAIR  PARTS  LIST

8-1.

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

8-1-1. Front Panel and Cabinet Assemblies ....................... 8-1
8-1-2. Chassis Assembly .................................................... 8-3
8-1-3. Mechanism Chassis Assembly (1) ........................... 8-4
8-1-4. Mechanism Chassis Assembly (2) ........................... 8-5
8-1-5. Mechanism Chassis Assembly (3) ........................... 8-6

8-2.

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

TABLE  OF  CONTENTS

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