Sony DSR-20MD,DSR-20MDP Service Manual

MICROFILM

SERVICE MANUAL

US Model

Canadian Model

DSR-20MD

AEP Model

Australian Model

New Zealand Model

DSR-20MDP

DIGITAL VIDEO CASSETTE RECORDER

SPECIFICATIONS

Photo: DSR-20MD

– Continued on next page –

RMT-DS20

DSR-20MD/20MDP

E MECHANISM

Ver. 1.1 2007.05

– 2 –

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!

LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE 0
SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE
DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ
DE FONCTIONNEMENT. NE REMPLACER CES COM­POSANTS QUE PAR DES PIÈCES SONY DONT LES
NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED
LINE WITH MARK 0 ON THE SCHEMATIC DIA GRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANU AL OR IN SUPPLEMENTS PUB­LISHED BY SONY.

– 3 –

LEAKAGE TEST

The AC leakage from any exposed metal part to earth ground
and from all exposed metal parts to any exposed metal part having
a return to chassis, must not exceed 0.5 mA (500 microamperes).
Leakage current can be measured by any one of three methods.

1. A commercial leakage tester, such as the Simpson 229 or RCA

WT -540A. Follow the manufacturers' instructions to use these

instruments.

2. A battery-operated A C milliammeter . The Data Precision 245

digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of a

VOM or battery-operated AC voltmeter. The “limit” indica-

tion is 0.75V, so analog meters must have an accurate low-

voltage scale. The Simpson 250 and Sanwa SH-63Tr d are ex-

amples of a passive VOM that is suitable. Nearly all battery

operated digital multimeters that have a 2V A C range are suit-

able. (See Fig. A)

Fig. A Using AC voltmeter to check AC leakage

1.5 k

Ω

0.15 µF

AC
Voltmeter
(0.75 V)

To Exposed Metal
Parts on Set

Earth Ground

1. Check the area of your repair for unsoldered or poorly-sol­dered connections. Check the entire board surface for solder
splashes and bridges.

2. Check the interboard wiring to ensure that no wires are
“pinched” or contact high-wattage resistors.

3. Look for unauthorized replacement parts, particularly transis­tors, that were installed during a previous repair. Point them
out to the customer and recommend their replacement.

4. Look for parts which, though functioning, show obvious signs
of deterioration. Point them out to the customer and recom­mend their replacement.

5. Check the line cord for cracks and abrasion. Recommend the
replacement of any such line cord to the customer.

6. Check the B+ voltage to see it is at the values specified.

7. Check the antenna terminals, metal trim, “metallized” knobs,
screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.

SAFETY CHECK-OUT

(US Model only)

After correcting the original service problem, perform the following
safety checks before releasing the set to the customer:

– 4 –

SERVICE NOTE

• Note for Repair

Make sure that the flat cable and flexible board are not cracked or bent at the terminal.
Do not insert the cable insufficiently nor crookedly.

Cut and remove the part of gilt
which comes off at the point.
(Take care that there are some
pieces of gilt left inside)

– 5 –

SERVICE NOTE .................................................................... 4

1. GENERAL

Features................................................................................ 1-1

Notes on Video Cassettes..................................................... 1-1

Notes on Recording /Playback.............................................. 1-1

Location and Function of Parts ......................................... 1-2

Playback ............................................................................... 1-4

Connections for Playback...................................................... 1-4

Settings for Playback............................................................. 1-4

Playback Procedure .............................................................. 1-4

Playback Functions ............................................................... 1-5

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

Connections for Recording.................................................... 1-6

Settings for Recording........................................................... 1-7

Recording Procedure ............................................................ 1-7

Changing Menu Settings .................................................... 1-8

Changing the SET UP MENU Settings ................................. 1-8

Menu Contents ...................................................................... 1-8

Alarm Messages .................................................................. 1-9

Troubleshooting................................................................... 1-9

Notes on Use........................................................................ 1-9

2. DISASSEMBLY

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

2-2. Removal of Front Panel Assembly .............................. 2-1

2-3. Removal of VA-102 Board ........................................... 2-1

2-4. Removal of Power Block ............................................. 2-1

2-5. Removal of MD Block Assembly ................................. 2-2

2-6. Removal of CM-56 Board............................................ 2-2

2-7. Removal of JC-19 Board ............................................. 2-2

2-8. Removal of RP-228 Board .......................................... 2-2

2-9. Circuit Boards Location ............................................... 2-3

3. BLOCK DIAGRAMS

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

3-2. Overall Block Diagram 2 ............................................. 3-3

3-3. Overall Block Diagram 3 ............................................. 3-5

3-4. Overall Block Diagram 4 ............................................. 3-7

3-5. Overall Block Diagram 5 ............................................. 3-9

3-6. Overall Block Diagram 6 ............................................. 3-11

4. PRINTED WIRING BOARDS AND

SCHEMATIC DIAGRAMS

4-1. Frame Schematic Diagrams ....................................... 4-3

• Frame (1/2) Schematic Diagram............................ 4-3

• Frame (2/2) Schematic Diagram............................ 4-5

4-2. Printed Wiring Boards and Schematic Diagrams ....... 4-7

• RP-228 Printed Wiring Board ................................ 4-7

• RP-228 Schematic Diagram .................................. 4-11

• JC-19 Printed Wiring Board ................................... 4-15

• JC-19 (AD/DA CONVERTER)

Schematic Diagram ................................................ 4-19

• JC-19 (S1 AFC) Schematic Diagram..................... 4-23

• JC-19 (U1) Schematic Diagram............................. 4-27

• JC-19 (D1) Schematic Diagram............................. 4-31

• JC-19 (C1 SPCON) Schematic Diagram............... 4-35

• JC-19 (MODE) Schematic Diagram....................... 4-39

• JC-19 (DV IN/OUT) Schematic Diagram ............... 4-43

• JC-19 (AUDIO CORE) Schematic Diagram .......... 4-47

• JC-19 (DIGITAL AUDIO) Schematic Diagram ....... 4-49

• JC-19 (AUDIO D/A, A/D CONVERTER)

Schematic Diagram................................................ 4-53

• RE-32 Printed Wiring Board .................................. 4-55

• RE-32 Schematic Diagram .................................... 4-57

• VA-102 Printed Wiring Board................................. 4-59

• VA-102 (IF) Schematic Diagram............................ 4-63

• VA-102 (VIDEO IN) Schematic Diagram ............... 4-65

• VA-102 (VIDEO OUT) Schematic Diagram ........... 4-69

• VA-102 (UVIC & DV IN/OUT) Schematic Diagram 4-73

• VA-102 (MONITOR OUT) Schematic Diagram ..... 4-75

• VA-102 (AUDIO) Schematic Diagram.................... 4-77

• VA-102 (HI MICOM) Schematic Diagram .............. 4-81

• RS-78 Printed Wiring Board .................................. 4-85

• RS-78, VA-102 (RS MICOM)

Schematic Diagram................................................ 4-87

• MD-63, MD-64, MD-65, FP-406

Printed Wiring Boards ............................................ 4-89

• MD-63, MD-64, MD-65, FP-406

Schematic Diagram................................................ 4-91

• HP-100 Printed Wiring Board ................................ 4-93

• HP-100 Schematic Diagram .................................. 4-95

• CM-56 Printed Wiring Board .................................. 4-97

• CM-56 Schematic Diagram.................................... 4-101

• FR-136 Printed Wiring Board................................. 4-105

• FR-136 Schematic Diagram................................... 4-107

• HG-1 Printed Wiring Board .................................... 4-109

• HG-1 Schematic Diagram ...................................... 4-109

• U-1 Printed Wiring Board ....................................... 4-111

• U-1 Schematic Diagram ......................................... 4-113

• U-2 Printed Wiring Board ....................................... 4-115

• U-2 Schematic Diagram ......................................... 4-117

4-3. Waveforms .................................................................. 4-119

4-4. Printed Parts Location................................................. 4-125

5. ADJUSTMENTS

5-1. MECHANICAL SECTION ADJUSTMENTS................ 5-1

5-1-1. Information ............................................................. 5-1

1-1. How to Search Reference Pages for Removal ........... 5-1

1-2. Phase Adjustment Mark “ PH- ” .................................. 5-1

5-1-2. Preparation for Mechanical Check,

Adjustment and Maintenance ................................ 5-2

2-1. FL Block Assembly................................................. 5-2

2-2. Cassette Positions.................................................. 5-2

2-3. Loading/Unloading ................................................. 5-3

2-4. Manual Up/Down the FL Block .............................. 5-3

2-5. Service Jigs List ..................................................... 5-4

5-1-3. Phase Adjustments ................................................ 5-6

3-1. Phase Adjustment

(Loading/Unloading Driving Section) ..................... 5-6

3-2. Phase Adjustment

(S/L Cassette Selection Section)........................... 5-8

3-3. Phase Adjustment

(Mechanism Chassis Upper Surface Parts) .......... 5-10

5-1-4. Periodic Check and Maintenance.......................... 5-12

4-1. Cleaning of Rotary Drum Assembly ...................... 5-12

4-2. Cleaning of Tape Path System............................... 5-12

4-3. Periodic Checks ..................................................... 5-13

5-1-5. Mechanism Section Checks and Replacements... 5-14
5-1. Tape Stopper, Motor FPC Assembly and

Elastic Connector ................................................... 5-14

5-2. Drum Assembly and Drum Base ........................... 5-14

5-3. LM Cover, LM Worm Wheel, LM Holder and

LM Motor Assembly ............................................... 5-15

5-4. TG3/4 Catcher Block Assembly,

Pinch Driving Gear and TC Arm Assembly ........... 5-15

5-5. Pinch Arm Assembly, Pinch Limiter and

Tension Coil Spring (Pinch) ................................... 5-16

5-6. HC Arm, HC Roller Assembly,

Pinch Retainer, Pinch Cam Gear and

TG5/6 Catcher Block Assembly............................. 5-16

5-7. RL Arm and RL Link............................................... 5-17

5-8. Gooseneck Guard and Gooseneck Arm Assembly 5-17
5-9. Tension Coil Spring (TG2), Spring Adjustor,

TG2 Spring Hook, TG2 Selection Arm and Damper

Sheet ...................................................................... 5-18

5-10. Tension Coil Spr ing (TG7), Spring Adjustor and

TG7 Spring Hook ................................................... 5-18

TABLE OF CONTENTS

Section Title Page Section Title Page

– 6 –

Section Title Page Section Title Page

5-11. TG2 Retainer, TG2 Arm Assembly (TG2 Plate Spring

and ET Magnet), S Tension Regulator Band Assembly

and TG2 Load Arm Assembly ................................ 5-19

5-12. TG7 Retainer, TG7 Arm Assembly (TG7 Plate Spring

and ET Magnet), T Tension Regulator Band Assembly

and TG7 Load Arm Assembly ................................ 5-20

5-13. S Reel Table Block Assembly ................................ 5-21

5-14. T Reel Holder and T Reel Table Block Assembly .. 5-22

5-15. S Reel Plate Assembly ........................................... 5-22

5-16. T Reel Plate Assembly........................................... 5-24

5-17. TG1/8 Base Assembly, S Brake and T Ratchet..... 5-25

5-18 TG3/6 Roller Assembly and TG3/6 Lock Spring.... 5-26

5-19. FL Joint Gear, TG5/6 Retainer and

Capstan Motor........................................................ 5-26

5-20. FL Selection Arm, FL Relay Gear and FL Joint Arm

Assembly ................................................................ 5-27

5-21. Rotary Switch, TC Gear and Relay Gear .............. 5-27

5-22. GL Arm Retainer and GL Arm ............................... 5-28

5-23. M Slider and M Slider Arm ..................................... 5-28

5-24. TG7 Selection Arm, TG7 Cam Gear and

T Cam Gear............................................................ 5-28

5-25. Main Cam, TG2 SL Arm Assembly and

Tension Coil Spring (TG2 SL) ................................ 5-29

5-26. TG3/4 Arm Block Assembly (TG3/4 Arm Assembly,

TG3/4 Limiter Spring and TG3/4 Gear), TG3/4 Base

Block Assembly (TG3/4 Base Assembly) .............. 5-30

5-27. TG5/6 Arm Block Assembly (TG5/6 Arm Assembly,

TG5/6 Limiter Spring and TG5/6 Gear), TG5/6

Base Block Assembly (TG5/6 Base Assembly)..... 5-32

5-28. Reel Motor.............................................................. 5-34

5-29. RS Arm Assembly .................................................. 5-34

5-30. RS Gear Assembly, Mic Press Spring and

Mic Lever ................................................................ 5-34

5-31. Rack Joint Gear, Rack Holder, Mic Holder,

Rack (LC) and Rack (SC) ...................................... 5-35

5-32. Plate Link Assembly............................................... 5-36

5-33. Roller Shaft Assembly and Roller Belt ................... 5-38

5-34. Lid Opener.............................................................. 5-39

5-35. C Door .................................................................... 5-40

5-36. Damper Arm and Tension Spring (DB) .................. 5-40

5-37. Gear (A), Gear (B), and C Worm ........................... 5-40

5-38. Tension Coil Spr ing (HS), Tension (DB), Shift Plate

Spring and C Sloat Block Assembly ...................... 5-41

5-1-6. Adjustments and Checks ....................................... 5-42

6-1. Adjustment Position ............................................... 5-42

6-2. Adjustment Order ................................................... 5-43

6-3. Adjustment and Checking Method......................... 5-44

6-3-1. Reel Table Height Adjustment................................ 5-44

6-3-2. TG2/TG7 Height Adjustment.................................. 5-45

6-3-3. FWD/RVS Position Adjustment.............................. 5-45

6-3-4. TG2/TG7 Electric Tension Regulator Adjustment.. 5-46

6-3-5. FWD/RVS Back Tension Adjustment ..................... 5-48

6-3-6. Adjustment Preparations and

RF Waveform Check .............................................. 5-49

6-3-7. Tracking Adjustment ............................................... 5-50

6-3-8. Tracking Check ....................................................... 5-51

6-3-9. CUE and REV Check............................................. 5-52

6-3-10. Rising Check .......................................................... 5-53

6-3-11. Tape Path Check .................................................... 5-54

5-2. SERVICE MODE ......................................................... 5-55

5-2-1. Adjusting Remote Commander.............................. 5-55

1. Used Adjustment Remote Commander................. 5-55

2. Precautions Upon Using The Adjusting Remote

Commander............................................................ 5-55

5-2-2. Data Processing..................................................... 5-56

5-2-3. Service Mode ......................................................... 5-57

1. Emergence Memory Address ................................ 5-57

1-1. EMG Code (Emergency Code) .............................. 5-57

5-3. VIDEO SECTION ADJUSTMENTS ............................ 5-58

3-1. Preparations Before Adjustment ................................. 5-58

3-1-1. Equipment Used..................................................... 5-58

3-1-2. Connection of Equipment....................................... 5-58

3-1-3. Adjusting Connectors (RP 228 Board CN775)...... 5-59

3-1-4. Checking the Input Signals .................................... 5-60

1. S Video Input .......................................................... 5-60

2. Video Input ............................................................. 5-60

3-1-5. Alignment Tapes ..................................................... 5-61

3-1-6. Input/Output Level and Impedance ....................... 5-62

3-2. Power Supply System Adjustment.............................. 5-62

1. Power Supply Voltage Check,

Power Block (U-2 Board)........................................ 5-62

2. Video/Audio Block Power Supply Voltage Check,

Power Block (U-2 Board)........................................ 5-62

3-3. System Control System Adjustment ........................... 5-63

1. Initializing the C, D, E Page Data........................... 5-63

2. Input of C Page Initial Data.................................... 5-63

3. Input of D Page Initial Data.................................... 5-63

4. Input of E Page Initial Data .................................... 5-63

5. Modification of C, D, E Page Data ......................... 5-63

6. Page C Address List .............................................. 5-64

7. Page D Address List .............................................. 5-64

8. Page E Address List............................................... 5-65

3-4. Servo System Adjustments ......................................... 5-66

1. Switching Position Adjustment (CM-56 Board) ..... 5-66

2. Capstan FG Duty Adjustment (CM-56 Board)....... 5-66

3-5. Video System Adjustments ......................................... 5-67

3-5-1. RP-228 Board Adjustments ................................... 5-67

1. Recording Current Adjustment (RP-228 Board).... 5-67

2. PLL fo Adjustment (RP-228 Board) ....................... 5-67

3. CLK Delay Adjustment (RP-228 Board) ................ 5-68

4. AGC Center Level Adjustment (RP-228 Board) .... 5-68

5. AEQ Adjustment (RP-228 Board) .......................... 5-69

6. PLL Capture Range Adjustment

(RP-228 Board) ...................................................... 5-70

7. IC774 41.85 MHz VCO Check (RP-228 Board) .... 5-70

3-5-2. JC-19 Board Adjustments...................................... 5-71

1. A/D Converter Reference Voltage Adjustment 1

(JC-19 Board)......................................................... 5-71

2. A/D Converter Reference Voltage Adjustment 2

(JC-19 Board)......................................................... 5-71

3. Y Signal Clamp Reference Voltage Adjustment

(JC-19 Board)......................................................... 5-71

4. CR Signal Clamp Reference Voltage Adjustment

(JC-19 Board)......................................................... 5-71

5. CB Signal Clamp Reference Voltage Adjustment

(JC-19 Board)......................................................... 5-71

6. Playback Y Signal Level Adjustment

(JC-19 Board)......................................................... 5-72

7. Playback CR Signal Level Adjustment

(JC-19 Board)......................................................... 5-72

8. Playback CB Signal Level Adjustment

(JC-19 Board)......................................................... 5-73

9. IC422 27MHz XTAL fo Adjustment (JC-19 Board) 5-73

10. AFC Preliminary Adjustment (JC-19 Board) ......... 5-73

11. AFC Picture Frame Adjustment (JC-19 Board) ..... 5-74

12. AFC Adjustment (JC-19 Board) ............................. 5-74

3-5-3. VA-102 Board Adjustments.................................... 5-75

1. AGC Adjustment (VA-102 Board) .......................... 5-75

2. Analog E-E VIDEO Signal Output Level

Adjustment (VA-102 Board) ................................... 5-75

3. Analog E-E Y Signal Output Level Check

(VA-102 Board)....................................................... 5-76

4. Analog E-E Chroma Signal Output Level Check

(VA-102 Board)....................................................... 5-76

5. Decoder VXO Freerunning Frequency Adjustment

(VA-102 Board)....................................................... 5-77

6. Video Input Y/C Separation Adjustment

(VA-102 Board)....................................................... 5-77

7. Decoder HUE Adjustment (VA-102 Board)............ 5-78

8. REC Y Level Adjustment (VA-102 Board).............. 5-79

9. REC CR Level Adjustment (VA-102 Board)........... 5-79

10. REC CB Level Adjustment (VA-102 Board) ........... 5-80

11. Encoder Freerunning Frequency Adjustment

(VA-102 Board)....................................................... 5-80

– 7 –

Section Title Page

12. Playback Y Level Check (VA-102 Board).............. 5-80

13. Playback Chroma Level Adjustment

(VA-102 Board)....................................................... 5-81

14. Playback Burst Level Adjustment (VA-102 Board)

(PAL Model Only) ................................................... 5-81

3-5-4. General Adjustment ................................................ 5-82

1. Y Output Level Adjustment (JC-19 Board) ............ 5-82

2. Encoder R-Y Input Level Adjustment

(JC-19 Board)......................................................... 5-82

3. Encoder B-Y Input Level Adjustment

(JC-19 Board)......................................................... 5-83

4. Decoder HUE Input Adjustment (JC-19 Board) .... 5-83

5. Battery Down Adjustment and Confirmation ......... 5-84

3-5-5. BIST Check ............................................................ 5-85

1. Playback System Check

(JC-19, RP-228 Boards) ........................................ 5-85

2. Record System Check ........................................... 5-86

3-6. Audio System Adjustments ......................................... 5-87

1. Playback Level/Indicator Check ............................. 5-87

2. E-E Level Check..................................................... 5-87

3. Recording/Playback Check (Audio Lock Mode) .... 5-87

3-7. Arrangement Diagram for Adjustment Parts............... 5-88

6. REPAIR PARTS LIST

6-1. Exploded Views ........................................................... 6-1

6-1-1. Overall Assembly ................................................... 6-1

6-1-2. Chassis Assembly .................................................. 6-2

6-1-3. MD Block Assembly ............................................... 6-3

6-1-4. FL Cassette Compartment Assembly.................... 6-4

6-1-5. Mechanism Chassis Assembly (1)

(Top Side View (1))................................................. 6-5

6-1-6. Mechanism Chassis Assembly (2)

(Top Side View (2))................................................. 6-6

6-1-7. Mechanism Chassis Assembly (3)

(Top Side View (3))................................................. 6-7

6-1-8. Mechanism Chassis Assembly (4)

(Bottom Side View (1)) ........................................... 6-8

6-1-9. Mechanism Chassis Assembly (5)

(Bottom Side View (2)) ........................................... 6-9

6-2. Electrical Parts List ..................................................... 6-10

Hardware List ........................................................................ 6-42

1-1

SECTION 1

GENERAL

This section is extracted from DSR­20MD/20MDP instruction manual.

DSR-20MD/20MDP

1-2

1-3

1-4

1-5

1-6

1-7

1-8

1-9

1-10

1-10 E

2-1

Note: Follow the disassembly procedure in the numerical order given.

2-1. REMOVAL OF UPPER CASE 2-3. REMOVAL OF VA-102 BOARD

2-2. REMOVAL OF FRONT PANEL

ASSEMBLY

2-4. REMOVAL OF POWER BLOCK

SECTION 2

DISASSEMBLY

DSR-20MD/20MDP

3 Open sides of upper case and

remove the one in the direction
of the arrow A.

2 Two case screws

(M3)

1 Two case screws

(M3)

A

3 Two claws

2 Two claws

1 Two sumitite screws

(B3)

4 Front panel

assembly

VA-102 board

1 Three flat cables

(CN051, 702, 851)

4 Harness

(CN601)

3 Two flat cables

(CN401, 703)

6 Two sumitite

screws (B3)

5 Two harnesses

(CN701, 852)

7 Two sumitite

screws (B3)

2 Two flat cables

(CN101, 102)

8 Remove the

VA102 board
in the direction
of the arrow.

4 Two sumitite

screws (B3)

8 Screw

(BVTT3 × 6)

6 Harness (CN2)

7 Harness

(CN13)

2 Harness

(CN2)

9 HG-1 board

3 Two harnesses

(CN10, 11)

5 Power block

1 Harness (CN1)

2-2

2-5. REMOVAL OF MD BLOCK ASSEMBLY 2-7. REMOVAL OF JC-19 BOARD

2-6. REMOVAL OF CM-56 BOARD

2-8. REMOVAL OF RP-228 BOARD

CM-56 board

6 Two claws

5 Screw

(P3 × 6)

4 Two flat cables

(CN001, 006)

7 CM-56 board

1 Three flat cables

(CN005, 007, 008)

3 Flat cable

(CN003)

2 Harness

(CN002)

JC-19 board

2 Two flat cable

(CN411, 412)

1 Harness

(CN501)

5 Four screws

(P2.6 × 5)

6 Two shield

cases

3 Claw

4 Claw

7 JC-19 board

RP-228 board

5 RP-228 board

4 Two tapping screws

(2 × 4.5)

1 Flat cable

(CN003)

2 Special tapping

screw

3 JC support

2 Two sumitite

screws (B3)

8 Harness

(CN004)

4 Two sumitite

screws (B3)

6 MD block

assembly

7 Three harnesses

(CN101, 701, 831)

5 Two sumitite

screws (B3)

1 Two flat cables

(CN103, 104)

3 Cassette

compartment
support

2-3

2-9. CIRCUIT BOARDS LOCATION

2-3 E

VA-102
IF, VIDEO IN/OUT, UVIC,
DV IN/OUT, MONITOR OUT,
AUDIO, HI MICOM, RS MICOM

RE-32
(V/A IN/OUT)

U-1 (POWER 1)

CM-56
(SERVO, SYSTEM CONTROL)

FR-136

(DISPLAY CONTROL)

MD-64
(TAPE DETECT)

MD-63
(TAPE DETECT)

MD-65
(TAPE DETECT)

RP-228
(REC/PB AMP)

U-2
(POWER 2)

RS-78
(RS-232C IF)

JC-19
AD/DA CONVERTER, S1 AFC, U1,
D1, C1 SPCON, MODE, DV IN/OUT,
AUDIO CORE, DIGITAL AUDIO,
AUDIO D/A, A/D CONVERTER

HP-100
HEADPHONE
& REC VR

HG-1
OVER DISCHARGE
PROTECT

DSR-20MD/20MDP

3-1 3-2

SECTION 3

BLOCK DIAGRAMS

3-1. OVERALL BLOCK DIAGRAM 1

3

7

3125

39

11 4 1 18

1 2

719

5

4

3

1

2

3 25 3

24

9 13

8 12

5

9 8

2

1110

23

22

11

7

1

3

7 7

14

11

1

2

3

7

5 25

1

20
28
19
24
10

25

12

24

26 30 31

77

3

20

4

40 1 47

1312

59

3

22

8

9

10

11

1

2

12

IC207

DIGITAL COMB FILTER

IC202

BUFFER

IC401

Y SWITCH

IC206

OSC

1

4

IC213

1

12

IC210

IC204

S-C/C SWITCH

IC408
VIDEO

BUFFER

IC653

MONITOR OUT

SELECT

IC402

C SWITCH

IC651

ON SCREEN

DISPLAY

IC652

SYNC SEP

IC403

SYNC SEP

IC405

ON SCREEN

DISPLAY

IC404

CHROMA DECODER

IC407

NPS

IC866

INVERTER

IC851

BUFFER

IC865

COMPARATOR

IC103
LED

DRIVER

IC104

FL

DRIVER

IC852 (1/2)

IC105

REMOTE CONTROL
RECEIVER

IN

OUT

LANC

IC853
MULTI

PLEXER

IC861

LANCOUT

IC208

NTSC DECODER

IC205
Y AGC

IC203

S-Y/Y SWITCH

IC201

S-VIDEO/VIDEO SWITCH

S-VIDEO

INPUT

VIDEO

11

13

15

3

5

7

1

9

5

3

1

13

11

9

15

7

FL

202

FL

201

2

2

RE-32 BOARD (1/2)

(SEE PAGE 4-57)

VA-102 BOARD (SEE PAGE 4-63 to 88)

CN102

J101
(1/2)

CN401

Y

C

V

SDC
DET

SDC DET

Y

C

V

MONITOR

X652

500KHz

X401

500KHz

Y

V

C

S-VIDEO

OUTPUT

VIDEO

MONITOR

VIDEO

1

2

3

2, 3

23

24

25

FL204

DL201

FL203

FL205

61

69

46

30

27

47

48

18

62

33

32

65

52

51

17

16

25 4
29 10

3 4
4 10

26

1210

125

133

14
11

5

9

6

8

5

13 4 2

4 11

6 8

9
ı

11

1
2

12

91

ı
96
99

4

12

19

14

16

18

13

20

1
6
ı

11

27

19

12

17

15

13

18

11

30
25

ı

20

1
ı
6

1
ı
4
10
ı
13

15

ı
32
35
39

ı
44

DUP, REC, PAUSE,
FF, REW, PLAY

AUDIO MONITOR, INPUT SELECT, UP, DOWN
POWER, EJECT, TIMER, COUNTER SELECT SET,
MEMU

LED

FF, REW, STOP, PLAY, DUP,
COUNTER RESET, PAUSE, REC

FUNCTION KEY

FUNCTION KEY

12

14

11

10

ND101

FLUORESCENT INDICATOR TUBE

BZ101

(BUZZER)

1

2

1

2

IR

A-1

A-2

A-3

A-4

A-5

A-6

A-7

A-9

A-10

A-11

A-13

A-12

A-14

B-1

B-2

B-3

B-4

B-5

B-6

B-7

A-8

POW, KE0-5

DATA TO HI

FLD CS

LED CS

DATA FROM HI

HI SCK

LED RST

BUZZER

CONTROL

J853

CN851

J852

J851

CN104

FR-136 BOARD

(SEE PAGE 4-107)

X651

14.3MHz
: DSR-20MD

17.7MHz
: DSR-20MDP

X402

14.3MHz :
DSR-20MD

17.7MHz :
DSR-20MDP

X403

14.3MHz
: DSR-20MD

17.7MHz
: DSR-20MDP

X201

14.3MHz
: DSR-20MD

17.7MHz
: DSR-20MDP

DSR-20MDP

Q103

3V 5V

Q108

3V 5V

Q107

3V 5V

Q102

3V 5V

2

HI-CON

(SEE PAGE 3-3)

A

(SEE PAGE 3-3)

B

05

DSR-20MD/20MDP

3-3 3-4

3-2. OVERALL BLOCK DIAGRAM 2

IC052

RS-232C CONTROL

IC002

INTERFACE

REMOTE
RS-232C

IC053

X052

1.2288MHz

IC715

BUFFER

IC716

BUFFER

IC711

AUDIO SELECTOR

IC713 IC705

IC714 IC707

IC717 IC709

IC718

FILTER

IC001

HP AMP

PHONES

IC710

IC704

BUFFER

IC708

AUDIO PROCESS

IC051

OSC

Q613

SYNC SEP

11

3 1

8

11

6

3

9

12

5

2

5 7

1 2 141213

3 1 10

3 12

13

8

RS-78
BOARD

(SEE PAGE 4-87)

12 9 10

83

24 2322202188

34 32269

8 92223

57

58

24

38 40

35

36 372021 7

1

6 7

4

3 2

42

43

84 86 87 85

14 13 8 7

100

12

97981954

55

5379

68412

9

5

1

13

7

11

15

3

2

4

12

2

4

12

INPUT

CH-1

CH-2

OUTPUT

CH-1/3

CH-2/4

MONITOR

CH-1/3

CH-2/4

EXT

INT

J101 (2/2)

12

2

10

8

23

21

19

3

5

6

14

13

17

SAME
AS CH-1

CN101 CN703

Q710

MUTE

Q709

MUTE

L

R-CH

R-CH

R-CH

S101

L

MONITOR

L

EXT/INT

SYNC

RE-32
BOARD (2/2)

(SEE PAGE 4-57)

9 11

CN702

CN001

HP-L

L

REC VR

R

REC VR

HP-100 BOARD

(SEE PAGE 4-95)

L REC
LEVEL

R REC
LEVEL

RV002

RV003

R-CH

R-CH

CN102
Y

CR

CB

Y

CR

CB

NPSA

NPSB

SGH

JC-19 BOARD
CN104
(SEE PAGE 3-5)

8

6

4

2

C

JC-19 BOARD
CN701
(SEE PAGE 3-6)

D

JC-19 BOARD
CN831
(SEE PAGE 3-7)

E

JC-19 BOARD
CN103
(SEE PAGE 3-7)

F

IC706

BUFFER

1 2

IC702

AUDIO SELECTOR

IC101

IC104 IC105

IC102

AND GATE/INVERTER

IC103

IC602
U VIC

CONTROL

IC854

IC858

RESET

IC857

E PROM

CLOCK GEN.

IC106

AND

GATE

13 14

9

IC701

BUFFER

1 3

28

3

10

11

12

31

18

17

32

13

29

10
11

31

5

7

6

3

2

1

4
10
13

CN601

TPA

NTPA

TPB

NTPB

CN602

DV

IN/OUT

R-CH

R-CH
(SAME AS L-CH)

L-CH

R-CH

CN701

L-CH

J001

R-CH

X852

32.768kHz

7

15

14

16

17

18

19

20

21

23

24

25

26

6

11

12

2

28

29

10

CN101

SX/V

UVIC GATE

UVIC SWIN

UVIC BUSY

XCS UVIC

MO SI

MO SO

MO SCK

MO RST

XCS MO

HI SI

HI SO

HI SCK

PB/XEE

OSD SCK

OSD SO

XCS OSD2

JOG FIL ON

MO XPFAIL

XHI RST

CN001

CN051

DTR

DSR

RXD

TXD

X851

20MHz

7

8

X051
8MHz

X853

32.768kHz

2

3

1

X601

3.58MHz
: DSR-20MD

4.43MHz
: DSR-20MDP

Q101

3V 5V

2

IC852 (2/2)

HI-CON

A-1

A-2

A-3

A-4

A-5

A-6

A-7

A-9

A-10

A-11

A-13

A-12

A-14

A-8

B-1

B-2

B-3

B-4

B-5

B-6

B-7

(SEE PAGE 3-2)

B

(SEE PAGE 3-2)

A

VA-102 BOARD (SEE PAGE 4-63 to 88)

05

DSR-20MD/20MDP

3-3. OVERALL BLOCK DIAGRAM 3

3-5 3-6

C

24

10

12

8

23

21

19

10

ı
13
15
17
19

16
18
20

1
ı
8

21

1
ı
8

21

1
ı
7

64

ı

71

111

ı

118

122

ı

129

17

ı

26

5
ı

13

68

ı

84

172

ı

189

91

ı

95

81

ı

85

62

ı

64

158

ı

160

34

ı

54

55

ı

57

82

ı

100

78

ı

80

2
ı

20

22

ı

27

36

ı

51

53

ı

57

22

ı

24

48

ı

50

81
83

ı

85

158

ı

165

149

ı

157

142

ı

148

134

ı

141

2
ı
9

12

ı

24

52

ı

64

67

ı

74

124

ı

131

116

ı

120

109

ı

113

97

ı

106

2
ı
9

16

ı

19

57

ı

60

67

ı

74

55

ı

62

46

ı

53

21

107

ı
110
120
130
131
166

9
10
28
98
99

139

145

146

76

78

79

77

28

43

53

2252

193

198

60 11

14

58

54

55

242559

23

612835

12 16 60

92–94

70–72

IC017

IC016

IC015

IC015 ~

A/D CONVERTER

IC017

IC209 IC214

~

TIMING GEN.

IC205

CLOCK GEN.

IC200

I/O

INTERFACE

IC401

BLANKING

IC403

V RAM

C

IC402

V RAM

Y

IC411

AV MIX

ECC
TBC

DESHUFFLE

IC009

IC018

REF DC GEN.

IC013

~

IC410

4M

D RAM

IC805

A/D, D/A

CON V.

IC911
AUDIO

CLK GEN.

IC902

D-FFS

IC904 (1/2)

FS CON

IC701

DV SIGNAL

PROCESS

IC702

DV INTERFACE

103
104
106

88
89
92

VA-102 BOARD

CN102

(SEE PAGE 3-3)

CN104

Y-IN

CR-IN

CB-IN

Y-OUT

CB-OUT

CR-OUT

AFCY

ADDRESS

ADDRESS

DATA

DATA

ADDRESS

ADDRESS

DATA

DATA

8bit DATA 8bit DATA

8bit DATA

FLBKY, FLBKC
CINV, REC, JSYC, JSYY
JFDE, JODE

8bit DATA

8bit DATA

TDI
TCK
TMS

SGH, SCCK

CK135, SCOE

CONTROL

16bit DATA

CN503

FOR CHECK

VRT, VRB

SP SI, SO, SCK

JC-19 BOARD

(SEE PAGE 4-19 to 54)

RP-228 BOARD

(SEE PAGE 4-11 to 14)

MECHA SI, SO, SCK

SP SI, SO, SCK

INPV, IOCE, IENPA

X701

24.576MHz

X702
6MHz

2 3 5 6

4 – 6 8 7 3 25 – 40 22 – 24

MO SI, SO, SCK

X PARSLEY MODE, X RESET, P FAIL, X LANC PWR ON, LANC P CONT, LANC OUT, LANC IN

SGH, SCCK, CK135, SCOE

18

ı

22

6
ı

10

9
ı

13

21

ı

25

20

ı

22

14

ı

16

9
ı

11

15

ı

17

12

ı

14

4

ı

6

20

5
6

2
3

4

2

8

6

25

27

37

X501

20MHz

12

23

21 20

2

47

19

31

27

42

28

40 36 13 26276 7 6 7 6 7

2 1

2 3

14

6

5

3

4

30 3

9

IC901
(1/2)

2 3 11

5

59 66

78

14

19

4

50

ı

54

59

ı

63

29

ı

35

2
ı
8

6
7

2
3

11
12
15
16
17

1

2
43
46

16
22
29
32

ı
35
45
46
55
65
67
80
81

59–67

7–12

33–36

19–2110–12

D

E

IC774

CHANNEL

CODING

IC770

E PROM

IC772

A/D

CONV

IC773

PLL

IC771

EVR

IC775

RF EQ

IC777

REC/PB

AMP

IC837

A/D, D/A CON V.

IC801

TIMING CONT

IC807 IC836

BUFF

IC838

BUFF

IC840

BUFF

BUFF

BUFF

IC831

7 6

IC831

BUFF

7 6

IC833

2 3

IC833

IC835

BUFF

IC804

IC703

DV

CONTROL

IC502

E PROM

IC501

MODE

CONTROL

IC504

D/A CONV

CN412

CN101

CN411

CN102

CN771

CN103

X/Y ODD

X/Y EVEN

DRUM HEAD

PB RF

MECHA SI, SO, SCK

SP SI, SO, SCK

VA-102 BOARD

CN601

(SEE PAGE 3-4)

Y CLP ERR, CR CLP ERR, CB CLP ERR

SP SI, SO, SCK

X801

49.152MHz
VA-102 BOARD

CN701

(SEE PAGE 3-4)

H

G

CM-56 BOARD

CN003

(SEE PAGE 3-7)

CN831

A. PB. L

A. PB. R

A. REC. L

A. REC. R

H-1

H-2

H-3

H-4

H-5

H-6

H-7

H-8

H-9
H-10

H-11

H-12

LRCK, BCK, MCK, FSE1, FSE2

MCK

INDT 0–15

DATA BUS

ADDRESS BUS

CNA, LPS, PWR DN, XRESET

TPA, TPB
NTPA, NTPB

CN701

CN702

FOR CHECK

MO SI, SO, SCK

15

25

24

1 2 26 30 38 61 85

X HI RST,
MO XPFAIL

2 1

7 6

1 2

2 1

IC901 (2/2)

IC421 (2/2)

SP CON

IC422 (2/2)

IC903

AUDIO CLOCK

IC907 IC909

IC916

29

28

REQ, CLK, D0/1
CTL0/1

11

12

88

X502

32.768kHz

46

80
82
83

101

IC834

IC834

13 14

3 4

EMPHASIS

EMPHASIS

10
27
63
ı
65
93

IC904 (2/2)

FS CON

11

ı
15
41

53

FLTA

FLTT

2

BUFF

2

15

XYCSEP

44

7

1

2

IC206

4

AND

11

ı

15

16

ı

20

2
ı

4
16
26

ı
29

74

ı
77
80

MECHA
SO/SI/SCK

SP
SCK/SO/SI

1
ı
4

64

5
6
27
72
73

ISCDXI 0-4

AVDXI 0-4

DXO 0-4

SEE PAGE

3-7

( )

05

DSR-20MD/20MDP

3-7 3-8

3-4. OVERALL BLOCK DIAGRAM 4

CM-56 BOARD

(SEE PAGE 4-101 to 104)

25

ı

27

17

ı

19

11

OSDSO S X/V, HI SCK, HI SO, HI SI, XCS MO, MORST, PB/XEE
OSD SCK, XCS UVIC, UVIC BUSY, UVIC SWIN, UVIC GATE, XCS OSD2

X422
27MHz

IC005

ATF

IC021
DRUM
MOTOR
DRIVE

IC019

BUFFER

IC503

CAP

MOTOR

DRIVE

IC022

REEL

MOTOR

DRIVE

IC003

MECHA CONTROL

IC421 (1/2)

SP CON

IC422 (1/2)

FRAME PLL

IC017

IC002

IC009

LOADING

MOTOR

DRIVE

IC018

COMP

IC006

COMP

5 32 74

43

58

44

45

49

29

72

15

4

15

4

3119

18

21

78

52

51

79

28

71

26

20196

11

4

15

13

123

5

121

2

13 10

5

7

7

5

10

96

59

6

28

21

ı

23

21

ı

23

33

ı

35

33

ı

35

60

ı

62

60

ı

62

22

ı

25

77
ı
79

57
56

1
29
31

6
8

95
96

15
24

7–9

CN003

8

ı

10

12
13

2

ı

5

6
7

3
4

5
6

13

12
13

2

4

1

7

9

3

1

16

8

4

13

14

15

3
10
11

5
ı
7

2
3

6

ı

11

1
2

CN008

CN007

CN006

CN005

CN001

CN008

8

6

9

3

1

14

16

1

9

13

4

3

2

10

ı

13

8
9

1
ı
4

1
2

S

L

S

L

50

2

3
32
33

TRKD, FLTD

SGH, SCCK
CK135, SCOE

X421

20MHz

MO RST

MO SI, SO, SCK

CN103

2 3 11 – 13 5 – 8 10 14 – 17 19 – 21 24 25 29

F

VA-102 BOARD

CN101

(SEE PAGE 3-4)

3 2 12

5 7 13

3 1 4107

6115129101

6

13
14

IC103 IC105

IC102

IC101

IC003

IC005 IC006

IC004

M

M

M

M

DRUM U/V/W

MD-65 BOARD(1/2)

(SEE PAGE 4-91)

MD-65 BOARD(2/2)

(SEE PAGE 4-91)

FP-406 BOARD

(SEE PAGE 4-91)

MD-63 BOARD

(SEE PAGE 4-91)

MD-64 BOARD

(SEE PAGE 4-91)

CN202 CN201

DRUM
PG FG

M901

DRUM

MOTOR

M902
CAPSTAN
MOTOR

M904

REEL

MOTOR

CAP

FG

REEL

FG

CN002

CN101

CN202 CN203

CN204

S002

(CC DOWN)

T ELETEN

S T REEL

FG

L T REEL

FG

S S REEL

FG

L S REEL

FG

S ELETEN

Q101
TAPE END
SENSOR

Q102

TAPE END

SENSOR

TAPE

LED

REC

PROOF

C IN

S101

(C OUT)

M903

LOADING

MOTOR

MODE

SW

IC016

LPF

IC011

IC012
DC/DC
CONV.

1 3

IC014

FG

AMP

IC008

5V~3V
LEVEL
CONV.

FG, PG

AMP

PBRF

MECHA SCK,DATA FROM MECHA,DATA TO MECHA

SP SI,SP SO,SP SCK

18

2

3

5

CN501

C IN
CHIME SDA
CHIME SCK

5 2 3

CN002

11

10

6

7

AND

1
5

2

12

3

CN901

(FOR CASSETTE MEMORY)

LM LOARD

/UNLOAD

MODE SW

A-D

C OUT

C IN

CHIME SCK

CHIME SDA

REC PROOF

T EL OUT

TAPE LED

END SENS

L S REEL FG

S S REEL FG

TOP SENS

L T REEL FG

S T REEL FG

S EL OUT

CC DOWN SW

FG OUT

REEL

U/V/W

CAP

U/V/W

FG OUT

FG,PG

U,V,W

PG,FG

C IN

CHIME SDA

CHIME SCK

40

41

X001

20MHz

H-1

H-2

H-3

H-4

H-5

H-6

H-7

H-8

H-9

H-10

H-11

H-12

05

H

( )

SEE PAGE

3-6

G

RP-228 BOARD

CN103

(SEE PAGE 3-6)

JC-19 BOARD

(SEE PAGE 4-19 to 54)

DSR-20MD/20MDP

3-9 3-10

3-5. OVERALL BLOCK DIAGRAM 5

1
2

3
4

4

2

7

8

1

2

1

3

4

6

7

9

M

1

CN2

M905

FAN

MOTOR

CN13

SW+12V

AC BLOCK +12V

DC +12V

AC BLOCK +12V

DC +12V

DC OUT

DC IN

CN12

3

CN11

UNSW 6V

UNSW 3.1V

VIDEO 5V

J 3.1V

VIDEO –5V

AUDIO +5V

AUDIO –5V

56134

CN010

UNSW 14V

UNSW 6V

SW 3.1V

SW 5V

SW 6V

UNSW 6V

UNSW 3.1V

UNSW –9V

DC 12V

UNSW 14V

POWER

CONT

CN1

1 2

1
2

3
4

1
2

3
4

7
8

9

10

DC IN 12V

2.5A

1 8

7 8

IC2

IC1

IC1

RELAY DRIVE

IC2

HG-1 BOARD

(SEE PAGE 4-110)

CN2

J901

RY1

CN1

Q1

12V REG

Q2, Q4

SWITCH

1
2

U-1 BOARD

(SEE PAGE 4-113)

U-2 BOARD

(SEE PAGE 4-117)

CN3

2

1

F2

F1

CN1

F1, F2

3.15A/125V :DSR-20MD
T1.6AL/250V :DSR-20MDP

Q1

SWITCH

PHOTO

COUPLER

AC IN

Z1

PWM

Z2

Z3

L1
L2

D1

AC IN

AC INLET

T1

POWER TRANS

Z1

D-D CONV.

5 4

Z3

+6V REG

1 2

Z7

+3.1V REG

152

Z8

D-D CONV.

1 2

Z2

+14V REG

1 2

Z5

+5V REG

1 2

Z11

+6V REG

142

Z4

+3.1V REG

3 1

Z10

-5V REG

2 3

F2

T5A/250V

L1, L2
NOISE

FILTER

13

15

14

16

1
ı
4

Z4

POWER

CONTROL

I

VA-102 BOARD

CN852

(SEE PAGE 3-11)

J

JC-19 BOARD

CN101

(SEE PAGE 3-11)

K

CM-56 BOARD

CN004

(SEE PAGE 3-12)

05

DSR-20MD/20MDP

3-11 3-12 E

3-6. OVERALL BLOCK DIAGRAM 6

2

1

3

4

6

7

9

VA-102 BOARD

(SEE PAGE 4-63 to 88)

4

3

2

7

8

1

CN852

CN101

UNSW 6V

UNSW 3.1V

VIDEO 5V

AUDIO +5V

J 3.1V

VIDEO –5V

AUDIO –5V

05

UNSW 14V

UNSW 6V

SW 3.1V

SW 5V

SW 6V

UNSW 3.1V

DC 12V

UNSW 6V

UNSW –9V

UNSW 14V

POWER
CONT

IC209

TIMING

GEN.

4

IC012

RF DC

GEN.

11

IC906
AUDIO
CLOCK

IC009

RF DC

GEN.

RF DC
GEN.

IC011

4 14

IC214

TIMING

GEN.

TIMING

GEN.

14

IC210

IC018

5

IC019

BUFFER

3 1

IC013 IC014

RF DC
GEN.FGAMP

8

4

IC511

5V REG

IC503

IC410

4M DRAM

3

5

IC208

NTSC DEC.

15

IC10316IC104

IC105

LED

DRIVERFLDRIVER

REMOTE
CONTROL
RECEIVER

4

1

IC510
3V REG

2 3

IC501
MODE

CONTROL

IC207

3V REG

1 3

IC213

TIMING

GEN.

TIMING

GEN.

16

IC212

8

IC402

V RAM

IC403

IC703

DV CONTROL

IC401

BLANKING

IC421

SP CON

IC211

IC422

FRAME PLL

IC205

TIMING GEN. CLOCK GEN.

IC411

AV MIX

IC702

DV

INTERFACE

IC701

DV SIGNAL PROCESS

IC200

I/O INTERFACE

IC502

INV E PROM

8

IC504

D/A

CONV

IC915

8

14

IC909

AUDIO

CLOCK

AUDIO
CLOCK

IC903
AUDIO
CLOCK

5

IC911

AUDIO CLK GEN.

IC802

REG

CONT

3

IC907

IC916

IC841COMP

3

IC206

OSC

6

IC901

IC904
FS CON

IC914

5

IC804

IC801

COMPCOMPAND

TIMING

CONT

IC908

AND

IC805

AD/DA
CONV

IC807

AND

8

IC835

8

IC837
AD/DA
CONV.

21

IC838

BUFFER

BUFFER

BUFFER

14

8

IC836

IC840

8

4

IC902

D-FFS

D-FFS

~

IC015

IC017

~

A/D CONVERTER

11
16

IC861

1

8

IC865

14

IC863

5V REG

1

3

2

IC85114IC857

8

13

IC866

COMP INV.

5

IC853
MULTI
PLEXER

16

IC856

DC/DC

CONV

2

4

3

IC701

BUFFER

IC709

4

8

IC708
AUDIO

PROCESS

8

IC702
IC703
IC711

AUDIO

SELECTOR

7

16

IC001

HP AMP

8

4

IC652
SYNC

SEP

13

IC653

MONITOR

OUT

SELECT

6

IC213

5

IC651

IC8585IC854

8

LANC
OUT

BUFFER CLOCK

GEN.

RESET E PROM

10 11 13 – 16 19 20 29

2 3 10 11 16 5 26 30 32 33 58

3 8 17 18 26 33 39

7 8

3 11 16

4 10 14

42 76 77 86 87

3 36 54 81 95 119 138 144 147 153 157

1 15 27 28 48 49 61 62 75 76 99

3

16

33 73

13 23

2 5 9 12 14

5 10 31 76 89 91

6 16 26 46 56 64 69 70 74 86 96

IC207

DIGITAL COMB FILTER

13 17 18 26 28 29 37 53 56 67 73

15 30 36 44 96 103 132 154

35 66 88 118

14

IC101

AND

/BUFF

IC103

IC405

OSD

OSD

IC602
U VIC

CONTROL

3

IC205

Y AGC

6

16

IC002

INTER FACE

1

IC864

REG

CONT

8

IC053

OSC

8

IC102

INV

AND

6

IC401

IC402

13

IC403

SYNC SEP

Y/C

SWITCH

14

IC104

IC105

IC106

2 3

IC862

-5V REG

IC052

RS-232C
CONTROL

5 10 31 76 88

IC407

NPS

5 6 13 22 29

IC404

CHROMA DEC.

3 8 9 12 17 21 25

IC051

OSC

1 4 10 13 14

30

2

29

23
24

8

6

1

10

D864

D856

IC704 IC707

~

IC710

IC712 IC718

~

D+5V/AV VDD

VIDEO/AUDIO-5V

VIDEO/AUDIO+5V

IC201
IC203
IC204

INPUT

SELECT

4
7
21

9
16
22
23

IC210

2

3
10
11
16

4
21

SW+5V

FL+VDD

FL–VDD

DIG+5V

CN001

CN051

+VCC

CN104

CN851

ND101

FLUORESCENT INDICATOR TUBE

FR-136 BOARD

(SEE PAGE 4-107)

RS-78 BOARD

(SEE PAGE 4-87)

JC-19 BOARD

(SEE PAGE 4-19 to 54)

HP-100 BOARD

(SEE PAGE 4-95)

13 33 45

CN001

CN702

AVDD

A–4V

A+4V

D855

30

CN101

B UP+5V

1

CN103

1
7

IC831 IC833

~

B UP 5V

CHIME

VDD

CN501

UNSW 3.1V

71

1

7

6

5

4

5

3

1

4

5

6

8

9
10

6
7

15

IC003

MECHA

CONT

IC008

5V~3V
LEVEL
CONV

IC006

IC018

COMP

IC014

FG AMP

IC011

IC005

ATF

IC016

LPF

IC002

SW

IC017

SW

IC009

IC503

CAP MOTOR

DRIVE

REEL MOTOR

DRIVE

IC501

5V REG

IC021

DRUM

MOTOR

DRIVE

IC022

DC/DC
CONV

IC012

CM-56 BOARD

(SEE PAGE 4-101 to 104)

FP-406 BOARD

(SEE PAGE 4-91)

MD-63 BOARD

(SEE PAGE 4-91)

MD-64 BOARD

(SEE PAGE 4-91)

IC103

IC105

IC005

T REEL

SENSOR

S REEL

SENSOR

IC006

IC101

IC102

IC003

IC004

6

12

2

11

5

15

2

14

M902

CAPSTAN MOTOR

M904

REEL MOTOR

CN101

CN901

CN002

CN002

CN004

36

CN003

PBRF PFV

CN001

CHIME VDD

EL 5V

REEL LED

EL 5V

REEL RED

CN005

CN007

FG VCC

CN006

FG VCC

(FOR CASSETTE

MEMORY)

DSR-20MDP

2

FG, PG

AMP

LOADING

MOTOR

DRIVE

T REEL

FG

S REEL

FG

RP-228 BOARD

(SEE PAGE 4-11 to 14)

23

21
22

24
25

16

CN103

3.1V

5V

RF 5V

PB RF PSV

IC774

CHANNEL

CODING

IC770

E PROM

IC771

IC772

A/D CONV

IC775

RF EQ

IC777

REC/PB

AMP

IC773

PLL

Q774, 775

Q772, 773

2

IC852

HI-CON

44 53 79 88 89

77 78

1

11

Q852

P CONT

K

U-2 BOARD

CN10

(SEE PAGE 3-10)

J

U-2 BOARD

CN11

(SEE PAGE 3-10)

I

U-2 BOARD

CN12

(SEE PAGE 3-10)

4-1

SECTION 4

PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS

For printed wiring boards:

• b : Pattern from the side which enables seeing.
(The other layers’ pattern are not indicated)

• Circled numbers refer to waveforms.

• Through hole is omitted.

• There are few cases that the part printed on diagram isn’t
mounted in this model.

• Chip parts.

For schematic Diagram:

• All capacitors are in µF unless otherwise noted. pF : µµF
50V or less are not indicated except for electrolytics and
tantalums.

• Chip resistors are 1/

10

W unless otherwise noted.

kΩ : 1000Ω, MΩ : 1000kΩ.

• Caution when replacing chip parts.
New parts must be attached after removal of chip.
Be careful not to heat the minus side of tantalum capacitor,
because it is damaged by the heat.

• Some chip part will be indicated as follows.

• Constants of resistors, capasitors, ICs and etc with XX indi­cate that they are not used. In such cases, the unused cir­cuits may be indicated.

• Parts with ★ differ according to the model/destination. Re­fer to the mount table for each function.

• All variable and adjustable resistors have characteristic curve
B, unless otherwise noted.

• Signal name

XEDIT → EDIT PB/XREC → PB/REC

• 2 : nonflammable resistor.

• 1 : fusible resistor.

• C : panel designation.

• A : B+ Line.*

• B : B– Line.*

• J : IN/OUT direction of B line (+, –).*

• C : adjustment for repair.*

• Circled numbers refer to waveforms.*

21321321

3

34521123

654

EB

C

31

5

5246

123

54

Transistor Diode

Example C 541

22U

TA A

L 452
10UH

2520

Kinds of Temperature External
capacitor characteristics dimensions (mm)

THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each block)

Measuring conditions voltege and waveform:

• Voltages and waveforms are measured between the mea­surement points and graound when color bar signal
input.They are reference values and reference wav eforms.*
(VOM of DC 10 M Ω input impedance is used)

• Voltage values change depending upon input impedance
of VOM used.

* Indicated by the color red.

DSR-20MD/20MDP

When indicating parts by reference
number, please include the board
name.

Note:

The components identi­fied by mark 0 or dotted
line with mark 0 are criti­cal for safety .
Replace only with part
number specified.

Note:

Les composants identifiés par
une marque 0 sont critiques
pour la sécurité.
Ne les remplacer que par une
piéce portant le numéro
spécifié.

DSR-20MD/20MDP

4-3 4-4

4-1. FRAME SCHEMATIC DIAGRAMS

FRAME (1/2) SCHEMATIC DIAGRAM

FRAME (1/2)

1

2

3

4

5

6

7

8

123456789

1234567

8

123456789

1011121314

15

6P

CN701

12345

6

123456789

10111213141516

12345

6

1

2

3

4

5

123456789

10111213141516

123456789

1011121314

15

123456789

1011121314

15

1

2

3

4

5

6

7

8

9

10

11

1

2

3

4

5

6

7

8

9

10

11

12

13

14

123456789

1

2

1

2

3

4

5

6

7

8

9

10

11

12

13

14

1

2

3

4

5

6

7

8

123456789

1011121314

15

8P

CN501

1234567

8

1

2

3

4

5

6

7

8

9

9P

CN101

1

2

3

4

5

6

7

8

9

30P

CN103

1B.UP_5V

2XHI_RST

3MO_XPFAIL

4MO_XWAKEUP

5HI_SCK

6HI_SO

7HI_SI

8XCS_MO

9GND

10MO_RST

11MO_SCK

12MO_SO

13MO_SI

14XCS_UVIC

15UVIC_BUSY

16UVIC_SWIN

17UVIC_GATE

18GND

19OSD_SO

20OSD_SCK

21XCS_SCK

22OSD2_ON

23GND

24S/XV

25PB/XEE

26A.MON.1

27A.MON.2

28A.XUP

29RSV_1

30RSV_2

30P

CN104

1LALT

2BLK

3BF

4N.C

5CLP2

6S1_COUT

7GND

8Y_OUT

9GND

10CR_OUT

11GND

12CB_OUT

13GND

14SGH

15XYCSEP

16N.C

17NPSA

18NPSB

19Y_IN

20GND

21CR_IN

22GND

23CB_IN

24AFCY

25CLPY

26N.C

27N.C

28AGC_ADJ

29HEU_ADJ

30VXO_ADJ

30P

CN412

1 TD07

2 TD08

3 CLKEN

4 CRCK

5 GND

6 DXO4

7 DXO3

8 DCO2

9 DXO1

10 DXO0

11 AVDXI4

12 AVDXI3

13 AVDXI2

14 AVDXI1

15 AVDXI0

16 ITISRC

17 CPCK

18 ISCDXI4

19 ISCDXI3

20 ISCDXI2

21 ISCDXI1

22 ISCDXI0

23 AVSRC

24 SCSRC

25 ITISYNP

26 AVSYNP

27 SCSYNP

28 BSCON

29 XADADJ

30 VITOFF

30P

CN411

1 SP_RST

2 GND

3 SCOD_WINDOW

4 GND

5 DREF

6 C1ERP

7 CLKDLY

8 PLLFRP

9 RECA1

10 RECA2

11 CS RF EEPROM

12 RST RF EEPROM

13 READY RF EEPROM

14 SP SI

15 SP SO

16 SP SCK

17 GND

18 XCS MECHA

19 MO RESET

20 MECHA SCK

21 MECHA SI

22 MECHA SO

23 MECHA-CS-D1

24 GND

25 TRKD

26 FLTD

27 JSWP

28 TBC-REN

29 DRAM-SANK

30 GND

30P

CN101

1VITOFF

2XADADJ

3BSCON

4SCSYNP

5AVSYNP

6ITISYNP

7SCSRC

8AVSRC

9ISCDXI0

10ISCDXI1

11ISCDXI2

12ISCDXI3

13ISCDXI4

14CPCK

15ITISRC

16AVDXI0

17AVDXI1

18AVDXI2

19AVDXI3

20AVDXI4

21DXO0

22DXO1

23DXO2

24DXO3

25DXO4

26GND

27CRCK

28CLKEN

29TDI

30TDO7

20P

CN775

1 TCK

2 TMS

3 TDI

4 GND

5 TRACK_ID

6 JSWP

7 GND

8 RF_MONITOR

9 VCC2

10 AGC_IN

11 VCC1

12 EQ_IN

13 LOCK

14 REF_OUT

15 ENV_OUT

16 GND

17 TDO

18 C1ERP

19 FLTD

20 GND

30P

CN103

1

DX_PLL_ERR

2

(RF_CH_PWR_SAVE)

3

SCOD WINDOW

4

DATA FROM MECHA

5

DATA TO MECHA

6

MECHA SCK

7

MECA STB DA

8

FLTD9TRKD

10

MO_RST

11

XCS_MECHA

12

SP SCK

13

SP SO14SP SI

15

GND

16

PBRF PSV

17

GND18GND

19

ATF GAIN

20

PBRF213.1V223.1V

235V245V25

AV_AREA

26

XME/MP

27

JSWP

28

TBCRE

29

BANK

30

XCS_MECHA_D1

30P

CN102

1GND

2BANK

3TBCRE

4JSWP

5FLTD

6TRKD

7GND

8XCS_MECHA_D1

9MECHA_SO

10MECHA_SI

11MECHA_SCK

12MO_RST

13XCS_MECHA

14GND

15SP_SCK

16SP_SO

17SP_SI

18EEPROM_XBUSY

19EEPROM_RST

20XCS_EEPROM

21RECA2

22RECA1

23PLLFRP

24CLKDLY

25C1ERP

26DREF

27GND

28SCOD_WINDOW

29PLL_SRC

30XVSP_RST

10P

CN771

1 GND

2

X_EVEN3Y_EVEN

4 GND

5 Y_ODD

6 X_ODD

7 GND

8NC9

NC

10 GND

CN003

30P

123456789

101112131415161718192021222324252627282930

8P

CN831

1AUDIO_GND

2A.DA.R

3AUDIO_GND

4A.DA.L

5AUDIO.AD_GND

6A.AD.R

7AUDIO.AD_GND

8A.AD.L

8P

CN701

1 AUDIO_GND

2 A.DA.R

3 AUDIO_GND

4 A.DA.L

5 AUDIO.AD_GND

6 A.AD.R

7 AUDIO.AD_GND

8 A.AD.L

30P

CN101

1 RSV_2

2 RSV_1

3 A.XUP

4 A.MON.2

5 A.MON.1

6 PB/XEE

7 S/XV

8 GND

9 OSD2_ON

10 XCS_OSD2

11 OSD_SCK

12 OSD_SO

13 GND

14 UVIC_GATE

15 UVIC_SWIN

16 UVIC_BUSY

17 XCS_UVIC

18 MO_SI

19 MO_SO

20 MO_SCK

21 MO_RST

22 GND

23 XCS_MO

24 HI_SI

25 HI_SO

26 HI_SCK

27 MO_XWAKEUP

28 MO_XPFAIL

29 XHI_RST

30 B.UP_5V

30P

CN102

1 VXO_ADJ

2 HEU_ADJ

3 AGC_HUE

4 N.C.

5 N.C.

6 CLPY

7 AFCY

8 CB_IN

9 GND

10 CR_IN

11 GND

12 Y_IN

13 NPSB

14 NPSA

15 N.C.

16 XYCSEP

17 SGH

18 GND

19 CB_OUT

20 GND

21 CR_OUT

22 GND

23 Y_OUT

24 GND

25 S1_COUT

26 CLP2

27 N.C.

28 BF

29 BLK

30 LALT

4P

CN602

1 NTPB

2 TPB

3 NTPA

4TPA

2P

CN13

1 SW+12V

2 GND

2P

CN1

1 AC IN

3 AC IN

6P

CN2

1 DC OUT

2

DC OUT

3 DC IN

4 DC IN

5

GND

6 GND

8PCN12

1POWER CONT

2UNSW_6V

3DC 12V

4UNSW_3.1V

5GND

6GND

7UNSW_-9V

8UNSW_14V

8P

CN852

1 POWER CONT

2 UNSW_6V

3 DC 12V

4 UNSW_3.1V

5 GND

6 GND

7 UNSW_-9V

8 UNSW_14V

1 AC IN

2 AC IN

3 AC IN

4 AC IN

1AC IN

2AC IN

3AC IN

4AC IN

6P

CN1

1

2

3

4

5

6

13 14 15 16 17 18 19 20 21

A

B

C

D

E

F

G

H

I

J

123456789101112

10P

CN2

1

AC BLOCK +12V

2

AC BLOCK +12V

3

DC +12V

4

DC +12V

5GND

6GND

7DC IN

8DC IN

9

DC OUT10DC OUT

UNSW6V

CN005

9P

TOP SENS

REEL LED

COM

W

UHE(+)

END SENS

COM

GND

VHE(+)

FG OUT(-)

CM-56 BOARD

CAP

GND

S EL OUT

VHE(+)

ELGND

C IN

DRUM V

HE GND

LM LOAD

CHIME VDD

GND

MODE SW D

CAP U

MODE SW A

WHE(+)

CAP V

FG

L SREEL FG

CHIME VDD

V

CN006

15P

FG OUT(+)

FG GND

FG OUT(+)

FG OUT(+)

CN008
14P

FG

ELGND

C OUT

SENSER VCC

MODE SW B

MOTOR GND

CAPSTAN

REEL U

CHIME SDA

PG

CHIME SCK

FG GND

CHIME GND

S TREEL FG

SW6V

CN204
5P

HE VCC

CHIME GND

TPA

VHE(+)

COM

JC-19 BOARD

FG VCC

REEL LED

RP-228 BOARD

HE VCC

S SREEL FG

MOTOR GND

MODE SW A

WHE(-)

W

CAP W

L TREEL FG

WHE(+)

UN SW 14V

LM UNLOAD

UN SW 3.1V

CN002 8P

EL5V

WHE(-)

REEL V

REEL W

FG VCC

UHE(-)

HE VCC

DRUM V

UNSW14V

CN101

16P

S SREEL FG

MODE SW C

DGND

HE GND

L TREEL FG

MODE SW D

C IN

C IN

CN001

16P

UHE(+)

LM LOAD

REC PROOF

CHIME SDA

GND

DRUM U

EL GND

HE GND

CN201
11PMODE SW C

END SENS

VHE(+)

T ELOUT

VB

CHIME SDA

LM UNLOAD

COM

UHE(-)

FG VCC

C OUT

SENSER VCC

CAP W

SW3.1V

S ELOUT

SW5V

REEL V

MODE SW A

CN007

15P

CAP V

PG

TPB

CN202
14P

PG

FG

TAPE LED

EL GND

FG VCC

GND

UHE(+)

SW6V

UN SW 6V

TAPE LED

MD-64
BOARD

WHE(+)

FG OUT(+)

UHE(-)

VHE(-)

MOTOR GND

DGND

HE GND

VHE(-)

DRUM W

N.C.

S TREEL FG

MODE SW B

WHE(-)

EL5V

WHE(+)

MD-63
BOARD

REEL U

FG OUT(-)

REEL LED

FG GND

CC DOWN

V

LM UNLOAD

FG OUT(-)

DRUM U

CHIME GND

REEL W

REC PROOF

MODE SW D

NTPA

MODE SW C

GND

CC DOWN SW

COM

VHE(-)

HE VCC

VHE(-)

REEL

TOP SENS

SW3.1V

CHIME SCK

COM

CHIME SCK

CAP U

UHE(+)

CN203
2P

T ELOUT

SW5V

MD-65

REEL LED

FG GND

COM

V

LM LOAD

DRUM W

EL5V

MOTOR GND

CHIME VDD

L SREEL FG

WHE(-)

EL 5V

MODE SW B

UHE(-)

GND

FG OUT(-)

NTPB

CN002

9P

SENSER VCC

UN SW 3.1V

N.C.

C IN

CHIME SCK

GND

CHIME GND

CHIME SDA

CHIME VDD

VA-102 BOARD (1/2)

PBRF

SP SI

MECHA-STB-DA

FLTD

PBRF PSV

TO RP

TRKD

SCOD WINDOW

TBC-REN

RP3.1V

GND

AV_AREA

DRAM-BNK

ATF GAIN

XMECHA_CS_D1

MECHA SI

SP CS MECHA

GND

JSWP

SP S0

RESET FROM MODE

5V

SP SCK

DX_PLL_ERR

5V

RP3.1V

GND

XME_MP

MECHA SO

NC

MECHA SCK

CN004
8P

CN10
8P

M902

MOTOR

REEL

M904

MOTOR

DRUM

HEAD

MOTOR

DRUM

BOARD

M901

LOAD

M903

MOTOR

MODE SW

S001

TPB

DGND

NTPB

DGND

TPA

NTPA

CN601

6P

CN11
9P

AUDIO_5V

UNSW_6V

GND

VIDEO_-5V

AUDIO_-5V

UNSW_3.1V

AUDIO_GND

J_3.1V

VIDEO_5VVIDEO_5V

GND

UNSW_6V

VIDEO_-5V

AUDIO_5V

AUDIO_GND

AUDIO_-5V

J_3.1V

UNSW_3.1V

DV

IN/OUT

AC INLET

BOARD

U-2

M905

FUN

MOTOR

U-1 BOARD

CN1 4p

J901

DC JACK

GND

AC BLOCK +12V

DC +12V

DC +12V

GND

AC BLOCK +12V

HG-1

BOARD

22

P

O

L

K

M

N

05

DSR-20MD/20MDP

4-5 4-6

FRAME (2/2) SCHEMATIC DIAGRAM

FRAME (2/2)

15P

CN703

1GND

2GND

3A.IN_L

4GND

5A.IN_R

6GND

7A.OUT_L

8GND

9A.OUT_R

10GND

11A.MON_L

12GND

13A.MON_R

14GND

15EXT/XINT SYNC

15P

CN102

1

MONITOR_OUT

2 GND

3 Y_OUT

4 GND

5 C_OUT

6 GND

7 V_OUT

8 GND

9

Y_IN

10 GND

11

C_IN

12 GND

13

V_IN

14 GND

15

SDC DET

15P

CN101

1

EXT/XINT SYNC

2 GND

3

A.MON_R

4 GND

5

A.MON_L

6 GND

7

A.OUT_R

8 GND

9

A.OUT_L

10 GND

11

A.IN_R

12 GND

13

A.IN_L

14 GND

15 GND

15P

CN401

1SDC DET

2GND

3V_IN

4GND

5C_IN

6GND

7Y_IN

8GND

9V_OUT

10GND

11C_OUT

12GND

13Y_OUT

14GND

15MONITOR_OUT

30PCN851

1 POWER SW

2 SW_5V

3 GND

4 IR IN

5 GND

6 KEY0

7 KEY1

8 KEY2

9 KEY3

10 KEY4

11 KEY5

12 DATA TO HI

13 LED RST

14 LED CS

15 GND

16 DATA FROM HI

17 GND

18 HI SCK

19 FLD CS

20 BUZZER

21 GND

22 GND

23 DIG_5V

24 DIG_5V

25 GND

26 RESET

27 GND

28 FL-VEE

29 FL-VDD

30 FL+VDD

30P

CN104

1

FL+VDD

2

FL-VDD

3

FL-VEE

4GND

5

RESET

6

GND

7

DIG_5V

8

DIG_5V

9GND

10GND

11

BUZZER

12

FLD CS

13

HI SCK

14GND

15

DATA FROM HI

16GND

17

LED CS

18

LED RST

19

DATA TO HI

20

KEY5

21

KEY4

22

KEY3

23

KEY2

24

KEY1

25

KEY0

26GND

27

IR IN

28GND

29

SW_5V

30

POWER SW

12P

CN702

1 AD VDD

2 LCH REC VR

3 GND

4 RCH REC VR

5 GND

6 A.+4V

7 GND

8 A.-4V

9 GND

10 HP RCH OUT

11 GND

12 HP LCH OUT

12P

CN001

1AD VDD

2LCH REC VR

3GND

4RCH REC VR

5GND

6A.+4V

7GND

8A.-4V

9GND

10HP RCH OUT

11GND

12HP LCH OUT

10P

CN051

1GND

2TXD

3GND

4RXD

5GND

6DTR

7GND

8DSR

9GND

10+VCC

10P

CN001

1 +VCC

2 GND

3 DSR

4 GND

5 DTR

6 GND

7 RXD

8 GND

9 TXD

10 GND

86429

7

531

13 14

A

B

C

D

E

F

G

H

I

J

123456789101112

RE-32
BOARD

FR-136 BOARD

HP-100 BOARD

RS-78
BOARD

DCD

RXD

DTR

GND

TXDRDRTS

CTS

DSR

CN002

9P

REMOTE
RS-232C

L

K

M

N

05

VA-102 BOARD (2/2)

DSR-20MD/20MDP

4-7 4-8

REC/PB AMP

RP-228

• For Printed Wiring Board.

• RP-228 board is six-layer print board. However, the patterns
of layers 2 to 5 have not been included in the diagram.

• There are few cases that the part isn't mounted in this model
is printed on this diagram.

• See page 4-125 for printed parts location.

• Chip transistor

EB

C

1-668-406-

05

RP-228

BOARD (SIDE A)

A

B

C

D

123456

12

1

2

3

4

6

8

7

9

5

KA

AK

C
C

1

2

19

20

4-2. PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS

RP-228 (REC/PB AMP) PRINTED WIRING BOARD

– Ref. No.: RP-228 board; 3,000 series –