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Order NO. VR0404003C1
B24

Video Cassette Mechanism

R4-MECHANISM of DMR
series for North America Model

INTRODUCTION
The R4-Mechanism chassis are built in several Panasonic DVD Video Recorders
for North American market from year 2004.

This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service
or repair the product or products dealt with in this service information by anyone else could result in serious injury or death.

2004 Matsushita Electric Industrial Co., Ltd.
All rights reserved. Unauthorized copying and
distribution is violation of law.

1
CONTENTS
CONTENTS.......................................................................................................................................................... 2
1. OUTLINE OF R4 MECHANISM ....................................................................................................................... 4
1.1. FEATURES................................................................................................................................................ 4
1.2. THE TAPE TRANSPORT PATH ................................................................................................................ 4
1.3. PARTS NAME OF R4-MECHANISM......................................................................................................... 5
1.4. NEW DD CYLINDER UNIT ....................................................................................................................... 7
FEATURE ......................................................................................................................................................... 7
1.5. PG SHIFTER AUTOMATIC ADJUSTMENT.............................................................................................. 8
1.5.1. ADJUSTMENT PROCEDURE............................................................................................................ 8
1.5.2. (VHS) X-VALUE & LINEARITY (P2 and P3 Posts) ADJUSTMENT ................................................... 9
2. REMOVAL OF CASSETTE TAPE............................................................................................................... 10
2.1. Removal by compulsory unloading. ........................................................................................................ 10
2.2. Removal by manual operation by rotating the Loading Motor with the batteries.................................... 10
Take out Cassette Tape manually after removing the mechanism..................................................................11
3. REMOVAL OF CASSETE HOLDER UNIT & MECHANISM CHASSIS......................................................... 12
3.1. Top Case.................................................................................................................................................. 12
3.2. Front Panel .............................................................................................................................................. 12
3.3. VTR Mechanism Unit............................................................................................................................... 13
3.3.1. Caution for attaching VTR Mechanism Unit ..................................................................................... 13
3.4. REMOVAL OF CASSETTE HOLDER UNIT............................................................................................ 14
4. DISASSEMBLY /ASSEMBLY METHOD FOR MECHANISM ........................................................................ 15
4-1. DISASSEMBLY OF MECHANISM .......................................................................................................... 15
4.2. ASSEMBLY AND PHASE ADJUSTMENT OF MECHANISM..................................................................... 19
5. MECHANICAL ADJUSTMENT PROCEDURE............................................................................................... 28
5.1. P2 AND P3 POST ADJUSTMENT (PREADJUSTMENT)....................................................................... 28
5.2. TAPE INTERCHANGEABILITY ADJUSTMENT..................................................................................... 28
5.2.1. P2 AND P3 POST ADJUSTMENT.................................................................................................... 28
5.2.2. ADJUSTMENT OF P4 POST............................................................................................................ 30
5.2.3. HEIGHT ADJUSTMENT OF A/C HEAD ........................................................................................... 31
5.2.4. FINE-ADJUSTMENT OF A/C HEAD ................................................................................................ 31
5.2.5. ADJUSTMENT OF X-VALUE (PREADJUSTMENT) ........................................................................ 31
5.2.6. FINE-ADJUSTMENT OF X-VALUE .................................................................................................. 32
Servicing Fixture & Tools.................................................................................................................................... 33
6. SERVICE INFORMATION DISPLAY ............................................................................................................. 34
6.1. Purpose of Service Information Display .................................................................................................. 34
6.2. Turning on Service Information Display................................................................................................... 34
7. SELF- DIAGNOSIS INDICATION DISPLAY .................................................................................................. 36
Example of Error Indication on the FIP .............................................................................................................. 36
Division of Management..................................................................................................................................... 36
7.1. TABLE OF DETECTING CONDITION AND MOVEMENT OF MECHANISM IN DETECTING OF THE

2
SELF-DIAGNOSIS FUNCTION...................................................................................................................... 37
.7.2. MEMORY OF THE SELF-DIAGNOSIS HISTORY AND THE SUPPLEMENTARY DATA.................... 40
7.2.1. Error Number and Supplementary Data ........................................................................................... 40
7.2.2. Condition for memorizing of the self-diagnosis history..................................................................... 41
7.2.3. Condition for clearing the self-diagnosis history............................................................................... 41
7.2.4. Indication of the self-diagnosis history. ............................................................................................. 41
7.3. MEMORY TIMING FOR ERROR NO. F03 & F04................................................................................... 42
7.3.1. Mechanism lock during the mechanism initial operation cause of a mechanism lock..................... 42
7.3.2. The mechanism lock during the mechanism initial operation with returning from an Error or the
power failure................................................................................................................................................ 42
7.4. ANALIZING PROCEDURE FOR MECHANISM ERROR........................................................................ 42
9. TIMING CHART OF MODE SW..................................................................................................................... 44
10. SYSTEM CONTROL CIRCUIT .................................................................................................................... 45
10.1. MODE TRANSITION............................................................................................................................. 45
10.1.1. Basic mode action (without EDIT function)..................................................................................... 45
10.1.2. Basic mode action (with EDIT function).......................................................................................... 45
10.2. BASIC ACTION IN MECHANISM ......................................................................................................... 46
10.2.1. Position SW and main action at each position............................................................................... 46
10.2.2. Mechanism initializing action at each position................................................................................ 46
10.2.3. Mechanism action in sand-by condition after cassette is inserted ................................................. 46
10.2.4. Mechanism action in EJECT operation .......................................................................................... 46
10.3. SUPPLY AND TAKE-UP SENSORS .................................................................................................... 47
10.3.1. Detection timing .............................................................................................................................. 47
10.3.2. Sensitivity of detecting the start and end edges of tape................................................................. 47
10.3.3. Action after start and end edges are detected................................................................................ 47
10.4. SAFETY TAB SWITCH ......................................................................................................................... 47
10.5. SAFETY TIMER..................................................................................................................................... 48
10.5.1. Holding time of special playback and stand-by mode .................................................................... 48
10.5.2. Detecting mechanism lock during mode shift................................................................................. 48
10.5.3. Detecting reel lock .......................................................................................................................... 48
10.5.4. Detecting cylinder lock.................................................................................................................... 49
10.6. Automatic features ................................................................................................................................. 49
11. MOTOR DRIVE SECTION ........................................................................................................................... 50
11.1. CAPSTAN DRIVE CIRCUIT .................................................................................................................. 50
11.1.1. R4 Mechanism employs Full time Full-wave drive method ............................................................ 50
11.1.2. R4 Mechanism employs PWM (Pulse Width Motor) as Capstan Motor Drive Signal in REC or
PLAYBACK mode ....................................................................................................................................... 51
11.2.CYLINDER DRIVE AND LOADING MOTOR DRIVE CIRCUIT ............................................................. 53

3
1. OUTLINE OF R4 MECHANISM
1.1. FEATURES
Item R4-Mechanism
Pieces of the Components 125 pieces
DD Cylinder Corresponding heads: 2 ~ 10ch
Weight: 76%
FF/REW speed 600 / 400 times
Capstan drive IC, Cylinder drive IC, Loading All new ICs
motor drive IC
Capstan Unit PWM Drive
Cylinder Unit RDD
Phase adjustment place 5 places
Slot in unit Sector gear drive

1.2. THE TAPE TRANSPORT PATH

S-INCLIND POST T-INCLIND POST
P2 POST P3 POST

CYLINDER

FE HEAD
AE HEAD

TENSIO P0
A/C HEAD PINCH ROLLER
N POST
C1
P4 POST C3

C2
CAP C4
P5

Fig.M1

4
1.3. PARTS NAME OF R4-MECHANISM

Fig.M2

5
Ref. No. Part Name Ref. No. Part Name
101 CYLINDER UNIT 143 SCREW
102 CAPSTAN UNIT 143 SCREW
103 FE HEAD 144 SCREW
104 TENSION ARM BOSH 144 SCREW
105 INTERMEDIATE GEAR 144 SCREW
106 MAIN CAM GEAR 145 SCREW
107 IDLER GEAR 145 SCREW
107 IDLER GEAR 146 SCREW
108 CHANGE GEAR 147 SCREW
109 REEL TABLE 148 SCREW
109 REEL TABLE 148 SCREW
110 CAPSTAN BELT 149 WASHER
111 LOADING MOTOR UNIT 150 WASHER
112 CHANGE GEAR SPRING 151 WASHER
113 WORM SHAFT HOLDER 152 WASHER
114 OPENER PIECE
115 LED PRISM
116 MAIN LEVER
117 PINCH CHARGE ARM
118 IDLER ARM
119 P4 CAP
120 SUPPLY SHAFT HOLDER UNIT
121 TAKE UP SHAFT HOLDER UNIT
122 AC HEAD UNIT
122-1 SCREW
122-1 SCREW
122-2 SCREW
124 SUPPLY LOADING ARM UNIT
125 TAKE UP LOADING ARM UNIT
126 PINCH ARM UNIT
127 P5 ARM UNIT
128 TENSION ARM UNIT
128-1 TENSION SPRING
129 SUPPLY BRAKE ARM UNIT
130 TAKE UP BRAKE ARM UNIT
130-1 TAKE UP BRAKE SPRING
131 CHANGE LEVER UNIT
132 CENTRE CLUTCH UNIT
133 TORQUE CLUTCH UNIT
134 TOP PLATE
135 SIDE PLATE (L)
136 SIDE PLATE

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