Jvc SR-VS20-EK, SR-VS20-E Schematic

SERVICE MANUAL

Mini DV/S-VHS VIDEO CASSETTE RECORDER

VICTOR COMPANY OF JAPAN, LIMITED
VIDEO DIVISION

S40894

SR-VS20E/EK

SPECIFICATIONS

GENERAL

Power requirement : AC 220 V – 240 V`, 50 Hz/60 Hz
Power consumption

Temperature
Operating : 5°C to 40°C
Storage : –20°C to 60°C
Operating position : Horizontal only
Dimensions (WxHxD) : 435 mm x 124 mm x 391 mm
Weight : 6.7 kg
Input/Output : 21-pin SCART connectors :

VHS DECK VIDEO/AUDIO

Signal system : PAL-type colour signal and CCIR monochrome

Recording system : DA4 (Double Azimuth) head helical scan system
Format : S-VHS/VHS PAL standard
Signal-to-noise ratio : 45 dB
Horizontal resolution

No. 82842

Frequency range : 70 Hz to 10,000 Hz (Normal audio)

Maximum recording time

SR-VS20E/EK

TV

VHS

DV

CABLE/SAT

– –:– –

LCD PROG

1

AUDIO

TV/VCR

2

123

3

456

DAILY/QTDN.

VPS/PDC

WEEKLY/HEBDO

4

789

4

0000

AUX

MENU

0

ENTER/ENTREE

OK

1

PROG

30

SEC

3

2

START

STOP

DATE

PR

DEBUT

FIN

EXPRESS

P

V

R

T

+

T

+

V

V

–

T

–

T

R

V

P

(The specifications shown pertain specifically to the model SR-VS20E)

Power on : 33 W
Power off : 7.9 W

IN/OUT x 1, IN/DECODER x 1
RCA connectors:
VIDEO IN x 1, AUDIO IN x 1, AUDIO OUT x 1
S-Video connectors: IN x 1, OUT x 1
DV connector: IN/OUT x 1
(4-pin, IEEE1394 conformity, digital input/output)

signal, 625 lines 50 fields

(SP/LP) : 250 lines (VHS)

400 lines (S-VHS)

(EP) : 220 lines (VHS)

350 lines (S-VHS)

20 Hz to 20,000 Hz (Hi-Fi audio)

(SP) : 240 min. with E-240 video cassette
(LP) : 480 min. with E-240 video cassette
(EP) : 720 min. with E-240 video cassette

DV IN/OUT

ENTREE/SORTIE DV

VHSDV

A.DUBINSERT

DUB

COPIE

PR

DV VHS

DV DECK VIDEO/AUDIO

Signal system : PAL-type colour signal, 625 lines 50 fields
Recording system : Digital Component Recording
Format : DV format (SD mode)
Cassette : Mini DV Cassette
Maximum recording time

(LP) : 90 min. with M-DV60ME cassette
Audio recording system

TUNER/TIMER

TV channel storage
capacity : 99 positions

Tuning system : Frequency synthesized tuner
Channel coverage : VHF 47 MHz – 89 MHz/

Memory backup time : Approx. 60 min.

ACCESSORIES

Provided accessories : RF cable,

Specifications shown are for SP mode unless otherwise specified.
E.& O.E. Design and specifications subject to change without notice.

S-VHS ET

STARTR.A.EDIT

IN/OUT

PULL-OPEN

(SP) : 60 min. with M-DV60ME cassette

: PCM 48 kHz, 16 bit (2 ch)/

32 kHz, 12 bit (4 ch)

(+AUX position)

104 MHz – 300 MHz/
302 MHz – 470 MHz

UHF 470 MHz – 862 MHz

21-pin SCART/RCA cable,
BNC/RCA adapter x 2,
Satellite Controller RM-SD1,
Infrared remote control unit,
"R6" battery x 2

625

Printed in Japan

This service manual is printed on 100% recycled paper.

COPYRIGHT © 2001 VICTOR COMPANY OF JAPAN, LTD.

No. 82842

January 2001

TABLE OF CONTENTS

Section Title Page Section Title Page

Important Safety Precautions
INSTRUCTIONS

1. DISASSEMBLY

1.1 HOW TO REMOVE THE MAJOR PARTS .................................................... 1-1

1.1.1 Introduction ............................................................................................ 1-1

1.2 HOW TO READ THE DISASSEMBLY AND ASSEMBLY .............................. 1-1

1.3 DISCONNECTION OF CONNECTORS (WIRES) ........................................ 1-1

1.4

SCREWS USED CABINET COMPONENTS AND BOARD ASSEMBLIES ..........

1.5 HOW TO REMOVE THE MAJOR PARTS <COM section> .......................... 1-2

1.5.1 Disassembly flow chart .......................................................................... 1-2

1.5.2 Disassembly/assembly method <COM section> ................................... 1-2

1.6 HOW TO REMOVE THE MAJOR PARTS <VHS section> ........................... 1-4

1.6.1 Disassembly flow chart .......................................................................... 1-4

1.6.2 DIsassembly/assembly method <VHS section> .................................... 1-4

1.7 HOW TO REMOVE THE MAJOR PARTS <DV section> .............................. 1-6

1.7.1 Disassembly flow chart .......................................................................... 1-6

1.7.2 Disassembly/assembly method <DV section> ....................................... 1-6

1.8 SERVICE POSITIONS .................................................................................. 1-8

1.8.1 Service position <VHS SIDE> ................................................................. 1-8

1.8.2 Service position <DV SIDE> .................................................................... 1-9

1.9 MECHANISM SERVICE MODE .................................................................. 1-10

1.9.1 How to set the "MECHANISM SERVICE MODE" ................................ 1-10

1.10 CONNECTION .......................................................................................... 1-11

1.11 EMERGENCY DISPLAY FUNCTION ........................................................ 1-13

1.11.1 Displaying the emergency information ................................................ 1-13

1.11.2 Clearing the emergency history ........................................................... 1-13

1.11.3 Emergency content description ........................................................... 1-14

1.11.4 Emergency detail information 1 .......................................................... 1-15

1.11.5 Emergency detail information 2 .......................................................... 1-16

2. MECHANISM ADJUSTMENT (VHS)

2.1 BEFORE STARTING REPAIR AND ADJUSTMENT ..................................... 2-1

2.1.1 Precautions ............................................................................................ 2-1

2.1.2 Checking for Proper Mechanical Operations ......................................... 2-1

2.1.3 Manually Removing the Cassette Tape ................................................. 2-1

2.1.4 Jigs and Tools Required for Adjustment................................................. 2-2

2.1.5 Maintenance and Inspection .................................................................. 2-3

2.2 REPLACEMENT OF MAJOR PARTS ........................................................... 2-6

2.2.1 Before Starting Disassembling (Phase matching between

mechanical parts) ................................................................................... 2-6

2.2.2 How to Set the Mechanism Assembling Mode ....................................... 2-6

2.2.3 Cassette Holder Assembly ..................................................................... 2-6

2.2.4 Pinch Roller Arm Assembly .................................................................... 2-8

2.2.5 Guide Arm Assembly and Press Lever Assembly .................................. 2-8

2.2.6 Audio Control Head................................................................................ 2-8

2.2.7 Loading Motor ........................................................................................ 2-8

2.2.8 Capstan Motor ....................................................................................... 2-9

2.2.9 Pole Base Assembly (supply or take-up side) ........................................ 2-9

2.2.10 Rotary Encoder .................................................................................. 2-10

2.2.11 Clutch Unit ......................................................................................... 2-10

Change Lever Assembly, Direct Gear, Clutch Gear and Coupling Gear .........

2.2.12

2.2.13 Link Lever .......................................................................................... 2-11

2.2.14 Cassette Gear, Control Cam and Worm Gear ................................... 2-11

2.2.15 Control Plate ...................................................................................... 2-11

2.2.16

Loading Arm Gear (supply or take-up side) and Loading Arm Gear Shaft ..........

2.2.17 Take-up Lever, Take-up Head and Control Plate Guide .................... 2-13

2.2.18 Capstan Brake Assembly .................................................................. 2-13

2.2.19 Sub Brake Assembly (take-up side) .................................................. 2-13

2.2.20 Main Brake Assembly (take-up side), Reel Disk (take-up side)

and Main Brake Assembly (supply side) ............................................ 2-13

2.2.21 Tension Brake Assembly, Reel Disk (supply side) and

Tension Arm Assembly ...................................................................... 2-14

2.2.22 Idler Lever, Idler Arm Assembly ......................................................... 2-14

2.2.23 Stator Assembly ................................................................................. 2-14

2.2.24 Rotor Assembly ................................................................................. 2-14

2.2.25 Upper Drum Assembly ....................................................................... 2-15

2.3 COMPATIBILITY ADJUSTMENT ................................................................ 2-16

2.3.1 Checking/Adjustment of FM Waveform Linearity ................................. 2-16

Checking/Adjustment of the Height and Tilt of the Audio Control Head ........

2.3.2

2.3.3

Checking/Adjustment of the Audio Control Head Phase (X-Value) .........

2.3.4 Checking/Adjustment of the Standard Tracking Preset ....................... 2-18

2.3.5 Checking/Adjustment of the Tension Pole Position .............................. 2-18

MECHANISM ADJUSTMENT (DV)

2.9 PREPARATION ........................................................................................... 2-21

2.9.1 Precautions .......................................................................................... 2-21

2.9.2 Tools Required for Adjustments ........................................................... 2-21

2.9.3 Disassembly and Assembly Procedures .............................................. 2-21

2.9.4 Screws and Washers Used in Disassembly/Assembly of the

Mechanism Assembly .......................................................................... 2-21

2.10 DISASSEMBLY/ASSEMBLY OF THE MECHANISM ASSEMBLY ............. 2-22

2.10.1 Introduction ........................................................................................ 2-22

2.10.2 Mechanism Modes ............................................................................ 2-22

2.11 MECHANISM TIMING CHART .................................................................. 2-24

2.12 MECHANISM ASSEMBLY/DISASSEMBLY PROCEDURE TABLE ........... 2-25

2.13 DISASSEMBLY/ASSEMBLY ...................................................................... 2-27

2.14 LIST OF PROCEDURES FOR DISASSEMBLY ........................................ 2-35

2.15 MECHANISM DISASSEMBLY/ASSEMBLY SHEET .................................. 2-36

2.16 MECHANISM PHASE CHECK/ADJUSTMENT ......................................... 2-38

2.17 POSITIONING THE TENSION POLE ........................................................ 2-39

2.18 COMPATIBILITY AND ERROR RATE ADJUSTMENTS ............................ 2-40

2.18.1 Preparation ........................................................................................ 2-40

2.18.2 Adjustment ......................................................................................... 2-40

2.18.3 Linearity adjustment .......................................................................... 2-41

2.18.4 PB switching point adjustment ........................................................... 2-41

2.18.5 Error rate adjustment ......................................................................... 2-41

2.18.6 Error rate measuring method ............................................................. 2-41

2.19 TAPE EJECTION ....................................................................................... 2-42

1-1

2-10

2-12

2-17
2-17

3. ELECTRICAL ADJUSTMENT (VHS)

3.1 PRECAUTION .............................................................................................. 3-1

3.1.1 Required test equipments ...................................................................... 3-1

3.1.2 Required adjustment tools ..................................................................... 3-1

3.1.3 Color (colour) bar signal,Color (colour) bar pattern ............................... 3-1

3.1.4 Switch settings and standard precautions ............................................. 3-1

3.1.5 EVR Adjustment ..................................................................................... 3-1

3.2 SERVO CIRCUIT .......................................................................................... 3-2

3.2.1 Switching point ....................................................................................... 3-2

3.2.2 Slow tracking preset ............................................................................... 3-2

3.3 VIDEO CIRCUIT ........................................................................................... 3-2

3.3.1 D/A level ................................................................................................. 3-2

3.3.2 EE Y level ............................................................................................... 3-3

3.3.3 PB Y level (S-VHS / VHS) ...................................................................... 3-3

3.3.4 REC color (colour) level ......................................................................... 3-3

3.3.5 Video EQ (Frequency response) ........................................................... 3-4

3.3.6 AUTO PICTURE initial setting ............................................................... 3-4

3.3.7 DV EE Y level ......................................................................................... 3-4

3.4 AUDIO CIRCUIT ........................................................................................... 3-5

3.4.1 Audio REC FM ....................................................................................... 3-5

3.5 SYSCON CIRCUIT [SR-VS20E] ................................................................... 3-5

3.5.1 Timer clock ............................................................................................. 3-5

ELECTRICAL ADJUSTMENT (DV)

3.6 PREPARATION ............................................................................................. 3-6

3.6.1 Precautions ............................................................................................ 3-6

3.6.2 Equipment required for adjustment ........................................................ 3-6

3.6.3 Tools required for adjustments ............................................................... 3-6

3.6.4 Setup ...................................................................................................... 3-6

4. CHARTS AND DIAGRAMS

NOTES OF SCHEMATIC DIAGRAM ................................................................... 4-1

CIRCUIT BOARD NOTES .................................................................................... 4-2

4.1 BOARD INTERCONNECTIONS ................................................................... 4-3

SWITCHING REGULATOR AND REGULATOR SCHEMATIC DIAGRAMS ..........

4.2

4.3 VIDEO/AUDIO SCHEMATIC DIAGRAM ....................................................... 4-7

4.4 SYSTEM CONTROL SCHEMATIC DIAGRAM ............................................. 4-9

4.5 SUB CPU SCHEMATIC DIAGRAM ............................................................ 4-13

4.6 TUNER SCHEMATIC DIAGRAM ................................................................ 4-15

4.7 VIDEO I/O SWITCH SCHEMATIC DIAGRAM ............................................ 4-17

4.8 AUDIO I/O SCHEMATIC DIAGRAM ........................................................... 4-19

4.9 CONNECTION SCHEMATIC DIAGRAM .................................................... 4-21

4.10 3D DIGITAL/2M SCHEMATIC DIAGRAM ................................................. 4-23

4.11 TERMINAL SCHEMATIC DIAGRAM ........................................................ 4-25

4.12 DEMODULATOR SCHEMATIC DIAGRAM .............................................. 4-27

4.13 S-SUB SCHEMATIC DIAGRAM ............................................................... 4-29

4.14 MDA SCHEMATIC DIAGRAM .................................................................. 4-31

4.15 PRE/REC SCHEMATIC DIAGRAM .......................................................... 4-33

4.16 ON SCREEN SCHEMATIC DIAGRAM ..................................................... 4-35

DISPLAY, EJECT SW, LED/SW, JACK AND JOG SCHEMATIC DIAGRAMS .........

4.17

4.18 DV SYSTEM CONTROL SCHEMATIC DIAGRAM ................................... 4-39

4.19 DV MSD SCHEMATIC DIAGRAM ............................................................ 4-41

4.20 DV MAIN SCHEMATIC DIAGRAM ........................................................... 4-43

4.21 DV I/O SCHEMATIC DIAGRAM ............................................................... 4-45

4.22 DV V OUT SCHEMATIC DIAGRAM ......................................................... 4-47

4.23 AUDIO AD/DA SCHEMATIC DIAGRAM ................................................... 4-49

4.24 DV DSP SCHEMATIC DIAGRAM ............................................................. 4-51

4.25

SWITCHING REGULATOR AND REGULATOR CIRCUIT BOARDS ..........

4.26 3D DIGITAL/2M AND S-SUB CIRCUIT BOARDS .................................... 4-55

4.27 TERMINAL CIRCUIT BOARD .................................................................. 4-56

4.28 MAIN CIRCUIT BOARD ........................................................................... 4-57

4.29 DEMODULATOR AND ON SCREEN CIRCUIT BOARDS........................ 4-60

4.30

DISPLAY, EJECT SW, JACK, LED/SW AND JOG CIRCUIT BOARDS ..........

4.31 PRE/REC MDA CIRCUIT BOARD............................................................ 4-63

4.32 DV MAIN CIRCUIT BOARD ..................................................................... 4-65

4.33 FDP GRID ASSIGNMENT AND ANODE CONNECTION ......................... 4-71

4.34 REMOTE CONTROL SCHEMATIC DIAGRAM ........................................ 4-72

4.35 WAVEFORMS ........................................................................................... 4-73

4.36 VOLTAGE CHARTS.................................................................................. 4-75

4.37 CPU PIN FUNCTION................................................................................ 4-78

4.38 SYSTEM CONTROL BLOCK DIAGRAM (VHS) ....................................... 4-79

4.39 VIDEO BLOCK DIAGRAM(VHS) .............................................................. 4-81

4.40 AUDIO BLOCK DIAGRAM (VHS)............................................................. 4-85

4.41 SYSTEM CONTROL BLOCK DIAGRAM (DV) ......................................... 4-87

4.42 VIDEO BLOCK DIAGRAM (DV) ............................................................... 4-89

5. PARTS LIST

5.1 PACKING AND ACCESSORY ASSEMBLY <M1> ....................................... 5-1

5.2 FINAL ASSEMBLY <M2> ............................................................................. 5-2

5.3 MECHANISM ASSEMBLY (VHS) <M3> ...................................................... 5-4

5.4 MECHANISM ASSEMBLY (DV) <M4>......................................................... 5-6

5.5 ELECTRICAL PARTS LIST ........................................................................... 5-8

SW REGULATOR BOARD ASSEMBLY <01> ................................................... 5-8

REGULATOR BOARD ASSEMBLY <02> .......................................................... 5-9

MAIN BOARD ASSEMBLY <03> ..................................................................... 5-10

3D DIGITAL/2M BOARD ASSEMBLY <05> ..................................................... 5-18

TERMINAL BOARD ASSEMBLY <06> ............................................................ 5-19

AUDIO CONTROL HEAD BOARD ASSEMBLY <12> ..................................... 5-21

DEMOD BOARD ASSEMBLY <14> ................................................................. 5-21

S-SUB BOARD ASSEMBLY <15> ................................................................... 5-22

DV PRE/REC MDA BOARD ASSEMBLY <16> ............................................... 5-23

ON SCREEN BOARD ASSEMBLY <17> ......................................................... 5-24

EJECT SW BOARD ASSEMBLY <27> ............................................................ 5-25

SW/DISPLAY BOARD ASSEMBLY <28> ........................................................ 5-25

JACK BOARD ASSEMBLY <36> ..................................................................... 5-26

LED/SW BOARD ASSEMBLY <47> ................................................................ 5-26

DV MAIN BOARD ASSEMBLY <50> ............................................................... 5-26

LOADING MOTOR BOARD ASSEMBLY <55> ............................................... 5-32

JOG BOARD ASSEMBLY <85> ....................................................................... 5-32

4-5

4-37

4-53

4-61

The following table lists the differing points between Models (SR-VS20EK and SR-VS20E) in this series.

SR-VS20EK SR-VS20E

VIDEO SYSTEM PAL/NTSC PB ON PAL TV PAL/MESECAM(MANUAL)/NTSC PB ON PAL TV
TUNER (BROADCASTING STANDARD) I B/G, D/K
TUNER (STEREO DECODER) NICAM NICAM/A2
DISPLAY (LANG.) ENGLISH 3 LANGUAGE
TIMER (VCR PLUS+) VIDEO PLUS+ DELUXE SHOW VIEW DELUXE
TIMER (VPS) NOT USED USED

Important Safety Precautions

Prior to shipment from the factory, JVC products are strictly inspected to conform with the recognized product safety and electrical codes of the
countries in which they are to be sold. However, in order to maintain such compliance, it is equally important to implement the following precautions
when a set is being serviced.

Precautions during Servicing

•

1. Locations requiring special caution are denoted by labels and in­scriptions on the cabinet, chassis and certain parts of the product.
When performing service, be sure to read and comply with these
and other cautionary notices appearing in the operation and serv­ice manuals.

2. Parts identified by the ! symbol and shaded ( ) parts are
critical for safety.
Replace only with specified part numbers.

Note: Parts in this category also include those specified to com-

ply with X-ray emission standards for products using
cathode ray tubes and those specified for compliance
with various regulations regarding spurious radiation
emission.

3. Fuse replacement caution notice.
Caution for continued protection against fire hazard.
Replace only with same type and rated fuse(s) as specified.

4. Use specified internal wiring. Note especially:

1) Wires covered with PVC tubing

2) Double insulated wires

3) High voltage leads

5. Use specified insulating materials for hazardous live parts. Note
especially:

1) Insulation Tape 3) Spacers 5) Barrier

2) PVC tubing 4) Insulation sheets for transistors

6. When replacing AC primary side components (transformers, power
cords, noise blocking capacitors, etc.) wrap ends of wires securely
about the terminals before soldering.

12. Crimp type wire connector
In such cases as when replacing the power transformer in sets
where the connections between the power cord and power trans­former primary lead wires are performed using crimp type connec­tors, if replacing the connectors is unavoidable, in order to prevent
safety hazards, perform carefully and precisely according to the
following steps.

1) Connector part number : E03830-001

2) Required tool : Connector crimping tool of the proper type which

will not damage insulated parts.

3) Replacement procedure

(1) Remove the old connector by cutting the wires at a point

close to the connector.
Important : Do not reuse a connector (discard it).

cut close to connector

Fig.3

(2) Strip about 15 mm of the insulation from the ends of the

wires. If the wires are stranded, twist the strands to avoid
frayed conductors.

15 mm

Fig.1

7. Observe that wires do not contact heat producing parts (heatsinks,
oxide metal film resistors, fusible resistors, etc.)

8. Check that replaced wires do not contact sharp edged or pointed
parts.

9. When a power cord has been replaced, check that 10-15 kg of
force in any direction will not loosen it.

Power cord

Fig.2

10. Also check areas surrounding repaired locations.

11. Products using cathode ray tubes (CRTs)
In regard to such products, the cathode ray tubes themselves, the
high voltage circuits, and related circuits are specified for compli­ance with recognized codes pertaining to X-ray emission.
Consequently, when servicing these products, replace the cath­ode ray tubes and other parts with only the specified parts. Under
no circumstances attempt to modify these circuits.
Unauthorized modification can increase the high voltage value and
cause X-ray emission from the cathode ray tube.

Fig.4

(3) Align the lengths of the wires to be connected. Insert the

wires fully into the connector.

Metal sleeve

Connector

Fig.5

(4) As shown in Fig.6, use the crimping tool to crimp the metal

sleeve at the center position. Be sure to crimp fully to the
complete closure of the tool.

1.25

2.0

5.5

Fig.6

(5) Check the four points noted in Fig.7.

Not easily pulled free

Wire insulation recessed

more than 4 mm

Fig.7

Crimping tool

Crimped at approx. center

of metal sleeve

Conductors extended

I

S40888-01

Safety Check after Servicing

•

Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts and wires have been returned
to original positions, Afterwards, perform the following tests and confirm the specified values in order to verify compliance with safety
standards.

1. Insulation resistance test

Confirm the specified insulation resistance or greater between power cord plug prongs and exter­nally exposed parts of the set (RF terminals, antenna terminals, video and audio input and output
terminals, microphone jacks, earphone jacks, etc.). See table 1 below.

2. Dielectric strength test

Confirm specified dielectric strength or greater between power cord plug prongs and exposed acces­sible parts of the set (RF terminals, antenna terminals, video and audio input and output terminals,
microphone jacks, earphone jacks, etc.). See table 1 below.

3. Clearance distance

When replacing primary circuit components, confirm specified clearance distance (d), (d’) be­tween soldered terminals, and between terminals and surrounding metallic parts. See table 1
below.

Fig. 8

4. Leakage current test

Confirm specified or lower leakage current between earth ground/power cord plug prongs and
externally exposed accessible parts (RF terminals, antenna terminals, video and audio input and
output terminals, microphone jacks, earphone jacks, etc.).
Measuring Method : (Power ON)
Insert load Z between earth ground/power cord plug prongs and externally exposed accessible
parts. Use an AC voltmeter to measure across both terminals of load Z. See figure 9 and following
table 2.

Externally
exposed
accessible part

Fig. 9

Z

V

ab

A

c

5. Grounding (Class 1 model only)

Confirm specified or lower grounding impedance between earth pin in AC inlet and externally exposed accessible parts (Video in, Video out,
Audio in, Audio out or Fixing screw etc.).

Measuring Method:

Connect milli ohm meter between earth pin in AC inlet and exposed accessible parts. See figure 10 and grounding specifications.

Fig. 10

Table 1 Specifications for each region

Table 2 Leakage current specifications for each region

Note: These tables are unofficial and for reference only. Be sure to confirm the precise values for your particular country and locality.

II

S40888-01

SECTION 1

DISASSEMBLY

1.1 HOW TO REMOVE THE MAJOR PARTS

1.1.1 Introduction

This set is a double-deck video recorder integrating a Mini DV
deck and a VHS deck. Its internal structure is divided into three
sections that include the power supply, VHS and DV sections.
Therefore, the removal of major parts will also be described
under three separate sections as listed below.

1. COMMON section

2. VHS section

3. DV section

< TOP VIEW >

1. COMMON section

3. DV section

2. VHS section

Fig. 1-1-1

1.2 HOW TO READ THE DISASSEMBLY AND ASSEMBLY

Step/

Loc No.

1

Top cover, Bracket COM1

Front panel

2

assembly

Fig. No.

4(S1), 3(S2), 2(L1), (L2)
2(S3)

COM2 8(L3),

CN7507(WR1),
CN3011(WR2)

Point NotePart name

—

<Note
1,2,3,4>

§§ §§ §

(1) (2) (3) (4) (5)

(1) Order of steps in Procedure

When reassembling, perform the step(s) in the reverse order.
These numbers are also used as the identification (location) No.

of parts Figures.
(2) Part name to be removed or installed.
(3) Fig. No. showing procedure or part location.
(4) Identification of part to be removed, unhooked, unlocked,

released, unplugged, unclamped or unsoldered.

P= Spring, W= Washer, S= Screw, L= Locking tab, SD= Solder,

CN**(WR**)= Remove the wire (WR**) from the connector

(CN**).

Note:

• The bracketed ( ) WR of the connector symbol are as-

signed nos. in priority order and do not correspond to
those on the spare parts list.

(5) Adjustment information for installation

1.3 DISCONNECTION OF CONNECTORS (WIRES)

FPC

CONNECTOR

FPC

CONNECTOR

Fig. 1-3-1 Fig. 1-3-2

FPC

CONNECTOR

FPC

CONNECTOR

Fig. 1-3-3 Fig. 1-3-4

FPC

CONNECTOR

Fig. 1-3-5

1.4 SCREWS USED CABINET COMPONENTS AND BOARD ASSEMBLIES

Table 1-4-1 below shows the symbols, shapes, colors and
part numbers of screw that are used in the cabinet compo­nents and board assemblies and are appearing in the disas­sembling/reassembling diagrams in this manual.
When screwing them again in reassembling, be sure to use
them correctly referring to the following table.

Notes:

• Screw that are asterisked (marked with*) in the shape col-

umn are fixed with screw lock agent. If such the screw is
once removed, never use it again.

• The Screw symbols are assigned nos. in priority order and

do not correspond to those on the spare parts list.

SYMBOL PARTS NO. COLOR

S1 QYTDST3006R SILVER BLACK

S2 QYTDST3006M BLACK

S3 QYTDSF3010Z GOLD

S4 QYTDSF2606Z GOLD

S5 QYTDST3006Z GOLD

S6 QYTDSF3008M BLACK

S7 QYTDST2610Z GOLD

S8 PQ21623-2-5 GOLD

S9 PQ40413 BLACK

S10 LP40700-001A BLACK
S11 QYTDSP2004Z GOLD
S12 QYTDST2004Z GOLD
S13 YQ43893 SILVER

Table 1-4-1

1-1

HOW TO REMOVE THE MAJOR PARTS <COM section>

1.5

1.5.1 Disassembly flow chart

This flowchart shows the disassembly procedure for the ex­terior parts and electrical parts.
Basically, reverse this procedure when assembling them.

1 Top cover, Bracket

<Note 5>

When removing the SW REG board assembly or Regula­tor board assembly, unhook the several spacers connect­ing it with pliers from the top side.

<Note 6>

Perform the work by leaving fan motor attached to the rear
cover except when replacing the fan motor.
When attaching the rear cover, please be careful with the
wiring.

2 Front panel assembly

Display board assembly, Display/SW board assembly,

3

SW board assembly, LED1, 2 board assembly

4 SW REG board assembly

5 Regulator board assembly

6 Rear cover

Disassembly/assembly method <COM section>

1.5.2

Step/

Loc No.

Top cover, Bracket COM1

1

Front panel

2

assembly

Fig. No.

4(S1), 3(S2), 2(L1), (L2)
2(S3)

COM2 8(L3),

CN7507(WR1),

Point NotePart name

<Note
1,2,3,4>

CN3011(WR2)

Display board assembly,

3

LED/SW board assembly,
Eject SW board assembly,
Jack board assembly,
Jog board assembly

SW REG board

4

assembly

Regulator board

5

assembly

COM3 10(S4)

6(S4), Knob(Jog),
Knob(Shuttle),

COM4 2(S5), 2(L4), (L5)

CN5301(WR3),

COM5 3(L6),

CN5322(WR4),
CN5321(WR5),

<Note 1,
5>

<Note 1,
5>

CN5325(WR6),
CN5324(WR7),
CN5323(WR8)

6

COM6 4(S2), 6(S6),

Fan motor

<NOTE 6>Rear cover

<Note 1>

When attaching the FPC, be sure to connect it in the cor­rect orientation.

<Note 2>

When attaching the front panel assy, make sure that the
door openers of both decks (DV, VHS) are in the down
position.

<Note 3>

When attaching the front panel assy, be careful not to dam­age the DV terminals.

<Note 4>

When attaching the FPC take care that it is not caught.
Pass the DV-side FPC between the base (2) and DV Main
board assy.
Pass the two VHS-side FPCs below the base (1).

(S3)

6

(S2)

9

Bracket

1

5

(S2)

(S1)

7

(S2)

4

(S1)

3

Top cover

(L2)

8

(S3)

1

1

(S1)

(L1)

2

(S1)

—

—

Fig. COM1

<Note 4>

FPC

<Note 2>

DV SIDE

Base (2)

<Note 3>

DV Main board
assembly

(L3)

(L3)

Base (1)

(L3)

CN3011

<Note 4>

WR2

WR1

(L3)

CN7507

<Note 1>
Supporting
tape side

<Note 2>
VHS SIDE

2

Fig. COM2

1-2

<Note 6>
Fan Motor

6

28

(S2)

29

(S2)

33

(S6)

32

(S6)

35

(S6)

34

(S6)

36

(S6)

37

(S6)

30

(S2)

31

(S2)

22

5

CN5325

CN5324

WR8

WR5
Foil side
<Note 1>

WR4
Foil side
<Note 1>

WR6

WR7

CN5321

CN5322

(L6)
Spacer
<Note 5>

(L6)

Spacer

<Note 5>

CN5323

(S4)

21

(S4)

(S4)

2

Knob (Jog)

Knob (Shuttle)

3

Eject SW
board assembly

Jack board
assembly

11

(S4)

10

(S4)

Jog board assembly

LED/SW board
assembly

Display board
assembly

9

(S4)

20

(S4)

23

(S4)23(S4)

25

(S4)

24

16

(S4)

15

(S4)

14

(S4)

17

(S4)

(S4)

18

(S4)
13

(S4)

12

(L5)

26

(S5)

Fig. COM3

27

(S5)

Fig. COM5

WR3
Supporting
tape side
<Note 1>

4

CN5301

Spacer

<Note 5>

(L4)

Fig. COM4

Fig. COM6

1-3

HOW TO REMOVE THE MAJOR PARTS <VHS section>

1.6

1.6.1 Disassembly flow chart

This flowchart shows the disassembly procedure for the ex­terior parts and electrical parts.
Basically, reverse this procedure when assembling them.
However, it is required to remove the common section parts
as far as 1 “Top cover Bracket” and 2 “Front panel assem­bly” in advance. (See section 1.5.)

1 Drum assembly

2 Mechanism assembly

3 Main board assembly / 4 Base (1)

4 Base (1)

Procedures for Lowering the Cassette holder assembly

As the mechanism of this unit is integrated with the Housing
assembly, the holder must be lowered and the two screws un­screwed when removing the Mechanism assembly.

Fig. 2

Fig. 1

1.6.2 DIsassembly/assembly method <VHS section>

Step/

Loc No.

1

Drum assembly

(Inertia plate)
(Roller arm assy)

2

Mechanism
assembly

Main board

3 <Note 2>

assembly

Base (1) V4 (S3), 3(S5)4 —

Fig. No.

V1

Point NotePart name

3(S7), CON1(WR9),
CN1(WR10)

4(L1)

(P1), (L2)

V2

2(S8), (S9), (S10),
(L3), (L4),
CN1(WR11),

V3 6(S6), 2(S3), (S5),

CN5321(WR12),
CN5322(WR13),
CN3014(WR14),
CN703(WR15),
CN2601(WR16)

<Note 1,2>

<Note 2,4>

<Note 1>

When attaching or removing the FPC, take care not to dis­connect any of the wires.

<Note 2>

When attaching the FPC, be sure to connect it in the cor­rect orientation.

<Note 3>

When attaching wires, connect them in the correct orien­tation.

Fig. 3

Turn the loading motor pulley in the direction as indicated by
Fig.2. As both A and B levers are lodged twice, push the
levers in the direction as indicated by Fig.3 to release them.
When pushing the levers, do it in the order of A , B , B , A .
When the holder has been lowered, turn the pulley until the
cassette holder is securely in place without allowing any up/
down movement.

Procedures for Lowering the Cassette holder assembly

Note: When installing the Drum assembly, secure the

screws (S7) in the order of a , b , c .

Roller arm
assy

Inertia plate

(L1)

(P1)

(L2)

(S7)

1

a

2

(S7)

WR9
Foil side

c

<Note 2>

CON1

3

(S7)

b

WR10
Foil side
<Note 1,2>

1

Cleaner assy

<Note 4>

• When it is required to remove the screws (S8) retaining the
Mechanism assembly, please refer to the “Procedures for
Lowering the Cassette holder assembly”(See on page 1-5).

• When removing the Mechanism assembly only, unhook the
two spacers connecting it with the Main board assembly with
pliers from the back side of the Main board assembly first,
and then remove the Mechanism assembly.

• When reattaching the Mechanism assembly to the Main
board assembly, take care not to damage the sensors on
the Main board assembly (D3001: LED, Q3002: Start sen­sor, Q3003: End sensor, S3002: S cassette switch).

1-4

Not use

CN1

Fig. V1

Note: When installing the Mechanism assembly, secure

the screws (S8) in the order of a , b .

6

5

(S8)

<Note 4>

Mechanism assy

Spacer

(S9)

(L3)
Spacer
<Note 4>

4

(S8)

<Note 4>

S3002
S cassette switch
<Note 4>

WR11
Foil side
<Note 2>

(S10)

(L4)
Spacer
<Note 4>

7

2

15

(S3)

WR5
Foil side
<Note 2>

14

(S3)

3

WR4
Foil side
<Note 2>

CN3014

WR12
Foil side
<Note 2>

16

(S5)

WR13

9

(S6)

CN2601

CN703

8

(S6)

(S6)

CN5321

WR14
Foil side
<Note 2>

CN5322

10

(S6)

11

12

(S6)

13

(S6)

Fig. V3

<Note 4>

Fig. V2

17

(S3)

18

(S5)

19

(S5)

4

20

(S5)

Fig. V4

1-5

HOW TO REMOVE THE MAJOR PARTS <DV section>

1.7

1.7.1 Disassembly flow chart

This flowchart shows the disassembly procedure for the ex­terior parts and electrical parts.
Basically, reverse this procedure when assembling them.
However, it is required to remove the common section parts
as far as 1 “Top cover, Bracket” and 2 “Front panel assem­bly” in advance. (See section 1.5.)

1

Mechanism assembly,
P/R MDA board assembly

2 Cassette housing assembly

3 P/R MDA board assembly

4 Mechanism assembly

5 Drum assembly

6 DV Main board assembly

1.7.2 Disassembly/assembly method <DV section>

Step/

Loc No.

1

Mechanism assembly,
P/R MDA
board assembly

2

Cassette housing
assembly

3

P/R MDA
board assembly

4

Mechanism assembly

5

Drum assembly D5 3(S13)

6

DV Main board
assembly

Fig. No.

D1 4(S5),

D2

D3 (S12),(S11),2(S5),

D4 3(S4), 2(L3)

D6 4(S5),

Point NotePart name

CN1502(WR17),
CN5002(WR18),
CN5506(WR19),
CN5501(WR7)

2(S11),2(L1),2(L2),
CN5507(WR20)

CN5502(WR21),
CN5505(WR22),
CN5503(WR23),
CN5504(WR24),
CN5001(WR25),
Earth plate

CN1002(WR14),
CN3701(WR16),
CN1001(WR8),
CN3501(WR15)

<Note 1>

—

—

—

<Note 2>
<Note 3,4>

<Note 1>

With due regard to operational considerations, remove the
parts located on the base (2) (i.e. Mechanism assembly,
P/R MDA board assembly etc.) together before removing
the major parts.

<Note 2>

Take care not to scratch or damage the drum assembly
by the cleaner assembly when performing work.

<Note 3>

Take care not to damage the board assembly when de­taching parts.

<Note 4>

When attaching the FPC, be sure to connect it in the cor­rect orientation.

1

(S5)

WR17

CN1501

(L1)

2

(S5)

(L2)

2

3

(S5)

Base(2)

WR16

(S11)

CN5506

CN5502

Fig. D1

5

Fig. D2

4

(S5)

CN5501

1

<Note 1>

WR7

WR17

6

(S11)

(L2)

WR18

CN5507

1-6

Earth

6

20

(S5)

WR13

CN3501

CN3701

CN1001

CN1002

WR12

<Note 3>

Foil side
<Note 4>

Supporting
tape side
<Note 3>

WR14

WR8

17

(S5)

19

(S5)

18

(S5)

plate

(

7

S12

)

(

S11

9

(S5)

8

)

10

(S5)

CN5505

CN5502

CN5001

5

15

(

S13

3

14

(

)

S13

16

)

(

S13

)

11

(S4)

WR20

WR19

WR23

Fig. D3

12

(S4)

CN5503

WR21

13

(S4)

CN5504

WR22

<Note 2>

Fig. D5

(L3)

Fig. D4

4

Fig. D6

1-7

1.8 SERVICE POSITIONS

The servicing locations for use in troubleshooting or servic­ing of the set are provided separately for the VHS and DV.

I SERVICE POSITIONS <VHS SIDE>

II SERVICE POSITIONS <DV SIDE>

1.8.1 Service position <VHS SIDE>

<Removal>

(1) Remove the top cover and bracket.
(2) Remove the front panel assembly.
(3) Remove the MAIN board assembly together with the

mechanism assembly.

Fig. No.

(Page)

(1)

Top cover,

COM1 9 2 + 1

Bracket (1-3) (No.1-9) (L1,2)

(2) Front

panel

COM2 0 8 2

(1-3) (L3) (CN7507/ —

assembly

(3) Main

board

V2, V3 13 0 5

(1-6) (No.4-16) (CN5321/
assembly
(etc.)

Screw Hook, etc. Connector Note

0 —

CN3011)

CN5322/
CN3014/ —
CN703/
CN2601)

< Installation >

(1) Stand up the bottom chassis assembly so that the DV/

Regulator side is in the lower position.

(2) Connect the PATCH CORD to the three FPCs then con-

nect CN3014, CN7508 and CN7509.

(3) By connecting a total of two FPCs and wires (CN703/

CN2601), carry out the installation so that the Main board
assembly comes in the upper position.

Point: • Take care that the FPCs and wires are not

subjected to stress in this positioning.

(4) Connect the PATCH CORDS to the two FPCs of the front

panel assembly, then connect the CORDS to the
CN7507/CN3011.

For the PATCH CORD is required, see Table 1-8-3.

Table 1-8-1

PATCH CORD

PTU94017B

Main board assembly

CN7507

1

CN7508

6

7

CN2601

D

3

C

4

CN5322

5

CN5321

CN3501

CN7509

CN3011

CN703

CN3014

A

B

2

E

CN3701

1-8

Front panel assembly

Fig. 1-8-1 Service position <VHS side>

CN1002

1.8.2 Service position <DV SIDE>

<Removal>

(1) Remove the top cover and bracket.
(2) Remove the front panel assembly.
(3) Remove the mechanism assembly (DV side) together

with the base (2).

(4) Remove the DV Main board assembly.

Note:

Place an insulation sheet on the mechanism assembly

•

(VHS side), then remove the DV Main board assembly
and place it on the insulation sheet.
When removing the DV Main board assembly, only re­move a connector CN1002 out of four.
Take care not to damage the parts during operating.

(1)

Top cover,

Fig. No.

(Page)

COM1 9 2 + 1 0 —

Screw Hook, etc. Connector Note

Bracket (1-3) (No.1-9) (L1,2)

(2) Front

panel
assembly

(3)

Mechanism D1 4 0 4

COM2 0 8 2

(1-3) (L3) (CN7507/ —

CN3011)

(DV SIDE)/ (1-7) (No.1-4) (CN1502/
BASE (2) CN5002/ —

CN5506/
CN5501)

(4) DV Main

board

D6 4 0 1

(1-8) (No.17-20) (CN1002)

Note

assembly

Table 1-8-2

< Installation >

For the PATCH CORDS, see Table 1-8-3.
The patch cords that are indicated in Table 1-8-3 are in one
package.

(1) Connect a PATCH CORD to the FPC, and connect the

end to the connector CN1002.

(2) Connect PATCH CORDS to the three connectors/FPCs

(CN5506/CN5002/CN1502).

(3) Place the mechanism assembly (DV side) on the origi-

nal position and connect the four wires/FPCs/connectors
(CN5501/CN5506/CN5002/CN1502).

(4) Connect PATCH CORDS to the two FPCs of the FRONT

PANEL ASSEMBLY, and connect the ends to the
CN7507 and CN3011.

Board to Board Wire

A PTU94022-16 QUQ112-1840CG
B PTU94022-18 QUQ112-1640CG
C PTU94022-13 QUQ212-1340CG
D PTU94022-15 QUQ212-1540CG
E YTU94072-06 QUQ210-0640CG
F YTU94074-15 QUQ105-1540AA
G YTU94074-26 QUQ105-2640AA
H YTU94074-20 QUQ105-2040AA

Table 1-8-3

PATCH CORD

PTU94017B

Insulation sheet

CN5002

CN5501

DV mechanism
assembly

BASE (2)

CN3011

Front panel assembly

CN5506

8

2

E

G

7

11

B

H

10

CN1002

CN1501

CN2001

9

F

A

1

DV Main board
assembly

CN7507

7

CN1502

Fig. 1-8-2 Service position <DV side>

SYMBOL CONNECTOR (WIRE) CONNECTIONS

PIN No

PATCH CORD

I / II 1 MAIN CN7507 — JACK CN7002 16 A

I / II 2 MAIN CN3011 — DISPLAY CN7001 18 B

I 3 MAIN CN703 — DV MAIN CN3501 6 —

I 4 MAIN CN7508 — REGULATOR CN5322 13 C

I 5 MAIN CN7509 — REGULATOR CN5321 15 D

I 6 MAIN CN2601 — DV MAIN CN3701 8 —

I / II 7 MAIN CN3014 — DV MAIN CN1002 6 E

II 8 DV MAIN CN1502 — SENSOR 15 F

II 9 P/R MDA CN5002 — DV MAIN CN2001 26 G

II 10 P/R MDA CN5506 — DV MAIN CN1501 20 H

II 11 REGULATOR CN5324 — P/R MDA CN5501 5 —

Table 1-8-4 Connection of Connectors

1-9

1.9 MECHANISM SERVICE MODE

This model has a unique function to enter the mechanism
into every operation mode without loading of any cassette
tape. This function is called the “MECHANISM SERVICE
MODE”.

1.9.1 How to set the "MECHANISM SERVICE MODE"

(1) Disconnect VCR from AC.
(2) Connect TPGND and TP7001 (TEST) on the Display

board assembly with a jump wire.
(3) Connect VCR to AC.
(4) Press the POWER button.

(5) With lock levers A B on the left and right of the Cassette

holder assembly pulled toward the front, slide the holder
in the same direction as the cassette insertion direction.
(For the positions of lock levers A B , refer to the “Pro­cedures for Lowering the Cassette holder assembly” on
page 1-5 of 1.6 HOW TO REMOVE THE MAJOR PARTS
<VHS section>

(6) The cassette holder lowers and, when the loading has

completed, the mechanism enters the desired mode.

Swithing regulator
board assembly

DV Main
board assembly

Fan

board assembly

P/R MDA
board assembly

DV mechanism

Regulator

Main board assembly

TP GND

Terminal board assembly

S-Sub
board assembly

VR701
DV AG C

TP701

On screen

D AGC

board assembly

TP106
PB FM

VHS mechanism

CN3011 CN7507

Supporting
tape side

3D Digital
/2M board
assembly

VR401
D/A
LEVEL ADJ

Demodulator
board
assembly

TP2253
A.PB FM

TP4001
CTL.P

TP111
D.FF

1-10

TP7001
TEST

TPGND

LED SW
board assembly

PATCH COAD
PTU94022-18
QUQ112-1840CG

Display board assembly

<Front panel assembly>

Fig. 1-9-1

Jack board assembly

Jog board
assembly

Eject SW board assembly

PATCH COAD
PTU94022-16
QUQ112-1640CG

1.10 CONNECTION

Treat the wire so as not to come to
DV cassette housing when attaching
the Front panel assembly.

Absorb the looseness
of the 13 ,

14

wires in

the Main part.

Fix the wire by
Style pin surely.

Foil side

Supporting
tape side

Supporting
tape side

Supporting
tape side

Supporting
tape side

Supporting
tape side

Make a
crease.

Make a
crease.

Make a crease.

A

C

CN5325

CN5321 CN5322

CN5301
(Lower)CN5201

CN703

CN7506

CN512

CN7508

CN2601

CN3001

CN2001

CN1

CN1

CON1

CN7509

CN3014

6

3

14

16

17

4

9

5

8

7

12

13

24

11

18

22

20

19

23

15

12

21

10

Foil side

Foil side

Foil side

Foil side

Foil side

Foil side

Foil side

Foil side

Foil side

Foil side

A/C HEAD

DRUM

Treat the wire
according to the
figure not to
overlap in TP.

Make a crease.

Supporting
tape side

B

Should be confirmed that wire
not touch to IC of the Stator
board assembly.

After attach the Mechanism assembly,
treat the wire according to the figure.

The

21 , 22

wires
should be treat under the
P/R MDA board assembly.

CN1502

CN3501

CN1101

CN3701

CN1001

CN5505

CN5503

CN5504

CN5507

CN5506

CN5501

CN5502

CN5001

CN5002

CN2001

CN5323
(Middle)

CN5324
(Upper)

CN3011 CN7507

CN1501

CN1002

CN1

CN3014

CN3011
CN7507

B

DRUM

Main board

assembly

Main board

assembly

Main board

assembly

Chassis

Absorb the looseness of
the wire in the B part.

Treat the front wires
according to the figure.

Treat the wire
through the hole.

DETALE "B"

DETALE "A" DETALE "C"

Base(1)

[CAUTION]

Insert the FPC wires as shown below.

Foil side Supperting tape side side

TOP VIEW

Fig. 1-10-1 Top view

1-11

Fig.
No.

Symbol

Connection

Pin No.

Connected point ←→ Connected point

Type

(FPC/

WIRE)

1 WR1 MAIN CN7507 ←→ JACK CN7002 16 FPC

2 WR2 MAIN CN3011 ←→ DISPLAY CN7001 18 FPC

3 WR3 REGULATOR CN5301 ←→ SW REG CN5201 19 FPC

4 WR4 REGULATOR CN5322 ←→ MAIN CN7508 13 FPC

5 WR5 REGULATOR CN5321 ←→ MAIN CN7509 15 FPC

6 WR6 REGULATOR CN5325 ←→ FAN MOTOR – 2 WIRE

7 WR7 REGULATOR CN5324 ←→ PRE/REC MDA CN5501 5 WIRE

8 WR8 REGULATOR CN5323 ←→ DV MAIN CN1001 10 WIRE

9 WR9 DRUM MOTOR CON1 ←→ MAIN CN3001 5 FPC

10 WR10 MAIN CN1 ←→ UPPER DRUM – 13 FPC

11 WR11 A/C HEAD CN1 ←→ MAIN CN2001 7 FPC

12 WR12 MAIN CN3014 ←→ DV MAIN CN1002 6 FPC

13 WR13 MAIN CN703 ←→ DV MAIN CN3501 6 WIRE

14 WR14 MAIN CN2601 ←→ DV MAIN CN3701 8 FPC

15 WR15 DV MAIN CN1502 ←→ SENSOR – 15 FPC

16 WR16 PRE/REC MDA CN5002 ←→ DV MAIN CN2001 26 FPC

17 WR17 PRE/REC MDA CN5506 ←→ DV MAIN CN1501 20 FPC

18 WR18 PRE/REC MDA CN5507 ←→ DV HOUSING MOTOR – 4 WIRE

19 WR19 PRE/REC MDA CN5502 ←→ DV LOADING MOTOR – 2 WIRE

20 WR20 PRE/REC MDA CN5505 ←→ DV ENCODER – 4 WIRE

21 WR21 PRE/REC MDA CN5503 ←→ DV DRUM MOTOR – 11 FPC

22 WR22 PRE/REC MDA CN5504 ←→ DV CAPSTAN MOTOR – 18 FPC

23 WR23 PRE/REC MDA CN5001 ←→ DV VIDEO HEAD – 10 FPC

24 – MAIN CN7506 ←→ S-SUB CN512 14 FPC

–– DV MAIN CN1101 ←→ Jig CONN. CABLE – 26 –

Table 1-10-1 Connection

1-12

1.11 EMERGENCY DISPLAY FUNCTION

Example 1 E : 01 :

03

Previous emergency

Latest emergency

No emergency record

Example 2 E : –– :

––

This unit has a function for storing the history of the past two
emergencies (EMG) and displaying them on each FDP. With
the status of the VCR and mechanism at the moment an emer­gency occurred can also be confirmed.

FDP display switching
[DV]

FDP display – : –– : –– Normal display

: **Emergency content display

E :

**

E :

**

[VHS]

FDP display

Notes:

•

The emergency detail display
on the latest emergency.
It becomes “ – – : – – : – –” when there is no latest emer­gency record.

•

When using the Jig RCU, set its custom code to match
the custom code of the VCR.

Jig RCU

[Data transmitting method]
Depress the “ ” ( 3 ) button
after the data code is set.

0 : 00 : 00

E: **:

1: *2 : 34

*

5: *6 :

*

CUSTOM CODE
43: A CODE
53: B CODE

DATA CODE

Fig. 1-11-1 Jig RCU [PTU94023B]

(E:Latest:Previous)

: **Emergency content display

(E:Latest:Previous)

Normal display

Emergency content display

**

(E:Latest:Previous)

Emergency detail display

Emergency detail display

7

*

1 2

show the information

INITIAL MODE

1

2

1.11.1 Displaying the emergency information

(1) Transmit the code “59” from the Jig RCU.

The FDP shows the emergency content in the form of

:**”.

“E:

**

Note:

[DV]

For the emergency content, see “1.11.3 Emergency con­tent description”.

[VHS]

For the emergency content, see “1.11.3 Emergency con­tent description”.

(2) Transmit the code “59” from the Jig RCU again.

The FDP shows the emergency detail information 1 in the
form of “

*
*

3 – : Mechanism sensor information at the moment of

– 4 : Mechanism mode position at the moment of emer-

Note:

•

For the emergency detail information
Emergency detail information

(3) Transmit the code “59” from the Jig RCU once again.

The FDP shows the emergency detail information 2 in the
form of “

*
*

*

Note:

•

For the emergency detail information 2 , see “1.11.5 Emer­gency detail information

1 : *2 : 34”.

*

1 : Deck operation mode at the moment of emergency
2 : Mechanism operation mode at the moment of emer-

gency

emergency

gency

1

, see “1.11.4

1

”.

5 : *6 :

*

5 : Type of the cassette tape in use 1 .

7 ”.

*

6 : Winding position of the cassette tape in use

7 : Type of the cassette tape in use 2 (Winding area)

2

”.

(4) Transmit the code “59” from the Jig RCU once again to re-

set the display.

1.11.2 Clearing the emergency history

(1) Display the emergency history.
(2) Transmit the code “36” from the Jig RCU.
(3) Reset the emergency display.

(Y292-03e)

1-13

1.11.3 Emergency content description

Emergency contents “E08/E09” are for the model with Dynamic Drum (DD).

Note:

FDP CONTENT CAUSE

E01: Loading EMG

E02:

Unloading EMG

E03: Take Up Reel

Pulse EMG

E04: Drum FG

EMG

E05: Cassette Eject

EMG

E06: Capstan FG

EMG

E07: SW Power

Short-Circuit
EMG

E08:

DD Initialized
(Absolute
Position
Sensor)
EMG

E09: DD FG EMG

E0A:Supply Reel

Pulse EMG

EC1 or EU1:
Head clog warning

When the mechanism mode cannot be changed to an­other mode even when the loading motor has rotated
for more than 4 seconds in the loading direction, [E:01]
is identified and the power is turned off.

When the mechanism mode cannot be changed to an­other mode even when the loading motor has rotated
for more than 4 seconds in the unloading direction, [E:02]
is identified and the power is turned off.

When the take-up reel pulse has not been generated for
more than 4 seconds in the capstan rotating mode, [E:03]
is identified, the pinch rollers are turned off and stopped,
and the power is turned off. However, the reel EMG is
not detected in STILL/SLOW modes.

When the drum FG pulse has not been input for more
than 3 seconds in the drum rotating mode, [E:04] is iden­tified, the pinch rollers are turned off and stopped, and
the power is turned off.

When the eject operation does not complete in 3 sec­onds after the start, [E:05] is identified, the pinch rollers
are turned off and stopped, and the power is turned off.
When the cassette insertion operation does not complete
in 3 seconds after the start, the cassette is ejected. In
addition, when the operation does not complete within
3 seconds after the start, [E:05] is also identified and the
power is turned off immediately.

When the capstan FG pulse has not been generated for
more than 1 second in the capstan rotating mode, [E:06]
is identified, the pinch rollers are turned off and stopped,
and the power is turned off.However, the capstan EMG
is not detected in STILL/SLOW/FF/REW modes.

When short-circuiting of the SW power supply with GND
has lasted for 0.5 second or more, [E:07] is identified,
all the motors are stopped and the power is turned off.

When DD tilting does not complete in 4 seconds, [E:08]
is identified, the tilt motor is stopped and the power is
turned off.

When the DD FG pulse is not generated within 2.5 sec­onds, [E:09] is identified, the tilt motor is stopped and
the power is turned off.

When the supply reel pulse has not been generated for
more than 10 seconds in the capstan rotating mode,
[E:0A] is identified and the cassette is ejected (but the
power is not turned off). However, note that the reel EMG
is not detected in the SLOW/STILL mode.

Presupposing the presence of the control pulse output in the PLAY mode, when the value obtained by mixing the two V.FM output
channels (without regard to the A.FM output) has remained below a certain threshold level for more than 10 seconds, [E:C1] or [E:U1]
is identified and recorded in the emergency history. During the period in which a head clog is detected, the FDP and OSD repeat the
“3-second warning display” and “7-second noise picture display” alternately.

EMG code : “E:C1” or “E:U1” / FDP : “U:01” / OSD : “Try cleaning tape.” or “Use cleaning cassette.”
The head clog warning is reset when the above-mentioned threshold has been exceeded for more than 2 seconds or the mode is
changed to another mode than PLAY.

The mechanism is locked in the middle of mode transition.

1
2

The mechanism is locked at the loading end due to the encoder position
reading error during mode transition.

3

Power is not supplied to the loading MDA.

1

The mechanism is locked in the middle of mode transition.

2

The mechanism is locked at the unloading end due to the encoder posi­tion reading error during mode transition.

3

Power is not supplied to the loading MDA.

1

The take-up reel pulse is not generated in the FWD transport modes (PLAY/
FWD SEARCH/FF, etc.) because;

1) The idler gear is not meshed with the take-up reel gear;
The idler gear is meshed with the take-up reel gear, but incapable of wind-

2)

ing due to too large mechanical load (abnormal tension);

3) The take-up reel sensor does not output the FG pulse.

2

The supply reel pulse is not generated in the REV transport modes (REV
SEARCH/REW, etc.) because;

1) The idler gear is not meshed with the supply reel gear.

2) The idler gear is meshed with the supply reel gear, but incapable of wind­ing due to too large a mechanical load (abnormal tension);

3) The supply reel sensor does not output the FG pulse.

3

Power is not supplied to the reel sensors.

1

The drum could not start or the drum rotation has stopped due to too large
a load on the tape, because;

1) The tape tension is abnormally high;
The tape is damaged or a foreign object (grease, etc.) adheres to the tape.

2)

2

The drum FG pulse did not reach the System controller CPU because;

1) The signal circuit is disconnected in the middle;

2) The FG pulse generator (hall device) of the drum is faulty.

3

The drum control voltage (DRUM CTL V) is not supplied to the MDA.

4

Power is not supplied to the drum MDA.

1

The cassette cannot be ejected due to a failure in the drive mechanism of
the housing.

2

When the housing load increases during ejection, the loading motor is
stopped because of lack of headroom in its drive torque.

Housing load increasing factors: Temperature environment (low tempera­ture, etc.), mechanism wear or failure.

3

The sensor/switch for detecting the end of ejection are not functioning normally.

4

The loading motor drive voltage is lower than specified or power is not sup­plied to the motor (MDA).

5

When the user attempted to eject a cassette, a foreign object (or perhaps
the user's hand) was caught in the opening of the housing.

1

The capstan could not start or the capstan rotation has stopped due to too
large a load on the tape, because;

1) The tape tension is abnormally high (mechanical lock);

2) The tape is damaged or a foreign object (grease, etc.) is adhered to the

tape (occurrence of tape entangling, etc.).

2

The capstan FG pulse did not reach the System controller CPU because;

1) The signal circuit is disconnected in the middle;

2) The FG pulse generator (MR device) of the capstans is faulty.

3

The capstan control voltage (CAPSTAN CTL V) is not supplied to the MDA.

4

Power is not supplied to the capstan MDA.

1

The SW 5 V power supply circuit is shorted with GND.

2

The SW 12 V power supply circuit is shorted with GND.

1 The absolute value sensor is defective. (The soldered parts have separated.)
2 The pull-up resistor at the absolute sensor output is defective. (The soldered parts

have separated.)

3 Contact failure or soldering failure of the pins of the connector (board-to-board) to the

absolute value sensor.
The absolute value sensor data is not sent to the System Controller CPU.

4

1 The FG sensor is defective. (The soldered parts have separated.)
2 The pull-up resistor at the FG sensor output is defective. (The soldered parts have

separated.)
3 Contact failure or soldering failure of the pins of the connector (board-to-board) to the FG sensor.
4 The power to the sensor is not supplied. (Connection failure/soldering failure)
5 The FG pulse is not sent to the System Controller CPU.

The tilt motor is defective. (The soldered parts have separated.)

6
7 The drive power to the tilt motor is not supplied. (Connection failure/soldering failure)
8 The tilt motor drive MDA - IC is defective.
9 Auto-recovery of the DD tilting cannot take place due to overrun.

The supply reel pulse is not generated in the FWD transport mode (PLAY/

1

FWD SEARCH/FF, etc.) because;

1) PLAY/FWD or SEARCH/FF is started while the tape in the inserted cas­sette is cut in the middle;

2) A mechanical factor caused tape slack inside and outside the supply
reel side of the cassette shell. In this case, the supply reel will not rotate
until the tape slack is removed by the FWD transport, so the pulse is not
generated until then;

3) The FG pulse output from the supply reel sensor is absent.

2

The take-up reel pulse is not generated in the REV transport mode (REV
SEARCH/REW, etc.).

1) REV SEARCH/REW is started when the tape in the inserted cassette
has been cut in the middle;

2) A mechanical factor caused tape slack inside and outside the take-up
reel side of the cassette shell. In this case, the supply reel will not rotate
until the tape slack is removed by the REV transport, so the pulse will
not be generated until that time;

3) The FG pulse output from the take-up reel sensor is absent.

3

The power to a reel sensor is not supplied.

1-14

Table 1-11-1

1.11.4 Emergency detail information 1

The status (electrical operation mode) of the VCR and the sta­tus (mechanism operation mode/sensor information) of the
mechanism in the latest emergency can be confirmed based on
the figure in EMG detail information 1 .

[FDP display]

1 : *2 : 34

*

1 : Deck operation mode at the moment of emergency

*

2 :

Mechanism operation mode at the moment of emergency

*

3 –

: Mechanism sensor information at the moment of emergency

– 4 :

Mechanism mode position at the moment of emergency

Note:

•

In the Deck operation mode/Mechanism operation mode/
Mechanism mode position, the contents of the code that
is shown on the FDP differs depending on the parts
number of the System Control microprocessor (IC3001)
of the VCR.
For the microprocessor parts number that starts with the
two letters “MN”, refer to the Table of MN and for parts
number with “HD”, refer to the Table of HD.

2 : Mechanism Operation Mode

*

[Table of MN]

Display

00 Command standby (Status without executing command)
02 POWER OFF by EMG occurrence
04 Moving to the adjacent position in the LOAD direction
06 Moving to the adjacent position in the UNLOAD direction
08 Cassette ejection being executed
0A Cassette insertion being executed
0C Tape being loaded
0E Tape being unloaded
10 Mode transition to STOP with pinch roller compression ON
12 Mode transition to STOP with pinch roller compression OFF
14 Mode transition to STOP with pinch roller compression OFF as a result

of POWER OFF

16 Mode transition to STOP with pinch roller compression ON as a result of

POWER ON
18 Mode transition to PLAY
1A Mode transition to FWD SEARCH
1C Mode transition to REC
1E Mode transition to FWD STILL/SLOW
20 Mode transition to REV STILL/SLOW
22 Mode transition to REV SEARCH
24 Mode transition from FF/REW to STOP
26 Mode transition to FF
28 Mode transition to REW
2A 4 sec. of REV as a result of END sensor going ON during loading
2C Short FF/REV as a result of tape sensor going ON during unloading
2E Mechanism position being corrected due to overrun
80 Mechanism in initial position (Dummy command)

Mechanism Operation Mode

1 : Deck Operation Mode

*

[Table of MN]

Display

00 Mechanism being initialized
01 STOP with pinch roller pressure off (or tape present with P.OFF)
02 STOP with pinch roller pressure on
03 POWER OFF as a result of EMG
04 PLAY
0C REC
10 Cassette ejected
20 FF
21 Tape fully loaded, START sensor ON, short FF
22

Cassette identification FWD SEARCH before transition to FF (SP x7-speed)
24 FWD SEARCH (variable speed) including x2-speed
2C INSERT REC
40 REW
42

Cassette identification REV SEARCH before transition to REW (SP x7-speed)
44 REV SEARCH (variable speed)
4C AUDIO DUB
6C INSERT REC (VIDEO + AUDIO)
84 FWD STILL/SLOW
85 REV STILL/SLOW
8C REC PAUSE
8D Back spacing
8E Forward spacing (FWD transport mode with BEST function)
AC INSERT REC PAUSE
AD INSERT REC Back spacing
CC AUDIO DUB PAUSE
CD AUDIO DUB Back spacing
EC INSERT REC (VIDEO + AUDIO) PAUSE
ED INSERT REC (VIDEO + AUDIO) Back spacing

Deck Operation Mode

[Table of HD]

Display

00 STOP with pinch roller pressure off (or tape present with P.OFF)
01 STOP with pinch roller pressure on
04 PLAY
0E REC
11 Cassette ejected
22 FF
26 FWD SEARCH (variable speed) including x2-speed
2E INSERT REC
43 REW
47 REV SEARCH (variable speed)
4C AUDIO DUB
6E INSERT REC (VIDEO+AUDIO)
84 FWD STILL/SLOW
85 REV STILL/SLOW
8F REC PAUSE
AF INSERT REC PAUSE
CD AUDIO DUB PAUSE
EF INSERT REC (VIDEO+AUDIO) PAUSE

Deck Operation Mode

[Table of HD]

Display

00 STOP with pinch roller pressure off
01 STOP with pinch roller pressure on
02 U/L STOP (or tape being loaded)
04 PLAY
05 PLAY (x1-speed playback using JOG)
0E REC
11 Cassette ejected
22 FF
26 FWD SEARCH (variable speed) including x2-speed
2E INSERT REC
43 REW
47 REV SEARCH
4C AUDIO DUB
6E INSERT REC (VIDEO + AUDIO)
84 FWD STILL/SLOW
85 REV STILL/SLOW
8F REC PAUSE
AF INSERT REC PAUSE
C7 REV SEARCH (x1-speed reverse playback using JOG)
CD AUDIO DUB PAUSE
EF INSERT REC (VIDEO + AUDIO) PAUSE
F0 Mechanism being initialized
F1 POWER OFF as a result of EMG
F2 Cassette being inserted
F3 Cassette being ejected
F4 Transition from STOP with pinch roller pressure on to STOP with pinch

roller pressure off
F5 Transition from STOP with pinch roller pressure on to PLAY
F6 Transition from STOP with pinch roller pressure on to REC
F7 Cassette type detection SEARCH before FF/REW is being executed
F8 Tape being unloaded
F9 Transition from STOP with pinch roller pressure off to STOP with pinch

roller pressure on
FA Transition from STOP with pinch roller pressure off to FF/REW
FB Transition from STOP with pinch roller pressure off to REC.P (T.REC,etc.)
FC Transition from STOP with pinch roller pressure off to cassette type de-

tection SEARCH
FD Short REV being executed after END sensor on during unloading
FE Tension loosening being executed after tape loading (STOP with pinch

roller pressure on)

Mechanism Operation Mode

1-15

3 – : Mechanism Sensor Information

[Common table of MN and HD]

Display

0– VHS Tab broken ON ON
1– VHS Tab broken ON OFF
2– VHS Tab broken OFF ON
3– VHS Tab broken OFF OFF
4– VHS Tab present ON ON
5– VHS Tab present ON OFF
6– VHS Tab present OFF ON
7– VHS Tab present OFF OFF
8– S-VHS Tab broken ON ON
9– S-VHS Tab broken ON OFF
A– S-VHS Tab broken OFF ON
B– S-VHS Tab broken OFF OFF
C– S-VHS Tab present ON ON
D– S-VHS Tab present ON OFF
E– S-VHS Tab present OFF ON
F– S-VHS Tab present OFF OFF

– 4 : Mechanism Mode Position

Mechanism Sensor Information

S-VHS SW

REC SAFETY SW

START SENSOR

END SENSOR

[Table of MN]

Display

-0 Initial value

-1 EJECT position

-2 Housing operating

-3 U/L STOP position

-4

Tape being loaded/unloaded (When the pole base is located on the front
side of the position just beside the drum)

-5 Tape being loaded/unloaded (When the pole base is located on the rear
side of the position just beside the drum)

-6 Pole base compressed position

-7 FF/REW position

-8 Between FF/REW and STOP with pinch roller compression ON

-9 STOP with pinch roller compression OFF

-A Between STOP with pinch roller compression OFF and REV

-B REV (REV STILL/SLOW) position

-C Between REV and FWD

-D FWD (FWD STILL/SLOW) position

-E Between FWD and PLAY

-F PLAY position

Mechanism Mode Position

[Table of HD]

Display

–0 EJECT position
–1 U/L STOP position
–2 Tape being loaded/unloaded (When the pole base is located on the rear

side of the position just beside the drum)

–3 FF/REW position
–4 STOP with pinch roller pressure off
–5 REV (REV STILL/SLOW) position
–6 FWD (FWD STILL/SLOW) position, PLAY position
–7 Intermediate position during transition between other mechanism modes

Mechanism Mode Position

Note:

•

As the display is always “–7” at any intermediate position
between mechanism modes, the position of transitory
EMG may sometimes not be locatable.

1-16

1.11.5 Emergency detail information 2

The type of the cassette tape and the cassette tape winding po­sition can be confirmed based on the figure in EMG detail infor­mation 2 .

[FDP display]

5 : *6 :

*

*
*

*

Note:

•

EMG detail information 2 is the reference information

7

*

5 : Type of the cassette tape in use 1
6 : Winding position of the cassette tape in use

7 :

Type of the cassette tape in use

2

(Winding area)

stored using the remaining tape detection function of the
cassette tape. As a result, it may not identify cassette cor­rectly when a special cassette tape is used or when the
tape has variable thickness.

5 : Cassette tape type 1

*

Display Cassette Tape Type 1

00 Cassette type not identified
16

Large reel/small reel (T-0 to T-15/T-130 to T-210) not classified
82 Small reel, thick tape (T-120) identified/thin tape (T-140) identified
84 Large reel (T-0 to T-60) identified
92

Small reel, thick tape (T-130) identified/thin tape (T-160 to T-210) identified
93

Small reel, thick tape/C cassette (T-0 to T-100/C cassette) not classified
C3

Small reel, thick tape/C cassette (T-0 to T-100/C cassette) being classified
D3

Small reel, thick tape/C cassette (T-0 to T-100/C cassette) being classified
E1 C cassette, thick tape (TC-10 to TC-20) identified
E2 Small reel, thick tape (T-0 to T-100) identified
E9 C cassette, thin tape (TC-30 to TC-40) identified
F1

C cassette, thick tape/thin tape (TC-10 to TC-40) not classified

Notes:

•

Cassette tape type 1 is identified a few times during mode
transition and the identification count is variable depending on
the cassette tape type. If an EMG occurs in the middle of identi­fication, the cassette tape type may not be able to be identified.

•

If other value than those listed in the above table is displayed,
the cassette tape type is not identified.

6 : Cassette tape winding position

*

The cassette tape winding position at the moment of EMG is
displayed by dividing the entire tape (from the beginning to the
end) in 22 sections using a hex number from “00” to “15”.

“00” : End of winding
“15” : Beginning of winding
“FF” : Tape position not identified

7 : Cassette tape type 2 (Winding area)

*

Display Cassette Tape Type 2

00

Cassette type not identified

07

Small reel, thick tape T-5

08 - 0E

C cassette, thick tape TC-10

09 - 15

0A - 16
0A - 16

11 - 14
15 - 18
17 - 1A

1F - 23
21 - 23
21 - 23
22 - 24
22 - 24
22 - 24
22 - 23
23 - 24
25 - 26
27 - 29
29 - 2B

C cassette, thick tape TC-20P
Small reel, thick tape T-20
C cassette, thin tape TC-30
C cassette, thin tape TC-40
Small reel, thick tape T-40
Small reel, thick tape T-60
Small reel, thick tape T-80/DF-160
Small reel, thick tape T-80/DF-180
Small reel, thick tape T-100
Small reel, thick tape T-120/DF-240
Small reel, thin tape T-140
Small reel, thick tape T-130
Small reel, thin tape T-160
Small reel, thin tape T-168
Small reel, thick tape DF-300
Small reel, thin tape T-180/DF-380
Small reel, thin tape T-210/DF-420
Large reel T-5
Large reel T-10
Large reel T-20
Large reel T-30
Large reel T-40
Large reel T-60

0A - 0B

0D - 0F

19 - 1D
1D - 21
1E - 1F

2D - 2F

Note:

•

The values of cassette tape type 2 in the above table are
typical values with representative cassette tapes.

SECTION 2

MECHANISM ADJUSTMENT (VHS)

2.1 BEFORE STARTING REPAIR AND ADJUSTMENT

2.1.1 Precautions

(1) Unplug the power cable of the main unit before using your

soldering iron.

(2) Take care not to cause any damage to the conductor

wires when plugging and unplugging the connectors.

(3) Do not randomly handle the parts without identifying

where the trouble is.

(4) Exercise enough care not to damage the lugs, etc. dur-

ing the repair work.

(5) When installing the front panel assembly, be sure to hook

the lug on the back side of the cassette door to the door
opener of the cassette holder. If this operation is ne­glected it will not be possible to remove the cassette when
ejecting because the housing door cannot be opened.

2.1.2 Checking for Proper Mechanical Operations

Enter the mechanism service mode when you want to oper­ate the mechanism when no cassette is loaded. (See 1.5
MECHANISM SERVICE MODE.)

Loading motor

Pole base assembly

2.1.3 Manually Removing the Cassette Tape

1. In case of electrical failures

If you cannot remove the cassette tape which is loaded be­cause of any electrical failure, manually remove it by taking
the following steps.

(1) Unplug the power cable and remove the top cover,

bracket and front panel assembly. (See 1.3 DISASSEM­BLY/ASSEMBLY METHOD.)

(2) Unload the cassette by manually turning the loading mo-

tor of the mechanism assembly toward the front. In do­ing so, hold the tape by the hand to keep the slack away
from any grease. (See Fig.2-1-3a.)

(3) Bring the pole base assembly (supply or take-up side) to

a pause when it reaches the position where it is hidden
behind the cassette tape.

(4) Move the top guide toward the drum while holding down

the lug A of the bracket retaining the top guide. Like­wise hold part B down and remove the top guide.
Section C of the top guide is then brought under the
cassette lid. Then remove the top guide by pressing the
whole cassette tape down. (See Fig.2-1-3b.)

(5) Remove the cassette tape by holding both the slackened

tape and the cassette lid.

(6) Take up the slack of the tape into the cassette. This com-

pletes removal of the cassette tape.

Fig. 2-1-3a

C

A

B

Press

Fig. 2-1-3b

2-1

2. In case of mechanical failure

If you cannot remove the cassette tape which is loaded be­cause of any mechanical failure, manually remove it by tak­ing the following steps.

(1) Unplug the power cable and remove the top cover, front

panel assembly and others so that the mechanism as­sembly is visible. (See 1.3 DISASSEMBLY/ASSEMBLY
METHOD.)

(2) While keeping the tension arm assembly of the mecha-

nism assembly free from tension, pull the tape on the pole
base assembly (supply or take-up side) out of the guide
roller. (See Fig.2-1-3c.)

(3) Take the spring of the pinch roller arm assembly off the

hook of the press lever assembly, and detach it from the
tape. (See Fig.2-1-3d.)

(4) In the same way as in the electrical failure instructions in

2.1.3-1(4), remove the top guide.

(5) Raise the cassette tape cover. By keeping it in that posi-

tion, draw out the cassette tape case from the cassette
holder and take out the tape.

(6) By hanging the pinch roller arm assembly spring back

on the hook, take up the slack of the tape into the cas­sette.

Pole base assembly (take-up side)

2.1.4 Jigs and Tools Required for Adjustment

Roller driver

PTU94002

Back tension cassette gauge

PUJ48076-2

Alignment tape

(SP, stairstep, PAL)

MHPE

A/C head positioning tool

PTU94010

Jig RCU

PTU94023B

Alignment tape

(LP, stairstep, PAL)

MHPE-L

Torque gauge

PUJ48075-2

Pole base assembly

(supply side)

Tension arm assembly

Fig. 2-1-3c

Take the spring
off the hook, and
detach it from the
tape.

Guide pole guard

2-2

Pinch roller arm assembly

Press lever assembly

Fig. 2-1-3d

2.1.5 Maintenance and Inspection

1. Location of major mechanical parts

In this chapter, the two mechanism speeds are described by comparing the speeds of the standard type and the high-speed
FF/REW type.
It is possible to distinguish between these two types of mechanism by the diameters of their capstan pulleys.
The capstan pulley diameter for the standard type is approx. 32 mm.
The capstan pulley diameter for the high-speed FF/REW type is approx. 43 mm.
For information on the different parts used in the two mechanism types, please refer to the “Replacement of major parts”.

UV catcher2 (supply and take-up side)

Stator assembly

T2

Full erase head

T26

Pole base assembly

T25

(supply side)

Tension arm

T24

assembly

Adjust pin

T23

Tension brake

T22

assembly

T1

T3

Drum assembly

T5 T7

T6

Head base

Audio control head

Loading motor

Guide pole guard

T8

Pinch roller arm

T9

assembly

Lid guide

T10

Press lever

T11

assembly

Guide arm

T12

assembly

Reel disk

T13

(take-up side)

Sub brake assembly

T14

(take-up side)

Belt

B22

(loading motor)

B21

Control cam

B20

B19

Cassette gear

B18

Worm gear

Brake lever

Rec safety lever

B1

Reel disk

T20

(supply side)

Main brake assembly
(supply side)

Idler lever

T17T19T21

Idler arm assembly

T16T18

Pole base assembly (take-up side)

Fig. 2-1-5a Mechanism assembly top side

Capstan motor

Belt (capstan)

B2

Capstan brake assembly

B3 B5

Loading arm gear (take-up side)

B4

Loading arm gear (supply side)

Main brake assembly

T15

(take-up side)

Plate

B6

(supply side)

Control

B7

bracket1

Control plate

B8

Tension arm

B9

bearing

Link lever

B17

Rotary encoder guide

B16

Rotary encoder

B15

B14

Direct gear

B13

Change lever assembly

B12

B10

Clutch unit

Take-up head

Fig. 2-1-5b Mechanism assembly bottom side

Take-up lever

B11

2-3

Guide rail Roller cam assembly

L2L1

Fig. 2-1-5c Mechanism assembly left side

R1

Opener guide

Door

R2

opener

Drive gear

R3

Cassette housing bracket

R4

R5

Limit gear

Loading motor

Worm gear

Belt (loading motor)

Fig. 2-1-5d Mechanism assembly right side

2. Cleaning

Regular cleaning of the transport system parts is desirable
but practically impossible. So make it a rule to carry out clean­ing of the tape transport system whenever the machine is
serviced.
When the video head, tape guide and/or brush get soiled,
the playback picture may appear inferior or at worst disap­pear, resulting in possible tape damage.

(1) When cleaning the upper drum (especially the video

head), soak a piece of closely woven cloth or Kimu-wipe
with alcohol and while holding the cloth onto the upper
drum by the fingers, turn the upper drum
counterclockwise.

Note:

• Absolutely avoid sweeping the upper drum vertically
as this will cause damage to the video head.

(2) To clean the parts of the tape transport system other than

the upper drum, use a piece of closely woven cloth or a
cotton swab soaked with alcohol.

(3) After cleaning, make sure that the cleaned parts are com-

pletely dry before using the video tape.

3. Lubrication

With no need for periodical lubrication, you have only to lu­bricate new parts after replacement. If any oil or grease on
contact parts is soiled, wipe it off and newly lubricate the
parts.

Note:

• See the “mechanism assembly” diagram of the parts
list for the lubricating or greasing spots, and for the
types of oil or grease to be used.

4. Suggested servicing schedule for main components

The following table indicates the suggested period for such
service measures as cleaning,lubrication and replacement.
In practice, the indicated periods will vary widely according
to environmental and usage conditions.However, the indi­cated components should be inspected when a set is brought
for service and the maintenance work performed if neces­sary. Also note that rubber parts may deform in time,even if
the set is not used.

System Parts Name

Upper drum assembly

A/C head

Lower drum assembly

Pinch roller arm assembly

Full erase head

Tension arm assembly

Capstan motor (Shaft)

Guide arm assembly

Capstan motor

Capstan brake assembly

Main brake assembly

Belt (Capstan)

Belt (Loading motor)

Loading motor

Clutch unit

Worm gear

Control plate

Brush

Tension brake assembly

Other Drive Tape transport

Rotary encoder

: Cleaning

¤

: Inspection or Replacement if necessary

R

Operation Hours

~1000H ~2000H

¤R R
¤R ¤R

¤¤R
¤¤
¤¤
¤¤
¤¤
¤¤

R
R
R

RR

R
R
R
R
R

¤R ¤R

RR

R

Table 2-1-5a

5. Disassembling procedure table

The following table indicates the order in which parts are re­moved for replacement. To replace parts, remove them in
the order of 1 to 18 as shown in the table. To install them,
reverse the removal sequence.
The symbols and numbers preceding the individual part
names represent the numbers in the “Location of major me­chanical parts” table. Also, the “T”, “B”, and “T/B” on the right
of each part name shows that the particular part is removed
from the front, from the back, and from both sides of the
mechanism, respectively.

2-4

R4 R1 R3 T9 T12 T11 B15 B12 B14 B13 B17 B21 B7 B8 B5 B4 B11 T14 T15 T13 T22 T24 T18 B19

Symbols and numbers

Removal parts

(Reference items)
Replacement parts

Symbols and numbers

2.2.3 Guide rail T 1

L2

2.2.3 Roller cam assembly T 1

R4

2.2.3 Cassette housing bracket T 1

R1

2.2.3 Opener guide T 2

R2

2.2.3 Door opener T 3

2.2.3 Relay gear T 3

R5

2.2.3 Limit gear T 3

2.2.3 Cassette holder assembly T 6

R3

2.2.3 Drive gear T 4

2.2.3 Drive arm T 8

T9

2.2.4 Pinch roller arm assembly T 1

T12

2.2.5 Guide arm assembly T 1

T11

2.2.5 Press lever assembly T 3

T6

2.2.6 Audio control head T 1

T7

2.2.7 Loading motor T 1

B1

2.2.8 Capstan motor T/B 1

T1

2.2.9 UV catcher2 T 1

T17

2.2.9

Pole base assembly (take-up side)

T25

2.2.9

Pole base assembly (supply side)

B15

2.2.10 Rotary encoder B 1

B12

2.2.11 Clutch unit B 1

B14

2.2.12 Change lever assembly B 3

B13

2.2.12 Direct gear B 4

2.2.12 Clutch gear B 5

2.2.12 Coupling gear (

B17

2.2.13 Link lever B 1

B18

2.2.14 Cassette gear B 2

B20

2.2.14 Control cam B 2

B21

2.2.14 Worm gear B 1

T10

- Lid guide T/B 5

B7

2.2.15 Control bracket1 B 1

B8

2.2.15 Control plate B 6

B5

2.2.16 Loading arm gear (supply side) B 7

B4

2.2.16

Loading arm gear (take-up side)

2.2.16 Loading arm gear shaft B 9

2.2.17 Take-up lever T/B 7

B11

B10

2.2.17 Take-up head T/B 8

2.2.17 Control plate guide T/B 8

B3

2.2.18 Capstan brake assembly T/B 7

T14

2.2.19

Sub brake assembly(take-up side)

T15

2.2.20

Main brake assembly(take-up side)

T19

2.2.20

Main brake assembly(supply side)

T13

2.2.20 Reel disk (take-up side) T/B 16

T22

2.2.21 Tension brake assembly T/B 9

T20

2.2.21 Reel disk (supply side) T/B 10

T24

2.2.21 Tension arm assembly T/B 10

B9

2.2.21 Tension arm bearing T/B 10

T18

2.2.22 Idler lever T/B 17

T16

2.2.22 Idler arm assembly T/B 18

B19

- Brake lever (

B16

- Rotary encoder guide T/B 19

2) B 6

*

1

) T/B 18

*

L1L1L2

Number of removal steps

Guide rail

Roller cam assembly

Cassette housing bracket

Opener guide

112
12

12

12 3

3

4 5

5 6

Relay gear

6 7

Front (T)/Back (B) of mechanism

1 2 3 4 5

12

T/B 2

T/B 2

B8

T/B 15

1 2 3 4

T/B 16

1 2 3 4 5 6 7 8

T/B 9

1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8

Cassette holder assembly

Drive gear

8

7

Table 2-1-5b

Note:

• The parts with marked (
nisms (standard type or high-speed FF/REW type).

1 : Uses the standard type mechanism only.

*

2 : Uses the high-speed FF/REW type mechanism only.

*

) have different types of mecha-

*

T1

Drive arm

Pinch roller arm assembly

Guide arm assembly

Press lever assembly

UV catcher2

Rotary encoder

1

2

1

1

1
12

12
1 2 3 4 5

12

3 4

1 2 3 4

1 2 3 4 5

1 2 3 4 5 6
1 2 3 4 5 6 7
1 2 3 4 5 6

1 2 3 4 5 6
1 2 3 4 5 6
1 2 3 4 5 6

9 10 11 12 13 14

9 10 11 12 13 14 15

9 10 11 12 13 14 15

9 10 11 12 13 14 15 16

9 10 11 12 13 14 15 16 17
9 10 11 12 13 14 15 16 17

9 10 11 12 13 14 15 16 17 18

Clutch unit

Change lever assembly

Direct gear

Clutch gear

Link lever

2

3

3

4

1

1

Worm gear

Control bracket1

Control plate

5

6

7

Loading arm gear (supply side)

Loading arm gear (take-up side)

Take-up lever

Sub brake assembly (take-up side)

Main brake assembly (take-up side)

Reel disk (take-up side)

Tension brake assembly

Tension arm assembly

8

7
7

9

9

9

)
1

*

(

Idler lever

Brake lever

2-5

g

2.2 REPLACEMENT OF MAJOR PARTS

2.2.1 Before Starting Disassembling (Phase matching
between mechanical parts)

The mechanism of this unit is closely linked with the rotary
encoder and system controller circuits.
Since the system controller detects the status of mechani­cal operation in response to phases of the rotary encoder
(internal switch positions), the mechanism may not operate
properly unless such parts as the rotary encoder, control
plate, loading arm gear, control cam, cassette gear, limit gear,
relay gear and drive gear are installed in their correct posi­tions.
Especially, this model is not provided with any cassette hous­ing assembly, so that cassette loading and unloading must
be accomplished by operation of the cassette holder assem­bly. The latter is in turn driven by such parts as the drive
gear, relay gear and limit gear. Exercise enough care, there­fore, to have the phases of all this gear matching one an­other. (For information on phase matching of the mechanism,
see the instructions on how to install individual parts.)
This unit is provided with a mechanism assembly mode. It is
therefore necessary to enter this mode for assembling and
disassembling procedures.
This mode is usually not in use, manually set it when it is
required.

2.2.3 Cassette Holder Assembly

1. How to remove

(1) Remove the guide rail and roller cam assembly. (See

Fig.2-2-3a.)
(3 lugs on the guide rail and one lug on the roller cam
assembly)

Guide rail

Lugs

Roller cam
assembly

Lug

Lug

Fig. 2-2-3a

(2) Remove the two slit washers and remove the cassette

housing bracket. (See Fig.2-2-3b.)

(3) Remove the opener guide, spring(A), door opener, relay

gear and limit gear. (See Fig.2-2-3b.)

2.2.2 How to Set the Mechanism Assembling Mode

Remove the mechanism assembly and place it bottom side
up. (See SECTION 1 DISASSEMBLY.) Turn the worm gear
toward the front so that the guide hole of the control cam is
brought into alignment with the hole at the mechanism as­sembly chassis. This position renders the mechanism assem­bling mode operational. Make sure that the control plate is
located in alignment with the mark E. (See Fig.2-2-2a.)

Worm gear

Chassis hole

Guide hole

Control cam

Limit gear

Spring(A)

Opener guide

Relay gear

Door opener

Cassette housing bracket

Slit washers

Fig. 2-2-3b

(4) While swinging the lock levers (R) and (L) of the cassette

holder assembly toward the front, slide the cassette
holder assembly until its legs come to where the guide
rail and the roller cam assembly have been removed (so
that the drive arm is upright). (See Fig.2-2-3c.)

Lock lever (L)

Cassette holder assembly

Drive arm

(Upright)

2-6

Control plate

Fig. 2-2-2a

Mark E

Le

Fig. 2-2-3c

Legs

While holding the left side of the cassette holder, lift the

A

B

C

Cassette holder assembly

Drive arm

Lock lever (R)

Cassette holder assembly

(5)

cassette holder assembly so that the three legs on the
left side are all released. Then pull the legs A and B
on the right side out of the rail and also pull up the leg C .
(See Fig.2-2-3d and Fig.2-2-3e.)

(6) Draw out the drive gear, and remove the drive arm.

Cassette holder assembly

Fig. 2-2-3d

Cassette holder assembly

A

2. How to install (Phase matching)

A

(1) Insert the section

of the drive arm into the section B

of the main deck.

(2) Insert the section 1 of the drive gear into the round hole,

and the section 2 into the square hole on the drive arm.
(See Fig.2-2-3f.)

(3) Hold the drive arm upright and fit the leg C on the right

side of the cassette holder assembly into the groove. (See
Fig.2-2-3g.)

(4) While swinging the lock lever (R) of the cassette holder

assembly toward the front, put the legs A and B into
the rail. (See Fig.2-2-3g.)

(5) Drop the three legs on the left side of the cassette holder

assembly into the groove at one time. (See Fig.2-2-3h.)

(6) Slide the whole cassette holder assembly toward the front

to bring it to the eject end position.

(7) Install the limit gear so that the notch on the outer cir-

cumference of the limit gear is brought into alignment with
the guide hole on the main deck. (See Fig.2-2-3i.)

(8) Install so that the notch on the periphery of the relay gear

is aligned with the notch of the main deck and that hole
A of the relay gear is aligned with the hole A of the limit
gear and that hole B of the relay gear is aligned with the
hole B of the drive gear. (See Fig.2-2-3i.)

(9) Install the door opener, opener guide, spring(A) and cas-

sette housing bracket and fasten the two slit washers.

Fig. 2-2-3e

Main deck right side

Drive arm

Hole

B

C

Drive arm

Fig. 2-2-3g

Hole

Drive gear

1

2

A

B

Fig. 2-2-3h

Fig. 2-2-3f

2-7

Relay gear

B

Guide holeNotches Notch

2.2.6 Audio Control Head

1. How to remove

(1) Remove the two screws (A) and remove the audio con-

trol head together with the head base.

(2) When replacing only the audio control head, remove the

three screws (B) while controlling the compression spring.

Head base

B

AA

Drive gear Limit gear

Fig. 2-2-3i

2.2.4 Pinch Roller Arm Assembly

1. How to remove

(1) Remove the spring from the hook of the press lever as-

sembly.

(2) Remove the slit washer and remove the pinch roller seat

2. (See Fig.2-2-4a.)

(3) Remove the pinch roller arm assembly by pulling it up.

Slit washer

Pinch roller seat2

Spring

Pinch roller arm

Press lever assembly

Pinch roller arm assembly

assembly

Fig. 2-2-4a

2.2.5 Guide Arm Assembly and Press Lever Assembly

1. How to remove

(1) Remove the spring and expand the lug of the lid guide in

the arrow-indicated direction. Then remove the guide arm
assembly by pulling it up.

(2) Remove the press lever assembly by pulling it up. (See

Fig.2-2-5a.)

Screws(A)

Audio control head

Fig. 2-2-6a

Screws(B)

Audio control head

Compression

Audio control head
board assembly

Head base

springs

Fig. 2-2-6b

2. How to install

(1) To make the post-installation adjustment easier, set the

temporary level as indicated in Fig.2-2-6c. Also make sure
that the screw center (centre) is brought into alignment
with the center (centre) position of the slot.

A/C head

12.4 mm

Head base

Screw

2-8

Tension
spring

LugLid guide

Fig. 2-2-5a

Press lever
assembly

Guide arm
assembly

Head base

Audio control head

Fig. 2-2-6c

2.2.7 Loading Motor

1. How to remove

(1) Remove the belt wound around the worm gear.
(2) Open the two lugs of the motor guide and remove the

loading motor, loading motor board assembly and motor
guide altogether by pulling them up.

(3) When replacing the loading motor board assembly, take

care with the orientation of the loading motor. (Install so
that the loading motor label faces upward.)

(4) When the motor pulley has been replaced, choose the

fitting dimension as indicated in Fig.2-2-7a.

Loading motor board assembly

Loading motor

Lugs

Motor guide

6.5 ± 0.2 mm

LABEL

Motor pulley

Worm gear

Belt

Fig. 2-2-7a

2.2.8 Capstan Motor

1. How to remove

(1) Remove the belt (capstan) on the mechanism assembly

back side.

(2) Remove the three screws (A) and remove the capstan

motor.

Screws(A)

Screw(A)

Capstan motor

Belt

Fig. 2-2-8a

Spacer

Spacer

2. How to install (Centering the mounting position)

When the capstan motor has once been removed and then
reinstalled out of the initial correct position in the rotational
direction, the capstan motor current may be unstable during
operation in high or low temperatures. This may result in
greater Wow & Flutter and occasionally in power breakdown
because of current over - load. Install the capstan motor while
following the procedure given below.
(The capstan motor is centrally located when the unit is
shipped from the factory.)

(1) Provisionally tighten the three screws (A) securing the

capstan motor.

(2) Install the mechanism assembly to which the capstan

motor is provisionally fastened on the bottom chassis
which incorporates the Main board assembly. (No need
to tighten the screws for mounting the mechanism.)
Make sure that all the connectors for the mechanism as­sembly and the Main board assembly are correctly in­stalled as indicated in Fig. 2-2-8b.

(3) Making sure that the connector for the capstan motor is

correctly mounted, and securely tighten the three screws
(A).

Note:

• When the capstan motor has been replaced with a new
one, perform recording in the EP(or LP) mode for at
least 2 minutes at normal temperatures immediately be­fore starting the FF/REW or SEARCH operations (Ag­ing).

2.2.9 Pole Base Assembly (supply or take-up side)

1. How to remove

(1) Remove the UV catcher 2 on the removal side by loos-

ening the screw (A).

(2) Remove the pole base assembly on the supply side from

the mechanism assembly by loosening the screw (B) on
the mechanism assembly back side and sliding the pole
base assembly toward the UV catcher 2.

(3) As for the pole base assembly on the take-up side, turn

the pulley of the loading motor to lower the cassette
holder because the screw (B) is hidden under the con­trol plate. (See the “Procedures for Lowering the Cassette
holder assembly” of 1.3 DISASSEMBLY/ASSEMBLY
METHOD.) Further turn the motor pulley to move the cas­sette holder until the screw (B) is no longer under the con­trol plate (in the half-loading position). Then remove it as
done for the supply side by removing the screw (B).

Note:

• After reinstalling the Pole base assembly and the UV
catcher2, be sure to perform compatibility adjustment.

Fig. 2-2-8b

Connector for
the capstan motor

Screw(A)

UV catcher2

Screw(A)

UV catcher2

Screw(B)

Fig. 2-2-9a

2-9