JVC HR-DVS2EK-EU Service Manual

SERVICE MANUAL

Mini DV/S-VHS VIDEO CASSETTE RECORDER

VICTOR COMPANY OF JAPAN, LIMITED
VIDEO DIVISION

S40894

HR-DVS2EK/EU

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. 82829

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

Maximum recording time

HR-DVS2EK/EU

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 HR-DVS2EU)

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

ENTREE/SORTIE DV

DV IN/OUT

VHSDV

A.DUBINSERT

DUB
COPIE

PR

DV VHS

DV DECK VIDEO/AUDIO

Signal system : PAL-type colour signal, 625 lines

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

50 fields

(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 cable,
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 © 2000 VICTOR COMPANY OF JAPAN, LTD.

No. 82829

November 2000

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

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

1.4

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

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

2.2.16

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

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

2.3.3

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 V ideo 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 [HR-DVS2EU]................................................................ 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

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

4.25

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

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

4.30

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 (HR-DVS2EK and HR-DVS2EU) in this series.

HR-DVS2EK HR-DVS2EU

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 10 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

.2

5

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

CONNECTOR

FPC

CONNECTOR

FPC

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

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

CONNECTOR

FPC

Fig. 1-3-5

CONNECTOR

FPC

CONNECTOR

FPC

SYMBOL PARTS NO. COLOR

S1 QYTDST3006R SILVER BLACK

S4 QYTDSF2606Z GOLD

S8 PQ21623-2-5 GOLD

S5 QYTDST3006Z GOLD

S2 QYTDST3006M BLACK

S6 QYTDSF3008M BLACK

S3 QYTDSF3010Z GOLD

S7 QYTDST2610Z GOLD

S11 QYTDSP2004Z GOLD
S12 QYTDST2004Z GOLD
S13 YQ43893 SILVER

S9 PQ40413 BLACK

S10 LP40700-001A BLACK

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.

COM2 8(L3),

Point NotePart name

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

CN7507(WR1),
CN3011(WR2)

§§ §§ §

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

—

<Note
1,2,3,4>

1.3 DISCONNECTION OF CONNECTORS (WIRES)

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.

(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

Table 1-4-1

1-1

HOW TO REMOVE THE MAJOR PARTS <COM section>

Top cover

7

(S2)

5

(S2)

4

(S1)

3

(S1)

6

(S2)

2

(S1)

1

(S1)

1

(L1)

(L2)

1

8

(S3)

9

(S3)

Bracket

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

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

1.5.2

Disassembly/assembly method <COM section>

<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.

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

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

COM6 4(S2), 6(S6),

Fan motor

6

<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).

—

<Note
1,2,3,4>

—

<Note 1,
5>

<Note 1,
5>

<NOTE 6>Rear cover

<Note 2>

DV SIDE

Base (2)

<Note 3>

(L3)

(L3)

<Note 4>

FPC

DV Main board
assembly

Base (1)

(L3)

Fig. COM1

CN3011

<Note 4>

WR2

Fig. COM2

WR1

(L3)

<Note 2>
VHS SIDE

CN7507

<Note 1>
Supporting
tape side

2

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

23

S4

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)

(S4)

21

24

(S4)

(S4)

20

(S4)

2

Knob (Jog)

Knob (Shuttle)

3

Eject SW
board assembly

Jack board
assembly

9

23

(

)23(S4)

S4

25

(S4)

16

(S4)

15

(S4)

14

(S4)

17

(S4)

(S4)

(S4)
13

18

12

(S4)

Jog board assembly

10

11

(S4)

(S4)

LED/SW board
assembly

Display board
assembly

(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.

Drum assembly

1

(Inertia plate)
(Roller arm assy)
Mechanism

2

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

14

(S3)

16

(S5)

15

(S3)

9

(S6)

8

(S6)

11

(S6)

10

(S6)

12

(S6)

13

(S6)

WR16
Foil side
<Note 2>

CN5322

CN703

WR15

CN2601

CN3014

WR13
Foil side
<Note 2>

WR12
Foil side
<Note 2>

WR14
Foil side
<Note 2>

CN5321

17

(S3)

5

Note: When installing the Mechanism assembly, secure

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

15

(S3)

14

(S3)

WR12
Foil side
<Note 2>

WR13
Foil side
<Note 2>

CN3014

WR14
Foil side
<Note 2>

16

(S5)

WR15

9

(S6)

CN2601

CN703

CN5321

8

(S6)

(S6)

WR16
Foil side
<Note 2>

CN5322

10

(S6)

11

12

(S6)

13

(S6)

Fig. V3

Fig. V2

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)

CN5502

Base(2)

WR18

(S11)

CN5506

Fig. D1

5

Fig. D2

4

(S5)

CN5501

1

<Note 1>

WR7

WR19

6

(S11)

(L2)

WR20

CN5507

1-6

Earth

14

(

S13

)

16

(

S13

)

15

(

S13

)

5

<Note 2>

6

20

(S5)

WR15

CN3501

CN3701

CN1001

CN1002

WR14

<Note 3>

Supporting
tape side
<Note 3>

Foil side
<Note 4>

WR16

WR8

17

(S5)

19

(S5)

18

(S5)

plate

7

(

S12

WR22

)

(

S11

9

(S5)

8

)

10

(S5)

CN5505

CN5502

CN5001

3

CN5503

WR21

WR25

CN5504

11

(S4)

Fig. D3

12

(S4)

WR23

WR24

Fig. D5

13

(S4)

4

(L3)

Fig. D4

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

CN2601

7

D

C

4

CN5322

3

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 TERMINAL 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

TP701
D AGC

TP GND

VR701
DV AG C

S-Sub
board assembly

On screen
board assembly

VHS mechanism

Terminal board assembly

3D Digital
/2M board
assembly

VR401
D/A
LEVEL ADJ

Demodulator
board
assembly

TP106
PB FM

CN3011 CN7507

Supporting
tape side

TP2253
A.PB FM

TP4001
CTL.P

TP111
D.F F

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 9 , 10 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

CN506

CN512

CN7508

CN2601

CN3001

CN2001

CN1

CN1

CON1

CN7509

CN3014

6

3

16

17

4

9

5

8

7

12

13

11

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

Type

(FPC/

WIRE)

Fig.

No.

Symbol

Connection

Pin No.

Connected point ←→ Connected point

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

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

1-12

Table 1-10-1 Connection

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

[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.

– : –– : –– Normal display

E :

: **Emergency content display

**

E : ** : **Emergency content display

0 : 00 : 00

E: **:

1: *2 :

*

5: *6 :

*

CUSTOM CODE
43: A CODE
53: B CODE

DATA CODE

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

(E:Latest:Previous)

(E:Latest:Previous)

Normal display

Emergency content display

**

(E:Latest:Previous)

Emergency detail display

34

Emergency detail display

7

*

1 2

show the information

1

2

INITIAL MODE

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

Note:

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

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
Tape being loaded/unloaded (When the pole base is located on the front

-4
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

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

F1

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

2D - 2F

Note:

The values of cassette tape type 2 in the above table are

•

typical values with representative cassette tapes.

SECTION 2

Loading motor

Pole base assembly

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.)

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

T23

Tension brake

T22

assembly

Adjust pin

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

B2

Capstan brake assembly

B3 B5

Belt (capstan)

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

B11

Take-up lever

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 ¤R R
A/C head ¤R ¤R

Lower drum assembly
Pinch roller arm assembly ¤¤
Full erase head ¤¤
Tension arm assembly ¤¤

Tape transport

Capstan motor (Shaft) ¤¤
Guide arm assembly ¤¤
Capstan motor R
Capstan brake assembly R
Main brake assembly R
Belt (Capstan) RR
Belt (Loading motor) R
Loading motor R
Clutch unit R
Worm gear R
Control plate R
Brush ¤R ¤R
Tension brake assembly RR

Other Drive

Rotary encoder

: Cleaning

¤

: Inspection or Replacement if necessary

R

Operation Hours

~1000H ~2000H

¤¤R

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

Pole base assembly (take-up side)

2.2.9

T25

Pole base assembly (supply side)

2.2.9

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

2.2.14 Cassette gear B 2

B18

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

Loading arm gear (take-up side)

2.2.16

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

Sub brake assembly(take-up side)

2.2.19

T15

Main brake assembly(take-up side)

2.2.20

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

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

Relay gear

112
12

12

12 3

3

4 5

5 6

6 7

Cassette holder assembly

Drive gear

7

8

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)

(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)

(1) Insert the section

A

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.

Main deck right side

Fig. 2-2-3e

Drive arm

Hole

B

C

Drive arm

Fig. 2-2-3g

Cassette holder assembly

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

2.2.10 Rotary Encoder

1. How to remove

(1) Remove the screw (A) and remove the rotary encoder

by pulling it up. (See Fig. 2-2-10a.)

Rotary encoder (Front side)

Screw(A)

Guide marks

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

1. How to remove

(1) Release the two lugs of the rotary encoder guide in the

arrow-indicated direction and remove the change lever
assembly.

(2) Remove the slit washer retaining the direct gear and re-

move the latter.
Take care so as not to lose the washer and spring. (See
Fig.2-2-12a.)

Rotary encoder (Back side)

Positioning pin of the rotary encoder

Fig. 2-2-10a

Mark E

Shaft of the rotary encoder guide

Control plate

Fig. 2-2-10b

2. How to install (Phase matching)

(1) Make sure that the mark E of the control plate is in align-

ment with the mark

of the loading arm gear shaft and
bring the guide marks on the rotary encoder into align­ment as indicated in Fig.2-2-10a. (See Fig. 2-2-10a and
Fig. 2-2-10b.)

(2) Turn over the rotary encoder with its guide marks kept in

alignment and install it by fitting on the shaft of the rotary
encoder guide and the positioning pin.

(3) Tighten the screw (A) to complete the installation.

2.2.11 Clutch Unit

(1) Remove the belt wound around the capstan motor and

the clutch unit.

(2) Remove the slit washer and remove the clutch unit.

Change lever
assembly

Spring(B)

Lugs

Note:

• The parts with marked (
speed FF/REW type).

1 : Uses the standard type mechanism only.

*

2:

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

*

Slit washer

Washer (*1)

Spacer

Direct gear

Spring(A)
Position the projecting
side down.

Spacer (

1)

*

) have different types of mechanisms (standard type or high-

*

Clutch gear

Spring (C)

Coupling gear (

2)

*

Fig. 2-2-12a

2. How to install

(1) Install the clutch gear, spring (A), spring (C), direct gear,

spacer and others to the individual shafts of the main
deck, and finally the slit washer. (See Fig.2-2-12a.)

(2) Let the spring (B) drops into the rotary encoder guide hole

and install the change lever assembly.(Take care not to
mistake a direction of the spring.) The point is to slightly
lift the clutch gear and catch it from the both sides with
the assembly. (See Fig.2-2-12b.)

Rotary encoder guide

Spring(B)

Change lever assembly

Clutch gear

2-10

Belt

Clutch unit

Fig. 2-2-11a

Slit washer

Main deck Main deck

Fig. 2-2-12b

2.2.13 Link Lever

1. How to remove

(1) Remove the two slit washers.
(2) Remove the link lever by lifting it from the shaft retained

by the slit washers. Then swing the link lever
counterclockwise and remove it from the locking section
of the control plate.

Slit washers

2.2.14 Cassette Gear, Control Cam and Worm Gear

1. How to remove

(1) Remove the control cam by lifting it.
(2) Open the two lugs of the cassette gear outward and pull

the latter off.

(3) Remove the belt wound around the worm gear and the

loading motor.

(4) Open the lug of the lid guide outward and remove the

worm gear.

Link lever

Locking section of the
control plate

Fig. 2-2-13a

2. How to install (Phase matching)

(1) Slide the control plate so that its mark E is aligned with

the mark

on the loading arm gear shaft. (See Fig.2-2-

13b.)

(2) Rotate the worm gear until the guide hole of the control

cam is aligned exactly with the guide hole of the main
deck. (See Fig.2-2-13c.)

(3) Insert the link lever into the locking section of the control

plate. (See Fig.2-2-13a.)

(4) Rotate the link lever clockwise so that it is installed on

the shafts in the center (centre) and on the left of the con­trol cam.

(5) Fasten the slit washers at these two points.

Loading motor

Belt

Lug

Worm gear

Lugs

Cassette gear

Lid guide

Control cam

Fig. 2-2-14a

2.2.15 Control Plate

1. How to remove

(1) Remove the screw (A) retaining the control bracket 1 and

remove the latter.

(2) Slide the control plate as indicated by the arrow and re-

move the control plate. (See Fig.2-2-15a.)

Shaft of the rotary encoder guide

Fig. 2-2-13b

Worm gear

Main deck
guide hole

Control cam
guide hole

Cassette gear

Fig. 2-2-13c

Control plate

Control cam

Mark E

Screw(A)

Control
bracket1

Control
plate

Fig. 2-2-15a

2. How to install (Phase matching)

(1) Adjust the position of the idler arm assembly pin as indi-

cated in Fig.2-2-15b (to the left of center (centre) of the
R section).

(2) Bring the guide hole of the take-up lever into alignment

with the hole at the control plate guide and fix the posi­tion by inserting a 1.5 mm hexagonal wrench.

2-11

(3) Install the control plate so that the section A of the load-

ing arm gear shaft fits into the hole (A) of the control plate,
the section B of the control plate guide into the hole (B),
and the control plate comes under the section C of the
rotary encoder guide and the section D of the loading arm
gear shaft while press-fit the pole base assmebly (sup­ply side) as indicated by the arrow. It is important that
the tension arm assembly shaft is positioned closer to­ward you than the control plate. (See Fig.2-2-15c.)

(4) Make sure that the mark E of the control plate is in align-

ment with the mark

of the loading arm gear shaft. (See

Fig.2-2-15c.)

(5) Pull off the hexagonal wrench for positioning.

(3) Turn the loading arm gear (take-up side) clockwise so

that the notch of the loading arm gear (take-up side) is
in alignment with the projection of the loading arm gear
shaft and lift it.
Likewise, turn the loading arm counterclockwise so that
the notch is in alignment with the projection and remove
the loading arm gear (take-up side). (See Fig.2-2-16a and
Fig. 2-2-16b.)

(4) When removing the loading arm gear shaft, be sure of

first removing the screw retaining the drum assembly (on
the back side of the loading arm gear shaft). Then re­move the screw (C) and remove the loading arm gear
shaft by sliding it.

Idler arm assembly
pin

R section

Guide hole of the
control plate guide

Section D

1.5mm hexagonal wrench

Fig. 2-2-15b

Section A

Section D

Hole A

Press­fit

Take-up lever

Insert

Pole base assembly
(supply side)

Section A

Hole A

Pole base assembly
(take-up side)

Screw(B)

Torsion arm

Loading arm gear
(take-up side)

Projection B

Guide marks

Projection A

Pole base assembly
(supply side)

Screw(A)

Loading arm gear
(supply side)

Fig. 2-2-16a

Loading arm gear shaft

Loading arm gear (take-up side)

Notch

Screw(C)

Loading arm gear shaft

Section C

Section C

Section B

Hole B

Hole B

Section B

Control plate

Tension arm assembly
shaft

Fig. 2-2-15c

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

1. How to remove

(1) Remove the loading arm gear (supply side) by loosen-

ing the screw (A). (See Fig. 2-2-16a.)

(2) Remove the screw (B) and remove the torsion arm from

the pole base assembly (take-up side). (See Fig.2-2-16a.)

2-12

Fig. 2-2-16b

2. How to install

(1) Align the notch of the loading arm gear (take-up side) to

the projection B of the loading arm gear shaft and slip it
over. Then rotate it clockwise for alignment with the pro­jection A and slip it down to the bottom. (See Fig.2-2­16b.)

(2) Then turn the loading arm gear (take-up side)

counterclockwise. Hang the torsion arm on the pole base
assembly (take-up side) and tighten the screw (B).

(3) Install the loading arm gear (supply side) so that the guide

mark of the loading arm gear (take-up side) is in align­ment with the guide mark of the loading arm gear (sup­ply side). Then hang the torsion arm on the pole base
assembly (supply side) and tighten the screw (A). (See
Fig.2-2-16a.)

2.2.17 Take-up Lever, Take-up Head and Control Plate
Guide

(1) Remove the spring of the take-up lever from the main

deck.

(2) Remove the lug (A) of the take-up lever from the main

deck and pull out the take-up lever and the take-up head

together.
(3) Remove the screw (A).
(4) Align the idler arm assembly pin in the center (centre) of

the R section of the control plate guide, remove the con-

trol plate guide lugs (B) and (C) from the main deck, and

remove the control plate guide.

Idler arm assembly pin

Lug(C)

Screw(A)

Take-up lever

Take-up head

Lug(A)

Lug(B)

Control plate guide

Fig. 2-2-17a

2.2.18 Capstan Brake Assembly

1. How to remove

(1) Move the lug (A) of the capstan brake assembly in the

arrow-indicated direction so that it comes into alignment

with the notch of the main deck. (See Fig. 2-2-18a.)
(2) Remove the lug (B) of the capstan brake assembly from

the main deck and remove the capstan brake assembly.

Spring

Sub brake

Lug(A)

Lug(B)

assembly
(take-up side)

Lug(C)

Fig. 2-2-19a

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

1. How to remove

(1) Move the main brake assembly (take-up side) in the ar-

row-indicated direction and remove the reel disk (take­up side).

(2)

Remove the spring attached to the main brake assembly.

(3) Remove the lug (A) of the main brake assembly (take-

up side) and pull out the lug (B) after bringing it into align­ment with the main deck notch.

(4) Remove the lugs (C), (D) and (E) of the main brake as-

sembly (supply side) from the main deck and pull them
off. (See Fig.2-2-20a.)

(5) When installing the main brake assembly (take-up side),

slide the brake lever in the direction as indicated by the
arrow to prevent it from hitting the projection of the main
brake assembly (take-up side). (See Fig.2-2-20b.)

Main brake assembly
(supply side)

Reel disk
(take-up side)

Main brake assembly
(take-up side)

Lug(B)

Lug(A)

Capstan brake assembly

Fig. 2-2-18a

2.2.19 Sub Brake Assembly (take-up side)

1. How to remove

(1) Remove the spring attached to the lid guide and sub

brake assembly (take-up side).

(2) Bring the lug (A) of the sub brake assembly (take-up side)

into alignment with the notch of the main deck.

(3) Remove the lugs (B) and (C) of the sub brake assembly

(take-up side) from the main deck and remove the sub
brake assembly (take-up side).

Lug(B)

Lug(C)

Lug(D)

SpringLug(E)

Lug(A)

Notch

Fig. 2-2-20a

1)

(

*

Brake
lever

Note:

• The parts with marked ( *) have different types of mechanisms (standard type
or high-speed FF/REW type).
1 : Uses the standard type mechanism only.

*

Rotary encoder guide

Projection of the main
brake assembly
(take-up side)

Fig. 2-2-20b

2-13

2.2.21 Tension Brake Assembly, Reel Disk (supply side)

(

)

and Tension Arm Assembly

1. How to remove

(1) Remove the three lugs of the tension brake assembly

from the main deck and pull them off.

(2) Remove the reel disk (supply side) by loosening in the

arrow-indicated direction the main brake assembly (sup­ply side).

(3) Remove the tension spring on the back of the main deck.

Then release the lug of the tension arm bearing in the
arrow-indicated direction and draw out the tension arm
assembly. (See Fig. 2-2-21a.)

Lug of the tension
arm bearing

Tension arm
assembly

Reel disk
(supply side)

2.2.23 Stator Assembly

(1) Remove the flat cable.
(2) Remove the two screws (A).
(3) Remove the stator assembly by lifting in the arrow-indi-

cated direction. (Take care that the brush spring does not
jump out.)

(4) After installation, be sure to perform the PB switching

point adjustment according to the electrical adjustment
procedure.

Screws(A)

Tension brake
assembly

Lugs

Tension spring Main brake assembly

supply side

Fig. 2-2-21a

2.2.22 Idler Lever, Idler Arm Assembly

1. How to remove

(1) Remove the lug of the idler lever from the main deck and

remove the hook fitted in the idler arm assembly hole by
lifting it.

(2) Remove the slit washer and pull out the idler arm assem-

bly.

Lug Idler lever

Stator assembly

Flat cable
(Take care not to mix up the
polar faces when installing.)

Fig. 2-2-23a

2.2.24 Rotor Assembly

(1) Remove the stator assembly.
(2) Remove the two screws (B) and remove the rotor assem-

bly.

Note:

• When installing the rotor assembly, note that a normal
picture cannot be obtained without ensuring the phase
matching as mentioned below.

(3) Match the phases of the upper drum assembly and the

rotor assembly as indicated in Fig.2-2-24a.

(4) Place the upper drum assembly hole (a) over the rotor

assembly holes (b) (with three holes to be aligned) and
tighten the two screws (B). (See Fig.2-2-24a.)

2-14

Fig. 2-2-22a

Hook

Idler arm
assembly

Slit washer

Screws (B)

Screw holes

Upper drum
assembly

Rotor assembly

Fig. 2-2-24a

Hole(a)

The hole is not in
line but is offset
toward the right.

Hole(b)

2.2.25 Upper Drum Assembly

1. How to remove

(1) Remove the stator assembly and rotor assembly.
(2) Loosen the screw of the collar assembly using a 1.5 mm

hexagonal wrench and remove the collar assembly. Also
remove the brush, spring and cap at one time.

(3) Remove the upper drum assembly and remove the

washer using tweezers.

Note:

• When replacement is required, control the up- down
movement of the brush. Never apply grease.

Lower drum assembly

Coil parts

Upper drum assembly

Spring

Brush

Upper drum
assembly

Washer

Collar
assembly

Loosen

Cap

Shaft

1.5 mm
hexagonal wrench

Lower drum assembly

Fig. 2-2-25a

2. How to install

(1) Clean the coil parts of the lower drum assembly and the

newly installed upper drum assembly with an air brush
in advance. (See Fig.2-2-25b.)

(2) Install a new washer and upper drum assembly on the

drum shaft. (See Fig.2-2-25a.)

Note:

• When replacing the upper drum assembly, replace it
the together with the washer.

(3) Install the cap to the upper drum assembly.
(4) Position the collar assembly as indicated in Fig.2-2-25c

while controlling its up- down movement.

(5) Secure the collar assembly in position with a hexagonal

wrench while pressing its top with the fingers.

(6) After installation, gently turn the upper drum assembly

with your hand to make sure that it turns normally. Then
install the brush and the spring.

(7) Install the rotor assembly and stator assembly according

to Fig 2-2-23a and 2-2-24a.

(8) When installation is complete, clean the upper drum as-

sembly and lower drum assembly and carry out the fol­lowing adjustments.

• PB switching point adjustment

• Slow tracking adjustment

• Compatibility adjustment (Be sure to check for compat-

ibility for the EP (or LP) mode.)

Upper drum
assembly

Collar
assembly

Fig. 2-2-25b

Fig. 2-2-25c

Press

Fig. 2-2-25d

Collar
assembly

Tighten

2-15

2.3 COMPATIBILITY ADJUSTMENT

Notes:

• Although compatibility adjustment is very important,
it is not necessary to perform this as part of the nor­mal servicing work. It will be required when you have
replaced the audio control head, drum assembly or any
part of the tape transport system.

• To avoid any damage to the alignment tape while per­forming the compatibility adjustment, get a separate
cassette tape (for recording and play back) ready to
be used for checking the initial tape running behavior.

• Unless otherwise specified, all measuring points and
adjustment parts are located on the Main board.

• 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.

(6) Make sure that the V.PB FM waveform varies in parallel

and linearly with the tracking operation again. When re­quired, perform fine-adjustment of the guide roller of the
pole base assembly (supply or take-up side).

(7) Unload the cassette tape once, play back the alignment

tape (A1) again and confirm the V.PB FM waveform.

(8) After adjustment, confirm that the tape wrinkling does not

occur at the roller upper or lower limits. (See Fig. 2-3­1d.)

[Perform adjustment step (9) only for the models

equipped with SP mode and EP (or LP) mode.]

(9) Repeat steps (1) to (8) by using the alignment tape (A2).

CUSTOM CODE
43: A CODE
53: B CODE

DATA CODE

INITIAL MODE

Fig. 2-3a Jig RCU [PTU94023B]

2.3.1 Checking/Adjustment of FM Waveform Linearity

Signal (A1) •

(A2) •
Mode (B) • PB
Equipment (C) • Oscilloscope
Measuring point (D) • TP106 (PB. FM)
External trigger (E) • TP111 (D.FF)
Adjustment part (F) • Guide roller [Mechanism assembly]
Specified value (G) • Flat V.PB FM waveform
Adjustment tool (H) • Roller driver [PTU94002]

Alignment tape(SP, stairstep, PAL) [MHPE]
Alignment tape(LP, stairstep, PAL) [MHPE-L]

(1) Play back the alignment tape (A1).
(2) Apply the external trigger signal to D.FF (E), to observe

the V.PB FM waveform at the measuring point (D).

(3) Press the channel buttons (+, –) simultaneously to enter

the manual tracking mode. This also brings tracking to
the center (centre).

(4) Make sure that there is no significant level drop of the

V.PB FM waveform caused by the tracking operation, with
its generally parallel and linear variation ensured. Per­form the following adjustments when required. (See Fig.
2-3-1a.)

(5) Reduce the V.PB FM waveform while pressing the chan-

nel buttons (+, –) during playback. If a drop in level is
found on the left side, turn the guide roller of the pole
base assembly (supply side) with the roller driver to make
the V.PB FM waveform linear.
If a drop in level is on the right side, likewise turn the guide
roller of the pole base assembly (take-up side) with the
roller driver to make it linear. (See Fig. 2-3-1c.)

Max level

Proper waveform variation

Improper waveform variation

Fig. 2-3-1a

Roller driver

Fig. 2-3-1b

Min level

Guide roller (supply side)

2-16

A

(2)

(3)

(1)

AUDIO OUT

Head base

Audio control head

CTL. P

Level drop at the guide roller (supply side)

C

Level drop at the guide roller (take-up side)

• Proper waveform variation: Always flat

B

the manual tracking mode. This also brings tracking to
the center (centre).

(4) Adjust the AUDIO OUT waveform and Control pulse

waveform by turning the screws (1), (2) and (3) little by
little until both waveforms reach maximum. The screw (1)
and (3) are for adjustment of tilt and the screw (2) for azi­muth.

D

(3) Press the channel buttons (+, –) simultaneously to enter

• Improper waveform variation:
Higher Lower

Fig. 2-3-1c

Fig. 2-3-2a

2.3.3 Checking/Adjustment of the Audio Control Head

Improper

(a) Guide roller

(b) Guide pole

Fig. 2-3-1d

Proper

Phase (X-Value)

Signal (A1) •
Mode (B) • PB
Equipment (C) • Oscilloscope
Measuring point (D) • TP106 (PB. FM)
External trigger (E) • TP111 (D.FF)
Adjustment part (F) •
Specified value (G) • Maximum V.PB FM waveform
Adjustment tool (H) • A/C head positioning tool [PTU94010]

Alignment tape(SP, stairstep, PAL) [MHPE]

A/C head base [Mechanism assembly]

(1) Play back the alignment tape (A1).

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

Note:

• Set a temporary level of the height of the A/C head in

advance to make the adjustment easier after the A/C
head has been replaced. (See Fig.2-2-6c.)

Signal (A) •
Mode (B) • PB
Equipment (C) • Oscilloscope
Measuring point (D1) • AUDIO OUT terminal

(D2) • TP4001 (CTL. P)
External trigger (E) • TP111 (D.FF)
Adjustment part (F) • A/C head [Mechanism assembly]
Specified value (G) • Maximum waveform

(1) Play back the alignment tape (A).

Alignment tape(SP, stairstep, PAL) [MHPE]

(2) Apply the external trigger signal to D.FF (E), to observe

the AUDIO OUT waveform and Control pulse waveform
at the measuring points (D1) and (D2) in the ALT mode.

(2) Apply the external trigger signal to D.FF (E), to observe

the V.PB FM waveform at the measuring point (D).

(3) Press the channel buttons (+, –) simultaneously to enter

the manual tracking mode. This also brings tracking to
the center (centre).

(4) Loosen the screws (4) and (5), then set the A/C head

positioning tool to the innermost projected part of the A/
C head. (See Fig. 2-3-3a.)

(5) Turn the A/C head positioning tool fully toward the cap-

stan. Then turn it back gradually toward the drum and
stop on the second peak point position of the V.PB FM
waveform output level. Then tighten the screws (4) and
(5).

(6) Perform the tracking operation and make sure that the

V.PB FM waveform is at its maximum.
If it is not at maximum, loosen the screws (4) and (5),
and turn the A/C head positioning tool to bring the A/C
head to a position, around where the waveform reaches
its maximum for the first time. Then tighten the screws
(4) and (5).

2-17

[Perform adjustment steps (7) to (10) only for 2 Head

models equipped with LP mode.]

(7) Then play back the alignment tape (A2).
(8) Press the channel buttons (+, –) simultaneously to enter

the manual tracking mode. This also brings tracking to
the center (centre).

(9) Perform the tracking operation and make sure that the

V.PB FM waveform is at its maximum.

(10)

If it is not at maximum, loosen the screws (4) and (5),
and turn the A/C head positioning tool to bring the A/C
head to a position, around where the waveform reaches
its maximum for the first time. Then tighten the screws
(4) and (5).

Note:

• After adjusting, always perform the confirmation and
re-adjustment of the item 2.3.4.

Toward the drum

A/C head positioning tool

To the drum

Audio control head

Toward the capstan

Head base

Screw

Screw

To the capstan

(4)

(5)

Fig. 2-3-3a

Alignment tape
[SP, stairstep]
played with the
SP head

Alignment tape
[EP(LP), stairstep]
played with the
EP(LP) head

(1) Play back the alignment tape (A).
(2) Apply the external trigger signal to D.FF (E), to observe

the V.PB FM waveform at the measuring point (D).

(3) Confirm that the automatic tracking operation is com-

pleted.

(4) Set the VCR to the Auto adjust mode by transmitting the

code (F) twice from the Jig RCU. When the VCR enters
the stop mode, the adjustment is completed.

(5) If the VCR enters the eject mode, perform adjustment for

the audio control head phase (X-value) again.

2.3.5 Checking/Adjustment of the Tension Pole Position

Signal (A) • Back tension cassette gauge

Mode (B) • PB
Adjustment part (F) • Adjust pin [Mechansim assembly]
Specified value (G) • 25 - 51 gf•cm (2.45 – 5 × 10-3 Nm]

[PUJ48076-2]

(1) Play back the back tension cassette gauge (A).
(2) Check that the indicated value on the left side gauge is

within the specified value (G).

(3) If the indicated value is not within the specified value (G),

perform the adjustment in a following procedure.

1) Set the VCR to the mechanism service mode. (See

1.5 MECHANISM SERVICE MODE.)

2) Set the VCR to the play back mode and adjust by turn­ing adjustment pin to align the tension arm assembly
edge with the main deck hole (A) on the right edge
marker. (See Fig. 2-3-5a)

Tension arm
assembly

Hole (A)

Edge

Waveform output

X-value adjustment point

Drum side Control head position Capstan side

Maximum

Fig. 2-3-3b

2.3.4 Checking/Adjustment of the Standard Tracking
Preset

Signal (A) •
Mode (B) • PB ¥ Auto adjust
Equipment (C) • Oscilloscope
Measuring point (D) • TP106 (PB. FM)
External trigger (E) • TP111 (D.FF)
Adjustment part (F) • Jig RCU: Code “50”
Specified value (G) • STOP mode

Adjustment tool (H) • Jig RCU [PTU94023B]

Alignment tape(LP, stairstep, PAL) [MHPE-L]

(Maximum V.PB FM waveform)

Marker

0.5 mm

Tension arm assembly

Tension brake assembly

Adjust pin

Fig. 2-3-5a

2-18

Mechanism Timing Chart

Mechanism mode

Control plate mark

Rotary encoder

Control cam angle

EJECT

END

E U CI

HIGH

C CH

LOW

HIGH

B CH

LOW

HIGH

A CH

LOW

0

CASS-

UP

69 136 370 412.

CASS-INS

FF/REW

FR

230

STOP

ST

264.

REV

R

7

318.

7

SLOW/STILLPPLAY

SL

42

Rotary encoder
angle

Pole base

Pinch roller

Guide arm

Tension arm

Main brake S

Main brake T

Sub brake S

Sub brake T

Capstan brake

Direct gear

Change lever 2

Idler position

Take-up lever

Rec safety switch

Operation mode

HALF PRESS

CONTACT

ON PLAY

ON REV

CONTACT

(C-INS)

HALF REV

HALF FF/REW

CONTACT

CONTACT

IN FF/REW

OUT PLAY

SUPPLY

CENTER

TAKE-UP

READY

RESET

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

0

20 42.652.

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

6

6

114.

150.4167.8178.

8

Timer REC

(drum at stop)

POWER OFF

(cassette loaded)

207.2218.2240.2251.

standby

STOP

Backspace Slow FOR

Search REW

Slow REW

2

293.2304.2320.4335

REC pause

REC

Search FF

STOP

(

drum

in motion)

2-19

2-20

MECHANISM ADJUSTMENT (DV)

Part number

(W1)

(W3)

YQ44246

YQ43933-2

Symbol

Part numberSymbol

(W2)

YQ44246-3

Color

RED

BLACK

BLACK

(S1)

(S2)

(S3)

QYTDSP2004Z

YQ43893-7

Color

GOLD

SILVER

BLACK

YQ43893

2.9 PREPARATION

2.9.1 Precautions

(1) Observe the specified screw tightening torque when at-

taching parts. The torque should be 0.04 Nm (0.4 kgfcm)
unless otherwise specified.

(2) Always disconnect the power supply unit before proceed-

ing to solder or attach parts.

(3) When plugging or unplugging a wire, be careful not to

damage the connector.

(4) When replacing a part, be careful not to damage other

parts or to mistakenly attach parts.

2.9.2 Tools Required for Adjustments

TORQUE DRIVER

12

YTU94088

Tool for replacing tip IC

4

PTS40844-2

BIT

YTU94088-003

Table 2-9-1 Tools Required for Adjustments

2.9.3 Disassembly and Assembly Procedures

The following table shows the steps for assembling or dis­assembling the mechanism parts. Read the following descrip­tions carefully before actual assembly/disassembly opera­tions.

: Order of disassembly steps. Reverse this order when

(1)

assembling.

: Name of the disassembled/assembled part.

(2)

: Surface where the disassembled/assembled part is

(3)

mounted. T = Top. B: Bottom.

: Number of disassembly drawing.

(4)

Tool for installing slit washer

3

YTU94121A

: Parts to be removed in disassembly/assembly, such as

(5)

screws, washers and springs, and the points.

Symbol Name & Point

S Screw

W Washer

P Spring

*

Connector, lock(L), soldering(SD),
shield, etc.

[Example] • (W1) = Remove the washer W1.

• (P1) = Remove the spring P1.

: Notes for disassembly/assembly.

(6)

: For the phase alignment in disassembly/assembly and

(7)

the parts which require phase adjustments after assem­bly, see “2.16 MECHANISM PHASE CHECK/ADJUST­MENT”.

2.9.4 Screws and Washers Used in Disassembly/As­sembly of the Mechanism Assembly

Table 2-9-1 shows the symbols, designs, part numbers and
colors of the screws and washers used in the mechanism
assembly.
When disassembling or assembling the mechanism assem­bly, be sure to attach screws and washers correctly by refer­ring to the following table.

Table 2-9-2

Step
/Loc Part Name

No.

1

A Cassette housing assembly/ B Mechanism assembly T 1

2 1 Drum assembly T 2 3(S2) 2,3

3 2 Motor bracket assembly T 2 4(S2) 2,4

4 3 Middle catcher assembly T 3 3(S2) —

Fig.

No.

2(S1),(L1) – (L5)

Point Note Discription

1

§§ §§§§§

(1) (2) (3) (4) (5) (6) (7)

2-21

2.10 DISASSEMBLY/ASSEMBLY OF THE MECHANISM

ASSEMBLY

2.10.1 Introduction

The disassembly and assembly of the mechanism assem­bly should usually be performed in the ASSEMBLY mode.
(Table 2-10-1)
Note that the mechanism is in the cassette in (C-IN) mode
when the mechanism assembly is taken out of the set and
that the C-IN mode should be switched to the ASSEMBLY
mode in this case.

To set the ASSEMBLY mode, apply 3 V DC to the electrodes
on the upper part of the loading motor as shown in Fig. 2­10-7.

MODE

PARTS

1

ROTARY
ENCORDER

R. ENC -20

MAIN CAM GEAR 0

2

3

36°

C-IN

ASSEMBLY

17°

S. FF

30.33°

36.33°

0

15

33.33

40

Table 2-10-1

2.10.2 Mechanism Modes

The mechanism has 6 modes as shown in Table 2-11-1. The
current mode can be confirmed by the positioning of the “
marking on the sub-cam gear and the “

” marking on the

”

mechanism.
See the following figures (Figs. 2-10-1 to -6) for details.

Note:

This mechanism assembly has another ASSEMBLY

•

mode. However, this mode cannot be identified from the
markings because it corresponds to an intermediate po­sition between the C-IN (

C

) mode and S-FF ( H ) mode.
This mode can be confirmed by the rotary encoder
phase. See Fig. 2-10-7.

LOADING END

87°

166.66

PLAY REV STOP FF/REW

223.66°

229.66°

226.66

185

140

190.33°

196.33°

169.66°

193.33

160

270.33°

273.33

220

276.33°

303.66°

306.66

245

1. Checking the mechanism mode

C H P

H

Fig. 2-10-1 Fig. 2-10-2 Fig. 2-10-3

R S F

Fig. 2-10-4 Fig. 2-10-5 Fig. 2-10-6

2-22

2. Setting/checking the ASSEMBLY mode

Wire (Brown)

Note:

• In this ASSEMBLY mode, only the 2
gear teeth of the rotary encoder are
marked (red coloring).

Marking

Wire (Red)

(Colored red)

DC 3 V

Motor Bracket Assembly (Loading Motor)

Rotary Encoder

< ASSEMBLY >

C

H

Fig. 2-10-7

2-23

2.11 MECHANISM TIMING CHART

See following table (Table 2-11-1).

MODE

PARTS

36°

1

ROTARY
ENCODER

2

3

ROTARY ENCODER

MAIN CAM 0

SUB CAM

POLE BASE

CTL PLATE

FF/REW

MAIN BRAKE(SUP)

MAIN BRAKE(TU)

SUB BRAKE

ON(REV MODE PRESS UP)

ON(PLAY MODE)

PINCH ROLLER

EXIT GUIDE ARM

HALF LOADING

TENSION ARM

BAND ARM PLATE

CLUTCH LOCK

SUP CENTRRING

OFF

S/REV

PLAY

ON 1

ON 2

OFF

ON 1

ON 2

OFF

OFF

OFF

ASSY

OFF

OFF 1

OFF 2

OFF

OFF 1

OFF 2

ASSEMBLY

C-IN

17°

-20

0

15

0

ON

ON

ON

ON

ON

S. FF

30.33°

33.33

40

4015

36.33°

87°

LOADING END

169.66°

166.66

140

140

PLAY REV STOP FF/REW

270.33°

276.33°

223.66°

226.66

185

185

229.66°

303.66°

273.33

220

220

306.66

245

245

190.33°

193.33

160

160

196.33°

CENTERRING ARM

2-24

S/REV

Table 2-11-1

2.12 MECHANISM ASSEMBLY/DISASSEMBLY PROCEDURE TABLE

Step
/Loc Part Name

No.

1 A Cassette housing assembly/ B Mechanism assembly

2 1

Drum assembly T 2-13-2 3(S2) 2,3

3

2 Motor bracket assembly T 2-13-2 4(S2) 2,4

4 3 Middle catcher assembly T 2-13-3 3(S2) —

5 4 Reel cover assembly T 2-13-3 (S2), 2(L6) 5

6 5 Pinch roller arm assembly T 2-13-4 (W1), (L7) 6

7 6 Sub brake assembly T 2-13-4 (P1), (W1), (L8) —

8 7 Band arm plate sub assembly T 2-13-4 (S3), (L9), (P2), (W2) 7,8

9 8 Tension arm sub assembly T 2-13-4 (P3) 8

10 9 EXIT guide arm assembly T 2-13-5 (W1) —

11 10 Swing arm assembly T 2-13-5 ——Position alignment

12 11 Sub deck assembly T 2-13-6 4(S2) 9 Position alignment

13 12 Main brake (Sup) assembly T 2-13-6 (P4), (L10) —

14 13 Main brake (Take up) assembly T 2-13-6 (P5), (L11) —

15 14 Reel disk assembly (Sup) T 2-13-7 ——

16 15 Reel disk assembly (Take up) T 2-13-7 ——

17 16 Prism T 2-13-7 (S2) —

18 17 Control plate T 2-13-7 2(L12) —

19 18 Guide rail (Take up) assembly T 2-13-8 4(S2) 10 Position alignment

20 19 Guide rail (Sup) assembly T 2-13-8 (S2), 2(L13) 10 Position alignment

21 20 Base plate assembly T 2-13-8 (S2), 2(L14) —

22 21 Ent. guide base assembly T 2-13-9 (S2) —

23 22 Worm wheel 2 T 2-13-9 — 11 Phase alignment

24 23 Timing belt T 2-13-9 ——

25 24 Center gear assembly T 2-13-9 ——

26 25 Reel drive pulley assembly T

27 26 Push plate T

28 27 Clutch lock gear(2) T

29 28 Clutch lock gear (1) T

30 29 Tension control arm assembly T

31 30 Brake control arm assembly T

32 31 Charge arm assembly T

33 32 Connect gear 2 T

34 33 Connect gear 2 T

35 34 Rotary encoder assembly T

36 35 Main cam T

37 36 Arm gear 1 assembly T

38 37 Centering arm assembly T

39 38 Sub cam T

40 39 Arm gear 2 assembly T

41 40 Clutch lock lever assembly T

42 41 Capstan motor T

43 42 Drum base deck T

Fig.

No.

T 2-13-1 2(S1),(L1) – (L5) 1

2-13-10

2-13-10

2-13-10

2-13-10

2-13-11

2-13-11

2-13-11

2-13-12

2-13-12

2-13-13

2-13-13

2-13-13

2-13-13

2-13-14

2-13-14

2-13-14

2-13-15

2-13-15

(W1) —

(W1) —

(W3) —

(P6) —

(L15) 12 Position alignment

(W1), (L16) 12 Position alignment

(L17) 13 Position alignment

(S2) — (Phase alignment)

(S2) — (Phase alignment)

2(S2) 14 Phase alignment

(W1) 15 Phase alignment

Collar 15,16 Position alignment

(L18) 15 Position alignment

(S2) 17 Phase alignment

— 17 Position alignment

(L19) 17,18 Position alignment

(P7), Adjust nut — Vertical adjustment

3(S2) —

Point Note Discription

Table 2-12-1

2-25

TOP VIEW

21

11

22

8

34

35

14

37

7

29

2 19 42 1 18 41 3

9

23

25

5

15

10

38

39

31

30

17 12 16 36 20 4 32 26

Fig. 2-12-1

6

40

–

33 24 1328

2-26

2.13 DISASSEMBLY/ASSEMBLY

1.

A Cassette Housing Assembly/ B Mechanism Assembly

1

(S1)

<Note 1> : If the wires for the cassette housing motor are

connected to the circuit board, remove them be­fore disassembly.

(L3)

A

(L4)

(L1)

Fig. 2-13-1

(L5)

<Note1>

2

(S1)

(L2)

B

2. 1 Drum assembly / 2 Motor bracket assembly

3

4

(S2)

(S2)

8

(S2)

<Note2>

9

(S2)

6

(S2)

7

(S2)

<Note4>

2

<Note3>

<Note2>

1

5

(S2)

<Note 2> : If wires are connected to the circuit board, re-

move them before disassembly.

<Note 3> : Be careful not to damage the drum assembly

when removing it.

<Note 4> : The bracket (DV) may come in the way of re-

moval of screw (7). Be sure to remove the
bracket before proceeding to the screw removal.

Fig. 2-13-2

2-27

3. 3

Middle Catcher Assembly/

4

<Note5>

(L6)

(L6)

4 Reel Cover Assembly

13

(S2)

Fig. 2-13-3

12

(S2)

10

(S2)

<Note 5> : Once the reel cover assembly has been re-

moved, the parts located below it tend to slip out
easily: Be careful.

11

(S2)

3

4.

5 Pinch Roller Arm Assembly/ 6 Sub Brake Assembly/
7 Band Arm Plate Sub Assembly/ 8 Tension Arm Sub
Assembly

<Note 8>:

How to install the spring

Step 1

Hook a

8

Step 2

Hook b

(W1)

(P2)

14

(S3)

(P3)

(W2)

7

<Note7>

NOTE8

5

Step 3

<Note6>

(L9)

<Note 6> : When attaching this part, fit it in the boss (L7)

on the charge arm assembly.

<Note 7> : When attaching or removing this part, take care

of the handling of the band section.

<Note 8> : After fitting the spring on the shaft, engage it with

hook a first then with hook b .
After attaching it, set it to the positioning shown
in “Step 3” and confirm that band arm plate sub
assembly 7 can be rotated in the direction of
the arrow as shown below.

(W1)

6

2-28

(P1)

Fig. 2-13-4

(L7)

(L8)

Fig. 2-13-4A

9 EXIT Guide Arm Assembly/ 10 Swing Arm Assembly

5.

10

9

(W1)

Fig. 2-13-5

6.

11 Sub Deck Assembly/ 12 Main Brake (Sup) Assembly/
13 Main Brake (Take up) Assembly

15

(S2)

(P4)

(P5)

13

12

(

L10

16

(S2)

)

(

)

L11

<Note9>

18

(S2)

17

(S2)

11

<Note 9> : When attaching the sub deck assembly, make

sure to adjust the phase of the control plate.

Fig. 2-13-6

2-29

7.

14 Reel disk assembly (Sup) / 15 Reel disk assembly
(Take up) / 16 Prism / 17 Control plate

14

15

17

(

L12

(

)

L12

Fig. 2-13-7

8.

18 Guide rail (Take up) assembly / 19 Guide rail (Sup)
assembly / 20 Base plate assembly

19

(S2)

16

)

11

20

(

L14

<Note 10> : When attaching, set the alignment markings of

the two gears so that the markings face oppo-

(

)

L13

24

<Note10>

(S2)

19

25

(S2)

)

21

(S2)

20

(S2)

22

(S2)

18

23

(S2)

site to each other.

19

18

Fig. 2-13-8A

2-30

Fig. 2-13-8

21

Ent. guide base assembly /

9.
23

Timing belt / 24 Center gear assembly

26

(S2)

22

21

<Note11>

22

Worm wheel 2 /

23

24

<Note 11> : How to attach the worm wheel 2 22 .

22

34

Align the phase of the rotary encoder assembly 34 ,
then attach it by aligning the phase hole of the mecha­nism assembly.

Fig. 2-13-9A

Phase alignment

Mark (Red)

Fig. 2-13-9

10.

25

Reel drive pulley assembly / 26

27

Clutch lock gear(2) / 28 Clutch lock gear (1)

(W1)

26

27

(W3)

(P6)

28

Push plate

(W1)

25

Fig. 2-13-10

2-31

29 Tension control arm assembly/ 30 Brake control

11.
arm assembly /

31

Charge arm assembly

(

)

L16

(W1)

30

(

<Note12>

(

)

L15

L17

)

<Note13>

29

31

<Note 12> : How to attach the tension control arm assem-

bly 29 / Brake control arm assembly 30 .

34

30

Boss

29

(Phase alignment)

35

Align the phase of the main cam 35 , then attach it by
fitting the bosses into the cam slot.

Fig. 2-13-11A

<Note 13> : How to attach the charge arm assembly 31 .

12.

Fig. 2-13-11

32

Connect gear 2 / 33 Connect gear 2

27

(S2)

32

28

(S2)

33

31

39

38

Phase alignment

Boss
(Phase alignment)

Align the phase of the sub cam 38 , then attach it by
fitting the boss into the cam slot.

Fig. 2-13-11B

2-32

Fig. 2-13-12

34 Rotary encoder assembly / 35 Main cam /

34

35

Phase alignment

Mark (colored : red)

13.
36

Arm gear 1 assembly / 37 Centering arm assembly

29

COLLAR

<Note15>

36

<Note14>

34

(

)

L18

<Note16>

37

<Note15>

(S2)

30

(S2)

(W1)

35

<Note15>

<Note 14> :

How to attach the rotary encoder assembly 34 .

Align the phase of the main cam 35 , then attach it by
placing the (red) coloured markings (on 2 gear teeth)
within the encircled area.

Fig. 2-13-13A

<Note 15> : How to attach the main cam 35 .

Fig. 2-13-13

Phase alignment

Boss

35

Boss

36

Phase alignment

37

Phase alignment

Align the phases of the arm gear 1 assembly 36 and
centering arm assembly 37 , then attach the arm gear 1
assembly 36 /centering arm assembly 37 by fitting the
bosses into the lower cam slot, and fit the slit washer.

Fig. 2-13-13B

<Note 16> :

How to remove the centering arm assembly 37
The center arm assembly is located behind the
mechanism assembly when the phase is
aligned correctly. The center arm assembly can
be removed by displacing it in the direction of
the arrow.

L18

37

Phase alignment

Fig. 2-13-13C

2-33

38 Sub cam / 39

14.

Arm gear 2 assembly /

40 Clutch lock lever assembly

<Note 17> : How to attach the sub cam 38 .

15.41

<Note17>

40

<Note18>

(

)

L19

Fig. 2-13-14

Capstan motor / 42

31

(S2)

<Note17>

38

Drum base deck

<Note17>

39

Boss

39

38

Phase alignment

Phase alignment

40

Phase alignment

Align the phases of the arm gear 2 assembly 39 and
clutch lock lever assembly 40 , then attach them by
fitting the boss into the lower cam slot and tighten the
screws.

Fig. 2-13-14A

<Note 18> :

How to remove the clutch lock lever assembly 40
L19 is located behind the mechanism assem­bly when the phase is aligned correctly. The
clutch lock lever assembly can be removed by
displacing it in the direction of the arrow.

Phase alignment

40

42

32

(S2)

33

(S2)

ADJUST NUT

Fig. 2-13-15

34

(S2)

L19

Fig. 2-13-14B

41

(P7)

2-34

2.14 LIST OF PROCEDURES FOR DISASSEMBLY

7

8

12

17

35

30

22

29

34

23

24

20

36

40

27

26

B

28

39

5

31

25

33

9

21

13

11

14

15

16

6

2

38

42

3

19

41

37

32

1

18

10

4

(W2)

(P3)

14(S3)

15

(S2)

23

(S2)

22

(S2)

10

(S2)

11

(S2)

3

(S2)

4

(S2)

24

(S2)

5

(S2)

12

(S2)

34

(S2)

27

(S2)

28

(S2)

(P7)

ADJ.
NUT

32

(S2)

33

(S2)

26

(S2)

30

(S2)

25

(S2)

29

(S2)

(W1)

(W1)

(W1)

(W1)

(W1)

COLOR

(W3)

(P6)

(W1)

31(S2)

20

(S2)

18

(S2)

21

(S2)

17

(S2)

7(S2)

9(S2)

8(S2)

6(S2)

19

(S2)

13

(S2)

(W1)

16

(S2)

Note :

• For the greasing and oiling locations,
see “SECTION 5 PARTS LIST” (Page 5-6).

Fig. 2-14-1

2-35

2.15 MECHANISM DISASSEMBLY/ASSEMBLY SHEET

Fig. No.

No.

Type

A 1 2 3 4 7 11

1 18234567891011121314151617

S1

Attachin

Ref. Fig.

Screw Management Table

2-13-1 2-13-2 2-13-3

A Cassette housing assembly

1

(S1)

(L4)

(L1)

(L3)

(L5)

2

(S1)

(L2)

1 Drum assembly

3

(S2)

4

(S2)

5

(S2)

S2×3

2 Motor bracket assembly

9

(S2)

8

(S2)

6

(S2)

7

(S2)

S2×4

3 Middle catcher assembly

10

(S2)

12

(S2)

11

(S2)

S2 S2 S2

2-13-4

2-13-6

4 Reel cover assembly

13

(S2)

S2, L6×2

5

Pinch roller arm assembly

(W1)

W1, L7

6 Sub brake assembly

(W1)

S2S1 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S3

S1×2, L1-L5

S2×3

P1, W1, L8

17 Control plate 18 Guide rail (Take up) assembly 19 Guide rail (Sup)

assembly

(

)

L13

21

(S2)

20

(S2)

22

(S2)

23

(S2)

L12×2 S2×4 S2, L13×2

24 Center

gear
assembly

25 Reel drive

pulley
assembly

(W1)

26 Push

plate

(W1)

27 Clutch

lock gear
(2)

(W3)

28 Clutch

lock
gear (1)

(P6)

29 Tension control arm

assembly

(

)

L15

30

(

L16

W1 W1 W3 P6 L15 W1, L16

35 Main cam 36 Arm gear 1 assembly

(W1)

Collar

37

Centering arm assembly

(

)

L18

38 Sub cam

31

(S2)

(P1)

24

(S2)

Brake
control arm
assembly

) (W1)

2-36

W1 COLLAR L18 S2

Fig. 2-15-1A

16 18 19 20 21 32 33 34 38 42

19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34

S2 S2 S2 S2 S2 S2 S2 S2 S2

S2 S2 S2 S2 S2 S2 S2

2-13-7 2-13-9

7 Band arm plate sub

assembly

(P2)

14

(S3)

(W2)

11 Sub deck assembly

S3, P2, L9, W2

8 Tension arm sub

assembly

(P3)

P3

9

EXIT guide arm assembly

(W1)

S2×4

10 Swing arm assembly

16

(S2)

18

(S2)

2-13-14

17

(S2)

12

Main

Brake(Sup)

assembly

(P4)

13

Main

Brake(Take up)

assembly

(P5)

2-13-12 2-13-13 2-13-152-13-8

15

(S2)

P4, L10 P5, L11

14

Reel disk
assembly
(Sup)

15

Reel disk
assembly
(Take up)

16 Prism

19

(S2)

W1

20 Base plate assembly

21 Ent. guide base

22 Worm wheel 2 23 Timing belt

S2

assembly

25

(S2)

26

(S2)

S2, L14×2 S2

31 Charge arm assembly 32 Connect gear 2 33 Connect gear 2 34 Rotaly encoder

assembly

33

(S2)

29

(S2)

32

(S2)

(

L17

)

27

(S2)

L17 S2 S2

39 Arm gear 2 assembly 40 Clutch lock lever

41 Capstan motor 42 Drum base deck

assembly

(

)

L19

28

(S2)

S2×2

ADJUST NUT

(P7)

L19 S2×3ADJUST NUT, P7

30

(S2)

34

(S2)

Fig. 2-15-1B

2-37

2.16 MECHANISM PHASE CHECK/ADJUSTMENT

See Fig. 2-16-1.

Worm Wheel 2

22

See Fig. 2-13-9A.

Rotary Encoder Assembly

34

See Figs. 2-13-9A and
2-13-13A.

35

Main Cam
See Figs. 2-13-13A and 2-13-13B.

Arm Gear 1 Assembly

36

See Fig. 2-13-13B.

Centering Arm Assembly

37

See Fig. 2-13-13B.

Arm Gear 2 Assembly

39

See Fig. 2-13-14A.

Sub Cam

38

See Fig. 2-13-14A.

Clutch Lock Lever Assembly

40

See Fig. 2-13-14A.

2-38

Fig. 2-16-1

2.17 POSITIONING THE TENSION POLE

See Fig. 2-17-1.

Tension Arm Sub
Assembly

B section

C

D section

Fig. 2-17-1

Adjustment Method

Note:

Remove the cassette housing assembly in advance.

•

1. Set the mechanism mode to the PLAY mode. (See pages
2-20 and 21.)

2. Loosen a screw A .

3. Check the location of the tip (section B ) of the tension
arm assembly to make sure that it is within area C .
If it is located outside, turn part D to bring it within the
specified area.

4. Tighten the screw A .

Note :

Tightening torque for the screw A : 0.06 Nm (0.6
kgfcm)

Screw A

2-39

2.18

COMPATIBILITY AND ERROR RATE ADJUSTMENTS

2.18.1 Preparation

Before disassembly and adjustment, back up the data stored
in the EEPROM (IC1007 on the DV MAIN board) using the
Service Support System Software (SSS software).

Table 2-18-1 shows the important service points for the com­patibility and error rate adjustments.

Adjustment Item

Service Point

Drum replacement Required Required Required

Transport part Required Not Check
replacement Note 1

Transport part Required Not Check
(drum) repair Note 1

IC5001
(PRE/REC amp on Not Not Check
PRE/REC MDA
board) replacement

IC2001
(PB. EQ on DV Not Not Required
MAIN board)
replacement

DV MAIN board
replacement Not Required Required
Note 2

Linearity

Adjustment

Note 1

PB Switching

Point Adjustment

Adjustmenmt

Error Rate

Table 2-18-1

Note 1 :

• The linearity adjustment is required only after servicing or
replacing the drum or the take up/supply guide rail.

Note 2 :

•

After replacing the DV MAIN board, write the original data in
the EEPROM of the new board. If write communication is not
possible, mount the original EEPROM on the new board.

When adjustments of more than one item are required, use
the following order for the adjustments.

2.18.3 Linearity Adjustment

∫

2.18.4 PB Switching Point Adjustment

∫

2.18.5 Error Rate Adjustment

2.18.2 Adjustment

The actual adjustment requires the following preparation.

1. Tools required for adjustment

Alignment tape

US : MC-1
PAL : MC-2

Guide driver

YTU94085

Jig connector cable

PTU94018B

2. Procedure

1. Take out the 7 screws (1 to 7), then remove the top cover.
(See Fig. COM1 on page 1-3 of section 1.5.)

2. Connect the jig connector cable to CN1101 on the DV
MAIN board.

Jig Connector Cable

PTU94018B

1

0

1

1

N

C

DV MAIN PWB

<Note> : Switch setting of the

Jig connector cable

Switch OFF

(UP)

Fig. 2-18-2

3. Setup for computer adjustment

– Setup by extending the jig connector –

When performing the adjustment by the SSS software, set the VCR
to external communication mode by transmitting the code “6C” from
the Jig RCU.

Jig RCU
[PTU94023B]

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

Switch

INITIAL MODE

DATA CODE

CUSTOM CODE

43: A CODE
53: B CODE

<JLIP>

PC Cable

QAM0099-002

<Note> : Switch setting of the

Service Support Software

RS-232C Port

Jig connector cable

Switch OFF

JVC

MENU

Personal Computer

(UP)

2-40

SSS software

PTU94016-3

PC cable
US : QAM0099-002
PAL : QAM0099-005

Fig. 2-18-1

Jig RCU

PTU94023B

DV MAIN PWB

CN1101

Fig. 2-18-3

2.18.3 Linearity adjustment

The “PB Switching Point” in the Adjustment Utility of
the SSS software is adjusted automatically.

Load the alignment tape.

The following flowchart shows the linearity check/adjustment
procedure.

Connect an oscilloscope (CH: + Slope) and, while triggering
it with the HID signal, observe the ENV OUT waveform.

Play the alignment tape, then set “ATF” (Auto Tracking
Find) in “Deck Controller” of the SSS Software to ON.
(Note 3)

2.18.4 PB switching point adjustment

The following flowchart shows the PB switching point adjust­ment procedure.

Ensure that the ENV OUT waveform is linear and parallel,
without a noticeable drop or variation in the overall level. If
the waveform linearity is poor or there is a noticeable drop
in level, adjust the guide roller by turning it with the roller
driver.

Set “ATF” (Auto Tracking Find) to OFF using “Deck
Controller” of the SSS Software (Note 4). Observe the ENV
OUT waveform to confirm that the overall waveform
balance and linearity levels vary in accordance with the
tracking variation as shown in Fig. 2-18-3.

Repeat above steps
as required.

No

The linearity adjustment is complete if the PB ENV
waveform is ideally stable and varies ideally according to
the tracking variation. To close, play a prerecorded tape and
check the audio and video.

Is the PB ENV waveform ideally
stable and does it vary ideally
according to the tracking variation?

Yes

2.18.5 Error rate adjustment

The following flowchart shows the error rate adjustment pro­cedure.

Record a color bar signal for about 5 minute s. (Note 6)

While playing the recorded signal, adjust “

” or “

Frequency (ME SP)
“Deck Section” of the Adjustment Utility.

To adjust VCO Center Frequency (ME SP) : Set Viterbi OFF.

To adjust VCO Center Frequency (ME LP) : Set Viterbi ON.

No

Is the obtained error rate minimum
(almost the typical value)?

VCO Center Frequency (ME LP)

VCO Center

” in

Yes

The error rate adjustment is complete when the minimum
error rate which is no higher than the typical value is
obtained. (Note 5)

HID waveform

PB ENV
waveform

Fig. 2-18-4 PB ENV Waveform

Note 3 :

• The VHS section has an A/C head, and the first tracking
position can be locked using the CTL pulse and drum FF
when AT is off. Therefore, the linearity of the VHS section
can usually be adjusted with AT off. However, this adjust­ment method is not available with the DV section, which
does not have the A/C head. If ATF is turned off, the DV
section performs tracking only of the speed system. There­fore, as time passes, the servo will be lost and the linearity
adjustment will become difficult.

Note 4 :

• Since the speed servo function is active when ATF is off,
there will be no problem even if the DVC ATF function is
off, provided that it is for a few minutes.

CH1

CH2

Adjust variation
in the parallelism

Note 5 :

• The “typical value” refers to the following:
CH1 or CH2: < 498.; with Viterbi OFF. Inter-channel differ­ence: < 10 times between CH1 and CH2.

Note 6 :

• It is desirable to use a brand-new tape or an unused sec­tion of tape. This is to assure the adjustment reliability be­cause using a damaged tape increases the error rate.

2.18.6 Error rate measuring method

It is not necessary to use the error rate jig (YTU93083) or a
frequency counter. The Service Support System Software
displays the error rates of video CH1, CH2 and totals. When
measuring the error rate of a channel, be sure to total the
values of the video and the audio errors.

2-41

2.19 TAPE EJECTION

If a loaded cassette tape cannot be ejected due to a failure
in the electrical circuitry, take the cassette tape out using the
following procedure.
However, this method consists of a forced driving of the load­ing motor. Therefore, the following description assumes that
there is no trouble in the mechanism operations.

1. Unplug the power plug from the power outlet, then re­move the top cover.

2. Apply 3 V DC to the electrodes (Red wire: + pole. Brown
wire: - pole) on the upper part of the loading motor to per­form the unloading operation so that the pole base as­semblies are returned on the inner side of the tape. At
this time, the exit guide arm assembly should return to­ward the drum assembly and the mechanism should en­ter the C-IN mode.
As the tape is left without winding, be careful not to dam­age the tape or leave grease on it.

–

DC 3 V

+

Motor Bracket Assembly (Loading Motor)

Wire (Brown)

3. If the tape is slack, wind it up by turning the shaft on the
topside of the capstan motor in the direction of the arrow
using a pointed tool (chip IC replacement jig).
This operation may be difficult because the shaft is lo­cated below the housing motor of the cassette housing
assembly. Be careful not to damage parts during it.

4. After confirming that the tape is fully wound up, take out
the cassette tape by turning the gear of the cassette hous­ing assembly in the direction of the arrow.

Note :

• After ejecting the tape, check that grease or similar for-

eign material is not attached to the wound tape. Also
perform similar checking for the mechanism assembly,
particularly the tape transport system.

Exit Guide Arm Assembly

Cassette Housing Motor

Wire (Red)

Pole Base Assembly (Supply)

Rotary Encoder Assembly

[3] Tape winding [4] Tape ejection

Capstan motor Cassette housing assembly, side view

A B

Chip IC replacement jig

Shaft

A

Pole Base Assembly (Take-Up)

B

Cassette Housing Assembly

Gear

2-42

Capstan motor

Ejection direction

Fig. 2-19-1

SECTION 3

ELECTRICAL ADJUSTMENT (VHS)

3.1 PRECAUTION

The following adjustment procedures are not only necessary
after replacement of consumable mechanical parts or board
assemblies, but are also provided as references to be re­ferred to when servicing the electrical circuitry.
In case of trouble with the electrical circuitry, always begin a
service by identifying the defective points by using the meas­uring instruments as described in the following electrical ad­justment procedures. After this, proceed to the repair, replace­ment and/or adjustment. If the required measuring instruments
are not available in the field, do not change the adjustment
parts (variable resistor, etc.) carelessly.

3.1.1 Required test equipments

• Color (colour) television or monitor

• Oscilloscope: wide-band, dual-trace, triggered delayed
sweep

• Frequency counter

• Signal generator: RF / IF sweep / marker

• Signal generator: stairstep, color (colour) bar [PAL]

• Recording tape

• Digit-key remote controller(provided)

3.1.2 Required adjustment tools

Jig RCU

PTU94023B

Alignment tape

(SP, stairstep, PAL)

MHPE

Alignment tape

(LP, stairstep, PAL)

MHPE-L

Jig RCU

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

CUSTOM CODE
43: A CODE
53: B CODE

DATA CODE

INITIAL MODE

Fig. 3-1-4a Jig RCU [PTU94023B]

• Set the switches as shown below unless otherwise
specified on the relevant adjustment chart. The
switches that are not listed below can be set as de­sired.
If the VCR is not equipped with the functions detailed
below, setup is not required.

AUTO PICTURE/VIDEO CALIBRATION/
B.E.S.T./D.S.P.C.

PICTURE CONTROL/SMART PICTURE

VIDEO STABILIZER OFF

TBC ON

Digital 3R ON

VIDEO NAVIGATION/TAPE MANAGER

OFF

NORMAL/NATURAL

OFF

• Unless otherwise specified, all measuring points and
adjustment parts are located on the Main board.

• In the Signal column of the adjustment chart, “Ext. S­input” means the Y/C separated video signal and “Ext.
input” means the composite video signal input.

Burst

LPF

PTU93006

0.3 V

Alignment tape

(S-VHS, SP/LP, color (colour) bar)

s

Colour bar pattern [PAL]

(75%)

White

U Black

V

Yellow

Cyan

White
100%

MH-2H

Green

Magenta

Red

Blue

Alignment tape

(SP stairstep, NTSC)

MHP

3.1.3

Color (colour) bar signal,Color (colour) bar pattern

s

Colour bar signal [PAL]

White(100%)

White(75%)

0.7 V

1V

0.3 V

Horizontal sync

Yellow

Cyan

Green

Magenta

Red

VU

V(R-Y)
U(B-Y)

Blue

3.1.4 Switch settings and standard precautions

The SW settings of the VCR and the standard precautions
for the electrical adjustments are as follows.

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

3.1.5 EVR Adjustment

Some of the electrical adjustments require the adjustment
performed by the EVR system. The Main board assembly
have EEPROMs for storing the EVR adjustment data and
user setups.

Notes:

• In the EVR adjustment mode, the value is varied with
the channel buttons (+, –). The adjusted data is stored
when the setting mode changes (from PB to STOP,
when the tape speed is changed, etc.). Take care to
identify the current mode of each adjustment item
when making an adjustment.

• When changing the address setting in the EVR adjust­ment mode, use the Jig RCU or the remote controller
having numeric keypad with which a numeric code can
be directly input.
The remote control code of the Jig RCU corresponds
to each of the digit keys on the remote controller as
follows.

Digit-key 0 1 2 3 4 5 6 7 8 9

Code 20 21 22 23 24 25 26 27 28 29

• As the counter indication and remaining tape indica­tion are not displayed FDP during the EVR adjustment
mode, check them on the TV monitor screen.

• When performing the EVR adjustment, confirm that the
FDP indication is changed to the EVR mode, as shown
below.

3-1

FDP

Fig. 3-1-5a EVR mode

3.2 SERVO CIRCUIT

3.2.1 Switching point

Signal (A1) • Stairstep signal

Mode (B) • PB

(A2)
(A3) •

•

Alignment tape(SP, stairstep, PAL) [MHPE]
Alignment tape(SP, stairstep, NTSC) [MHP]

• TBC: OFF

Equipment (C) • Oscilloscope
Measuring point (D1) •

(D2) • TP106 (PB FM)
External trigger (E) • TP111 (D.FF)/slope : –
Adjustment part (F) • Jig RCU: Code “51” or “52”
Specified value (G) • 8.0 ± 0.5H [MHPE]

VIDEO OUT terminal (75Ø terminated)

• 7.5 ± 0.5H [MHP]

Adjustment tool (H) • Jig RCU [PTU94023B]

(1) Play back the signal (A1) of the alignment tape (A2).
(2) Apply the external trigger signal to D.FF (E) to observe

the VIDEO OUT waveform and V.PB FM waveform at the
measuring points (D1) and (D2).

(3) Press the channel buttons (+, –) simultaneously to enter

the manual tracking mode. This also brings tracking to
the center (centre).

(4) Adjust tracking by pressing the channel buttons (+, –) so

that the V.PB FM waveform becomes maximum.

(5) Transmit the code (F) from the Jig RCU to adjust so that

the trigger point of the VIDEO OUT waveform is changed
from the trailing edge of the V.sync signal becomes the

specified value (G).
(6) Set the VCR to the stop mode or eject mode.
(7) Play back the signal (A1) of the alignment tape (A3).
(8) Repeat steps (2) to (6).

Trigger point

Switching point

V.sync

(1) Record the signal (A2) in the mode (B1), and play back

the recorded signal.

(2) Press the channel buttons (+, –) simultaneously to enter

the manual tracking mode. This also brings tracking to

the center (centre).
(3) Set the VCR to the FWD slow (+1/6×) mode.
(4) Transmit the code (F) from the Jig RCU to adjust so that

the noise bar becomes the specified value (G) on the TV

monitor in the slow mode.
(5) Set the VCR to the Stop mode.
(6) Confirm that the noise bar is (G) on the TV monitor in

the slow mode.
(7) Repeat steps (3) to (6) in the REV slow (–1/6×) mode.
(8) Repeat steps (1) to (7) in the mode (B2).

Note:

• For FWD slow (+1/6×) playback, transmit the code “08”

from the Jig RCU to enter the slow playback mode, and
transmit the code “D0” for REV slow (–1/6×) mode.

3.3 VIDEO CIRCUIT

3.3.1 D/A level

Signal (A1) • Ext. S-input / Ext. input

Mode (B) • S-VHS

(A2) • Color (colour) bar signal [PAL]
(A3) • S-VHS tape

• EE

Equipment (C) • Oscilloscope
Measuring point (D) •
Adjustment part (F) • VR1401 (D/A LEVEL ADJ)

Specified value (G) • 1.00 ± 0.015 Vp-p (reference value)
(Note)

(1) Insert the cassette tape (A3) to enter the mode (B).
(2) Observe the Y OUT waveform at the measuring point (D).
(3) Check the Y level value when the External S-input (Y/C

separated video signal).
(4) Switch the input signal to the External input (composite

video signal), and adjust the adjustment part (F) so that

the Y level becomes the same value observed in step

(3).

Note:

• The specified value (G) is just a reference value to be

obtained when the External S-Video (Y/C separated
video) signal is input. In actual adjustment, set it to
the value observed in step (3).

Y OUT terminal (75Ø terminated)

[3D DIGITAL/2M board]

Fig. 3-2-1a Switching point

3.2.2 Slow tracking preset

Signal (A1) • Ext. input

(A2) • Color (colour) bar signal [PAL]

Mode (B1) • S-VHS SP

(B2) • S-VHS LP
Measuring point (D) • TV-Monitor
Adjustment part (F) • Jig RCU: Code “71“ or “72”
Specified value (G) • Minimum noise
Adjustment tool (H) • Jig RCU [PTU94023B]

3-2

V. rate

Specified
value (G)

H. rate

Fig. 3-3-1a D/A level

1 kØ 39 µH 180 µH

120 pF 180 pF

PB. FM

629 [kHz]
PB COLOR
(PB COLOUR)

3.3.2 EE Y level

Signal (A1) • Ext. input

Mode (B) • EE
Equipment (C) • Oscilloscope
Measuring point (D) • Y OUT terminal (75Ø terminated)

EVR mode (F1)
EVR address (F2) •

Specified value (G) • 1.00 ± 0.03 Vp-p
Adjustment tool (H) • Jig RCU [PTU94023B]

(1) Observe the Y OUT waveform at the measuring point (D).
(2) Set the VCR to the EVR mode by transmitting the code

(F1) from the Jig RCU.

(3) Set the EVR address to (F2) by pressing the button of

the digit-key remote controller.

(4) Adjust with the channel buttons (+, –) on the VCR (or on

the remote controller) so that the Y level of the Y OUT
waveform becomes the specified value (G).

(5) Release the EVR mode of the VCR by transmitting the

code (F1) from the Jig RCU again. (When the EVR mode
is released, the adjusted data is memorized.)

3.3.3 PB Y level (S-VHS / VHS)

Signal (A1) • Ext. input

Mode (B1) • S-VHS SP

Equipment (C) • Oscilloscope
Measuring point (D) • Y OUT terminal (75Ø terminated)
EVR mode (F1) • Jig RCU: Code “57”

EVR address (F2) • A:11 (Press remote controller

Specified value (G) • 1.00 ± 0.03 Vp-p
Adjustment tool (H) • Jig RCU [PTU94023B]

(1) Observe the Y OUT waveform at the measuring point (D).
(2) Record the signal (A2) in the mode (B1), and play back

the recorded signal.

(3) Press the channel buttons (+, –) simultaneously to enter

the manual tracking mode. This also brings tracking to
the center (centre).

(4) Set the VCR to the EVR mode by transmitting the code

(F1) from the Jig RCU.

(5) Set the EVR address to (F2) by pressing the button of

the digit-key remote controller.

(6) Adjust with the channel buttons (+, –) on the VCR (or on

the remote controller) so that the Y level of the Y OUT
waveform becomes the specified value (G).

(A2) • Color (colour) bar signal [PAL]

• Jig RCU: Code “57”

A:11 (Press remote controller “1” key twice)

• Digit-key remote controller

Specified
value (G)

H. rate

Fig. 3-3-2a EE Y level

(A2) • Color (colour) bar signal [PAL]

(B2) • VHS SP

“1” key twice)

• Digit-key remote controller

(7) Release the EVR mode of the VCR by transmitting the

code (F1) from the Jig RCU again. (When the EVR mode
is released, the adjusted data is memorized.)

(8) Repeat steps (2) to (7) in the mode (B2).

Specified
value (G)

H. rate

Fig. 3-3-3a PB Y level

3.3.4 REC color (colour) level

Signal (A1) •

(A2) • Ext. input
(A3) • Color (colour) bar signal [PAL]

Mode (B1) • S-VHS SP

(B2) • S-VHS LP
Equipment (C) • Oscilloscope
Measuring point (D1) • TP106 (PB FM)

(D2) • PB color (colour) output of the LPF
External trigger (E) • TP111 (D.FF)
EVR mode (F1) • Jig RCU: Code “57”

EVR address (F2) • A:02 (Press remote controller

Specified value (G) • SP: “B” x 125 ± 5%

Alignment tape(S-VHS, SP/LP, Color(colour)
bar) [MH-2H]

“0” and “2” keys)

• LP: “B” x 125 ± 5%

Adjustment tool (H1) • Jig RCU [PTU94023B]

(1)

Connect the adjustment tool (H3) to the measuring point (D1).

(2)

Apply the external trigger signal to D.FF (E) to observe the
PB color (colour) waveform at the measuring point (D2).

(3) Play back the signal (A3) in the mode (B1) of the align-

ment tape (A1).

(4) Press the channel buttons (+, –) simultaneously to enter

the manual tracking mode. This also brings tracking to
the center (centre).

(5) Adjust tracking by pressing the channel buttons (+, –) so

that the PB color (colour) waveform becomes maximum.
Make a note of the higher PB color (colour) level as “B”
at this time.

(6) Record the signal (A3) in the mode (B1), and play back

the recorded signal.

(7) Set the VCR to the EVR mode by transmitting the code

(F1) from the Jig RCU.

(8) Set the EVR address to (F2) by pressing the button of

the digit-key remote controller.

(H2) • Digit-key remote controller

(H3) • LPF [PTU93006] (See Fig. 3-3-4a.)

Fig. 3-3-4a LPF

3-3

(9) Adjust with the channel buttons (+, –) on the VCR (or on

the remote controller) so that the higher level channel be­comes the specified value (G) of the note "B" level as
shown in Fig. 3-3-4b. (Adjust before recording, then con­firm it by playing back.)

(10)

After adjustment, record the signal (A3) then playing it
back again. At this time, confirm that there is no invert­ing phenomenon or noise appearing on the playback
screen.

(11)

Release the EVR mode of the VCR by transmitting the
code (F1) from the Jig RCU again. (When the EVR mode
is released, the adjusted data is memorized.)

(12)

Repeat steps (3) to (11) in the mode (B2).

Note:

• After adjusting, always perform the confirmation and
re-adjustment of the item 3.4.1.

Specified
value (G)

V. rate

Fig. 3-3-4b REC color (colour) level

3.3.5 Video EQ (Frequency response)

Signal (A1) • Ext. S-input

Mode (B1) • S-VHS SP

Equipment (C) • Oscilloscope
Measuring point (D1) • Y OUT terminal (75Ø terminated)

Frequency marker(D2) • 3 [MHz]
External trigger (E) • TP111 (D.FF)
EVR mode (F1) • Jig RCU: Code “57”

EVR address (F2) • A:03 (Press remote controller

Specified value (G) • SP: 3.6 ± 0.4 div. (–1 ± 1 dB)

(A2) • Video sweep signal

(B2) • S-VHS LP
(B3) • Picture Control / Smart Picture

REC : Normal / Natural
PB : Edit / Distinct

“0” and “3” keys)

• LP: 3.2 ± 0.4 div. (–2 ± 1 dB)

Adjustment tool (H) • Jig RCU [PTU94023B]

• Digit-key remote controller

(1) Apply the external trigger signal to D.FF (E) to observe

the Y OUT waveform at the measuring point (D1).

(2) Record the signal (A2) in the mode (B1), and play back

the recorded signal.

(3) Press the channel buttons (+, –) simultaneously to enter

the manual tracking mode. This also brings tracking to
the center (centre).

(4) Set the VCR to the EVR mode by transmitting the code

(F1) from the Jig RCU.

(5) Set the EVR address to (F2) by pressing the button of

the digit-key remote controller.

(6) Set the slope of the oscilloscope to the channel having

higher (D2) marker level of the Y OUT waveform [signal
(A2)]. Then set the 100 kHz marker level to the “4” scale
on the oscilloscope. In this condition, adjust with the chan­nel buttons (+, –) on the VCR (or on the remote control­ler) so that the (D2) marker level reaches the specified
value (G).

3-4

(7) Release the EVR mode of the VCR by transmitting the

code (F1) from the Jig RCU again. (When the EVR mode
is released, the adjusted data is memorized.)

(8) Repeat steps (2) to (7) in the mode (B2).

Scale 4
(4 div.)

Specified
value (G)

Four scale

100 kHz

1 MHz

2 MHz

Frequency
marker (D2)

5 MHz

V. rate

Fig. 3-3-5a Video EQ (Frequency Response)

3.3.6 AUTO PICTURE initial setting

Signal (A1) • Ext. input

Mode (B) •
Adjustment part (F) • Jig RCU : Code “58”
Specified value (G) • STOP mode
Adjustment tool (H) • Jig RCU [PTU94023B]

(A2)

• Video: Optional

(A3) • VHS tape

EE ¥ Auto adjust (SP/LP REC ¥ PB)

(1) Insert the cassette tape (A3).
(2) Set the VCR to the Auto adjust mode by transmitting the

code (F) from the Jig RCU. When the VCR enters the
stop mode, the adjustment is completed. When the VCR
enters the eject mode, repeat steps (1) to (2) again.

3.3.7 DV EE Y level

Signal (A1) • Ext. input

Mode (B) • VHS

Equipment (C) • Oscilloscope

Measuring point (D) •

Adjustment part (F) • VR701 (DV AGC)

Specified value (G) • 1.02 ± 0.02 Vp-p

(A2) • Color (colour) bar signal [PAL]

• EE

TP701 (DV AGC)

(1) Observe the VIDEO OUT waveform at the measuring

point (D).

(2) Adjust the adjustment part (F) so that the Y level of the

VIDEO OUT waveform becomes the specified value (G).

Note:

•

After adjusting, always perform the confirmation and
re-adjustment of the Electrical adjustment (DV).

Specified
value (G)

H. rate

Fig. 3-3-7a DV EE Y level

3.4 AUDIO CIRCUIT

Notes:

• This adjustment should be done after the “REC color
(colour) level adjustment” for the video circuit has
been completed.

• GND (Ground) should be taken from the Tuner shield
case.

3.4.1 Audio REC FM

Signal (A1) • Ext. input

Mode (B) • S-VHS LP
Equipment (C) • Oscilloscope
Measuring point (D) • TP2253 (A. PB FM)
External trigger (E) • TP111 (D.FF)
EVR mode (F1) • Jig RCU: Code “57”

EVR address (F2) • A: 30 (Press remote controller “3”

Specified value (G1) • 450 ± 100 mVp-p

Adjustment tool (H) • Jig RCU [PTU94023B]

• Audio: No signal

(A2)
(A3) •

(G2) • More than 300 mVp-p

Video: Color (colour) bar signal [PAL]

and “0” keys.)

• Digit-key remote controller

(1) Apply the external trigger signal to D.FF (E) to observe

the Audio PB FM waveform at the measuring point (D).

(2) Record the signal (A3) with no audio signal input in the

mode (B), and play back the recorded signal.

(3) Press the channel buttons (+, –) simultaneously to enter

the manual tracking mode. This also brings tracking to
the center (centre).

(4) If the A.PB FM level is not within the specified value (G1),

perform the adjustment in a following procedure.

(5) Set the VCR to the EVR mode by transmitting the code

(F1) from the Jig RCU.

(6) Set the EVR address to (F2) by pressing the button of

the digit-key remote controller.

(7) Adjust with the channel buttons (+, –) on the VCR (or on

the remote controller) so that the A.PB FM level of the
higher channel level becomes the specified value (G1).
(Adjust before recording, then confirm it by playing back.)

(8) If the specified value (G1) is not obtained, adjust with the

channel buttons (+, –) so that the waveform level of the
lower channel level becomes the specified value (G2).
(Adjust before recording, then confirm it by playing back.)

(9) Release the EVR mode of the VCR by transmitting the

code (F1) from the Jig RCU again. (When the EVR mode
is released, the adjusted data is memorized.)

3.5 SYSCON CIRCUIT [HR-DVS2EU]

Note:

•

When perform this adjustment, remove the Mechanism
assembly.

3.5.1 Timer clock

Signal (A) • No signal

Mode (B) • EE

Equipment (C) • Frequency counter

Measuring point (D1) • IC3001 pin 61
Short point (D2) • IC3001 pin 24

Adjustment part (F) • C3025 (TIMER CLOCK)

Specified value (G) • 1024.008 ± 0.001 Hz

(D3) • C3026 + and –

(976.5549 ± 0.0010 µsec)

(1) Connect the frequency counter to the measuring point

(D1).

(2) Connect the short wire between the short point (D2) and

Vcc (5V).

(3) Short the leads of capacitor (D3) once in order to reset

the microprocessor of the SYSCON.

(4) Disconnect the short wire between the short point (D2)

and Vcc then connect it again.

(5) Adjust the Adjustment part (F) so that the output fre-

quency becomes the specified value (G).

Specified
value (G2)

V. rate

Fig. 3-4-1a Audio REC FM

Specified
value (G1)

3-5

ELECTRICAL ADJUSTMENT (DV)

3.6 PREPARATION

3.6.1 Precautions

(1) The DV section of this model is based on a special ad-

justment method using a PC. However, ordinary adjust­ment is required only when the part listed below has been
replaced. In this case, the adjustment should be per­formed by a service center equipped with the required
facilities.

2

PROM (IC1007 on DV main board)

• E

In case of trouble with the electrical circuitry, First iden­tify the faulty position with a measuring tool as described
below. Proceed to repair, replacement and/or adjustment
only after the troubleshooting.

(2) When observing a chip TP, use an IC clip or similar tool

to protect the chip against stress. When replacing a chip
part (IC, particularly), remove solder completely before
replacing. (This is to prevent separation of the pattern.)

(3) The connectors are fragile. Be careful when plugging or

unplugging a wire.

3.6.2 Equipment required for adjustment

1 Personal computer (Windows compatible)
2 Color monitor
3 Oscilloscope (2-CH, 100 MHz or more)
4 Frequency counter

3.6.4 Setup

1. Setup for computer adjustment

— Setup by extending the jig connector —

When performing the adjustment by the Service Support Software,
set the VCR to external communication mode by transmitting the code
“6C” from the Jig RCU.

Jig RCU
[PTU94023B]

INITIAL MODE

DATA CODE

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

Switch

1101

N

DV MAIN PWB

C

<JLIP>

CUSTOM CODE

43: A CODE
53: B CODE

PC Cable

QAM0099-002

<Note> : Switch setting of the

Service Support Software

RS-232C Port

Personal Computer

Jig connector cable

Switch OFF

(UP)

JVC

MENU

3.6.3 Tools required for adjustments

Alignment tape

US : MC-1
PAL : MC-2

PC cable
US : QAM0099-002
PAL : QAM0099-005

Jig connector cable

PTU94018B

Jig RCU

PTU94023B

Fig. 3-6-3a

SSS software

PTU94016-3

Fig. 3-6-4a Setup for Computer Adjustment

3-6