JVC SR-VS30E/EK Service Manual

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SERVICE MANUAL

Mini DV/S-VHS VIDEO CASSETTE RECORDER

SR-VS30E/EK

VHSDV

CABLE/SAT

– –:– –

LCD PROG

AUDIO

TV/VCR

123

456

DAILY/QTDN.

VPS/PDC

WEEKLY/HEBDO

789

0000

AUX

ENTER/ENTREE

PROG

SEC

START

STOP

DATE

DEBUT

FIN

EXPRESS

–

PULL-OPEN TIRER-OUVRIR

–

DUB

VHS

COPIE

PR / + PUSH / TURN

VHS

EXPRESS

24H

PULL-OPEN TIRER-OUVRIR

625

SPECIFICATIONS

GENERAL

Power requirement : AC 220 V - 240 Vd, 50 Hz/60 Hz Power consumption

Power on : 31 W Power off : 6.5 W

Temperature

Operating :

Storage : Operating position : Horizontal only Dimensions (WxHxD)

Weight : 5.1 kg Input/Output : 21-pin SCART connectors:

VHS DECK VIDEO/AUDIO

Signal system : PAL-type colour signal and CCIR

Recording system : DA4 (Double Azimuth) head helical

Format : S-VHS/VHS PAL standard Signal-to-noise ratio: 45 dB Horizontal resolution

(SP/LP) : 250 lines (VHS)

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

Maximum recording time

(SP) : 240 min. with E-240 video cassette

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

5°C to 40°C –20°C to 60°C

: 435 mm x 106 mm x 380 mm

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)

monochrome signal, 625 lines 50 fields

scan system

400 lines (S-VHS)

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

(The specifications shown pertain specifically to the model SR-VS30E.)

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

(SP) : 80 min. with M-DV80ME cassette (LP) : 120 min. with M-DV80ME cassette

Audio recording system

TUNER/TIMER

TV channel storage capacity

Tuning system : Frequency synthesized tuner Channel coverage : VHF 47 MHz

Memory backup time

ACCESSORIES

Provided accessories

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

50 fields

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

32 kHz, 12 bit (4 ch)

: 99 positions (+AUX position)

104 MHz 302 MHz

–

300 MHz/

–

470 MHz

UHF 470 MHz

: Approx. 10 min.

: RF cable,

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

–

89 MHz/

–

862 MHz

SR-VS30E/EK V14SD1

This service manual is printed on 100% recycled paper.

No.82910

March 2002

Section Title Page Section Title Page

Important Safety Precautions INSTRUCTIONS

1. DISASSEMBLY

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

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

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

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

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

1.4.1 Disassembly flow chart ................................................................1-2

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

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

1.5.1 Disassembly flow chart ................................................................1-4

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

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

1.6.1 Disassembly flow chart ................................................................1-6

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

1.7 CONNECTION ..................................................................................1-8

1.8 SERVICE POSITIONS.................................................................... 1-10

1.8.1 Requirement PATCH CORDS....................................................1-10

1.8.2 Service position <VHS SIDE>.................................................... 1-10

1.8.3 Service position <DV FOIL SIDE> .............................................1-10

1.8.4 Service position <DV COMPONENT SIDE>.............................. 1-1 1

1.9 Jig RCU mode................................................................................. 1-11

1.9.1 Setting the Jig RCU mode ......................................................... 1-11

1.9.2 Setting the User RCU mode ...................................................... 1-11

1.10 MECHANISM SERVICE MODE ................................................... 1-12

1.10.1 How to set the “MECHANISM SERVICE MODE” .................... 1-12

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

2.2.12 Change Lever Assembly, Direct Gear, Clutch Gear

and Coupling Gear.................................................................... 2-10

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

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

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

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

and Loading Arm Gear Shaft .................................................... 2-12

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

2.2.17

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)

2.4 PREPARATION...............................................................................2-20

2.4.1 Precautions ................................................................................ 2-20

2.4.2 Tools Required for Adjustments .................................................2-20

2.4.3 Disassembly and Assembly Procedures.................................... 2-20

2.4.4 Screws and Washers Used in Disassembly/

Assembly of the Mechanism Assembly......................................2-20

DISASSEMBLY/ASSEMBLY OF THE MECHANISM ASSEMBLY...................

2.5

2.5.1 Introduction ................................................................................2-21

2.5.2 Mechanism Modes .....................................................................2-21

2.6 MECHANISM TIMING CHART ....................................................... 2-23

MECHANISM ASSEMBLY/DISASSEMBLY PROCEDURE TABLE ..................

2.7

2.8 DISASSEMBLY/ASSEMBLY...........................................................2-26

2.9 LIST OF PROCEDURES FOR DISASSEMBLY ............................. 2-34

2.10 MECHANISM PHASE CHECK/ADJUSTMENT ............................ 2-35

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

2-13

2-17 2-17

2-21

2-24

2.12 POSITIONING THE TENSION POLE........................................... 2-38

COMPATIBILITY AND ERROR RATE ADJUSTMENTS .................

2.13

2.13.1 Preparation ..............................................................................2-39

2.13.2 Adjustment ............................................................................... 2-39

2.13.3 Linearity adjustment .................................................................2-40

2.13.4 PB switching point adjustment ................................................. 2-40

2.13.5 Error rate adjustment ...............................................................2-40

2.13.6 Error rate measuring method ................................................... 2-40

2.14 TAPE EJECTION ..........................................................................2-41

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/PB Y (S-VHS/VHS) level.....................................................3-2

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

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

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

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

3.4 AUDIO CIRCUIT ...............................................................................3-4

3.4.1 Audio REC FM ............................................................................. 3-4

3.5 SYSCON CIRCUIT ...........................................................................3-4

3.5.1 Timer clock................................................................................... 3-4

ELECTRICAL ADJUSTMENT (DV)

3.6 PREPARATION.................................................................................3-5

3.6.1 Precautions .................................................................................. 3-5

3.6.2 Equipment required for adjustment ..............................................3-5

3.6.3 Tools required for adjustments ..................................................... 3-5

3.6.4 Setup............................................................................................ 3-5

4. CHARTS AND DIAGRAMS

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

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

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

4.2 SWITCHING REGULATOR SCHEMATIC DIAGRAM.......................4-5

4.3 MAIN (VIDEO/AUDIO) SCHEMATIC DIAGRAM .............................. 4-7

4.4 MAIN (VHS SYSCON) SCHEMATIC DIAGRAM .............................. 4-9

4.5 MAIN (TUNER) SCHEMATIC DIAGRAM ....................................... 4-11

MAIN (VIDEO I/O & SUB EMPHA) SCHEMATIC DIAGRAM ..................

4.6

4.7 MAIN (AUDIO I/O) SCHEMATIC DIAGRAM...................................4-15

4.8 MAIN (CONNECTION) SCHEMATIC DIAGRAM............................4-17

4.9 3D DIGITAL/2M SCHEMATIC DIAGRAM ....................................... 4-19

4.10 TERMINAL (S-SUB) SCHEMATIC DIAGRAM .............................. 4-21

4.11 TERMINAL (I/O) SCHEMATIC DIAGRAM ....................................4-23

4.12 DEMODULATOR SCHEMATIC DIAGRAM...................................4-25

POWER SW, SW/DISPLAY AND JOG SCHEMATIC DIAGRAMS...................

4.13

4.14 DV MSD SCHEMATIC DIAGRAM ................................................ 4-29

4.15 DV MAIN SCHEMATIC DIAGRAM ............................................... 4-31

4.16 DV I/O SCHEMATIC DIAGRAM ...................................................4-33

4.17 DV V OUT SCHEMATIC DIAGRAM ............................................. 4-35

4.18 DV PRE/REC SCHEMATIC DIAGRAM ........................................ 4-37

4.19 DV REG SCHEMATIC DIAGRAM ................................................4-39

4.20 DV AUDIO AD/DA SCHEMATIC DIAGRAM .................................4-40

4.21 MAIN(ON SCREEN) SCHEMATIC DIAGRAM .............................4-41

4.22 REMOTE CONTROL SCHEMATIC DIAGRAM ............................ 4-42

4.23 SWITCHING REGULATOR CIRCUIT BOARD .............................4-43

4.24 MAIN CIRCUIT BOARD................................................................ 4-45

4.25 3D DIGITAL/2M CIRCUIT BOARD ............................................... 4-48

DEMODULATOR POWER SW, SW/DISPLAY AND JOG CIRCUIT BOARDS ...

4.26

4.27 TERMINAL CIRCUIT BOARD.......................................................4-51

4.28 DV MAIN CIRCUIT BOARD.......................................................... 4-53

4.29 WAVEFORMS ............................................................................... 4-55

4.30 VOLTAGE CHARTS......................................................................4-57

FDP GRID ASSIGNMENT AND ANODE CONNECTION .................

4.31

4.32 CPU PIN FUNCTION ....................................................................4-60

4.33 SYSTEM CONTROL BLOCK DIAGRAM (VHS) ........................... 4-61

4.34 VIDEO BLOCK DIAGRAM(VHS) .................................................. 4-63

4.35 AUDIO BLOCK DIAGRAM (VHS) .................................................4-67

4.36 SYSTEM CONTROL BLOCK DIAGRAM (DV) .............................4-69

4.37 VIDEO BLOCK DIAGRAM (DV) ...................................................4-71

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

MAIN BOARD ASSEMBLY <03> ............................................................5-9

3D DIGITAL/2M BOARD ASSEMBLY <05>..........................................5-17

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

AUDIO CONTROL HEAD BOARD ASSEMBLY <12> ..........................5-20

DEMOD BOARD ASSEMBLY <14>......................................................5-20

POWER SW BOARD ASSEMBLY <27>...............................................5-21

SW/DISPLAY BOARD ASSEMBLY <28> .............................................5-21

DV MAIN BOARD ASSEMBLY <50> ....................................................5-22

LOADING MOTOR BOARD ASSEMBLY <55>.....................................5-27

JOG BOARD ASSEMBLY <85>............................................................5-27

2-39

4-13

4-27

4-49

4-59

The following table lists the differing points between models SR-VS30EK and SR-VS30E.

ITEM

MODEL

SR-VS30EK

SR-VS30E

POWER PLUG 3PIN(CLASS II) CEE(CLASSII) VIDEO SYSTEM PAL/NTSC ON PAL TV PAL/MESECAM(MANUAL)/NTSC ON PAL TV BROADCASTING STANDARD I B/G, D/K STEREO DECODER NICAM NICAM/A2 VCR PLUS+

VIDEO PLUS+ DELUXE

SHOWVIEW DELUXE

LANGUAGE[INITIAL](ON SCREEN DISPLAY) ENGLISH 10 LANGUAGE [E]

Important Safety Precautions

cut close to connector

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 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.

symbol and shaded ( ) parts are

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).

Fig.3

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

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

15 mm

Fig.1

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

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

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

Power cord

Fig.2

10. Also check areas surrounding repaired locations.

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

Fig.4

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

the wires fully into the connector.

Metal sleeve

Connector

Fig.5

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

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

1.25

2.0

5.5

Fig.6

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

Not easily pulled free

Wire insulation recessed

more than 4 mm

Fig.7

Crimping tool

Crimped at approx. center

of metal sleeve

Conductors extended

S40888-01

Chassis

Power cord, primary wire

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

Z V

Fig. 9

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.

AC inlet

Earth pin

AC Line Voltage

100 V

100 to 240 V

110 to 130 V

200 to 240 V

Exposed accessible part

Milli ohm meter

Fig. 10

Region

Japan

USA & Canada

Europe & Australia R 10 MΩ/500 V DC

Region Load Z

Insulation Resistance (R)

≤

R 1 MΩ/500 V DC

≥≥

1 MΩ R 12 MΩ/500 V DC

≤

Table 1 Specifications for each region

Grounding Specifications

Region

USA & Canada

Europe & Australia

Dielectric Strength

AC 1 kV 1 minute

AC 1.5 kV 1 miute

AC 1 kV 1 minute AC 3 kV 1 minute

AC 1.5 kV 1 minute

(Class 2)

(Class 1)

Grounding Impedance (Z)

≤

Z 0.1 ohm

≤

Z 0.5 ohm

Clearance Distance (d), (d')

≤

d, d' 3 mm

≤

d, d' 4 mm

≤

d, d' 3.2 mm

≤

d 4 mm

≤

d' 8 mm (Power cord)

≤

d' 6 mm (Primary wire)

a, b, cLeakage Current (i)AC Line Voltage

100 V

110 to 130 V

220 to 240 V

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

Japan

USA & Canada

Europe & Australia

Table 2 Leakage current specifications for each region

1 kΩ

0.15 µF

1.5 kΩ

2 kΩ

50 kΩ

≤

i 1 mA rms Exposed accessible parts

≤

i 0.5 mA rms

≤

i 0.7 mA peak

≤

i 2 mA dc

≤

i 0.7 mA peak

≤

i 2 mA dc

Exposed accessible parts

Antenna earth terminals

Other terminals

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

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

2. VHS section

1.3 DISCONNECTION OF CONNECTORS (WIRES)

3. DV section

Fig. 1-1-1

1.2 HOW TO READ THE DISASSEMBLY AND ASSEMBLY

Step/

Loc No.

Top cover, Bracket COM1 Front panel

assembly

Fig. No.

COM2 8(L3),

§§ §§ §

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

(1) Order of steps in Procedure

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

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

released, unplugged, unclamped or unsoldered.

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

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

(CN**).

Note:

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

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

(5) Adjustment information for installation

Point NotePart name

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

CN7507(WR1), CN3011(WR2)

—

1-1

1.4

HOW TO REMOVE THE MAJOR PARTS <COM section>

1.4.1 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

(S1a)

[1] Top cover

(S1b)

SW/Display board assembly, Power SW board assembly,

[3]

Jog board assembly

[4] SW REG board assembly

Foot assembly, Foot(center), Foot(rear), Bottom cover

[5]

Disassembly/assembly method <COM section>

1.4.2

Step/

Loc No.

Top cover

[1]

Bracket Front panel

[2]

assembly

SW/Display board assembly

[3]

Power SW board assembly Jog board assembly SW REG board

[4]

assembly

[5]

Foot assembly Foot(center) Foot(rear)

Bottom cover

Fig. No.

4(S1a), 2(S1b)

COM1

2(S1c)

COM2 8(L2a),

CN7510(WR2a), CN3011(WR2b)

COM3 8(S3a)

2(S3b) 2(S3c),Knob(Jog)

COM4 4(S4a),

CN5322(WR4a), CN5321(WR4b), CN5325(WR4c), CN5324(WR4d), CN5323(WR4e)

COM5Lug wire

(S5a) 5(L5a)

4(L5b), 9(L5c), 2(L5d)

Point NotePart name

—

—

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

• When attaching the FPC take care that it is not caught.

• When removing or attaching the WIRE/FPC, refer to "1.7 CONNECTION"(page 1-8) at same time.

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

When attaching the Front panel assembly, be careful not to damage the DV terminals.

When attaching (WR2a) and (WR2b), insert supporting long side to connector in the Main board assembly.

When attaching Jog board assembly, attach it before SW/ Display board assembly.

When removing Bottom cover, remove it after VHS section parts and DV section parts.

<Note 2b> DV SIDE

(L2a)

DV terminals <Note 2c>

(L2a)

(S1c)

[1] Bracket

Fig. COM1

CN3011

(L2a)

(WR2b)

[2] Front panel assembly

Fig. COM2

CN7510

VHS SIDE

(WR2a) <Note 2a, 2d>

(L2a)

(S1a)

1-2

[2] Front panel assembly

Knob (Jog)

[5] Lug wire

(S5a)

(L5a)

(L5d)

(L5a)

(S3a)

(S3c)

(S3a)

(S3c)

(S3a)

[4] SW.REG board assy

[3]

(S3a)

Fig. COM3

(S4a)

Jog board assembly <Note 3a>

SW/Display board assembly

(S3b)

Power SW board assembly

(L5a)

(L5b)

[5] Foot assy

(L5c)

[5] Foot(center)

[5] Foot(rear)

(L5a)

(L5b)

[5] Foot assy

Fig. COM5

(L5c)

(L5b)

[5] Bottom cover

(L5c)

[5] Foot(rear)

CN5324

(WR4d)

(WR4e)

(S4a)

CN5323

(S4a)

Fig. COM4

(S4a)

CN5325

CN5322

CN5321

(WR4c) <Note 2a>

(WR4a) <Note 2a>

(WR4b) <Note 2a>

1-3

1.5

HOW TO REMOVE THE MAJOR PARTS <VHS section>

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. 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 1.4.)

[1] Drum assembly

[2] Mechanism assembly

[3] Main board assembly

1.5.2 DIsassembly/assembly method <VHS section>

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

Step/

Loc No.

Drum assembly

[1]

(Inertia plate) (Roller arm assy) Mechanism

[2]

assembly

Main board

[3] <Note 1b>

assembly

Fig. No.

V3 (S8a), 6(L8a),

Point NotePart name

CN1(WR6a), CON1(WR6b), (S6a), (S6b), (S6c)

4(L6a) (P6a), (L6b) (S7a), (S7b), (S7c),

(S7d), 2(L7a), CN1(WR7a)

CN701(WR8a), CN2601(WR8b), CN3014(WR8c)

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

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

• When removing or attaching the WIRE/FPC, refer to "1.7 CONNECTION"(page 1-8) at same time.

When it is required to remove the screws ((S7a), (S7b), (S7c) and (S7d)) retaining the Mechanism assembly , please refer to the “Procedures for Lowering the Cassette holder assembly”(See on page 1-4).

• 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).

• When reattaching the Mechanism assembly to the Main board assembly, CN2 of LOADING MOTOR BOARD should not be floated.

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

(S6a to S6c) in the order of a, b, c.

Inertia plate

(S6c)

Roller arm assy

(S6a)

(L6a)

(P6a)

(L6b)

[1] Drum assembly

CON1

CN1

(WR6b)

(S6b)

(WR6a)

Cleaner assy

(L6c)

Not used

• 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.

1-4

Fig. V1

Note:

(S8a)

(L8a)

CN2601

CN701

CN3014

[3] Main board

assembly

(WR8a)

(WR8b)

(WR8c)

Make a crease on the position where the dotted line is not exceeded.

A/C head base

(WR7a)

Note: When installing the Mechanism assembly, secure the screws (S7a to S7b) in the order of a, b.

[2] Mechanism assembly

(S7b)

(L7a)

spacer

(S7d)

Q3003

End sensor

D3001

(WR7a) <Note 1b>

CN2

(S7a)

CN1

Q3002

S3002

S3002 S cassette switch <Note 2b>

CN2 <Note 2b>

(S7c)

D3001 LED <Note 2b>

Q3002 Start sensor <Note 2b>

(L7a)

spacer

Fig. V3

Fig. V2

1-5

1.6

HOW TO REMOVE THE MAJOR PARTS <DV section>

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.)

(S9b)

(S9a)

[1] Base(DV)

[2] DV Mechanisam assembly, DV Main board assembly

[3] DV MDA board assembly

1.6.2 Disassembly/assembly method <DV section>

Step/

Loc No.

[1] [2]

[3]

Base(DV) DV Mechanism

assembly

DV Main board assembly

DV MDA board assembly

Fig. No.

D1 3(S9a), (S9b) D2 3(S10a),

D3 2(S11a), 2(S11b),

Point NotePart name

CN1502(WR10a), CN4001(WR10b) CN1501(WR10c)

4(S10b)

2(L11a), CN5503(WR11a), CN5504(WR11b), CN5502(WR11c), CN5505(WR11d), CN5507(WR11e), Bracket(MDA)

<Note 1a> <Note 2a,

2b, 2c>

With due regard to operational considerations, remove the parts located on the Base(DV) (i.e. DV Mechanism assembly, DV MDA board assembly etc.) together before removing the major parts.

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

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

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

• When removing or attaching the WIRE/FPC, refer to "1.7 CONNECTION"(page 1-8) at same time.

Lug wire

(S9b) Lug wire

Base(DV) Bottom chassis

When reattaching (S9b), attach in the order of the above figure.

Fig. D1

[2] Mechanism assembly(DV) <Note 2a>

[1] Base(DV)

[2] DV Main board assembly <Note 2b>

(S10a)

(S10b)

CN1502

(S10a)

(WR10a) <Note 2c>

CN4001

(WR10c) <Note 2c>

(WR10b) <Note 2c>

CN4001

CN1501

1-6

(S10b)

CN1502

(S10b)

Fig. D2

[3] DV MDA board assembly

(S11a)

CN5504

Bracket(DV)

(WR11b) <Note 2c>

(S11b)

(S11a)

(S11b)

NOTE: When removing, remove in order of a number to .

CN5505

CN5503

4 (WR11a) <Note 2c>

CN5507

(L11a)

(WR11d) <Note 2c>

CN5502

(WR11c) <Note 2c>

(WR11e) <Note 2c>

Fig. D3

1-7

1.7 CONNECTION

Treat the wire so as not to come to fan.

right side

CN5323

CN1001

right side

bend

right side

CN5501

DV DRUM

FAN

bend

CN3701

bend

CN5506

back side

CN1501

right side

TERMINAL PWB

Hold wire by stylepin.

ST2

right side

CN502CN901

right side

make a crease

CN1

right side

CN3001

right side

A/C HEAD

bend

back side

DRUM

Should be confirmed that wire not touch to IC of STATOR PWB ASS'Y.

NOTE) Wire the wires as

shown in a figure.

CN1502

CN5502

NOTE) Wire the wires as shown in a figure. NOTE) Put the surplus

wire into this space.

"D"

CN5505

CN5503

CN5507

back side

To SW/Display board

CN7001

NOTE) Twist a wire one time.

To SW/Display board

CN7191

back side

1-8

NOTE) Wire the wires as shown in a figure.

Fig. 1-7-1

DETAIL"A"

Absorb the looseness of the wire in the B part.

CN1

MAIN PWB

WIRING for MECHA ADJ

DRUM

DETAIL"B"

DV MAIN PWB

FINAL WIRING

DV MECHA

CN1502

electrode side

Push into the BOTTOM CHASSIS and treat the wire according to the following figure.

BOTTOM CHASSIS

DETAIL"C"

FRONT PANEL

Absorb the looseness of the wire according to the following figure.

BOTTOM CHASSIS

CN7510

MAIN PWB

CN3011

DETAIL "D"

DV MDA BOARD ASSEMBLY

CN5504

BRACKET(DV)

AC/ HEAD

right side

(WR7a)

AC/ HEAD

right side

After MECHA adjustment, Treat the wire (WR7a) according to the following figure.

Make a crease on the position where the dotted line is not exceeded.

Fig. 1-7-2

Fig

No.

Symbol

Connected point

Connection

Connected point

Pin No.

Type

(FPC/

WIRE)

1 WR2a MAIN CN7510 SW/DISPLAY CN7191 10 FPC 2 WR2b MAIN CN3011 SW/DISPLAY CN7001 20 FPC 3 WR4a MAIN CN7508 SW/REG CN5322 10 FPC 4 WR4b MAIN CN7509 SW/REG CN5321 12 FPC 5 WR4c SW/REG CN5325 FAN MOTOR - 2 WIRE 6 WR4d SW/REG CN5324 DV MDA CN5501 5 WIRE 7 WR4e SW/REG CN5323 DV MAIN CN1001 8 FPC 8 WR6a MAIN CN1 UPPER DRUM - 13 FPC

9 WR6b DRUM MOTOR CON1 MAIN CN3001 5 FPC 10 WR7a A/C HEAD CN1 MAIN CN2001 7 FPC 11 WR8a MAIN CN701 DV MAIN CN3501 14 FPC 12 WR8b MAIN CN2601 DV MAIN CN3701 8 FPC 13 WR8c MAIN CN3014 DV MAIN CN1503 4 FPC 14 WR10c DV MAIN CN1501 DV MDA CN5506 20 FPC 15 - MAIN CN7506 TERMINAL CN502 15 FPC 16 - MAIN CN7507 TERMINAL CN901 9 FPC 17 WR10a SENSOR(DV) - DV MAIN CN1502 15 FPC 18 WR10b PRE/REC(DRUM)(DV) - DV MAIN CN4001 8 FPC 19 WR11a DRUM MOTOR(DV) - DV MDA CN5503 11 FPC 20 WR11e HOUSING MOTOR(DV) - DV MDA CN5507 4 WIRE 21 WR11d ROTARY ENCODER(DV) - DV MDA CN5505 4 WIRE 22 WR11c LOADING MOTOR(DV) - DV MDA CN5502 2 WIRE 23 WR11b CAPSTAN MOTOR(DV) - DV MDA CN5504 18 FPC

Table 1-7-1

1-9

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 FOIL SIDE>

III SERVICE POSITIONS <DV COMPONENT SIDE>

1.8.1 Requirement PATCH CORDS

The following PATCH CORDS is required.

Board to Board Wire Used

1 PTU94022-10 QUQ212-1040CG I 2 PTU94022-20 QUQ112-2040CG I 3 YTU94074-15 QUQ105-1540AA III

Table 1-8-1

1.8.2 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.

< Installation >

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

Regulator side is in the lower position.

Note: • Take care to the fall of the Fan.

(2) Connect FPCs and wires accordingly in Fig. 1-8-1.

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

subjected to stress in this positioning.

(3) Connect the PATCH CORDS to the two FPCs of the Front

panel assembly, then connect the CORDS to the CN7510/CN3011.

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

1.8.3 Service position <DV FOIL SIDE> <Removal>

(1) Remove the top cover and bracket. (2) Remove the front panel assembly. (3) Remove the Base(DV) together with DV Mechanism as-

sembly and DV Main board assembly.

Note:

• Take care not to damage the parts during operating. < Installation >

(1) Place an insulation sheet on the SW/Reg board assem-

bly.

(2) Place a DV section(Base(DV) with DV Mechanism as-

sembly and DV Main board assembly) on the insulation sheet.(refer to Fig. 1-8-2)

Note:

• Confirm that FPCs and wires are not unconnected from the connectors.

DV Mechanism

Insulation Sheet

assembly

DV Main board assembly

CN1502

CN3501

Base(DV)

CN3701

CN1503

Front panel assembly

CN2601

CN701

CN7001

CN3014

CN3011

CN7510

CN7191

Fig. 1-8-2

CN2601

CN7509

Main board assembly

1-10

CN701

CN7508

CN5322

CN3011

CN3014

CN5321

CN7510

Fig. 1-8-1

CN1503 CN3701 CN3501

CN7191

CN7001

Front panel assembly

1.8.4 Service position <DV COMPONENT SIDE> <Removal>

(1) Remove the top cover and bracket. (2) Remove the front panel assembly. (3) Remove the Base(DV) together with DV Mechanism as-

sembly and DV Main board assembly.

(4) Remove the DV Mechanism assembly and DV Main

board assembly from Base(DV).

Note:

• Take care not to damage the parts during operating. < Installation >

(1) Place a DV Main board assembly on the Bottom chas-

sis.

(2) Place an insulation sheet on the rear side of DV Main

board assembly.

(3) Place a DV Mechanism assembly on the insulation sheet.

Note:

• Confirm that DV Mechanism assembly be getting on on the insulation sheet completely.

(4) Connect PATCH CORD to the connector(CN1502) and

connect FPC from DV Mechanism assembly.(refer to Fig. 1-8-3)

(5) Connect other FPCs and wires to the connector that cor-

responds each.(refer to "1-7 CONNECTION") For the PATCH CORD is required, see Table 1-8-1.

Note:

• Confirm that FPCs and wires are not unconnected from the connectors(especially CN4001).

1.9 Jig RCU mode

This unit uses the following two modes for receiving remote control codes.

1) User RCU mode : Ordinary mode for use by the user.

2) Jig RCU mode : Mode for use in production and servicing.

When using the Jig RCU, it is required to set the VCR to the Jig RCU mode (the mode in which codes from the Jig RCU can be received). As both of the above two modes are stored in the EEPROM, it is required to set the VCR back to the User RCU mode each time that an adjustment is made or to check that the necessary operations have been completed. These modes can be set by the operations described below.

1.9.1 Setting the Jig RCU mode

(1) Unplug the power cord plug from the power outlet. (2) Press and hold the “REC” and “PAUSE” buttons on the

VCR simultaneously, while plugging the power cord plug into the power outlet. When the VCR is set to the Jig RCU mode, the symbols ( “ : ” ) in the time display of the FDP are turned off.

1.9.2 Setting the User RCU mode

(1) Turn off the power. (2) Press the “REC” and “PAUSE” buttons of the VCR simul-

taneously. Alternatively, transmit the code “80” from the Jig RCU.

DV Mechanism assembly

Insulation Sheet

CN4001

DV Main board assembly

Front panel assembly

Fig. 1-8-3

CN7001

CN1502

CN3011

CN7510

CN7191

1-11

1.10 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”.

1.10.1 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 1-4 of 1.5 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.

bend

right side

DV MAIN BOARD

ASSEMBLY

SW/REG BOARD

ASSEMBLY

CP5321

CN1001

right side

CN5501

DV DRUM

FAN

right side

CP5322

CN5323

CN3701

bend

back side

CP5325

bend

CN5506

CN2001 (JIG CONN.)

CN1501

TERMINAL BOARD ASSEMBLY

right side

TP701 D YV IN

ST2

right side

MAIN BOARD

ASSEMBLY

DRUM

back side

bend

3D DIGITAL/2M BOARD ASSEMBLY

VR701 D YV IN

CN1

CN502CN901

right side

CP3004

right side

VR1401

right side

make a crease

CN3001

right side

A/C HEAD

DEMOD BOARD ASSEMBLY

right side

CP4001

CP3003

TP111 D.FF

TP4001 CTL. P

TP106 PB. FM

TP2253 A. PB.FM

1-12

DV MDA BOARD

ASSEMBLY

FW7002

DV MECHANISM

ASSEMBLY

POWER SW BOARD

ASSEMBLY

CN1502

FW7001

back side

SW/DISPLAY BOARD ASSEMBLY

Fig. 1-10-1

VHS MECHANISM ASSEMBLY

JOG BOARD

CN7001

CN7191

back side

ASSEMBLY

TPGND TP7001

TEST

1.11 Emergency display function

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

FDP display model [FDP display]

0: 00 : 00

E:**:**

*1: *2 :34 *5: *6 : *7

FDP (7segment LED) display model [FDP display]

0: 00

E: **

1: **

2: *1

3: *2

4: 34

5: *5

6: *6

7: *7

OSD display model [OSD display]

Normal display

EMG content display (E:Latest:Previous)

EMG detail information <1> EMG detail information <2>

Normal display

EMG content display (Latest)

EMG content display (Previous)

EMG detail information <1> [Deck operation mode] EMG detail information <1> [Mechanism operation mode] EMG detail information <1> [Mechanism sensor information and Mechanism mode position] EMG detail information <2> [Type of the cassette tape in use <1>] EMG detail information <2> [Winding position of the cassette tape in use] EMG detail information <2> [Type of the cassette tape in use <2> (Winding area)]

EMG E:**:** *1: *2 : 34

*5: *6 : *7

EMG content display (E:Latest:Previous)

EMG detail information <1> EMG detail information <2>

Notes:

• The EMG detail information <1><2> show the information on the latest EMG. It becomes “ – – : – – : – –” when there is no latest EMG record.

• When using the Jig RCU, it is required to set the VCR to the Jig RCU mode (the mode in which codes from the Jig RCU can be received).

Jig RCU

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

CUSTOM CODE 43: A CODE

DATA CODE

INITIAL MODE

Fig. 1-11a Jig RCU [PTU94023B]

1.11.1 Displaying the EMG information

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

The FDP shows the EMG content in the form of “E:**:**”.

<Example 1> E : 01 : 03

Previous EMG

Latest EMG

<Example 2> E : –– : – –

No EMG record

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

The FDP shows the EMG detail information <1> in the form of “ *1 : *2 : 34 ”.

*1 : Deck operation mode at the moment of EMG *2 : Mechanism operation mode at the moment of EMG 3– : Mechanism sensor information at the moment of

EMG

–4 : Mechanism mode position at the moment of EMG

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

The FDP shows the EMG detail information <2> in the form of “ *5 : *6 : *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)

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

set the display.

Notes:

• For the OSD display model, all EMG information are showed by transmitting first code from the Jig RCU.

• For the EMG content, see “1.7.3 EMG content description”.

• For the EMG detail information <1> , see “1.7.4 EMG detail information <1> ”.

• For the EMG detail information <2> , see “1.7.5 EMG de-

tail information <2>”.

1.11.2 Clearing the EMG history

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

(EMG-02e)

1-13

1.11.3 EMG content description Note: EMG 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

. T he mechanism is locked at the loading end due to the encoder position

reading error during mode transition.

Power is not supplied to the loading MDA.

The mechanism is locked in the middle of mode transition.

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

Power is not supplied to the loading MDA.

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.

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 wind-

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

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

Power is not supplied to the reel sensors.

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.

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.

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

Power is not supplied to the drum MDA.

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

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.

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

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

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.

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.).

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.

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

Power is not supplied to the capstan MDA.

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

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.

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.)

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 cas-

sette 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.

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.

The power to a reel sensor is not supplied.

1-14

Table 1-11-3a

1.11.4 EMG 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 EMG can be confirmed based on the figure in EMG detail information <1> .

[FDP/OSD display]

*1 : *2 : 34

*1 : Deck operation mode at the moment of EMG *2 : Mechanism operation mode at the moment of EMG 3– : Mechanism sensor information at the moment of EMG –4 : Mechanism mode position at the moment of EMG

Note:

• For EMG detailed information <1>, the content of the code that is shown on the FDP (or OSD) differs depending on the parts number of the system control microprocessor (IC3001) of the VCR. The system control microprocessor parts number starts with two letters, refer these to the corresponding table.

*1 : Deck operation mode [Common table of MN*, HD* and M3*]

Display

MN*/M3* HD*

00 - Mechanism being initialized 01 00 STOP with pinch roller pressure off (or tape present with P.OFF) 02 01 STOP with pinch roller pressure on 03 - POWER OFF as a result of EMG 04 04 PLAY 0C 0E REC 10 11 Cassette ejected 20 22 FF 21 - Tape fully loaded, START sensor ON, short FF 22 - Cassette identification FWD SEARCH before transition to FF (SP

24 26 FWD SEARCH (variable speed) including x2-speed 2C 2E INSERT REC 40 43 REW 42 - Cassette identification REV SEARCH before transition to REW (SP

44 47 REV SEARCH (variable speed) 4C 4C AUDIO DUB 6C 6E INSERT REC (VIDEO + AUDIO) 84 84 FWD STILL / SLOW 85 85 REV STILL / SLOW 8C 8F REC PAUSE 8D - Back spacing

8E - Forward spacing (FWD transport mode with BEST function) AC AF INSERT REC PAUSE AD - INSERT REC back spacing CC CD AUDIO DUB PAUSE CD - AUDIO DUB back spacing EC EF INSERT REC (VIDEO + AUDIO) PAUSE ED - INSERT REC (VIDEO + AUDIO) back spacing

x7-speed)

Deck operation mode

*2 : Mechanism operation mode [Common table of MN* and M3*]

Display

MN* M3*

00 00 Command standby (Status without executing command) 02 02 POWER OFF by EMG occurrence 04 04 Moving to the adjacent position in the LOAD direction 06 06 Moving to the adjacent position in the UNLOAD direction 08 08 Cassette ejection being executed / Cassette housing ejection being

- 0A Mode transition to STOP with cassette ejection end 0A 0C Cassette insertion being executed 0C 0E Tape being loaded 0E 10 Tape being unloaded

10 12 Mode transition to STOP with pinch roller compression ON 12 14 Mode transition to STOP with pinch roller compression OFF 14 16

16 18

18 1A Mode transition to PLAY 1A 1C Mode transition to FWD SEARCH 1C 1E Mode transition to REC 1E 20 Mode transition to FWD STILL / SLOW

20 22 Mode transition to REV STILL / SLOW

22 24 Mode transition to REV SEARCH

24 26 Mode transition from FF / REW to STOP

26 28 Mode transition to FF

28 2A Mode transition to REW 2A 2C 4 sec. of REV as a result of END sensor going ON during loading 2C 2E 2E 30 Mechanism position being corrected due to overrun

80 80 Mechanism in initial position (Dummy command)

executed

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

Short FF / REV as a result of END sensor going ON during unloading

Mechanism 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*, HD* and M3*]

Display

MN* / HD* M3* REC safety Start End S-VHS SW CASS SW SW sensor sensor

0- VHS Cassette insertion Tab broken ON ON 1- VHS Cassette insertion Tab broken ON OFF 2- VHS Cassette insertion Tab broken OFF ON 3- VHS Cassette insertion Tab broken OFF OFF 4- VHS Cassette insertion Tab present ON ON 5- VHS Cassette insertion Tab present ON OFF 6- VHS Cassette insertion Tab present OFF ON 7- VHS Cassette insertion Tab present OFF OFF 8- S-VHS Cassette ejection Tab broken ON ON 9- S-VHS Cassette ejection Tab broken ON OFF A- S-VHS Cassette ejection Tab broken OFF ON

B- S-VHS Cassette ejection Tab broken OFF OFF C- S-VHS Cassette ejection Tab present ON ON D- S-VHS Cassette ejection Tab present ON OFF

E- S-VHS Cassette ejection Tab present OFF ON

F- S-VHS Cassette ejection Tab present OFF OFF

Mechanism sensor information

–4 : Mechanism mode position [Common table of MN*, HD* and M3*]

Display Mechanism mode position

MN* HD* M3*

-0 -7 - Initial value

-1 -0 - EJECT position

- - -0 EJECT position (Cassette housing drive mode)

-2 -7 - Housing operating

- - -1 Between EJECT and U / L STOP

-3 -1 -2 U / L STOP position

- - -3 Guide arm drive position

-4 -7 -4 Tape being loaded / unloaded (When the pole base is

-5 -2 -5 Tape being loaded / unloaded (When the pole base is

-6 -7 -6 Pole base compressed position

-7 -3 -F FF / REW position

-8 -7 -F Between FF / REW and STOP with pinch roller compres-

-9 -4 -F STOP with pinch roller compression OFF

-A -7 -E Between STOP with pinch roller compression OFF and

-B -5 - REV (REV STILL / SLOW) position

- - -D REV position

- - -C Between REV and REV STILL / SLOW

- - -B REV STILL / SLOW position

-C -7 - Between REV and FWD

- - -A Between REV STILL / SLOW and FWD STILL / SLOW

-D -6 - FWD (FWD STILL / SLOW) position

- - -9 FWD STILL / SLOW position

-E -7 - Between FWD and PLAY

- - -8 Between FWD STILL / SLOW and PLAY

-F -6 -7 PLAY position

located on the front side of the position just beside the drum)

located on the rear side of the position just beside the drum)

sion ON

REV

Note:

• In the case of the "HD*” microprocessor, as the display is always "-7” at any intermediate position between modes, the position of transitory EMG may sometimes not be located.

1.11.5 EMG 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/OSD display]

*5 : *6 : *7

*5 : Type of the cassette tape in use <1> *6 : Winding position of the cassette tape in use *7 : Type of th

e cassette tape in use

<2>

(Winding area)

Note:

• EMG detail information <2> is the reference information 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

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 or –– ” : 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 C cassette, thick tape TC-20P 0A - 0B Small reel, thick tape T-20 0A - 16 C cassette, thin tape TC-30 0A - 16 C cassette, thin tape TC-40 0D - 0F Small reel, thick tape T-40 11 - 14 Small reel, thick tape T-60 15 - 18 Small reel, thick tape T-80 / DF-160 17 - 1A Small reel, thick tape T-90 / DF-180 19 - 1D Small reel, thick tape T-100 1D - 21 Small reel, thick tape T-120 / DF-240 1E - 1F Small reel, thin tape T-140 1F - 23 Small reel, thick tape T-130 21 - 23 Small reel, thin tape T-160 21 - 23 Small reel, thin tape T-168 22 - 24 Small reel, thick tape DF-300 22 - 24 Small reel, thin tape T-180 / DF-360 22 - 24 Small reel, thin tape T-210 / DF-420 22 - 23 Large reel T-5 23 - 24 Large reel T-10 25 - 26 Large reel T-20 27 - 29 Large reel T-30 29 - 2B Large reel T-40 2D - 2F Large reel T-60

Note:

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

1-16

SECTION 2 MECHANISM ADJUSTMENT (VHS)

2.1 Before starting repair and adjustment

2.1.1 Precautions

(1) Unplug the power cord plug of the VCR 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 reattaching the front panel assembly, make sure

that the door opener of the cassette holder assembly is lowered in position prior to the reinstallation. (See SECTION 1 DISASSEMBLY.)

(6) When using the Jig RCU, it is required to set the VCR to

the Jig RCU mode (the mode in which codes from the Jig RCU can be received). (See SECTION 1 DISASSEMBLY.)

Loading motor

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 SECTION 1 DISASSEMBLY.)

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 cord plug from the power outlet. (2) Refer to the disassembly procedure and perform the dis-

assembly of the major parts before removing the drum assembly.

(3) Unload the pole base assembly by manually turning the

loading motor 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.)

(4) Bring the pole base assembly to a pause when it reaches

the position where it is hidden behind the cassette tape.

(5) 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.)

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

tape and the cassette lid.

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

pletes removal of the cassette tape.

Note:

• For the disassembly procedure of the major parts and details of the precautions to be taken, see “SECTION 1 DISASSEMBLY”.

Pole base assembly

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 SECTION 1 DISASSEMBLY.)

(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(5), 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

Full erase head

T26

Pole base assembly

T25

(supply side)

Tension arm

T24

assembly

T23

Tension brake

T22

assembly

Adjust pin

T5 T7

Drum assembly

Head base

A/C head

Loading motor

Guide pole guard

Pinch roller arm

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

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

Capstan brake assembly

B3 B5

Belt (capstan)

Loading arm gear (take-up side)

Loading arm gear (supply side)

Main brake assembly

T15

(take-up side)

Plate

(supply side)

Control

bracket1

Control plate

Tension arm

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

Opener guide

Door

opener

Drive gear

Cassette housing bracket

Limit gear

Loading motor

Worm gear

Belt (loading motor)

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

2. Cleaning

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

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

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

Note:

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

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

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

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

pletely dry before using the video tape.

3. Lubrication

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

Note:

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

4. Suggested servicing schedule for main components

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

System Parts Name

Upper drum assembly A/C head Lower drum assembly Pinch roller arm assembly Full erase head Tension arm assembly Capstan motor (Shaft) Guide arm assembly Capstan motor Capstan brake assembly Main brake assembly Belt (Capstan) Belt (Loading motor) Loading motor Clutch unit Worm gear Control plate Brush Tension brake assembly

Other Drive Tape transport

Rotary encoder

: Cleaning

: Inspection or replacement if necessary

Operation Hours

~1000H ~2000H

¤R R ¤R ¤R

¤¤R ¤¤ ¤¤ ¤¤ ¤¤ ¤¤

R R R

R R R R R

¤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

2.2.3 Roller cam assembly T 1

2.2.3 Cassette housing bracket T 1

2.2.3 Opener guide T 2

2.2.3 Door opener T 3

2.2.3 Relay gear T 3

2.2.3 Limit gear T 3

2.2.3 Cassette holder assembly T 6

2.2.3 Drive gear T 4

2.2.3 Drive arm T 8

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

2.2.6 A/C head T 1

2.2.7 Loading motor T 1

2.2.8 Capstan motor T/B 1

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 Coupling gear B 5

2.2.12 Clutch gear B 6

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

2.2.15Control bracket1 B 1

2.2.15Control plate B 6

B8 B5

2.2.16Loading arm gear (supply side) B 7

Loading arm gear (take-up side)

2.2.16

2.2.16Loading arm gear shaft B 9

2.2.17Take-up lever T/B 7

B11 B10

2.2.17Take-up head T/B 8

2.2.17Control plate guide T/B 8

2.2.18Capstan 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

Main brake assembly(supply side)

2.2.20

T13

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

T22

2.2.21Tension brake assembly T/B 9

T20

2.2.21Reel disk (supply side) T/B 10

T24

2.2.21Tension arm assembly T/B 10

2.2.21Tension arm bearing T/B 10

T18

2.2.22Idler lever T/B 17

T16

2.2.22Idler arm assembly T/B 18

B19

- Brake lever (

B16

- Rotary encoder guide T/B 19

) 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

T/B 2 T/B 2

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

4 5

5 6

6 7

Cassette holder assembly

Drive gear

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-

Drive arm

Pinch roller arm assembly

Guide arm assembly

Press lever assembly

UV catcher2

Rotary encoder

Clutch unit

Change lever assembly

Direct gear

1 1

1 2 3 4 5

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

Coupling gear

Link lever

Worm gear

Control bracket1

Control plate

Loading arm gear (supply side)

Loading arm gear (take-up side)

1 1

)

(

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

Idler lever

Brake lever

7 7

9 9 9

2-5

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

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

Leg Legs

Fig. 2-2-3c

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

(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.

Cassette holder assembly

Fig. 2-2-3e

Main deck right side

Drive arm

Hole

(C)

Lock lever (R)

(A)

(B)

Drive arm

(C)

Fig. 2-2-3g

Cassette holder assembly

Hole

Drive gear

(1)

(2)

(A)

Fig. 2-2-3f

(B)

Fig. 2-2-3h

2-7

Relay gear

Guide holeNotches Notch

2.2.6 A/C head

1. How to remove

(1) Remove the two screws (A) and remove the A/C head

together with the head base.

(2) When replacing only the A/C head, remove the three

screws (B) while controlling the compression spring.

Head base

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)

A/C head

Fig. 2-2-6a

Screws(B)

A/C head

Compression

A/C 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

A/C 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

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.

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

Slit washer

Washer (*1)

Spacer Direct gear

Spring(A) Position the projecting side down.

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

Coupling gear

Spring (C)

Clutch gear

Spacer

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 coupling gear and catch it from the both sides with the assembly. (See Fig.2-2-12b.)

Rotary encoder guide

Spring(B)

Change lever assembly

Coupling 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 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). Remove the spring attached to the main brake assembly.

(2) (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

(

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), (B) and remove the lug wire. (3) Remove the stator assembly by lifting in the arrow-indi-

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

Notes:

• Be careful not to lose the brush and spring.

• There are some models that do not use the lug wire. Refer to the parts list for these models.

• When tightening the screw (B), place the caulked part of the lug terminal near to the shaft of the drum and then tighten it.

• After installation, be sure to perform the switching point adjustment according to the electrical adjustment procedure.

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

Hook Idler arm

assembly Slit washer

Screw (A)

Stator assembly

Screw (B)

Lug wire (Note)

Drum shaft

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

Lug wire

Screw (A)

Fig. 2-2-23a

2.2.24 Rotor assembly

1. How to remove

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

bly.

2. How to install

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

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

(2) 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.)

Screws (B)

Hole(a)

2-14

Fig. 2-2-22a

Screw holes

Upper drum assembly

Rotor assembly

Fig. 2-2-24a

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

Hole(b)

2.2.25 Upper drum assembly Notes:

• To replace the upper drum assembly only may not be possible with some models. For upper drum assembly replacement, refer to the parts list. (When the parts number of the upper drum assembly is not listed on the parts list, then this cannot be replaced.)

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

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

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.

Lower drum assembly

Coil parts

Upper drum assembly

Fig. 2-2-25b

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.) (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 fol-

lowing adjustments.

• PB switching point adjustment

• Slow tracking adjustment

• Compatibility adjustment (Be sure to check for compatibility for the EP (or LP) mode.)

Upper drum assembly

Collar assembly

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 A/C 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, it is required to set the VCR to the Jig RCU mode (the mode in which codes from the Jig RCU can be received). (See SECTION 1 DISASSEMBLY.)

Jig RCU [Data transmitting method]

Depress the “ ” ( 3 ) button after the data code is set.

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

DATA CODE

INITIAL MODE

Fig. 2-3a Jig RCU [PTU94023B]

2.3.1 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)

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

• Roller driver [PTU94002]

(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) Set the VCR to the manual tracking mode. (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. Per-

form the following adjustments when required. (See Fig.

2-3-1a.) (5) Reduce the V.PB FM waveform by the tracking opera-

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

and linearly with the tracking operation again. When re-

quired, perform fine-adjustment of the guide roller of the

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

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.

(4) Adjust the AUDIO OUT waveform and Control pulse

Level drop at the guide roller (supply side)

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

• Proper waveform variation: Always flat

• Improper waveform variation: Higher Lower

Fig. 2-3-1c

Improper

(a) Guide roller

Head base

A/C head

(2)

(3)

(1)

AUDIO OUT

CTL. P

Fig. 2-3-2a

2.3.3 A/C head phase (X-value)

Proper

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]

(b) Guide pole

Fig. 2-3-1d

2.3.2 Height and tilt of the A/C 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)

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

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

• AUDIO OUT terminal

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

(3) Set the VCR to the manual tracking mode.

(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) Set the VCR to the manual tracking mode. (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) Set the VCR to the manual tracking mode. (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

A/C head

Toward the capstan

Head base

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

(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 Tension pole position

Signal (A) •Back tension cassette gauge Mode (B) •PB

Adjustment part (F) •Adjust pin [Mechansim assembly] Specified value (G)

[PUJ48076-2]

• 25 - 51 gf•cm (2.45 – 5 × 10

-3

Nm]

(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 SECTION 1 DISASSEMBLY.)

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)

Marker

Edge

Waveform output

X-value adjustment point

Drum side Control head position Capstan side

Maximum

Fig. 2-3-3b

2.3.4 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)

Adjustment tool (H)

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

• STOP mode

(Maximum V.PB FM waveform)

• Jig RCU [PTU94023B]

(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.

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

CASS-

69 136 370 412.

CASS-INS

FF/REW

230

STOP

264.

REV

318.

SLOW/STILLPPLAY

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

IN FF/REW

OUT PLAY

SUPPLY

CENTER

TAKE-UP

READY

RESET

OFF

20 42.652.

114.

150.4167.8178.

Timer REC

(drum at stop) POWER OFF

(cassette loaded)

207.2218.2240.2251.

standby

STOP

Backspace Slow FOR

Search REW

Slow REW

293.2304.2320.4335

REC pause

REC

Search FF

STOP

(

drum

in motion)

2-19

MECHANISM ADJUSTMENT (DV)

2.4 PREPARATION

2.4.1 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.

2.4.2 Tools Required for Adjustments

TORQUE DRIVER

YTU94088

Tool for replacing tip IC

PTS40844-2

BIT

YTU94088-003

Table 2-4-1 Tools Required for Adjustments

2.4.3 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

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 “2.11 MECHANISM PHASE CHECK/ADJUSTMENT”.

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

Table 2-4-1 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.

Part numberSymbol

(S1) (S2)

(S3)

Symbol

(W1) (W2)

(W3)

QYTDSP2004Z YQ43893

YQ43893-7

Part number

YQ44246 YQ44246-3 YQ43933-2

Table 2-4-2

Step /Loc Part Name

No.

1 A Cassette housing assembly/ B Mechanism assembly T 1

Fig. No.

2(S1),(L1) – (L5)

Point Note Discription

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) —

§§ §§§§§

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

2-20

2.5 DISASSEMBLY/ASSEMBLY OF THE MECHANISM ASSEMBLY

2.5.1 Introduction

The disassembly and assembly of the mechanism assembly should usually be performed in the ASSEMBLY mode. (Table 2-5-1) 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. 2-5-

MODE

PARTS

ROTARY ENCORDER

R. ENC -20

MAIN CAM GEAR 0

36°

C-IN

ASSEMBLY

17°

S. FF

30.33°

36.33°

33.33

Table 2-5-1

2.5.2 Mechanism Modes

The mechanism has 6 modes as shown in Table 2-6-1. 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. 2-5-1 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 po-

sition between the C-IN (

) mode and S-FF ( H ) mode. This mode can be confirmed by the rotary encoder phase. See Fig. 2-5-7.

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

Fig. 2-5-1 Fig. 2-5-2 Fig. 2-5-3

R S F

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

2-21

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 >

Fig. 2-5-7

2-22

2.6 MECHANISM TIMING CHART

See following table (Table 2-6-1).

MODE

PARTS

36°

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

S/REV

PLAY

ON 1

ON 2

ON 1

ON 2

ASSY

OFF 1 OFF 2

OFF

ASSEMBLY

C-IN

17°

-20

S. FF

30.33°

33.33

4015

36.33°

87°

LOADING END

169.66°

166.66

140

PLAY REV STOP FF/REW

270.33°

276.33°

223.66°

226.66

185

229.66°

303.66°

273.33

220

306.66

245

190.33°

193.33

160

196.33°

CENTERRING ARM

S/REV

Table 2-6-1

2-23

2.7 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

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

2-24

Table 2-7-1

TOP VIEW

11 22

35 14

2 19 42 1 18 41 3

17 12 16 36 20 4 32 26

Fig. 2-7-1

–

33 24 1328

2-25

2.8 DISASSEMBLY/ASSEMBLY A Cassette Housing Assembly/ B Mechanism Assembly

(S1)

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

connected to the circuit board, remove them before disassembly.

(L3)

(L4)

(L1)

Fig. 2-8-1

(L5)

(S1)

(L2)

2. 1 Drum assembly / 2 Motor bracket assembly

(S2)

(S2)

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

move them before disassembly.

<Note 2b>: Be careful not to damage the drum assembly

when removing it.

<Note 2c>: 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.

NOTE: Fasten screw in order

a b

of .

When Handling hold this part.

Fig. 2-8-2A

2-26

Fig. 2-8-2

Middle Catcher Assembly/

SUB BRAKE(T)

OK NG

SPRING HOOKED REVERSE-SIDE

3. 3

(S2)

4 Reel Cover Assembly

(S2)

(S2)

Apply grease

<Note 3a>: Once the reel cover assembly has been re-

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

<Note 3b>: When attaching these screws, screwing order

a b c .

(L6)

Fig. 2-8-3

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

<Note 4c>: How to install the spring

Step 1

Hook a

Step 2

Hook b

(P2)

(S3)

(P3)

(W2)

NOTE4c

<Note 4a>: When attaching this part, fit it in the boss (L7)

on the charge arm assembly.

<Note 4b>: When attaching or removing this part, take care

of the handling of the band section.

<Note 4c>: 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.

(L9)

(W1)

(P1)

Fig. 2-8-4

(W1)

Step 3

Fig. 2-8-4A

(L7)

(L8)

Fig. 2-8-4B

2-27

9 EXIT Guide Arm Assembly/ 10 Swing Arm Assembly

<Note 5a>: EXIT Guide Arm Assembly phase alignment.

EXIT Guide Arm Assembly

Fig. 2-8-5

(W1)

This protrusion is combined to the dent of CHARGE ARM ASS'Y.

Charge Arm Assembly

Gear alignment EXIT Guide Arm

Assembly

Arm Gear 2 Assembly

Fig. 2-8-5A

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

(S2)

(P4)

(P5)

(

L10

(S2)

)

(

)

L11

(S2)

<Note 6a>: When attaching the sub deck assembly, make

sure to adjust the phase of the control plate.

MAIN BRAKE(S)

SPRING HOOKED REVERSE-SIDE

OK NG

Fig. 2-8-6A

MAIN BRAKE(T)

TWISTED SPRING

2-28

Fig. 2-8-6

OK NG

Fig. 2-8-6B

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

(

L12

(

)

L12

Fig. 2-8-7

18 Guide rail (Take up) assembly / 19 Guide rail (Sup)

8. assembly / 20 Base plate assembly

(S2)

)

(

L14

<Note 8a>: When attaching, set the alignment markings of

the two gears so that the markings face oppo-

(

)

L13

(S2)

)

(S2)

site to each other.

Fig. 2-8-8A

Fig. 2-8-8

2-29

Ent. guide base assembly /

9. 23

Timing belt / 24 Center gear assembly

(S2)

Worm wheel 2 /

<Note 9a>: How to attach the worm wheel 2 22 .

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

Fig. 2-8-9A

Phase alignment

Mark (Red)

Fig. 2-8-9

10.

Reel drive pulley assembly / 26

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

DETAIL "A"

FLANGE

(P6)

(W1)

(W3)

(P6)

"A"

Push plate

<Note 10a>: After attaching (W1), confirm that pushes 26

from the top and hit to MAIN DECK. If there are a rattling or inclination in 26 , reconfirm the attachment of (P6). (Take care to the oblique insertion of (P6).)

<Note 10b>: Attach (P6) straight for it which does not get

on on the flange of 28 .

(W1)

2-30

Fig. 2-8-10

11.

Boss (Phase alignment)

29 Tension control arm assembly/ 30 Brake control

arm assembly /

Charge arm assembly

(

)

L16

(W1)

(

(

)

L15

L17

)

<Note 11a>: How to attach the tension control arm assem-

bly 29 / Brake control arm assembly 30 .

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

Fig. 2-8-11A

<Note 11b>: How to attach the charge arm assembly 31 .

12.

Fig. 2-8-11

Connect gear 2 / 33 Connect gear 2

(S2)

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. 2-8-11B

Fig. 2-8-12

2-31

34 Rotary encoder assembly / 35 Main cam /

13. 36 Arm gear 1 assembly / 37 Centering arm assembly

<Note 13a>:

How to attach the rotary encoder assembly 34 .

COLLAR

(

)

L18

(S2)

Fig. 2-8-13

(S2)

(W1)

Mark (colored : red)

Phase alignment

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. 2-8-13A

<Note 13b>: How to attach the main cam 35 .

Boss

Phase alignment

Boss

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. 2-8-13B

<Note 13c>:

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

Phase alignment

Fig. 2-8-13C

2-32

38 Sub cam / 39

Phase alignment

Boss

14.

Arm gear 2 assembly /

40 Clutch lock lever assembly

(

)

L19

(S2)

<Note 14a>: How to attach the sub cam 38 .

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. 2-8-14A

15.41

Fig. 2-8-14

Capstan motor / 42

(S2)

Drum base deck

(S2)

ADJUST NUT

(P7)

<Note 14b>:

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

L19

Fig. 2-8-14B

Fig. 2-8-15

2-33

2.9 LIST OF PROCEDURES FOR DISASSEMBLY

(S2)

(W2)

(P3)

(S2)

COLOR

14(S3)

(S2)

(W1)

(S2)

(W3)

(P6)

(W1)

(S2)

(W1)

(S2)

ADJ.

NUT

(P7)

(S2)

(W1)

(S2)

(W1)

(S2)

31(S2)

(S2)

9(S2)

8(S2)

(S2)

6(S2)

(S2)

(W1)

(S2)

7(S2)

(S2)

(W1)

Note :

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

2-34

Fig. 2-9-1

2.10 MECHANISM PHASE CHECK/ADJUSTMENT

See Fig. 2-10-1.

Worm Wheel 2

See Fig. 2-8-9A.

Rotary Encoder Assembly

See Figs. 2-8-9A and 2-8-13A.

Main Cam See Figs. 2-8-13A and 2-8-13B.

Arm Gear 1 Assembly

See Fig. 2-8-13B.

Centering Arm Assembly

See Fig. 2-8-13B.

Arm Gear 2 Assembly

See Fig. 2-8-14A.

Sub Cam

See Fig. 2-8-14A.

Clutch Lock Lever Assembly

See Fig. 2-8-14A.

Fig. 2-10-1

2-35

2.11 MECHANISM DISASSEMBLY/ASSEMBLY SHEET

Fig. No. No.

Type

A 1 2 3 4 7 11

1 18234567891011121314151617

Attachin

Ref. Fig.

Screw Management Table

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

A Cassette housing assembly

(

(L4)

(L1)

(L3)

S2 S2 S2

2-13-4

1 Drum assembly

)

(S2)

(S1)

(S2)

S2×3

2 Motor bracket assembly

(S2)

(L5)

(L2)

(S2)

S2×4

3 Middle catcher assembly

(S2)

4 Reel cover assembly

S2, L6×2

Pinch roller arm assembly

W1, L7

6 Sub brake assembly

(W1)

2-13-6

(W1)

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

(S2)

S1×2, L1-L5

S2×3

P1, W1, L8

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

assembly

(

)

L13

(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

(

L16

W1 W1 W3 P6 L15 W1, L16

35 Main cam 36 Arm gear 1 assembly

(W1)

Collar

Centering arm assembly

(

)

L18

38 Sub cam

(S2)

(P1)

(S2)

Brake control arm assembly

) (W1)

W1 COLLAR L18 S2

Fig. 2-11-1A

2-36

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)

(S3)

(W2)

11 Sub deck assembly

S3, P2, L9, W2

8 Tension arm sub

assembly

(P3)

EXIT guide arm assembly

(W1)

S2×4

10 Swing arm assembly

(S2)

2-13-14

(S2)

Main

Brake(Sup)

assembly

(P4)

Main

Brake(Take up)

assembly

(P5)

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

(S2)

P4, L10 P5, L11

Reel disk assembly (Sup)

Reel disk assembly (Take up)

16 Prism

(S2)

W1 20 Base plate assembly

21 Ent. guide base

22 Worm wheel 2 23 Timing belt

assembly

(S2)

S2, L14×2 S2

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

assembly

(S2)

(

L17

)

(S2)

L17 S2 S2

39 Arm gear 2 assembly 40 Clutch lock lever

41 Capstan motor 42 Drum base deck

assembly

(

)

L19

(S2)

S2×2

ADJUST NUT

(P7)

L19 S2×3ADJUST NUT, P7

(S2)

Fig. 2-11-1B

2-37

2.12 POSITIONING THE TENSION POLE

See Fig. 2-12-1.

Tension Arm Sub Assembly

B section

D section

Fig. 2-12-1

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 .

Tightening torque for the screw A : 0.06 N.m (0.6

Note :

kgf.cm)

Screw A

2-38

Service Support Software

RS-232C Port

PC Cable

Personal Computer

JVC

INITIAL MODE

DATA CODE CUSTOM CODE

43: A CODE

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

Jig RCU [PTU94023B]

DV MAIN PWB

CN2001

CN1501

CN1503

CN3701

<JLIP>

2.13

COMPATIBILITY AND ERROR RATE ADJUSTMENTS

2.13.1 Preparation

Before disassembly and adjustment, back up the data stored in the EEPROM (IC1504 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 IC4001

(PRE/REC amp on Not Not Check DV MAIN 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 2-13-1

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. Procedure

1. Take out the 6 screws, then remove the top cover. (See Fig. COM1 on page 1-2 of section 1.4.)

2. Connect the jig connector cable to CN2001 on the DV MAIN board.

Jig Connector Cable

PTU94018B

CN1503

DV MAIN PWB

CN2001

CN1501

CN3701

Fig. 2-13-2

3. Setup for computer adjustment

– Setup by extending the jig connector –

When performing the adjustment by the SSS software, set the VCR to JIG mode by transmitting the code "menu", "2", "8", and "OK" in order from the Jig RCU, and set the VCR to external communication mode by transmitting the code "8C" from the Jig RCU.

2.13.2 Adjustment

The actual adjustment requires the following preparation.

1. Tools required for adjustment

Alignment tape

US : MC-1

PAL : MC-2

SSS software

PTU94016-4

Guide driver

YTU94085

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

Fig. 2-13-1

Jig connector cable

PTU94018B

Jig RCU

PTU94023B

Fig. 2-13-3

2-39

2.13.3 Linearity adjustment

The following flowchart shows the linearity check/adjustment procedure.

2.13.4 PB switching point adjustment

The following flowchart shows the PB switching point 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)

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.

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

Yes

Load the alignment tape.

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

2.13.5 Error rate adjustment

The following flowchart shows the error rate adjustment procedure.

Record for about 5 minutes. (Note 6)

While playing the recorded signal, adjust “ 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.

” or “

VCO Center Frequency (ME LP)

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

VCO Center

” in

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.

HID waveform

PB ENV waveform

CH1 CH2

Adjust variation in the parallelism

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.

Yes

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

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.

2.13.6 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.

2-40

2.14 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

Pole Base Assembly (Take-Up)

Cassette Housing Assembly

Gear

Capstan motor

Ejection direction

Fig. 2-14-1

2-41

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:

• Frequency counter

• Audio level meter

• Signal generator: RF / IF sweep / marker

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

• Recording tape (VHS/SVHS)

• Digit-key remote controller (provided)

3.1.2 Required adjustment tools

Jig RCU

PTU94023B

LPF

PTU93006

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

3.1.3

Color(colour) bar signal [PAL]•

•

Horizontal sync

White(100%)

White(75%)

0.7 V

0.3 V

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, it is required to set the VCR to

• the Jig RCU mode (the mode in which codes from the Jig RCU can be received). (See SECTION 1 DISASSEMBLY.)

wide-band, dual-trace, triggered delayed sweep

Alignment tape

(SP, stairstep, PAL)

MHPE

Alignment tape

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

MH-2H

Alignment tape

(LP, stairstep, PAL)

Alignment tape

(SP, stairstep, NTSC)

Color(colour) bar pattern [PAL]

(75%)

Yellow

Cyan

Green

Magenta

Red

Burst

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

Blue

0.3 V V

Cyan

White

Yellow

White

U Black

100%

MHPE-L

MHP

Green

Magenta

Red

Blue

•

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

• If there is a reference to a signal input methed in the signal column of the adjustment chart, “Ext. S-input” means the Y/C separated video signal and “Ext. input” means the composite video signal input.

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

3.1.5 EVR Adjustment

Some of the electrical adjustments require the adjustment performed by the EVR system. The main unit 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.

FDP

3-1

Jig RCU [Data transmitting method]

Depress the “ ” ( 3 ) button after the data code is set.

CUSTOM CODE 43: A CODE

DATA CODE

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

Fig. 3-1-5a EVR mode

INITIAL 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) Set the VCR to the manual tracking mode. (4) Adjust tracking 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).

3.3 Video circuit

3.3.1 D/A level

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

Mode (B)

• Color (colour) bar signal [PAL]

(A2) (A3) • S-VHS tape

• S-VHS

• EE

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

Specified value (G) (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). Switch the input signal to the External input (composite

(4)

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 TBC/2M board]

• 1.00 ± 0.015 Vp-p (reference value)

Trigger point

Switching point

V.sync

V. rate

Fig. 3-2-1a Switching point

3.2.2 Slow tracking preset

Signal (A1) • Ext. input Mode (B1) • VHS SP Measuring point (D) • TV-Monitor

Adjustment part (F) • Jig code “71“ or “72” Specified value (G) • Minimum noise Adjustment tool (H) • Jig RCU [PTU94023B]

(A2) • Color (colour) bar signal [PAL] (B2) • VHS LP

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

the recorded signal. (2) Set the VCR to the manual tracking mode. (3) Set the VCR to the FWD slow (+1/6x) 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 (–1/6x) mode. (8) Repeat steps (1) to (7) in the mode (B2).

Note:

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

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

Y level

H. rate

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

3.3.2 EE Y/PB Y (S-VHS/VHS) level

Signal (A1) • Ext. input

Mode (B1)

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

EVR address (F2)

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

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

• EE

• S-VHS SP

(B2) (B3) • VHS SP

• A : 11

• Jig code “21” twice

(F3) (F4) • Jig code “18” or “19” (Channel +/-)

(1) Set the VCR to the mode (B1). (2) Observe the Y OUT waveform at the measuring point (D). (3) Set the VCR to the EVR mode by transmitting the code

(F1) from the Jig RCU.

(4) Set the EVR address to (F2) by transmitting the code (F3)

from the Jig RCU.

(5) Transmit the code (F4) from the Jig RCU to adjust so that

the Y level of the Y OUT waveform becomes the specified value (G).

(6) 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.)

3-2

V. rate

Specified value (G)

(7) Record the signal (A2) in the mode (B2), and play back

the recorded signal. (8) Set the VCR to the manual tracking mode. (9) Repeat steps (1) to (5) in the mode (B2). (10)

Record the signal (A2) in the mode (B3), and play back

the recorded signal. (11)

Set the VCR to the manual tracking mode. (12)

Repeat steps (1) to (5) in the mode (B3).

Y level

H. rate

Fig. 3-3-2a EE/PB Y level

3.3.3 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 code “57”

EVR address (F2)

(F3)

(F4) • Jig code “18” or “19” (Channel +/-) Specified value (G)

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

• A : 02

• Jig code “20” and “22”

• SP: “B” x 125 ± 5%

• LP: “B” x 125 ± 5%

Adjustment tool (H1) • Jig RCU [PTU94023B]

(H2) • LPF [PTU93006] (See Fig. 3-3-3a.)

(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.

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

3.3.4 Video EQ (Frequency response)

Signal (A1) • Ext. S-input

Mode (B1)

Equipment (C) • Oscilloscope Measuring point (D1)

Frequency marker(D2) • 3 [MHz] External trigger (E) • TP111 (D.FF) EVR mode (F1)

EVR address (F2)

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

(A2) • Video sweep signal

• S-VHS SP

• S-VHS LP

(B2)

• Picture Control / Smart Picture

(B3)

REC : Normal / Natural PB : Edit / Distinct

• Y OUT terminal (75Ø terminated)

• Jig code “57”

• A : 03

• Jig code “20” and “23”

(F3) (F4) • Jig code “18” or “19” (Channel +/-)

• LP: 3.2 ± 0.4 div. (–2 ± 1 dB)

Adjustment tool (H)

• Jig RCU [PTU94023B]

PB. FM

1 kØ 39 µH 180 µH

120 pF 180 pF

629 [kHz] PB COLOR (PB COLOUR)

Fig. 3-3-3a LPF

(1)

Connect the adjustment tool (H2) 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) Set the VCR to the manual tracking mode. (5) Adjust tracking 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 transmitting the code (F3)

from the Jig RCU. (9) Transmit the code (F4) from the Jig RCU to adjust so that

the higher level channel becomes the specified value (G)

of the note "B" level as shown in Fig. 3-3-3b. (Adjust be-

fore 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 invert-

ing phenomenon or noise appearing on the playback

screen. 3-3

(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) Set the VCR to the manual tracking mode. (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 transmitting the code (F3)

from the Jig RCU. (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, transmit the code

(F4) from the Jig RCU to adjust so that the (D2) marker

level reaches the specified value (G). (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. 3-3-4a Video EQ (Frequency Response)

3.3.5 Auto picture initial setting

V. rate

Specified value (G1)

Specified value (G2)

Signal (A1) • Ext. input

Mode (B) • Adjustment part (F) • Jig code “58” Specified value (G) • STOP mode Adjustment tool (H)

• Video: Optional

(A2) (A3) • VHS tape

EE ¥ Auto adjust (SP/LP REC ¥ PB)

• Jig RCU [PTU94023B]

(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.

3.3.6 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) • 1.00 ± 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).

(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) Set the VCR to the manual tracking mode. (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 transmitting the code (F3)

from the Jig RCU. (7) Transmit the code (F4) from the Jig RCU to adjust 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, transmit the

code (F4) from the Jig RCU to adjust so that the wave-

form level of the lower channel level becomes the speci-

fied 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.)

Fig. 3-4-1a Audio REC FM

Specified value (G)

H. rate

Fig. 3-3-6a 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)

EVR address (F2)

Specified value (G1) • 400 ± 100 mVp-p Adjustment tool (H) • Jig RCU [PTU94023B]

• Audio: No signal

(A2) (A3) •

Video: Color (colour) bar signal [PAL]

• Jig code “57”

• A : 30

(F3)

• Jig code “23” and “20”

(F4) • Jig code “18” or “19” (Channel +/-) (G2) • More than 250 mVp-p

3.5 Syscon circuit [SR-VS30E] 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)

Short point (D2) Adjustment part (F) • C3025 (TIMER CLOCK)

Specified value (G)

• IC3001 pin 61

• IC3001 pin 24

(D3) • C3026 + and –

• 1024.008 ± 0.001 Hz

(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).

3-4

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.

PROM (IC1504 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

3.6.3 Tools required for adjustments

Alignment tape

US : MC-1 PAL : MC-2

Jig connector cable

PTU94018B

SSS software

PTU94016-4

3.6.4 Setup

1. Setup for computer adjustment

— Setup by extending the jig connector —

Jig RCU [PTU94023B]

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

CN1503

CN3701

DV MAIN PWB

CN2001

CN1501

INITIAL MODE

DATA CODE CUSTOM CODE

43: A CODE

<JLIP>

PC Cable

Service Support Software

RS-232C Port

JVC

Personal Computer

US : QAM0099-002 PAL : QAM0099-005

3-5

PC cable

Jig RCU

PTU94023B

Fig. 3-6-3a

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

VICTOR COMPANY OF JAPAN, LIMITED VIDEO DIVISION

S40894

Printed in Japan

JVC SR-VS30E/EK Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

TABLE OF CONTENTS

Important Safety Precautions

SECTION 1

1.1 HOW TO REMOVE THE MAJOR PARTS

1.3 DISCONNECTION OF CONNECTORS (WIRES)

1.2 HOW TO READ THE DISASSEMBLY AND ASSEMBLY

HOW TO REMOVE THE MAJOR PARTS <COM section>

HOW TO REMOVE THE MAJOR PARTS <VHS section>

HOW TO REMOVE THE MAJOR PARTS <DV section>

1.7 CONNECTION

1.8 SERVICE POSITIONS

1.9 Jig RCU mode

1.10 MECHANISM SERVICE MODE

1.11 Emergency display function

SECTION 2

MECHANISM ADJUSTMENT (VHS)

2.1 Before starting repair and adjustment

2.2 Replacement of major parts

2.3 Compatibility adjustment Notes:

MECHANISM ADJUSTMENT (DV)

2.4 PREPARATION

2.5 DISASSEMBLY/ASSEMBLY OF THE MECHANISM ASSEMBLY

2.6 MECHANISM TIMING CHART

2.7 MECHANISM ASSEMBLY/DISASSEMBLY PROCEDURE TABLE Step

2.8 DISASSEMBLY/ASSEMBLY A Cassette Housing Assembly/ B Mechanism Assembly

2.9 LIST OF PROCEDURES FOR DISASSEMBLY

2.10 MECHANISM PHASE CHECK/ADJUSTMENT

2.11 MECHANISM DISASSEMBLY/ASSEMBLY SHEET

2.12 POSITIONING THE TENSION POLE

COMPATIBILITY AND ERROR RATE ADJUSTMENTS

2.14 TAPE EJECTION

SECTION 3

ELECTRICAL ADJUSTMENT (VHS)

3.1 Precaution

3.2 Servo circuit

3.3 Video circuit

3.4 Audio circuit Notes:

3.5 Syscon circuit [SR-VS30E] Note:

ELECTRICAL ADJUSTMENT (DV)

3.6 PREPARATION