JVC HM-DH5US, HM-DT100US Service Manual

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Page 1

YD032200411

REMOTE

CODE

A/B/C/D

VCR

CABLE

/DBS

PROGRAM PROG.CHECK

EPG SUB CH +

START STOP DATE

- DIGITAL CH

DTV MENU SUB CH -

. , ?

ABC DEF

JKL MNO

GHI

DBS

DAILY

PQRS TUV WXYZ

AUX

C. RESET

CANCEL

PLAY

EW R

STOP

NAVI

SERVICE MANUAL

D-VHS DIGITAL RECORDER

HM-DH5US,HM-DT100US

POWER

TV/VCR

TIMER

TV/VCR CH

REC LINK

SUBTITLE

REC

SPEED

WEEKLY

ENTER

SKIP

F F

AUS

TV VOL

O T I N

S I

MTP NTSC

ntegrated

HDTV

HM-DH5US,HM-DT100US [D4D4, D4D7]

For disassembling and assembling of MECHANISM ASSEMBLY, refer to the SERVICE MANUAL No.86700(MECHANISM ASSEMBLY).

TABLE OF CONTENTS

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

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18

No.YD032

2004/11

Page 2

SPECIFICATION

GENERAL

Power requirement AC 120 V, 60 Hz

Power consumption

Power on 45 W 60 W Power off 14 W

Temperature

Operating 5°C to 40°C (41°F to 104°F)

Storage -20°C to 60°C (-4°F to 140°F)

Operating position Horizontal only

Dimensions (W × H × D) 435 mm × 96 mm × 376 mm

Weight 5.1 kg (11.2 lbs) 5.8 kg (12.8 lbs)

Maximum recording time

D-VHS (HS) 210 min. with DF-420 video cassette

D-VHS (STD) 420 min. with DF-420 video cassette

D-VHS (LS3) 1260 min. with DF-420 video cassette S-VHS/VHS (SP) 210 min. with ST-210 video cassette S-VHS/VHS (EP) 630 min. with ST-210 video cassette

VIDEO/AUDIO (D-VHS)

Video format MPEG2 standard Audio format Encode MPEG1 Layer2, Decode MPEG1 Layer2/Dolby Digital, LINEAR PCM (HS/STD)

Track composition

Tape speed 33.4 mm/sec (HS mode), 16.67 mm/sec (STD mode), 5.55 mm/sec (LS3 mode)

Head azimuth ±30 deg

Drum rotation 1800 rpm

Tracking system CTL track system

Recording specification

Main data input rate 28.2 Mbps (HS mode), 14.1 Mbps (STD mode), 4.7 Mbps (LS3 mode)

Interface IEEE1394 compliant DTCP digital copy protection compatible

VIDEO/AUDIO (S-VHS/VHS)

Format S-VHS/VHS NTSC standard

Signal system NTSC-type color signal and EIA monochrome signal, 525 lines/60 fields

Recording/Playback system DA4 (Double Azimuth) head helical scan system

Signal-to-noise ratio 45 dB

Frequency range 70 Hz to 10,000 Hz (Normal audio), 20 Hz to 20,000 Hz (Hi-Fi audio)

TUNER

Tuning system Frequency synthesized tuner

Channel coverage VHF: Channels 2 - 13, UHF: Channels 14 - 69, CATV: 113 Channels

TIMER

Clock reference Quartz

Program capacity 1-year programmable timer/24 programs

Memory backup time Approx. 10 min.

CONNECTORS

Input/Output

Antenna 75 Ω, F-type

S-video input Y : 0.8 - 1.2 Vp-p, 75 Ω, C : 0.2 - 0.4 Vp-p, 75 Ω

S-video output Y : 1.0 Vp-p, 75 Ω, C : 0.29 Vp-p, 75 Ω

Video input 0.5 - 2.0 Vp-p, 75 Ω (pin jack)

Video output 1.0 Vp-p, 75 Ω (pin jack)

Audio input -8 dB, 50 kΩ (pin jack) Corresponding to mono (left)

Audio output -8 dB, 1 kΩ (pin jack)

i.Link 4-pin (S400) for MPEG2 input/output, DV input

Component video output Y : 1.0 Vp-p, 75 Ω, CB/CR, PB/PR 0.7 Vp-p, 75 Ω

HDMI output 19-pin Corresponding to HDCP

JLIP Ø3.5 mm

AV Compulink Ø3.5 mm

CABLE BOX Ø3.5 mm

Digital audio output

Optical -18 dBm, 660 nm Corresponding to Dolby Digital and DTS Digital Surround Bit stream.

ACCESSORIES

Provided accessories Infrared remote control unit, AA battery x 2, Audio cable, RF cable (F-type), S-video cable (4-pin), Controller

HM-DH5US HM-DT100US

(17-3/16" × 3-4/5" × 14-4/5")

Selectable in digital audio output setting menu.

435 mm × 96 mm × 383 mm (17-3/16" × 3-4/5" × 15-1/8")

• Specifications shown are for SP mode unless otherwise specified.

• E.& O.E. Design and specifications subject to change without notice.

• Manufactured under license from Dolby Laboratories. "Dolby" and the double-D symbol are trademarks of Dolby Laboratories.Confidential unpublished works. Copyright 1992-1997 Dolby Laboratories. All rights reserved.

•VCR Plus+, C Gemstar Development Corporation. US Patent Numbers 5,307,173; 5,335,079; 4,908,713; 4,751,578; and 4,706,121.

•DSS ration.

• "DTS" and "DTS Digital Out" are trademarks of Digital Theater Systems, Inc.

• HDMI, the HDMI logo and High-Definition Multimedia Interface are trademarks or registered trademarks of HDMI Licensing LLC.

and PlusCode are registered trademarks of Gemstar Development Corporation.The VCR Plus+ system is manufactured under license from

is an official trademark of DIRECTV, Inc., a unit of GM Hughes Electronics. DISH NetworkTM is a trademark of Echostar Communications Corpo-

• (i.Link) refers to the IEEE1394-1995 industry specification and extensions thereof. The logo is used for products compliant with the i.Link standard.

1-2 (No.YD032)

Page 3

SECTION 1

PRECAUTION

1.1 SAFTY PRECAUTIONS

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

1.1.1 Precautions during Servicing

(1) Locations requiring special caution are denoted by labels

and inscriptions on the cabinet, chassis and certain parts of the product.When performing service, be sure to read and comply with these and other cautionary notices appearing in the operation and service manuals.

(2) Parts identified by the symbol and shaded ( ) parts

are critical for safety. Replace only with specified part numbers.

NOTE :

Parts in this category also include those specified to comply 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:

• Wires covered with PVC tubing

• Double insulated wires

• High voltage leads

(5) Use specified insulating materials for hazardous live parts.

Note especially:

• Insulation Tape

• PVC tubing

•Spacers

• Insulation sheets for transistors

•Barrier

(6) When replacing AC primary side components (transformers,

power cords, noise blocking capacitors, etc.) wrap ends of wires securely about the terminals before soldering.

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.

(12) Crimp type wire connectorIn such cases as when replacing

the power transformer in sets where the connections between the power cord and power trans former 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.

• Connector part number :E03830-001

• Required tool : Connector crimping tool of the proper type which will not damage insulated parts.

• Replacement procedure

a) Remove the old connector by cutting the wires at a

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

cut close to connector

Fig.1-1-3

b) 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.1-1-4

c) Align the lengths of the wires to be connected. In-

sert the wires fully into the connector.

Metal sleeve

Fig.1-1-1

(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.1-1-2 (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.

Connector

Fig.1-1-5

d) As shown in Fig.1-1-6, use the crimping tool to

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

1.2 5

5.5

Crimping tool

Fig.1-1-6

e) Check the four points noted in Fig.1-1-7.

Not easily pulled free

Wire insulation recessed

more than 4 mm

Crimped at approx. cente

of metal sleev

Conductors extended

Fig.1-1-7

(No.YD032)1-3

Page 4

1.1.2 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 Fig.1-1-11 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 Fig.1-1-11 below.

Chassis

Power cord primary wire

Fig.1-1-8

(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 Fig.1-1-9 and following Fig.1-1-12.

Externally exposed accessible part

Fig.1-1-9

(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 Fig.1-1-10 and grounding specifications.

AC inlet

Earth pin

Exposed accessible part

MIlli ohm meter

Grounding Specifications

Region

USA & Canada

Europe & Australia

Grounding Impedance (Z

Z 0.1 ohm

Z 0.5 ohm

)

Fig.1-1-10

AC Line Voltage

100 V

100 to 240 V

110 to 130 V

200 to 240 V

Region

Japan

USA & Canada

Europe & Australia

Insulation Resistance (R

R 1 M /500 V DC

1 M R 12 M /500 V DC

R 10 M /500 V DC

)

Dielectric Strength

AC 1 kV 1 minute

AC 1.5 kV 1 minute

AC 1 kV 1 minute AC 3 kV 1 minute

AC 1.5 kV 1 minute

(

Class

(

Class

Clearance Distance (d), (d'

d, d' 3 mm

d, d' 4 mm

d, d' 3.2 mm

d 4 m m

)

d' 8 m m (Power cord d' 6 m m (Primary wire

)

Fig.1-1-11

AC Line Voltage

100 V

110 to 130 V

220 to 240 V

Region

Japan

USA & Canada

Europe & Australia

Load Z

0.15

1.5

Leakage Current (i)

i 1 mA rms

i 0.5 mA rms

i 0.7 mA peak i 2 mA dc

a, b, c

Exposed accessible parts

Antenna earth terminals

Other terminals

Fig.1-1-12

NOTE :

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

)

1-4 (No.YD032)

Page 5

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1 Service position

This unit has been designed so that the Mechanism and Main board assemblies can be removed together from the bottom chassis. Before diagnosing or servicing the circuit boards, take out the major parts from the bottom chassis.

2.1.1 How to set the "Service position"

(1) Refer to the disassembly procedure and perform the disas-

sembly of the major parts before removing the Mechanism assembly.

(2) Remove the screws that fix the Mechanism, Main board as-

sembly to the bottom chassis. If any other screws are used to fix the boards, remove them also.

(3) Remove the combined Mechanism, switching regulator,

digital, junction and Main board assemblies. (4) If any other major parts are used, remove them also. (5) Connect the wires and connectors of the major parts that

have been removed in steps (1) to (4). (Refer to Fig. 2-1a,

2-1b.) (6) Place the combined Mechanism, Main board and other

board assemblies upside down. (7) Insert the power cord plug into the power outlet and then

proceed with the diagnostics and servicing of the board as-

sembly.

Notes:

• Before inserting the power cord plug into the power out-

let, make sure that none of the electrical parts are able

to short-circuit between the workbench and the board assembly.

• For the disassembly procedure of the major parts and

details of the precautions to be taken, see "Removing the major parts".

• If there are wire connections from the Main board and

Mechanism assemblies to the other major parts, be sure to remove them (including wires connected to the major parts) first before performing step (2).

• When carrying out diagnosis and repair of the Main

board assembly in the "Service position", be sure to ground both the Main board and Mechanism assemblies. If they are improperly grounded, there may be noise on the playback picture or FDP counter display may move even when the mechanism is kept in an inoperative status.

• In order to diagnose the playback or recording of the

cassette tape, set the Mechanism assembly to the required mode before placing it upside down. If the mechanism mode is changed (including ejection) while it is in an upside down position the tape inside may be damaged.

• For some models, the mechanism and board assem-

blies are attached by connectors only. When carrying out a diagnosis or repair of the boards in the "Service position", make sure that the connectors are not disconnected.

TP602 A/HS2_FF

TP622 PB_DATA2

PRE/REC board assembly

OPERATION / JACK board assembly

VR2251 FMA REC LEVEL

TP612 REC_LEVEL2

TP611 REC_LEVEL1

TP621 PB_DATA1

CN3901

CN3104

CN7202

CN7101

FW7001

TP111 D.FF TP4001 CTL.P TP2253 A.PB FM TP106 PB FM TP2254 A.REC FM

DIGITAL board assembly

CN7111

CN8003

CN601CN602

TP501 Y TO SE

CP3002

CP4002

CN3003

MAIN board assembly

CN3002

CN402

CN401

CN9301

CN9003

DIGITAL TUNER UNIT

SWICTH / DISPLAY board assembly

CN7201

CN7001

Fig.2-1a

(No.YD032)1-5

Page 6

DIGITAL board assembly

MAIN board assembly

SWICTHING REGULATOR board assembly

JUNCTION board assembly

JACK board assembly

Digital tuner unit

SWICTH / DISPLAY board assembly

TP111 D.FF TP4001 CTL.P TP2253 A.PB FM TP106 PB FM TP2254 A.REC FM

PRE/REC board assembly

OPERATION / JACK board assembly

Fig.2-1b

2.2 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.

Note:

• Confirm the RCU mode when exchanged parts. Since

some SERVICE PARTS sets the VCR to the Jig RCU mode as initial setting. Therefore please set the VCR to the user RCU mode after replacing the EEPROM.

User RCU mode

Jig RCU mode

(ޓblinked)

Fig.2-2a User/Jig RCU mode

2.2.1 Setting the Jig RCU mode

(1) Turn on the power. (2) Press the following remocon keys continuously within 2

seconds " MENU "

→ " 2 " → " 8 " → " OK ".

When the VCR is set to the Jig RCU mode, the symbols ( " : " ) in the time display of the FDP are blinked. (Refer to Fig.2-2a User/Jig RCU mode)

2.2.2 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 "43-80" from the Jig RCU.

2.3 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".

2.3.1 How to set the "Mechanism service mode"

(1) Set the VCR to the Jig RCU mode (the mode in which

codes from the Jig RCU can be received) (2) Transmit the code "43-E5" from the Jig RCU. (3) Release the lug of the Cassette holder and then slide the

Cassette holder toward the direction where the Cassette

holder is loaded by manually. (4) The cassette holder lowers and, when the loading has

completed, the mechanism enters the desired mode.

When the VCR is set to the Mechanism service mode, the

symbols ("TIMER") in the FDP (LED) are blinked.

2.3.2 How to exit from the "Mechanism service mode"

(1) Unplug the power cord plug from the power outlet.

2.4 Maintenance and inspection

2.4.1 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.

Note:

• Absolutely avoid sweeping the upper drum vertically as

this will cause damage to the video head.

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

soak a piece of closely woven cloth with alcohol and while

holding the cloth onto the upper drum by the fingers, turn

the upper drum counterclockwise. (2) To clean the parts of the tape transport system other than

the upper drum, use a piece of closely woven cloth or a cot-

ton swab soaked with alcohol.

1-6 (No.YD032)

Page 7

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

pletely dry before using the cassette tape.

A/C head

Video heads

Fig.2-4a

2.4.2 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.

2.4.3 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

Operation hours

1000H 2000H

Drum assembly C,X X

A/C head C,X C,X

Pinch roller arm assembly C C

Tape transport

Full erase head C C

Tension arm assembly C C

Capstan motor (Shaft) C C

Guide arm assembly C C

Capstan motor X

Capstan brake assembly X

Main brake assembly X

Drive

Belt (Capstan) X X

Loading motor X

Clutch unit X

Worm gear X

Control plate X

Other Rotary encoder X

C : Cleaning X : Inspection or Replacement if necessary

(No.YD032)1-7

Page 8

SECTION 3

DISASSEMBLY

3.1 Removing the major parts

3.1.1 Destination of connectors

Two kinds of double-arrows in connection tables respectively

show kinds of connector/wires.

: The connector of the side to remove

CONN. No. PIN No.CONNECTOR

WR2a

WR2b

Main CN101

Main CN103

 Destination of connectors

CONN. No. PIN No.CONNECTOR

WR2a

WR2b

WR2c

WR3a

WR3b

WR3c

WR3d

WR3e

WR3f

WR3g

WR3h

CN1901

WR4a

WR4b

WR5a

WR5b

WR5c

WR7a

WR9a

CN603

(CN3001)

WR10a

WR10b

WR10c

Main

Junction

PRE/REC

Digital

Main

Digital

Junction

Switching regulator

Junction

PRE/REC

Main

Drum assembly

Main

3.1.2 How to read the procedure table

This table shows the steps for disassembly of the externally furnished parts and board assemblies. Reverse these steps when re-assembling them.

Step/

Loc No.

[1] Top cover 3-1a

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

Part Name

Bracket 2(S1c)

(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.

: Wire: Flat wire : Board to board (B-B)

Digital CN761

Digital CN762

CN3104

CN3102

CN5505

CN601

CN602

CN911

CN8002

CN8001

CN7111

CN7107

CN3003

CN1901

CN5502

CN5503

CN5304

CN5302

CN5301

CN5508

CN604

CN603

CN2001

CN1

Fig.

No.

Operation jack

Switch display

Digital

Jack

Junction

Switching regulator

Digital

Digital tuner unit

Junction

Fan motor

Main

Drum assembly

Main

A/C head

Capstan motor

Drum assembly

Point Note

4(S1a),(S1b),3(L1a), <Note 1a> 2(SD1a),(P1a),(W1a), CN1(WR1a),

----------------------------------------

CN7201

CN7001

CN7002

CN401

CN402

CN4106

CN5504

CN5503

CN9001

CN9301

CN8003

CN5501

CN3011

CN3101

CN3001

110

(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

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

(5) Adjustment information for installation

3.1.3 Disassembly procedure

Step/

Loc No.

[1] [2]

[3]

[4]

[5]

[6] [7] [8]

[9]

[10]

[11]

Part Name

Top cover Front panel assembly (Operation jack board assembly) (Switch display board assembly)

Digital board assembly

Digital tuner unit (HM-DT100US)

Switching regulator board assembly

Jack board assembly Junction board assembly Rear cover

PRE/REC board assembly

Mechanism assembly

(Drum assembly)

(Cleaner assembly) (Inertia plate) (Roller arm assembly) Main board assembly

Fig. No.

3-1d 3-1a 3-1d

3-1d

3-1d 3-1d 3-1d

3-1d

Point Note

6(S1a) 3(L2a),5(L2b) CN3104(WR2a) ,CN3002(WR2b) ,CN5505(WR2c) 5(S3a),(S3b), CN601(WR3a), CN602(WR3b), CN911(WR3c), CN8002(WR3d), CN8001(WR3e), CN7111(WR3f), CN7107(WR3g), CN3003(WR3h), CN1901 4(S4a),CN5502(WR4a), CN5503(WR4b) COAXIAL(WR4c) 3(S5a), CN5304(WR5a), CN5302(WR5b), CN5301(WR5c), (S6a) 3(S7a),CN5508(WR7a) 6(S8a),(S8b),3(L8a)

(S9a),(S9b) CN604(WR9a) CN603(CN3001) 2(S10a),(S10b), CN2001(WR10a),(WR10b) CN1(WR10c), (S10c),(S10d),(S10e) 2(L10a) 4(L10b) (L10c),(P10a) 3(S11a)

• Be careful not to damage the connector and wire etc. during connection and disconnection.

• When connecting the flat wire to the connector, be careful with the flat wire direction.

• When reattaching the Front panel assembly, make sure that the door opener of the Side frame (R) is lowered in position prior to the reinstallation.

1-8 (No.YD032)

Page 9

• When reattaching the Front panel assembly, pay careful attention to the switch lever of the Front panel assembly not to make it touch the switch knob of the Main board assembly from the side.

• When reattaching the Front panel assembly, lift the Cassette door slightly.

Door opener

Side frame(R)

Switch knob

Switch lever

Fig.3-1a

• When reattaching the Mechanism assembly, secure the screws (S10a to S10b) in the order of a,b.

• When reattaching the Mechanism assembly, be sure to align the phase of the Rotary encoder on the Main board assembly.

• When reattaching the Mechanism assembly, set the “Mechanism assembling mode”. [See “MECHANISM ASSEMBLY SERVICE MANUAL (No. 86700)”.]

• When reattaching the Mechanism assembly to the Main board assembly, take care not to damage the sensors and switch on the Main board assembly.

• When reattaching the Drum assembly, secure the screws (S10c to S10e) in the order of c, d, e.

(S10d)

Mechanism assembly

(S10c)

(S10e)

Drum assembly

(S10d)

<NOTE> Attach the Drum assembly appropriately, since the installation state of the Drum assembly influences the FM WAVEFORM LINEARITY greatly.

(S10c)

(S10e)

HOOK

Fig.3-1b

• When handling the drum assembly alone, hold it by the motor or shaft. Be careful not to touch other parts, especially the video heads. Also take care not to damage the connectors.

Shaft

Motor

Video heads

Fig.3-1c

(No.YD032)1-9

Page 10

(

)

WR3

(

)

WR3f

PRE/REC BOARD ASSY

MAIN BOARD ASSY

(

)

WR9a

CN3104

SIN TWIST WIRE

from FRONT PANEL

(SWITCH/DISPLAY

(OPERATION/JACK WR7201)

HOLD PART OF ROLLER ARM ASS'Y WHILE ATTACHING INERTIA PLATE. INERTIA PLATE SHOULD BE ATTACHED SO AS TO SER SMALL DIAMETER OF CENTRAL ROUND HOLE ABOVE.

POSITION ROLLER'S INSTALLATION HOLE IN THE "A" PART.

INSERT ROLLER UNTIL THE "b" PART OF ROLLER'S HOOK IOCK UP TO THE "B" PART.

HITCH THE "c" PART OF SPRING TO THE "C" PART.

(

)

L10b

(

)

CN602

(

)

WR10c

(

WR10b

CN7001)

Inertia plate

(P10a)

(

L10c

CN7107

CN601

A/C HEAD

(

WR10a

)

from FRONT PANEL

)

(

WR3a

CN2001

CN3002

(OPERATION/JACK

)

(

CN7111

CN3011

CN5301

)

CN3003

)

CN3101

)

(

Note

2a>

CN7201)

[10]Roller arm assembly

[10]Mechanism assembly

[11]Main board assembly

JS3001

<Phase alignment> .

Accord the position of V gap on R.ENCORDER and PWB silk

Accord the position of Boss on R.ENCORDER and PWB silk

(L2b)

(L2a)

Cassette door

(L2b)

Main board assembly

(CN3104)

(WR2a)

CN7201

Operation/jack board assembly

BOTTOM SIDE

FW7001

CN7002

(

WR5c

FAN

CN8003

CN402

CN401

CN9301

CN5303

CN5304

CN9001

CN5501

CN5506

CN8001

CN8002

(

CN5504

)

(

CN5505

to TERMINAL BOARD

from FRONT PANEL (SWITCH/DISPLAY CN7002)

[10]Drum assembly

[10]Inertia plate

(S10a)

(S11a)

(L2a)

Main board assembly

(CN3002)

(WR2b)

CN7001

CN7003

)

CN911

DIGTAL BOARD ASSY

SWITCHING REGULATOR BOARD ASSY

)

(

WR5a

)

CN4106

JUNCTION BOARD ASSY

(

WR4c

(S10c)

(S10e)

(S10d)

S3003

[2]Front panel assembly

(L2b)

Junction board assembly (CN5505)

CN7002

CN7004

)

[10]Cleaner assembly

3004

CN1

J S

3 0

0 1

(WR2c)

(S1a)

(S8b)

[9]PRE/REC board assembly

(S9b)

After attached of the head cleaner on main deck, The cleaner must rotate at the same time as coming in contact with drum at the loading or unloading.

(L10a)

There must not be noise.

(S10a)

(S10b)

(L8a)

(S9a)

[3]Digital board assembly

(S11a)

(S4a)

(S11a)

[4]Digital tuner unit

(S4a)

(WR4a)

(S7a)

[6]Jack board assembly

(S6a)

CN4106

Switch/display board assembly

(S1a)

(S8a)

(L8a)

(S3a)

(S4a)

(WR4b)

(S5a)

(S7a)

[7]Junction board assembly

[1]Top cover

(S1a)

(S3a)

(S5a)

CN5302

(S5a)

CN5502

(S7a)

(S1a)

(S8a)

(S3b)

[8]Rear cover

(L8a)

(S3a)

CN5001

[5]Switching regulator

board assembly

CN5503

1-10 (No.YD032)

NOTE) INSERT FFC WIRE TO THE CONNECTOR BEFORE ATTACHING TO FRONT PANEL.

NOTE) WHEN YOU FIX ANY PWB WITH THE SCREW, PUT IT ON THE JIGS.

TOP SIDE

Fig.3-1d

Page 11

SECTION 4

ADJUSTMENT

4.1 Before adjustment

4.1.1 Precaution

• The adjustments of this unit include the mechanism compatibility and electrical adjustments. During the performance of this work, be sure to observe the precautions for each type of adjustment.

• If there is a reference to a signal input method 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.

4.1.2 Required test equipments

• Color (colour) television or monitor

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

• Signal generator: RF / IF sweep / marker

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

• Recording tape

• Digit-key remote controller(provided)

4.1.3 Required adjustment tools

--- : Not used

: Used

Mechanism

compatibility

adjustment

Roller driver

z ---

Jig RCU --- z

Back tension cassette gauge z ---

Alignment tape(MHP) z ---

Alignment tape(MHP-L) zz

Alignment tape(MD-1) --- z

Alignment tape(MD-1H) --- z

Roller driver

PTU94002

Alignment tape

(SP, stairstep, NTSC)

MHP

Alignment tape

(D-VHS HS, color (colour) bar)

MD-1H

Jig RCU

PTU94023B

Alignment tape

(EP, stairstep, NTSC)

MHP-L

Back tension cassette gauge

(D-VHS STD color (colour) bar)

Electrical

adjustment

PUJ48076-2

Alignment tape

MD-1

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

Color(colour) bar signal [NTSC]

White(100%)

White(75%)

100 IRE

40 IRE

Horizontal sync

Yellow

Cyan

Green

Magenta

Red

Blue

Color(colour) bar pattern [NTSC]

(75%)

Burst

40 IRE

White

Yellow

White

Q I Black

100%

Cyan

Green

Magenta

Red

Blue

4.1.5 Switch settings

When adjusting this unit, set the VCR mode and switches as described below.

• 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 2 SPECIFIC SERVICE INSTRUCTIONS".)

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.4-1 Jig RCU [PTU94023B]

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

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

PICTURE CONTROL/SMART PICTURE NORMAL/NATURAL VIDEO STABILIZER OFF TBC ON Digital 3R ON VIDEO NAVIGATION/TAPE MANAGER OFF BLUE BACK OFF

OFF

4.1.6 Manual tracking mode (Auto tracking ON/OFF) set-

ting

(1) In order to set to the manual tracking mode during tape

playback, press the “CHANNEL + and - ”button on the front panel at the same time.

• When the manual tracking mode is set, the tracking is placed at the center position.

(2) Press “CHANNEL +/-” to adjust the tracking manually.

4.1.7 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.

(No.YD032)1-11

Page 12

• When changing the address setting in the EVR adjust-

ment 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-key0123456789 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.

4.2 Mechanism 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 prevent damaging the alignment tape in the compat-

ibility adjustment, prepare a cassette tape (for self-recording/playback), perform a test on it by transporting it and making sure that the tape is not bent by the tape transport mechanisms such as in the guide rollers.(See Fig.4-2b.)

4.2.1 Tension pole position

Notes:

• This adjustment must be performed every time the ten-

sion band is replaced.

Signal (A) • Back tension cassette gauge [PUJ48076-2]

Mode (B1)

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

Specified value (G)

•PB

(B2)

• Eject end

• 25 - 51 gf•cm (2.45 - 5 x 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.(See Fig.4-2a.)

a) Remove the top frame, cassette holder and side

frames (L/R) all together. (Refer to the SERVICE MANUAL No.86700 [MECHANISM ASSEMBLY].)

b) Rotate the loading motor gear to move the control

plate so that the triangular stamping to the left of the “P”stamping is aligned with the stamping (a) on the main deck. This positioning is mode (B1).

c) Adjust by turning the adjustment pin so that the tip of

the tension arm is aligned with the stamping (b) on the main deck.

d) Rotate the reel disk (S) by about one turn clockwise

and make sure that the round hole of the adjustment pin is located in the “OK” range. If it is outside this

range, restart the adjustment from the beginning. After completion of the adjustment, rotate the loading gear motor to return it to the mode (B2) position.

TENSION ARM

CONTROL PLATE

Stamping(b)

ADJUST PIN

Stamping(a)

Fig.4-2a

4.2.2 FM waveform linearity

Signal (A1)

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

• Alignment tape(SP, stairstep, NTSC) [MHP]

(A2)

• Alignment tape(EP,stairstep,NTSC) [MHP-L]

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

the V.PB FM waveform at the measuring point (D). (3) 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. Perform the

following adjustments when required. (See Fig. 4-2c.) (5) Reduce the V.PB FM waveform by the tracking operation.

If a drop in level is found on the left side, turn the guide roll-

er 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. 4-2c.) (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

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. 4-2b.)

[Perform adjustment step (9) only for the models equipped

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

[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).

Improper

(a)

GUIDE ROLLER

Proper

1-12 (No.YD032)

(b)

GUIDE POLE

Fig.4-2b

Page 13

Proper waveform variation

Improper waveform variation

Up Down

Roller driver

Guide roller (supply side)

Fig.4-2c

4.2.3 Height and tilt of the A/C head

Note:

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

vance to make the adjustment easier after the A/C head has been replaced. (Refer to the SERVICE MANUAL No.86700 [MECHANISM ASSEMBLY].)

Signal (A) • Alignment tape(SP, stairstep, NTSC) [MHP] Mode (B) • PB Equipment (C) • Oscilloscope Measuring point (D1)

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

• TP106 (PB. FM)

(D2)

• TP4001 (CTL. P)

(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. (4) Adjust the AUDIO OUT waveform and Control pulse wave-

form 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 azi-

muth.

Head base

(2)

(1)

AUDIO OUT

4.2.4 A/C head phase (X-value)

Signal (A1)

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

• Alignment tape(SP, stairstep, NTSC) [MHP]

(A2)

• Alignment tape(EP,stairstep,NTSC) [MHP-L]

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

V.PB FM waveform at the measuring point (D). (3) Set the VCR to the manual tracking mode. (4) Loosen the screws (4) and (5), then set the Roller driver to

the innermost projected part of the A/C head. (See Fig. 4-

2e.) (5) Rotate the roller driver so that the A/C head comes closest

to the capstan. From there, move the A/C head back grad-

ually toward the drum until the point where the FM wave-

form is maximized for the second time, and then

tighten the screws (4) and (5) temporarily. (6) Play an alignment tape (A2) and set to the manual-tracking

mode. (7) Fine-adjust A/C head base position to maximize the FM

waveform, and then tighten the screws (4) and (5) firmly. (8) Play alignment tapes (A1) and (A2) and confirm that the FM

waveforms are maximized when the tracking is at the cen-

ter position.

To the drum

Toward the capstan

Toward the drum

A/C head

Screw (5)

Roller driver

Screw (4)

Head base

To the capstan

Fig.4-2e

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

Waveform output

X-value adjustment point

Drum side Control head position Capstan side

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

A/C head

(3)

Fig.4-2d

CTL. P

Maximum

Fig.4-2f

(No.YD032)1-13

Page 14

4.3 Electrical adjustment

Note:

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.

4.3.1 Servo circuit

4.3.1.1 Switching point

Signal (A1)

Mode (B) • PB

Equipment (C) • Oscilloscope

Measuring point (D1)

External trigger (E) • TP111 (D.FF)/slope : –

Adjustment part (F1) • Jig RCU: Code “43-51” or “43-52”

Specified value (G) • 7.5 ± 0.5H

Adjustment tool (H) • Jig RCU [PTU94023B]

• Stairstep signal

(A2)

• Alignment tape (SP, stairstep, NTSC) [MHP]

• TP501 (Y TO SE) [Main board]

(D2)

• TP106 (PB-FM) [Main board]

(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 mea-

suring 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 (F1) 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.

Trigger point

Switching point

V.sync

V. rate

Fig.4-3a Switching point

4.3.1.2 D-VHS switching point

Signal (A1)

Mode (B1)

Equipment (C) • Oscilloscope

Measuring point (D) • (STD) TP621 (PB DATA1)

External trigger (E) • (STD) TP111 (VIDEO/STD/HS1 FF)

Adjustment part (F) • Jig RCU: Code “51” or “52”

Specified value (G) • 230 ± 20µsec

Adjustment tool (H) • Jig RCU [PTU94023B]

• Color (colour) bar

• (STD) Alignment tape [MD-1]

(A2)

• (HS) Alignment tape [MD-1H]

(A3)

•PB

•D-VHS STD

(B2)

•D-VHS HS

(B3)

• (HS) TP622 (PB DATA2)

• (HS) TP602 (A/HS2 FF)

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

D-VHS envelope waveform at the measuring point (D). (3) Set the VCR to the manual tracking mode. (4) Adjust tracking so that the D-VHS envelope waveform be-

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

duration “a” from the waveform end (Hi/Low switching point

of D.FF) to the rising edge of subcode area 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) in the mode (B3).

D-VHS envelope

End of waveform (D.FF signal Hi/Low switching point)

Sub code area

Fig.4-3b D-VHS switching point

4.3.1.3 Slow tracking preset

Signal (A1)

Mode (B1)

Measuring point (D) • TV-Monitor

Adjustment part (F) • Jig code “43-71“ or 43-“72”

Specified value (G) • Minimum noise

Adjustment tool (H) • Jig RCU [PTU94023B]

• Ext. input

(A2)

• Color (colour) bar signal [NTSC]

•VHS SP

(B2)

•VHS EP

(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 mon-

itor 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 “43-

08” from the Jig RCU to enter the slow playback mode, and transmit the code “43-D0” for REV slow (–1/6x) mode.

1-14 (No.YD032)

Page 15

4.3.2 Video circuit

4.3.2.1 SD EE COMPONENT Y level

Signal (A1)

Mode (B) • EE

Equipment (C) • Oscilloscope

Measuring point (D) • COMPONENT Y terminal

EVR mode EVR address

Specified value (G) • 1.00 ± 0.02 Vp-p (terminated)

Adjustment tool (H) • Jig RCU [PTU94023B]

• Internal color bar

(A2)

•S-VHS

• Jig code “43-95”

(F1)

• "01 : **"

(F2)

• Jig code “43-21”

(F3)

• Jig code “43-18” or “43-19” (Channel +/-)

(F4)

• Jig code “43-3C”

(F5)

(1) Insert the cassette tape (A2) to enter the mode (B). (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 (F5) from the Jig RCU again. (When the EVR mode is released, the adjusted data is memorized.)

Y level

Fig.4-3c

4.3.2.2 SD EE COMPONENT CB level

Signal (A1)

Mode (B) • EE

Equipment (C) • Oscilloscope

Measuring point (D) • COMPONENT PB/CB terminal

EVR mode EVR address

Specified value (G) • 0.70 ± 0.02 Vp-p (terminated)

Adjustment tool (H) • Jig RCU [PTU94023B]

• Internal color bar

(A2)

•S-VHS

• Jig code “43-95”

(F1)

• "06 : **"

(F2)

• Jig code “43-26”

(F3)

• Jig code “43-18” or “43-19” (Channel +/-)

(F4)

• Jig code “43-3C”

(F5)

(1) Insert the cassette tape (A2) to enter the mode (B). (2) Observe the CB 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 CB level of the CB OUT waveform becomes the specified value (G).

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

code (F5) from the Jig RCU again. (When the EVR mode is released, the adjusted data is memorized.)

PB/CB level

Fig.4-3d

4.3.2.3 EE COLOR (VHS) level

Signal (A1)

Mode (B) • EE

Equipment (C) • Oscilloscope

Measuring point (D) • C OUT (S terminal)

EVR mode EVR address

Specified value (G) • 0.286 ± 0.01 Vp-p (terminated)

Adjustment tool (H) • Jig RCU [PTU94023B]

• Internal color bar

(A2)

•VHS

• Jig code “43-95”

(F1)

• "00 : **"

(F2)

• Jig code “43-20”

(F3)

• Jig code “43-18” or “43-19” (Channel +/-)

(F4)

• Jig code “43-3C”

(F5)

(1) Insert the cassette tape (A2) to enter the mode (B). (2) Observe the COLOR 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 BURST level of the COLOR OUT waveform becomes the specified value (G).

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

code (F5) from the Jig RCU again. (When the EVR mode is released, the adjusted data is memorized.)

BURST level

Fig.4-3e

4.3.2.4 EE Y (VHS) level

Signal (A1)

Mode (B) • EE

Equipment (C) • Oscilloscope

Measuring point (D) • TP501 (Y TO SE) [Main board]

EVR mode EVR address

Specified value (G) • 0.52 ± 0.02 Vp-p

Adjustment tool (H) • Jig RCU [PTU94023B]

• Ext. input

• Color (colour) bar signal [NTSC]

(A2)

•VHS

(A3)

• Jig code “43-95”

(F1)

• "03 : **"

(F2)

• Jig code “43-23”

(F3)

• Jig code “43-18” or “43-19” (Channel +/-)

(F4)

• Jig code “43-3C”

(F5)

(No.YD032)1-15

Page 16

(1) Insert the cassette tape (A3) to enter the mode (B). (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 (F5) from the Jig RCU again. (When the EVR mode is released, the adjusted data is memorized.)

Y level

H. rate

Fig.4-3f

4.3.3 Audio circuit

Note:

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

case.

4.3.3.1 Audio REC FM

Signal (A1)

Mode (B) • S-VHS EP

Equipment (C) • Oscilloscope

Measuring point (D) • TP2253 (A. PB FM) [Main board]

External trigger (E) • TP111 (D.FF)

Adjustment part (F) • VR2251 (FMA REC LEVEL)

Specified value (G1)

• Ext. input

• Audio: No signal

(A2)

• Video: Color (colour) bar signal [NTSC]

(A3)

• 350 ± 50 mVp-p

(G2)

• More than 200 mVp-p

(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) Adjust the Adjustment part (F) 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.) (6) If the specified value (G1) is not obtained, adjust the Ad-

justment part (F) so that the waveform level of the lower

channel level becomes the specified value (G2). (Adjust

before recording, then confirm it by playing back.)

Specified value (G2)

V. rate

Specified value (G1)

Fig.4-3g Audio REC FM

4.3.4 Digital circuit

4.3.4.1 HD EE COMPONENT Y level

Signal (A1)

Mode (B) • EE

Equipment (C) • Oscilloscope

Measuring point (D) • COMPONENT Y terminal

EVR mode EVR address

Specified value (G) • 0.70 ± 0.02 Vp-p (terminated)

Adjustment tool (H) • Jig RCU [PTU94023B]

• Ext. input (i. LINK)

(A2)

• HD color bar signal

• Jig code “43-95”

(F1)

• "07 : **"

(F2)

• Jig code “43-27”

(F3)

• Jig code “43-18” or “43-19” (Channel +/-)

(F4)

• Jig code “43-3C”

(F5)

Notes:

How to input the HD color bar signal.

• Connect an i.LINK cable between the another playback

VCR's i.LINK input/output connector and this VCR's i.LINK input/output connector.

• Select input location"I-1 etc." on this VCR.

• Playback the color bar portion of the alignment

tape[MD-1H] on another playback VCR.

(1) Input the signal (A2) to enter the mode (B). (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 (a) of the Y OUT waveform becomes the specified value (G).

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

code (F5) from the Jig RCU again. (When the EVR mode is released, the adjusted data is memorized.)

Y level (a)

Fig.4-3h

4.3.4.2 HD EE COMPONENT CB level

Signal (A1)

Mode (B) • EE

Equipment (C) • Oscilloscope

Measuring point (D) • COMPONENT PB/CB terminal

EVR mode EVR address

Specified value (G) • 0.525 ± 0.020 Vp-p (terminated)

Adjustment tool (H) • Jig RCU [PTU94023B]

• Ext. input (i. LINK)

(A2)

• HD color bar signal

• Jig code “43-95”

(F1)

• "08 : **"

(F2)

• Jig code “43-28”

(F3)

• Jig code “43-18” or “43-19” (Channel +/-)

(F4)

• Jig code “43-3C”

(F5)

1-16 (No.YD032)

Notes:

How to input the HD color bar signal.

Page 17

• Connect an i.LINK cable between the another playback

VCR's i.LINK input/output connector and this VCR's i.LINK input/output connector.

• Select input location"I-1 etc." on this VCR.

• Playback the color bar portion of the alignment

tape[MD-1H] on another playback VCR.

(1) Input the signal (A2) to enter the mode (B). (2) Observe the PB/CB 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 PB/CB level of the PB/CB OUT waveform becomes the specified value (G).

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

code (F5) from the Jig RCU again. (When the EVR mode is released, the adjusted data is memorized.)

PB/CB level

Fig.4-3i

4.3.4.3 D-VHS REC level

Signal (A1)

Mode (B1)

Equipment (C) • Oscilloscope

Measuring point (D) • (STD) TP611 (REC LEVEL1)

External trigger (E) • (STD) TP111 (VIDEO/STD/HS1 FF)

Adjustment part (F1)

Specified value (G) • 0.105 ± 0.005Vp-p

Adjustment tool (H) • Jig RCU [PTU94023B]

• Ext. input

• Optional

(A2)

• DF-300

(A3)

• D-VHS STD REC

(B2)

• D-VHS HS REC

• (HS) TP612 (REC LEVEL2)

[Main board]

• (HS) TP602 (A/HS2 FF)

• Jig code “43-57”

(F2)

• (STD) A:08

•(HS) A:09

• (STD) Jig code “43-28”

(F3)

• (HS) Jig code “43-29”

• Jig code “43-18” or “43-19” (Channel +/-)

(F4)

(1) Insert the cassette tape (A3) to enter the mode (B1). (2) Apply the external trigger signal to D.FF (E) to observe the

waveform appeared 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 waveform signal level “a” 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.)

(7) Repeat steps (2) to (6) in the mode (B2).

Notes:

• GND (Ground) should be taken from the PRE/REC board

shield case.

• The signal level adjustment should be performed by set-

ting the center (centre) of the darkened section on the CRT bright line.

• After adjusting, always perform the confirmation and re-

adjustment of the item 4.5.4.

Fig.4-3j D-VHS REC level

4.3.4.4 PLL f0

Notes:

• This adjustment should be done after the “D-VHS REC

level adjustment” for the Digital circuit has been completed.

• Do not connect the probe or any other jig to the TP or

shield case of the PRE/REC board during adjustment.

• If auto adjustment is not completed by the above pro-

cedure, re-adjust the adjustment item 4.3.4.3 again.

Signal (A1)

Mode (B1)

Adjustment part (F1)

Specified value (G) • STOP mode

Adjustment tool (H) • Jig RCU [PTU94023B]

• Ext. input

• Optional

(A2)

• DF-300

(A3)

•D-VHS STD

(B2)

• D-VHS HS

• (STD) Jig code “43-96”

• (HS) Jig code “43-91”

• Jig code “43-9B”

(F2)

(1) Insert the cassette tape (A3) to enter the mode (B1). (2) Set the VCR to the Auto adjust mode by transmitting the

code (F1) from the Jig RCU. When the VCR enters the stop mode, the adjustment is completed. When the VCR enters the eject mode, insert the cassette tape again.

(3) Release the Auto adjust mode of the VCR by transmitting

the code (F2) from the Jig RCU.

(4) Repeat steps (2) to (3) in the mode (B2).

(No.YD032)1-17

Page 18

SECTION 5

TROUBLESHOOTING

5.1 Manually removing the cassette tape

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

(1) Unplug the power cord plug from the power outlet. (2) Refer to the disassembly procedure of the VCR and per-

form the disassembly of the major parts before removing

the mechanism assembly. (See Fig. 5-1a)

Fig.5-1a

Tension arm assembly

Pole base assembly

Pinch roller arm assembly

sion arm assembly free from tension, pull out the tape on the pole base assembly. Take the spring(a) of the pinch roller arm assembly off the hook, and detach it from the tape.

(4) Remove the screw (a) of the side frame (L/R). (5) Hold the slack tape and cassette cover together, lift the

cassette tape, top frame, cassette holder and side frames (L, R) together from the rear and remove them by dis-engaging the hooks (a) and (b).

Screw(a)

Cassette tape

Hook(a)

Side frame(L)

Cassette holder

Top frame

Side frame(R)

Screw(a)

Hook(b)

Spring(a)

Direction of unloading

Fig.5-1b

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

gear of the loading motor until the pole base assembly is

hidden behind the cassette lid. In doing so, hold the tape by

the hand to keep the slack away from any grease. (See

Fig.5-1b )

In case of mechanical failures, while keeping the ten-

Fig.5-1c

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

pletes removal of the cassette tape.

5.2 Emergency display function

This unit saves details of the last two emergencies as the EMG history and allows the status of the VCR and the mechanism of each emergency to be shown both on the display and as OSD information. When using the emergency function, it is required to set the VCR to the Jig RCU mode.

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.5-2a Jig RCU [PTU94023B]

5.2.1 Displaying the EMG information

The EMG detail of information can be displayed by transmitting the code "59" from the Jig RCU.

Note:

• The EMG detail information <1><2> show the informa-

tion on the latest EMG. It becomes “ - - : - - : - - ” when there is no latest EMG record.

1-18 (No.YD032)

Page 19

0: 00

E: **

1E: **

1: *1

2: *2

3: 34

4: *5

5: *6

6: *7

7: *8

8: *9

9: *10

Normal display

EMG content display (Latest) See 5.2.4

EMG content display (Previous) See 5.2.4

EMG detail information <1> See 5.2.5 [Deck operation mode] EMG detail information <1> See 5.2.5 [Mechanism operation mode] EMG detail information <1> See 5.3.5 [Mechanism sensor information and Mechanism mode position] EMG detail information <2> See 5.2.6 [Type of the cassette tape in use <1>] EMG detail information <2> See 5.2.6 [Winding position of the cassette tape in use] EMG detail information <2> See 5.2.6 [Type of the cassette tape in use <2> (Winding area)] EMG detail information <3> See 5.2.7 [Previous deck operation mode] EMG detail information <3> See 5.2.7 [The deck operation mode of the one before the last] EMG detail information <3> See 5.2.7

[The deck operation mode of the one prior to one above]

EMG display of FDP display mode

EMG display of 7 FDP display model

Fig.5-2b

5.2.2 Clearing the EMG history

5.2.3 Details of the OSD display in the EMG display mode

During the EMG display, the OSD shows the data on the deck mode, etc. The details of the display contents are as follows.

Notes:

[For MN* only]

(1) Transmit the code “43-59” from the Jig RCU.

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

<Example 1> E : 01

Latest EMG

<Example 2> E : - -

No EMG record

(2) Transmit the code “43-59” 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 “43-59” 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 “43-59” from the Jig RCU once again.

The FDP shows the EMG detail information <3> in the form of “*8 : *9 : *10”.

*8 : Previous deck operation mode at the moment of EMG *9 : The deck operation mode of the one before the last at

the moment of EMG

*10: The deck operation mode of the one prior to one

above at the moment of EMG

(5) Transmit the code “43-59” from the Jig RCU once again to

reset the display.

(1) Display the EMG history. (2) Transmit the code “43-36” from the Jig RCU. (3) Reset the EMG display.

• The display is variable depending on the part No. of the

System Control microcomputer (IC3001) built into the VCR. In the following, refer to the figure carrying the same two characters as the top two characters of the part number of your IC.

• The sensor information in the OSD display contents is

partially different from the mechanism sensor information in EMG detail information <1>.

AA BB CC DD EE

FF GG HH I I J J

KK L L MM NN OO

PP QQ RR SS TT

UU VV WW XX YY

(No.YD032)1-19

Page 20

AA : Deck operation mode (See EMG detail information <1>.) BB : Mechanism operation mode

(See EMG detail of information <1>.) CC : Mechanism transition flag DD : Capstan motor control status EE : Loading motor control status FF : Sensor information (See sensor information details.) GG : Capstan motor speed HH : Key code (JVC code) I I : Supply reel winding diameter data higher 8 bits. JJ : Supply reel winding diameter data lower 8 bits. KK : Mechanism sensor information & mechanism mode posi-

tion(See EMG detail of information <1>.) LL : Tape speed data higher 8 bits. MM : Tape speed data lower 8 bits. NN : Cassette tape type <2> higher 8 bits.

(See EMG detail of information <2>.) OO : Cassette tape type <2> lower 8 bits.

(See EMG detail of information <2>.) PP : General data display area

YY : General data display area

*FF:Sensor information details

** h

********

Encoder data

(See Mechanism mode sequence.) Cassette tab present = 1 Cassette tab broken = 0

Cassette absent = 1 Cassette present = 0

Start sensor

End sensor

[For *HD only]

** h

********

Encoder data (See Mechanism mode sequence.)

Remote pause

End sensor

Start sensor

Cassette tab present = 1 Cassette tab broken = 0

[For both MN*/HD*]

Mechanism mode sequence

Mechanism mode - Encoder data

LSA

LSB

LSC

LSD

No. Position Encoder data

Encoder output = Low

Trerminal - GND = SHORT

EJECT 0 h = 0000

EJECT1 1 h = 0001

EJECT2 2 h = 0010

ULSTOP 3 h = 0011

UPPER 4 h = 0100

ONSTOP(PLAY) 5 h = 0101

FWD/SS 6 h = 0110

REV/SS 7 h = 0111

OFFSTOP 8 h = 1000

FFREW-BRAKE 9 h = 1001

FFREW A h = 1010

MIDDLE F h = 1111

543

Encoder output = High

Trerminal - GND = OPEN

LSA

12345

1110

GND

9876

LSB

LSD

LSC

AA BB CC

DD EE FF

GGGG HHHH

I I JJJJ

KKKK LLLL MMMM

ROM No.

AA : Key code (JVC code) BB : Deck operation mode(See EMG detail information

<1>.)

CC : Mechanism operation mode (See EMG detail informa-

tion <1>.) DD : Sensor information (See sensor information details.) EE : Capstan motor speed (Search, double speed) FF : Tracking value GGGG : Cassette tape type <2>, 16 bits.

(See EMG detail information <2>.) HHHH : Supply reel winding diameter data I I : Capstan motor speed (FF/REW, double speed) JJJJ : Tape speed data, lower 8 bits. KKKK : General data display area LLLL : General data display area MMMM : General data display area

*DD:Sensor information details

1-20 (No.YD032)

Page 21

5.2.4 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

EU1: Head clog warning history

If the mechanism mode does not change to the next mode within 4 seconds after the loading motor starts rotating in the loading direction, while the mechanism is in the after-loading position (with the tape up against the pole base), [E:01] is identified and the power is switched OFF. However, if the tape loading is not completed within 4 seconds after the loading motor starts rotating in the loading direction, the tape is simply unloaded and ejected. No EMG data is recorded in this case.

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 falling edje of 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. In this case, however, the mechanism should be in position after tape loading. Note that the reel EMG is not detected during Slow/Frame advance operations.

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.

If the cassette does not reach the eject position within about 0.7 seconds after the cassette housing has started the cassette ejection operation, [E:05] is identified, the drive direction is reversed to load the tape, the mode is switched to STOP mode with the pinch roller OFF, and the power is switched OFF. During the cassette insertion process, the drive direction is reversed and the cassette is ejected if the tape is not up against the pole base within about 3 seconds after the start of the cassette pullingin operation. If the cassette does not reach the eject position within about 0.7 seconds after the drive mode reversal operation, [E:05] is identified and the power is switched 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 SLOW/ STILL modes. Note that, if the part number of the System Control IC begins with "MN" or "M3", the capstan EMG is not detected even during the FF/REW operation.

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 falling edge of 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). In this case, however, the mechanism should be in the position after tape loading (with the tape up against the pole base). Also note that the reel EMG is not detected during Slow/ Frame advance operations.

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:U1] is identified and recorded in the emergency history. During the period in which the head clog is detected, the FDP shows "U:01" and the OSD repeats the "3 seconds of warning display" and the "7 seconds of 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.

1. The mechanism is locked in the middle of the mode transition during a tape loading operation. The mechanism overruns during the tape loading operation because the SYSCON cannot recognize

2. the mechanism mode normally. This problem is due to a cause such as a rotary encoder failure.

Power is not supplied to the loading MDA. (M12V/Vcc/Vref/ICP are disconnected in the middle.)

The mechanism is locked in the middle of mode transition.

Without an eject signal being sent from the SYSCON, unloading is attempted (i.e. Ejection is attempted while the tape is still inside the mechanism.) because the SYSCON cannot recognize the mechanism mode normally. This is due to a cause such as a rotary encoder failure. (Mechanism position: UPPER)

Power is not supplied to the loading MDA. (M12V/Vcc/Vref/ICP are disconnected in the middle.)

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 because the mechanism mal-

functions for some reason.

The idler gear is meshed with the take-up reel gear, but incapable of winding due to

too large mechanical load (abnormal tension);

3)The reel is rotating normally but an FG pulse is not generated due to the take-up reel

sensor failure.

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 because the mechanism mal-

functions for some reason.

2) The idler gear is meshed with the supply reel gear, but incapable of winding due to

too large a mechanical load (abnormal tension);

3) The reel rotates normally but the FG pulse is not generated due to a supply reel

sensor failure.

Power(SW5V) is not supplied to the reel sensor on the tape winding side.

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 (M12V) 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 (M12V) 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 (occur-

rence 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 (M12V, SW5V) are 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 (5V) 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/FWD

1. SEARCH/FF, etc.) because;

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

the middle;

2) A mechanical factor caused tape slack inside and outside the supply reel side of the

cassette shell. In this case, the supply reel will not rotate until the tape slack is removed by the FWD transport, so the pulse is not generated until then;

3) The reel is rotating normally but the FG pulse is not generated due to a supply reel

sensor failure.

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 take up 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 reel is rotating normally but the FG pulse is not generated due to a take-up reel

sensor failure.

The power (SW 5V) to a reel sensor is not supplied.

(No.YD032)1-21

Page 22

5.2.5 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 display (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* and HD]

Display

MN* 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 (Normal playback) 0C 0E REC 10 11 Cassette ejected 20 22 FF 21 - Tape fully loaded, START sensor ON, short FF 22 -

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

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

Cassette identification FWD SEARCH before transition to FF (SPx7-speed)

(SPx7-speed)

Deck operation mode

*2 : Mechanism operation mode

[Table of MN*]

Display

00 Command standby (No command to be executed) 01 Immediate Power OFF after EMG occurrence 02 Loading from an intermediate position during mechanism initialization 03 Unloading due to EMG occurrence during mechanism initialization 04 Ejecting cassette (ULSTOP to EJECT) 05 Inserting cassette (EJECT to ULSTOP) 06 Loading tape (ULSTOP to PLAY) 07 Unloading tape (PLAY to ULSTOP) 08 Transition from pinch roller ON to STOP 09 Transition from pinch roller OFF to STOP (PLAY to OFFSTOP) 0A Transition from pinch roller OFF to STOP at power OFF 0B Transition from pinch roller ON to STOP at power ON 0C Transition to PLAY 0D Transition to Search FF 0E Transition to REC 0F Transition to FWD STILL/SLOW 10 Transition to REV STILL/SLOW 11 Transition to Search REV 12 Transition from FF/REW to STOP 13 Transition to FF 14 Transition to REW 15 Tape end detection processing during loading 16 Short FWD/REV at tape sensor ON during unloading 17 Transition to FF/REW brake mode

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 (Normal playback) 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

detection 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) FF Tape being unloaded

Mechanism operation mode

1-22 (No.YD032)

Page 23

3- : Mechanism sensor information

[Common table of MN* and HD*]

Display

REC safety SW

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

Tab broken = 0 Sensor ON = 0 Sensor ON = 0 Tab present = 1 sensor OFF = 1 Sensor OFF = 1

Mechanism sensor informatio n

Start sensor End sensor

OFF

OFF OFF

ON OFF OFF

ON OFF

ON OFF OFF OFF

Mechansim

position sensor

OFF

-4 : Mechanism mode position

[Common table of MN* and HD*]

Mechanism

sensor

information

Dis-

play

Deck operation mode

-0 Not established

-1 EJECT EJECT position

-2 EJECT-EJECT1 Intermodal position

-3 EJECT1 EJECT1 position

-4 EJECT1-EJECT2 Intermodal position

-5 EJECT2 EJECT2 position

-6 EJECT2-ULSTOP Intermodal position

Even number (0, 2, 4, 6, 8, A, C, E)

-7 ULSTOP ULSTOP position

-8 ULSTOP-UPPER Intermodal position

-9 UPPER Loading (unloading) tape

-A UPPER-ONSTOP Intermodal position

-B ONSTOP PLAY position

-C PLAY-FWD/SS Intermodal position

-D FWD/SS

FWD (FWD Still/Slow) position

-E FWD/SS-REV Intermodal position

-F REV

REV (REV Still/Slow) position

-0 REV-OFFSTOP Intermodal position

-1 OFFSTOP Pinch roller OFF position Odd number (1, 3, 5, 7, 9, B, D, F)

-2

OFFSTOP-FFREWB

Intermodal position

-3 FFREWB FF/REW Brake position

-4 FFREWB-FFREW Intermodal position

-5 FFREW FF/REW position

5.2.6 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> .

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 F1

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

Notes:

• Cassette tape type <1> is identified a few times during

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

• If other value than those listed in the above table is dis-

played, 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 21 sections using a hex number from “00” to “14”.

00 : End of winding 14 : Beginning of winding FF : Tape position not identified

*7 : Cassette tape type <2> (Winding area)

Display

00 04 - 08 05 - 06 05 - 0C 06 - 0C 06 - 0C 07 - 08 09 - 0B 0C - 0D 0D - 0F 0E - 10 10 - 12 10 - 13 11 - 14 12 - 14 13 - 14 13 - 14 13 - 14 13 - 14 15 - 16 16 - 17 17 - 18 19 - 1B

Cassette tape type <2>

Cassette type not identified C cassette, thick tape TC-10 Small reel, thick tape T-20 C cassette, thick tape TC-20P C cassette, thin tape TC-40 C cassette, thin tape TC-30 Small reel, thick tape T-40 Small reel, thick tape T-60 Small reel, thick tape T-80(DF-160) Small reel, thick tape T-90(DF-180) Small reel, thick tape T-100 Small reel, thin tape T-140 Small reel, thick tape T-120(DF-240) Small reel, thick tape T-130 Small reel, thin tape T-160 Small reel, thin tape T-210(DF-420) Small reel, thin tape T-180(DF-360) Small reel, thin tape T-168 Small reel, thick tape DF-300 Large reel T-20 Large reel T-30 Large reel T-40 Large reel T-60

(Reference) Word data (Beginning) (End)

(0497 - 0506) (0732 - 0858)

(05A9 - 0661) (0599 - 05FF) (0AA1 - 0C07) (0623 - 063D) (0C41 - 0CC3)

(0611 - 0638) (0C0C - 0CB2)

(07CC - 08E5) (09FD - 0B78) (0C20 - 0DFC) (0D31 - 0F3E)

(0E43 - 107F)

(10E1 - 120C)

(1073 - 1313)

(1185 - 1429)

(12D3 - 141F)

(1373 - 14C3)

(1357 - 14C0)

(1395 - 14EE)

(13A8 - 14CE)

(1536 - 1618)

(1647 - 175A)

(1759 - 189C)

(1989 - 1B2F)

Note:

• The values of cassette tape type <2> in the above table

are typical values with representative cassette tapes.

5.2.7 EMG detail information <3>

Three deck operation modes preceding the deck operation mode in which the EMG occurs may be confirmed based on the figures in the EMG information detail <3>. For the contents of the displayed information, see the table "Deck operation mode" in section "5.2.5 EMG detail information <1>".

(No.YD032)1-23

Page 24

Victor Company of Japan, Limited AV & MULTIMEDIA COMPANY DIGITAL VIDEO STORAGE CATEGORY 12, 3-chome, Moriya-cho, kanagawa-ku, Yokohama, kanagawa-prefecture, 221-8528, Japan

(No.YD032)

Printed in Japan

VPT

JVC HM-DH5US, HM-DT100US Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1.1 SAFTY PRECAUTIONS

2.1 Service position

2.2 Jig RCU mode

2.3 Mechanism service mode

2.4 Maintenance and inspection

3.1 Removing the major parts

4.1 Before adjustment

4.2 Mechanism compatibility adjustment

4.3 Electrical adjustment

5.1 Manually removing the cassette tape

5.2 Emergency display function