Jvc Hm-dh40000k User manual

SERVICE MANUAL

2003/8

D-VHS DIGITAL RECORDER

8298820038HM-DH40000K

Regading service information other than these sections, refer to the service manual No. 82933 (HM-DH40000U).

Also, be sure to note important safety precautions provided in the service manual.

SPECIFICATION

START STOP DATE

PLAY

REW

REC

STOP

PAUSE

TV/VCR CH

C. RESET

CANCEL

DBS DAILY

WEEKLY

ENTER

REC

LINK

REC

SPEED

SKIP

NAVI

SUBTITLE

VCR

PROGRAM PROG.CHECK TIMER

A/B/C/D

TV/VCR

CABLE

/DBS

POWER

REMOTE

CODE

., ? ABC DEF

GHI JKL MNO

PQRS TUV WXYZ

AUX

VOL

OSD

ENTER

MTP

NTSC

HM-DH40000K D2D4

(No.82988)

AV & MULTIMEDIA COMPANY VIDEO RECORDER CATEGORY 12, 3-chome, Moriya-cho, kanagawa-ku, Yokohama, kanagawa-prefecture, 221-8528, Japan

VICTOR COMPANY OF JAPAN, LIMITED

WPC

Printed in Japan

DIFFERENCE LIST

DIFFERENT TABLE OF FEATURE

The following table indicates main different points between models HM-DH40000U and HM-DH40000K

DIFFERENT TABLE OF PARTS LIST

The following table indicate different parts number between models HM-DH40000U and HM-DH40000K.

PACKING AND ACCESSORY ASSEMBLY<M1>

FINAL ASSEMBLY<M2>

DIGITAL BOARD ASSEMBLY<50>

TERMINAL SUB BOARD ASSEMBLY<52>

Note :

Mark - is not used.

Mark * reference model was also changed.

Mark ←is same as left.

ITEM HM-DH40000U HM-DH40000K

POWER VOLTAGE 120V / 60Hz 110V / 60Hz

D-VHS CLEANING TAPE PROVIDED OPTIONAL

INSTRUCTION / LANGUAGE ENGLISH, FRENCH KOREAN

D THEATER REGION 1 REGION 3

VCR PLUS+ VCR+ C3 NOT USED

CABLE BOX or DBS.BOX CTL USED NOT USED

TITLE DOWNLOAD USED NOT USED

REF NO. ITEM HM-DH40000U HM-DH40000K

301 PACKING CASE LP31128-001B LP31128-014A

310 INST.BOOK(ENGLISH) LPT0698-001B -

310 INST.BOOK(FRENCH) LPT0698-002B -

310 INST.BOOK(KOREAN) - LPT0859-001A

315 LED CABLE ASSY QAL0095-004 -

318 REGIST.CARD BT-51028-2 -

320 CLEANING TAPE QAM0492-001 -

321 WARRANTY CARD - BT-56013-1

REF NO. ITEM HM-DH40000U HM-DH40000K

501 FRONT PANEL ASSY LP10437-001D LP10437-007A

510 TOP COVER PQ11922-52-13 *PQ11922-66

513 STICKER(TOP) LP31153-001A -

REF NO. ITEM HM-DH40000U HM-DH40000K

PW1 DIGITAL BOARD ASSY LPA10175-01D or LPA10175-01E LPA10175-05A

IC901 IC PDI1394P23BD or TSB41AB2PAP TSB41AB2PAP

C908 C CAPACITOR NOT USED or NCB31CK-104X NCB31CK-104X

REF NO. ITEM HM-DH40000U HM-DH40000K

PW1 TERMINAL SUB BOARD ASSY LPA10176-01A4 LPA10176-04A4

TB1 TERMINAL BOARD ASSY LP31132-001B LP31132-004A

SERVICE MANUAL

2003/06

D-VHS DIGITAL RECORDER

82933200306 HM-DH40000U

SPECIFICATION

GENERAL

VIDEO/AUDIO (D-VHS)

VIDEO/AUDIO (S-VHS/VHS)

TUNER

TIMER

CONNECTOR

ACCESSORIES

START STOP DATE

PLAY

REW

REC

STOP

PAUSE

TV/VCR CH

C. RESET

CANCEL

DBS DAILY

WEEKLY

ENTER

REC

LINK

REC

SPEED

SKIP

NAVI

SUBTITLE

VCR

PROGRAM PROG.CHECK TIMER

A/B/C/D

TV/VCR

CABLE

/DBS

POWER

REMOTE

CODE

. , ? ABC DEF

GHI JKL MNO

PQRS TUV WXYZ

AUX

VOL

OSD

ENTE

MTP

NTSC

Power requirement AC 120 V~, 60 Hz

Power consumption

Power on 42 W

Power off 18 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 x H x D) 435 mm x 94 mm x 383 mm

(17-3/16" x 3-3/4" x 15-1/8")

Weight 5.5 kg (12.2 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

D-VHS (LS5) 2100 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 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)

3.33 mm/sec (LS5 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)

2.8 Mbps (LS5 mode)

Interface IEEE1394 compliant DTCP digital copy

protection compatible

Format S-VHS/VHS NTSC standard

Signal system NTSC-type color signal and

EIA monochrome signal, 525 lines/60 fields

Recording/Playback

system DA-4 (Double Azimuth) head helical scan

system

Signal-to-noise ratio 45 dB

Frequency range

Normal audio 70 Hz to 10,000 Hz

Hi-Fi audio 20 Hz to 20,000 Hz

Tuning system Frequency-synthesized tuner

Channel coverage VHF Channels 2-13

UHF Channels 14-69

CATV 113 Channels

Clock reference Quartz

Program capacity 1-year programmable timer/24 programs

Memory backup time Approx. 10 min.

Input/Output i.LINK IN/OUT (DV IN) x 2 (4-pin, S400)

RCA connectors (IN x 3, OUT x 2)

S-video connectors (IN x 3, OUT x 2)

Component video OUT (Y, PB/CB, PR/CR) x 1

Digital OUT (optical) x 1

Provided accessories Infrared remote control unit, “AA” battery x 2,

Audio cable, RF cable (F-type),

S-video cable (4-pin), Controller

D2D4

1-2 (No.82933)

TABLE OF CONTENTS

1 PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3

1.1 SAFTY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3

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

2.1 Disassembly flow chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5

2.2 How to read the disassembly and assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5

2.3 Disassembly/assembly method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5

2.4 Service position. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-9

2.5 Mechanism service mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-10

2.6 Jig RCU mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-10

2.7 Opening on the chassis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-10

2.8 Emergency display function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-11

3 MECHANISM ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-15

3.1 Before starting repair and adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-15

3.2 Replacement of major parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-19

3.3 Compatibility adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-28

4 ELECTRICAL ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-31

4.1 Precaution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-31

4.2 Servo circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-32

4.3 Audio circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-34

4.4 Digital circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-34

CHARTS AND DIAGRAMS

BOARD INTERCONNECTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3

SW.REG AND MAIN (REG) SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5

MAIN (VIDEO/AUDIO) SCHEMATIC DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7

MAIN (SYNC DET) SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-9

MAIN (S-SUB) SCHEMATIC DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11

MAIN (FMA/DEMOD) SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-13

MAIN (SYSCON) SCHEMATIC DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-15

MAIN (TUNER) SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-17

MAIN (TERMINAL) AND TERMINAL SUB SCHEMATIC DIAGRAMS. . . . . . . . . . . . . . . . . . . . . . . .2-19

RESET SW,REC SAFETY/D.CASS SW,DISPLAY AND JACK SCHEMATIC DIAGRAMS . . . . . . . .2-21

PRE/REC SCHEMATIC DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-23

DIGITAL(SUB CPU) SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-25

DIGITAL(DMAIN) SCHEMATIC DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-27

DIGITAL(DMAIN IF) SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-29

DIGITAL(E5) SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-31

DIGITAL(E5 DDR) SCHEMATIC DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-33

DIGITAL(MEMORY) SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-35

DIGITAL(DIGITAL IF) SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-37

DIGITAL(VIDEO) SCHEMATIC DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-39

DIGITAL(AUDIO) SCHEMATIC DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-41

SW.REG, DISPLAY, REC SAFETY, JACK AND TERMINAL SUB CIRCUIT BOARDS. . . . . . . . . . .2-43

MAIN CIRCUIT BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-45

COMPONENT PARTS LOCATION GUIDE <MAIN> LPB10177-001C. . . . . . . . . . . . . . . . . . . . . . . .2-47

PRE/REC CIRCUIT BOARD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-48

COMPONENT PARTS LOCATION GUIDE <PRE/REC> LPB10174-001B . . . . . . . . . . . . . . . . . . . .2-48

DIGITAL CIRCUIT BOARD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-49

COMPONENT PARTS LOCATION GUIDE <DIGITAL> LPB10175-001B . . . . . . . . . . . . . . . . . . . . .2-51

REMOTE CONTROLLER SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-53

FDP GRID ASSIGNMENT AND ANODE CONNECTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-53

CPU PIN FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-54

VOLTAGE CHARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-55

WAVEFORMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-56

VIDEO BLOCK DIAGRAM (1). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-57

VIDEO BLOCK DIAGRAM (2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-59

AUDIO BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-61

SYSTEM CONTROL BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-63

D-VHS BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-65

PARTS LIST

1. EXPLODED VIEW

1.1 PACKING AND ACCESORY ASSEMBLY<M1> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1

1.2 FINAL ASSEMBLY<M2>. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2

1.3 MECHANISM ASSEMBLY<M4> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4

2. PARTS LIST

SWITCHING REGULATOR BOARD ASSEMBLY<01>. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6

MAIN BOARD ASSEMBLY<01> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-7

A/C HEAD BOARD ASSEMBLY<12> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-13

DISPLAY BOARD ASSEMBLY<28> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-13

REC SAFETY BOARD ASSEMBLY<32> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-13

JACK BOARD ASSEMBLY<36> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-14

PRE/REC BOARD ASSEMBLY<43>. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-14

DIGITAL BOARD ASSEMBLY<50>. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-16

TERMINAL SUB BOARD ASSEMBLY<52> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-24

LOADING MOTOR BOARD ASSEMBLY<55> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-24

(No.82933)1-3

SECTION 1

PRECAUTIONS

1.1 SAFTY PRECAUTIONS

Prior to shipment from the factory, JVC products are strictly in-

spected to conform with the recognized product safety and elec-

trical 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 com-

pliance 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.

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.

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 volt-

age circuits, and related circuits are specified for compliance

with recognized codes pertaining to X-ray emission. Conse-

quently, when servicing these products, replace the cathode

raytubesand otherpartswithonlythespecifiedparts.Under

no circumstances attempt to modify these circuits.Unautho-

rized modification can increase the high voltage value and

cause X-ray emission from the cathode ray tube.

(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 trans former primary lead wires are performed using

crimp type connectors, if replacing the connectors is un-

avoidable, in order to prevent safety hazards, perform care-

fully 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).

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.

Fig.1-1-4

c) Align the lengths of thewires to be connected. Insert

the wires fully into the connector.

Fig.1-1-5

d) Asshown in Fig.1-1-6, use thecrimping tool tocrimp

the metal sleeve at the center position. Be sure to

crimp fully to the complete closure of the tool.

Fig.1-1-6

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

Fig.1-1-7

Power cord

cut close to connector

15 mm

Connector

Metal sleeve

1.25

2.0

5.5

Crimping tool

Not easily pulled free Crimped at approx. cente

of metal sleev

Conductors extended

Wire insulation recessed

more than 4 mm

1-4 (No.82933)

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 compli-

ance with safety standards.

(1) Insulation resistance test

Confirm the specified insulation resistance or greater be-

tween power cord plug prongs and externally exposed

parts of the set (RF terminals, antenna terminals, video and

audio input and output terminals, microphone jacks, ear-

phone 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 spec-

ified clearance distance (d), (d') between soldered termi-

nals, and between terminals and surrounding metallic

parts. See Fig.1-1-11 below.

Fig.1-1-8

(4) Leakage current test

Confirm specified or lower leakage current between earth

ground/power cord plug prongs and externally exposed ac-

cessible parts (RF terminals, antenna terminals, video and

audio input and output terminals, microphone jacks, ear-

phone 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.

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.

Fig.1-1-10

Fig.1-1-11

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.

Externally

exposed

accessible part

(No.82933)1-5

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1 Disassembly flow chart

This flowchart lists the disassembling steps for the cabinet parts

and P.C. boards in order to gain access to item(s) to be serviced.

When reassembling, perform the step(s) in reverse order. Bend,

route and dress the flat cables as they were originally laid.

2.2 How to read the disassembly and assembly

(1) Order of steps in Procedure

When reassembling, perform the step(s) in the reverse or-

der.

These numbers are also used as the identification (loca-

tion) 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

assigned nos. in priority order and do not corre-

spond to those on the spare parts list.

(5) Adjustment information for installation

2.3 Disassembly/assembly method

Top cover, Bracket

Front panel assembly

Switching regulator board assembly

Digital board assembly

PRE/REC board assembly

Drum assembly

Mechanism assembly

REC safety board assembly,

Display board assembly,

Jack board assembly

Main board assembly

Bottom cover

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

[10]

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

Step/

Loc No.

Part Name Fig.

No. Point Note

[1] Top cover, D1

4(S1a),(S1b),3(L1a), <Note 1a>

2(SD1a),(P1a),(W1a),

CN1(WR1a),

Bracket 2(S1c)

[1] Top cover, Bracket D1

4(S1a), (S1b), 2(S1c)

[2] Front panel assembly D2 CN901(WR2a),

4(L2a), 2(L2b),

3(L2c)

[3] Switching regulator

board assembly

D3 CN5303(WR3a),

CN5301

CN5305

3(S3a)

[4]

Digital board assembly

D4 CN401(WR4a),

CN402(WR4b),

CN8003(WR4c),

CN9301(WR4d),

CN9001(WR4e),

CN8001(WR4f),

CN8002(WR4g)

3(S4a), (S4b),

[5] PRE/REC board

assembly

D5 (S5a), (S5b),

L5a(WR5a),

Shield case(PRE),

CN604(WR5b),

CN603

[6] Drum assembly, D6 CON1(WR6a), <Note 2a>

CN1(WR6b),

(S6a), (S6b), (S6c)

(Inertia plate), 4(L6a)

(Roller arm assembly),

(P6a), (L6b)

(Cleaner assembly) (L6c)

[7] Mechanism assembly D7 CN1(WR7a), (S7a),

(S7b), (S7c), (S7d),

S7e(WR7b), 2(L7a)

[8] REC safety board

assembly,

D8 (S8a) <Note 2a>

CN7002(WR8a),

CN7005(WR8b)

4(L8a)

[9] Main board assembly D9 2(S9a)

[10] Bottom cover D10 (S10a), 2(S10b),

4(L10a), 3(L10b)

Step/

Loc No.

Part Name Fig.

No. Point Note

Display board assembly

1-6 (No.82933)

• 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 wire direction.

• When reattaching the Front panel assembly, make sure that

the door opener “a” of the Cassette holder assembly is low-

ered in position prior to the reinstallation.

• When securing the screw (S5a), be sure to connect the lug

wire (WR5a) together it.

• When installing the drum assembly, secure the screws (S6a

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

• When it is required to remove the screws (S7a to S7b) re-

taining the Mechanism assembly, please refer to the “Proce-

dures for Lowering the Cassette holder assembly” (See on

page 1-6).

• 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 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.

• After removing the REC safety board assembly, remove the

display board assembly.

Fig.Procedures for Lowering the Cassette holder assembly

Fig.D1

Fig.D2

Fig. 1

Fig. 2

Fig. 3

(A)

(B)

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.

Turn the loading motor pulley in the direction as indicated by

Fig.2. As both (A) and (B) levers are lodged twice, push

thelevers 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

untilthe cassette holder is securely in place without allowing

any up/down movement.

(S1c)

(S1b)

(S1a)

(S1a) [1] Top cover

[1] Bracket

(L2b)

(L2a)

(L2b)

(L2a)

(

WR2a

)

[2] Front panel

assembly

(L2c)

(No.82933)1-7

Fig.D3

Fig.D4

Fig.D5

Fig.D6

WR3a

(S3a)

CN5303

CN5301

CN5305

[3]

Switching regulator

board assembly

(S4b)

WR4e

<Note 2a> WR4a

WR4d

WR4c

CN9301

CN401

CN9001

CN8002

CN8001

CN402

CN8003

(S4a)

WR4a

WR4b

[4]Digital board assembly

(WR4f)

(WR4g)

WR5b

CN604

CN603

(CN3011)

(S5b)

WR5a

(S5a)

(L5a)

Shield case (PRE)

[5]

PRE/REC

board assembly

CN1

CON1

WR6a

WR6b

Roller arm

assembly Cleaner assembly

Inertia plate

(L6c)

(L6a)

(P6a)

(L6b)

(S6a)

(S6c)

(S6b)

[6]Drum assembly

Note :

When installing Drum assembly,

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

1-8 (No.82933)

Fig.D7

Fig.D8

Fig.D9

Fig.D10

WR7b

(S7c)

(S7e)

(L7a)

Spacer

(L7a)

Spacer

Q3003

End sensor

Q3002

Start sensor

S3002

S cassette switch

D3001

LED

WR7a

CN1

[7] Mechanism

assembly

(S7d)

(S7a)

(S7b)

Note :

When installing the Mechanism assembly,

secure the screws (S7a to S7b) in order of a, b.

(L8a)

(S8a)

REC safety

board assembly

[8] Display board assembly

WR8a

WR8b

CN7002 CN7005

(S9a)

[9] Main board assembly

(L10a)

(L10b)

(S10b) (S10a)

[10]

Bottom cover

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