JVC HMDH-3000 Service manual

SERVICE MANUAL

D-VHS DIGITAL RECORDER

JVC SERVICE & ENGINEERING COMPANY OF AMERICA

DIVISION OF JVC AMERICAS CORP.

Head office East Coast Midwest West Coast Atlanta Hawaii

1700 Valley Road Wayne, New Jersey 07470-9976

10 New Maple Avenue Pine Brook, New Jersey 07058-9641

705 Enterprise Street Aurora, Illinois 60504-8149

5665 Corporate Avenue Cypress, California 90630-0024

1500 Lakes Parkway Lawrenceville, Georgia 30043-5857

2969 Mapunapuna Place Honolulu, Hawaii 96819-2040

(973)315-5000 (973)396-1000 (630)851-7855 (714)229-8011 (770)339-2582 (808)833-5828

JVC CANADA INC.

Head office Montreal Vancouver

21 Finchdene Square Scarborough, Ontario M1X 1A7

16800 Rte Trans-Canadienne, Kirkland, Quebec H9H 5G7

13040 Worster Court Richmond, B.C. V6V 2B3

(416)293-1311 (514)871-1311 (604)270-1311

S40895-03

HM-DH30000U

SPECIFICATIONS

GENERAL

Power requirement : AC 120 V`, 60 Hz Power consumption

Temperature

Operating position : Horizontal only Dimensions (W x H x D) : 435 mm x 105 mm x 383 mm

Weight : 5.7 kg (12.6 lbs) Maximum recording time

VIDEO/AUDIO (D-VHS)

Video format : MPEG2 standard Audio format : Encode MPEG1 Layer2

Track composition

No. 82894

Recording specification

Interface : IEEE1394 compliant

HM-DH30000U

A.MONITOR

VCR TVCABLE/DBS

POWER

A/B DISPLAY

TV/VCR

ENTER/OSD

123

. , ?

ABC DEF

456

GHI JKL MNO

DBS

DAILY(M-F)

WEEKLY

PQRS TUV WXYZ

C. RESET

AUX

CANCEL

TIMER

START STOP DATE

EXPRESS PROGRAMMING

PROG.

HS/STD/LS3

SKIP SEARCH

PROG.

CHECK

SP/EP

BACK

PLAY

F F

REW

STOP

P A

TV CH +

VOL

–

TV CH –

JOG/

SHUTTLE

POWER

PULL-OPEN

Power on : 55 W Power off : 18 W

Operating : 5°C to 40°C (41°F to 104°F) Storage : –20°C to 60°C (–4°F to140°F)

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

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

Decode MPEG1 Layer2

Dolby Digital

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

Main data input rate : 28.2 Mbps (HS mode)

14.1 Mbps (STD mode)

4.7 Mbps (LS3 mode)

DTCP digital copy protection compatible

REC LINK

TIMER STOP/EJECT PLAY

MTP NTSC

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 :

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

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. 60 min.

CONNECTORS

Input/Output : i.LINK IN/OUT, DV IN x 2 (4-pin, S200)

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

ACCESSORIES

Provided accessories :

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

Audio cable, RF cable (F-type),

S-video cable (4-pin), Controller

䡲 Manufactured under license from Dolby Laboratories.

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

Printed in Japan

This service manual is printed on 100% recycled paper.

No. 82894

August 2001

TABLE OF CONTENTS

Section Title Page Section Title Page

Important Safety Precautions

INSTRUCTIONS

1. DISASSEMBLY

1.1 Disassembly flow chart ................................................................ 1-1

1.2 How to read the disassembly and assembly ................................ 1-1

1.3 Disassembly/assembly method.................................................... 1-1

1.4 Service position ............................................................................ 1-5

1.4.1 How to set the “Service position” ........................................... 1-5

1.4.2 Precautions for cassette loading in the “Service position” ..... 1-5

1.4.3

Cassette loading and ejection methods in the “Service position”

1.5 Mechanism service mode ............................................................ 1-6

1.5.1 How to set the “Mechanism service mode” ............................ 1-6

1.6 Jig RCU mode ............................................................................. 1-6

1.6.1 Setting the Jig RCU mode ..................................................... 1-6

1.6.2 Setting the User RCU mode .................................................. 1-6

1.7 Opening on the chassis ................................................................ 1-6

1.8 Emergency display function ......................................................... 1-7

1.8.1 Displaying the EMG information ............................................. 1-7

1.8.2 Clearing the EMG histor y ....................................................... 1-7

1.8.3 EMG content description ........................................................ 1-8

1.8.4 EMG detail information <1> ................................................... 1-9

1.8.5 EMG detail information <2> ................................................. 1-10

2. MECHANISM ADJUSTMENT

2.1 Before starting repair and adjustment ......................................... 2-1

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

2.1.2 Checking for proper mechanical operations ........................... 2-1

2.1.3 Manually removing the cassette tape ..................................... 2-1

2.1.4 Jigs and tools required for adjustment ................................... 2-2

2.1.5 Maintenance and inspection .................................................. 2-3

2.2 Replacement of major parts ......................................................... 2-6

2.2.1 Before starting disassembling (Phase matching between

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

2.2.2 How to set the “Mechanism assembling mode” ..................... 2-6

2.2.3 Cassette holder assembly ...................................................... 2-6

2.2.4 Pinch roller arm assembly...................................................... 2-8

2.2.5 Guide arm assembly and press lever assembly ..................... 2-8

2.2.6 A/C head ................................................................................ 2-8

2.2.7 Loading motor ........................................................................ 2-8

2.2.8 Capstan motor ....................................................................... 2-9

2.2.9 Pole base assembly (supply or take-up side) ......................... 2-9

2.2.10 Rotary encoder .................................................................. 2-10

2.2.11 Clutch unit .......................................................................... 2-10

2.2.12

Change lever assembly, direct gear, clutch gear and coupling gear..

2.2.13 Link lever ............................................................................ 2-11

2.2.14 Cassette gear, control cam and worm gear ....................... 2-11

2.2.15 Control plate ....................................................................... 2-11

2.2.16 Loading arm gear (supply or take-up side) and

loading arm gear shaft ....................................................... 2-12

2.2.17 Take-up lever, take-up head and control plate guide .......... 2-13

2.2.18 Capstan brake assembly .................................................... 2-13

2.2.19 Sub brake assembly (take-up side) .................................... 2-13

2.2.20

Main brake assembly (take-up side), reel disk (take-up side) and

main brake assembly (supply side) ................................................

2.2.21 Tension brake assembly, reel disk (supply side) and

tension arm assembly ........................................................ 2-14

2.2.22 Idler lever, idler arm assembly ........................................... 2-14

2.2.23 Stator assembly .................................................................. 2-14

2.2.24 Rotor assembly .................................................................. 2-14

2.2.25 Upper drum assembly ........................................................ 2-15

2.3 Compatibility adjustment ............................................................ 2-16

2.3.1 FM waveform linearity .......................................................... 2-16

2.3.2 Height and tilt of the A/C head ............................................. 2-17

2.3.3 A/C head phase (X-value) .................................................... 2-17

2.3.4 Standard tracking preset ...................................................... 2-18

2.3.5 Tension pole position............................................................ 2-18

3. ELECTRICAL ADJUSTMENT

3.1 Precaution ................................................................................... 3-1

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

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

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

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

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

3.2 Servo circuit ................................................................................. 3-2

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

3.2.2 D-VHS switching point ........................................................... 3-2

3.2.3 Slow tracking preset ............................................................... 3-2

1-5

2-10

2-13

3.3 Video circuit .................................................................................. 3-3

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

3.3.2 EE Y/PB Y (S-VHS/VHS) level ............................................... 3-3

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

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

3.3.5 Auto picture initial setting ....................................................... 3-4

3.4 Audio circuit .................................................................................. 3-4

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

3.5 Demodulator circuit ...................................................................... 3-5

3.5.1 Input level ............................................................................... 3-5

3.5.2 Stereo VCO ............................................................................ 3-5

3.5.3 Stereo filter ............................................................................. 3-5

3.5.4 Separation - 1 ......................................................................... 3-6

3.5.5 Separation - 2 ......................................................................... 3-6

3.5.6 SAP VCO ............................................................................... 3-6

3.6 Digital circuit ................................................................................. 3-6

3.6.1 D-VHS REC level ................................................................... 3-6

3.6.2 PLL f0 ..................................................................................... 3-7

4. CHARTS AND DIAGRAMS

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

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

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

4.2

REGULATOR AND SUB REGULATOR SCHEMATIC DIAGRAMS ......

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

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

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

4.6 MAIN (AUDIO I/O) SCHEMATIC DIAGRAM .............................. 4-13

4.7 MAIN (SYNCDET) SCHEMATIC DIAGRAM .............................. 4-15

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

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

4.10 TERMINAL-NTSC SCHEMATIC DIAGRAM............................. 4-21

4.11 S-SUB SCHEMATIC DIAGRAM............................................... 4-23

4.12 DISPLAY, REC SAFETY/D.CASS SW AND

JACK SCHEMATIC DIAGRAMS .............................................. 4-25

4.13 D-PRE/REC SCHEMATIC DIAGRAM ...................................... 4-27

4.14 DIGITAL(HOST) SCHEMATIC DIAGRAM ................................ 4-29

4.15 DIGITAL(DMAIN) SCHEMATIC DIAGRAM .............................. 4-31

4.16 DIGITAL(D-VHS IF) SCHEMATIC DIAGRAM .......................... 4-33

4.17 DIGITAL(DVX) SCHEMATIC DIAGRAM ................................... 4-35

4.18 DIGITAL(VIDEO IF) SCHEMATIC DIAGRAM .......................... 4-37

4.19 DIGITAL(HD DEC) SCHEMATIC DIAGRAM ............................ 4-39

4.20 DIGITAL(LAPRAS) SCHEMATIC DIAGRAM............................ 4-41

4.21 DIGITAL(DSP) SCHEMATIC DIAGRAM .................................. 4-43

4.22 DIGITAL(AUDIO AD/DA) SCHEMATIC DIAGRAM ................... 4-45

4.23 DIGITAL(DECRIPTER) SCHEMATIC DIAGRAM ..................... 4-47

4.24 REGULATOR AND SUB REGULATOR CIRCUIT BOARDS .... 4-49

4.25 3D DIGITAL/4M AND S-SUB CIRCUIT BOARDS.................... 4-51

4.26 TERMINAL CIRCUIT BOARD .................................................. 4-52

4.27 DISPLAY, REC SAFETY AND JACK CIRCUIT BOARDS ........ 4-53

4.28 D-PRE/REC CIRCUIT BOARD ................................................ 4-55

4.29 DIGITAL CIRCUIT BOARD ...................................................... 4-57

4.30 MAIN CIRCUIT BOARD ........................................................... 4-61

4.31 VOLTAGE CHARTS .................................................................. 4-64

4.32 FDP GRID ASSIGNMENT AND ANODE CONNECTION ........ 4-65

4.33 REMOTE CONTROLLER SCHEMATIC DIAGRAM ................. 3-66

4.34 WAVEFORMS .......................................................................... 4-67

4.35 CPU PIN FUNCTION ............................................................... 4-68

4.36 SYSTEM CONTROL BLOCK DIAGRAM ................................. 4-69

4.37 AUDIO BLOCK DIAGRAM ....................................................... 4-71

4.38 VIDEO BLOCK DIAGRAM ....................................................... 4-73

4.39 D-VHS BLOCK DIAGRAM ....................................................... 4-77

5. PARTS LIST

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

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

5.3 MECHANISM ASSEMBLY <M4> ................................................ 5-4

5.4 ELECTRICAL PARTS LIST .......................................................... 5-6

SW.REG BOARD ASSEMBLY <01> ................................................ 5-6

SUB REG BOARD ASSEMBLY <02> .............................................. 5-7

MAIN BOARD ASSEMBLY <03> ..................................................... 5-8

3D DIGITAL/4M BOARD ASSEMBLY <05> ................................... 5-14

TERMINAL BOARD ASSEMBLY <06> .......................................... 5-16

A/C HEAD BOARD ASSEMBLY <12> ........................................... 5-16

S-SUB BOARD ASSEMBLY <15> ................................................. 5-16

DISPLAY BOARD ASSEMBLY <28> .............................................. 5-17

REC SAFETY BOARD ASSEMBLY <32> ...................................... 5-18

JACK BOARD ASSEMBLY <36> ................................................... 5-18

D-PRE/REC BOARD ASSEMBLY <43> ......................................... 5-18

DIGITAL BOARD ASSEMBLY <50> ............................................... 5-22

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

4-5

Important Safety Precautions

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

Precautions during Servicing

•

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

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

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

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

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

4. Use specified internal wiring. Note especially:

1) Wires covered with PVC tubing

2) Double insulated wires

3) High voltage leads

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

1) Insulation Tape 3) Spacers 5) Barrier

2) PVC tubing 4) Insulation sheets for transistors

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

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

1) Connector part number : E03830-001

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

will not damage insulated parts.

3) Replacement procedure

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

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

cut close to connector

Fig.3

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

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

15 mm

Fig.1

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

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

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

Power cord

Fig.2

10. Also check areas surrounding repaired locations.

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

Fig.4

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

wires fully into the connector.

Metal sleeve

Connector

Fig.5

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

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

Fig.6

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

Not easily pulled free

Wire insulation recessed

more than 4 mm

Fig.7

Crimping tool

Crimped at approx. center

of metal sleeve

Conductors extended

S40888-01

Safety Check after Servicing

•

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

1. Insulation resistance test

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

2. Dielectric strength test

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

3. Clearance distance

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

Fig. 8

4. Leakage current test

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

Externally exposed accessible part

Fig. 9

5. Grounding (Class 1 model only)

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

Measuring Method:

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

Fig. 10

Table 1 Specifications for each region

Table 2 Leakage current specifications for each region

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

S40888-01

SECTION 1

DISASSEMBLY

1.1 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.

[1]

[2]

[3]

[4]

[5]

[6]

[7]

Top cover, Bracket

Front panel assembly

SW.REG board assembly

Digital board assembly

D-PRE/REC board assembly

Drum assembly

Mechanism assembly

REC safety board assembly,

[8]

Display board assembly,

Jack board assembly

[9]

[10]

1.2

How to read the disassembly and assembly

Main board assembly

Bottom cover

Step/

Loc No.

[1] Top cover, D1

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

Part Name

Bracket 2(S1c)

Fig. No.

Point Note

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

1.3 Disassembly/assembly method

Step/

Loc No.

[1] Top cover, D1

[2] Front panel assembly D2 CN8201(WR2a), <Note 2a>

[3] SW.REG board D3 CN5302(WR3a), <Note 2a>

[4]

[5] D-PRE/REC board D5 (S5a), L5a(WR5a), <Note 2a>

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

[7] Mechanism assembly D7 CN1(WR7a), (S7a), <Note 2a>

[8] REC safety board D8 (S8a) <Note 2a>

[9] Main board assembly D9 2(S9a)

[10] Bottom cover, D10

Part Name

Bracket 2(S1d)

assembly CN5502(WR3b),

Digital board assembly

assembly Shield case(PRE), <Note 5a>

(Inertia plate), 4(L6a) (Roller arm assembly), (Cleaner assembly) (L6c)

assembly, Display board assembly,

Jack board assembly CN7191(WR8b)

(Foot(2)), 4(L10a) (Foot assembly) 4(L10b)

Fig. No.

D4 CN601(WR4a), <Note 2a>

Point Note

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

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

2(S2a), 4(L2a), 2(L2b), 3(L2c)

CN5504(WR3c), CN5303(WR3d), CN5503(WR3e), 2(S3a)

CN603(WR4b), <Note 4a> CN8803(WR4c), CN9801(WR4d), CN8002(WR4e), 2(S4a), (S4b), Earth plate

CN606(WR5b), CN3011

CN1(WR6b), <Note 6a> (S6a), (S6b), (S6c)

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

(P6a), (L6b)

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

(S7b), (S7c), (S7d), <Note 7a> S7e(WR7b), 2(L7a)

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

CN7002(WR8a), <Note 8a> 4(L8a)

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

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

(S10a), 2(S10b), 4(L10c), 3(L10d)

(1) Order of steps in Procedure

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

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

released, unplugged, unclamped or unsoldered.

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

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

(CN**).

Note:

•

The bracketed ( ) WR of the connector symbol are assigned nos. in priority order and do not correspond to those on the spare parts list.

(5) Adjustment information for installation

1-1

• 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 lowered in position prior to the reinstallation.

• When securing the screw (S4b), be sure to attach the earth plate together it.

• 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) retaining the Mechanism assembly, please refer to the “Procedures for Lowering the Cassette holder assembly”(See on page 1-2).

• 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.

(S1a)

(S1d)

[1] Top cover

(S1c)

(S1b)

(S1d)

[1] Bracket

Fig. D1

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.

(A)

Fig. 1

(B)

Fig. 2

Fig. 3

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

(S2a)

(L2a)

(L2b)

(L2c)

[2] Front panel

assembly

(

WR2a

Detail C

)

CN8201

Detail B

(S2a)

(L2a)

Treatment of 1394 cable

Digital board assembly

Front panel assembly

Detail B

(L2b)

a <Note 2b>

Detail C

Display board assembly

1394 cable

Procedures for Lowering the Cassette holder assembly

1-2

Fig. D2

[3] SW. REG board assembly

CN5302

CN5504 CN5502

CN5503

CN5303

WR3a

(S3a)

WR3b

WR3e

(S3a)

WR3c

(S5a)

Shield case (PRE)

(L5a)

WR5a

[5] D-PRE/REC board assembly

WR5b

CN606

CN605

(CN3011)

Fig. D5

Note: When installing the Drum assembly, secure the screws (S6a to S6c) in the order of a, b, c.

Earth plate

CN8803

(S4a)

CN8002

CN9801

WR4d

Fig. D3

(S4b)

(WR4b)

(WR4a)

[4] Digital board assembly

WR4e

CN603

WR4c

CN601

(L6a)

Inertia plate

Roller arm assembly

[6] Drum assembly

Not used

Spacer

(P6a)

(L6b)

(S6a) <Note 6a>

(W6)

Not used

(S6c) <Note 6a>

CON1

Drum shield

(S6b)

WR6a <Note 2a>

(S6b) <Note 6a>

WR6b <Note 2a>

Cleaner assembly

(L6c)

Fig. D4

CN1

Fig. D6

1-3

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

(S9a)

(S7b)

Q3003 End sensor <Note 7a>

(L7a) Spacer <Note 7a>

D3001 LED <Note 7a>

(S7d)

(S7a)

S3002 S cassette switch <Note 7a>

Fig. D7

CN1

WR7a <Note 2a>

(S7e)

WR7b <Note 7b>

(S7c)

[7] Mechanism assembly

[9] Main board assembly

(L7a) Spacer <Note 7a>

Q3002 Start sensor <Note 7a>

Fig. D9

(L8a)

WR8b <Note 2a>

CN7191

[8] Jack board assembly

(S8a)

[8] REC safety board assembly <Note 8a>

(L8a)

CN7002

WR8a <Note 2a>

[8] Display board assembly

Foot assembly

(L10b)

(L10c)

[10] Bottom cover

(L10d)

(L10b)

(L10a)

(S10b)

Foot(2)

(L10c)

(L10a)

(S10a)

1-4

Fig. D8

Fig. D10

1.4 Service position

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

• 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.

1.4.1 How to set the “Service position”

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

assembly of the major parts before removing the D-PRE/ REC board assembly.

(2) Remove the screws attaching the mechanism assembly

with the chassis assembly. Remove the screws attaching the board assembly, if necessary.

(3) Remove the combined Mechanism and Main board as-

semblies.

(4) Connect the wires and connectors of the major parts that

have been removed in step (1). (Refer to Fig.1-4-1a.)

(5) Place the combined Mechanism and Main board assem-

blies upside down.

(6) Insert the power cord plug into the power outlet and then

proceed with the diagnostics and servicing of the board assembly.

Notes:

• Before inserting the power cord plug into the power outlet, 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 “1.3 Disassembly/assembly method”.

• 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.

1.4.2 Precautions for cassette loading in the “Service position”

The REC safety board assembly detects cassette loading as well as cassette tabs. Therefore, after the assembly has been removed in the “Service position”, it is required to set the switch manually on the REC safety board assembly when a cassette is loaded.

1.4.3 Cassette loading and ejection methods in the “Service position”

(1) Insert a cassette halfway in the Cassette holder assem-

bly.

(2) Set the switch on the REC safety board assembly to on

(by pressing the switch).

(3) As soon as the cassette starts to be loaded, set the

switch on the REC safety board assembly to off (by releasing the switch).

(4) Now the desired operation (recording, playback, fast for-

ward, rewind, etc.) is possible in this status.

(5) The switch on the REC safety board assembly does not

have to be operated when ejecting a tape. But be sure to turn the set to the normal position before ejecting the tape.

Note:

•

In the “Service position”, the cassette tabs cannot be detected and recording becomes possible even with a cassette with broken tabs such as the alignment tape. Be very careful not to erase important tapes.

Digital board assembly

CN8002

CN9801

Main TP106 PB-FM TP2253 A.PB-FM TP4001 CTL.P TP7101 Y OUT

D-PRE/REC TP111 Video/STD/HS1 FF TP112 A/HS2 FF TP601 REC level 1 TP602 REC level 2 TP606 PB data 1 TP616 PB data 2

CN8803

CN8801 CN8802

To D-PRE/REC

CN603 CN601

To Digital

CN8002

CN9801

CN7191

Jack board assembly

To Digital

CN8803

CN7107

TP7101

CP6201

CN3009

TP7001

(MECHA1)

CN901

CN7104

TP616 TP112

TP602 TP601 TP606 TP111

VR6601 Separation

TP7002

(MECHA2)

Fig. 1-4-1a

S-Sub board assembly

TP106 TP4001 TP2253

CN601CN603

D-PRE/REC board assembly

REC Safety board assembly

CP4001

CP3002

Display board assembly

Terminal board assembly

3D Digital/4M board assembly

Main board assembly

VR1401 D/A level

CN5601

CN7005

CN7002

CN3008

To Digital

CN8801 CN8802

CN5302

CN5303

CN5504 CN5502 CN5503

Sub Reg board assembly

SW. Reg board assembly

1-5

1.5 Mechanism service mode

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

1.5.1 How to set the “Mechanism service mode”

(1) Unplug the power cord plug from the power outlet. (2) Remove the front panel assembly. (3) Connect TP7001(MECHA 1) and TP7002(MECHA 2) on

the Display board assembly with a jump wire. (4) Insert the power cord plug into the power outlet. (5) With lock levers (A) (B) on the left and right of the Cas-

sette holder assembly pulled toward the front, slide the

holder in the same direction as the cassette insertion di-

rection. (For the positions of lock levers (A) (B), refer to

the “Procedures for lowering the Cassette holder assem-

bly” of 1.3 Disassembly/assembly method.) (6) The cassette holder lowers and, when the loading has

completed, the mechanism enters the desired mode.

1.6 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 serv-

icing.

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

1.7 Opening on the chassis

The chassis of this VCR has openings for diagnosis of some parts on the board assembly.

Reel sensor (Supply)

TU6001

CN3011

Reel sensor (Take-up)

Rotary encoder

IC3001

Fig. 1-7-1a

1.6.1 Setting the Jig RCU mode

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

VCR simultaneously, while plugging the power cord plug

into the power outlet.

When the VCR is set to the Jig RCU mode, the symbols

( “ : ” ) in the time display of the FDP are turned off.

1.6.2 Setting the User RCU mode

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

multaneously. Alternatively, transmit the code “80” from

the Jig RCU.

1-6

1.8 Emergency display function

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

FDP display model [FDP display]

0 : 00 : 00

E:** :**

*1 : *2 : 34

*5: *6 : *7

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

0: 00

E: **

1: **

2: *1

3: *2

4: 34

5: *5

6: *6

7: *7

OSD display model [OSD display]

Normal display

EMG content display (E:Latest:Previous)

EMG detail information <1>

EMG detail information <2>

Normal display

EMG content display (Latest)

EMG content display (Previous)

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

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

*5: *6 : *7

EMG content display (E:Latest:Previous)

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

Notes:

•

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

•

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

Jig RCU

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

CUSTOM CODE 43: A CODE 53: B CODE

DATA CODE

INITIAL MODE

Fig. 1-8a Jig RCU [PTU94023B]

1.8.1 Displaying the EMG information

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

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

<Example 1> E : 01 : 03

Previous EMG

Latest EMG

<Example 2> E : –– : ––

No EMG record

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

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

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

EMG

–4 : Mechanism mode position at the moment of EMG

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

The FDP shows the EMG detail information <2> in the form of “ *5 : *6 : *7 ”.

* 5 : Type of the cassette tape in use <1> . * 6 : Winding position of the cassette tape in use * 7 : Type of the cassette tape in use <2> (Winding area)

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

set the display.

Notes:

•

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

•

For the EMG content, see “1.8.3 EMG content description”.

•

For the EMG detail information <1> , see “1.8.4 EMG detail information <1> ”.

•

For the EMG detail information <2> , see “1.8.5 EMG detail information <2>”.

1.8.2 Clearing the EMG history

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

(EMG-02e)

1-7

1.8.3 EMG content description

Note:

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

FDP CONTENT CAUSE

E01: Loading EMG

E02:

Unloading EMG

E03: Take Up Reel

Pulse EMG

E04: Drum FG

EMG

E05: Cassette Eject

EMG

E06: Capstan FG

EMG

E07: SW Power

Short-Circuit EMG

E08:

DD Initialized (Absolute Position Sensor) EMG

E09: DD FG EMG

E0A:Supply Reel

Pulse EMG

EC1 or EU1: Head clog warning

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

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

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

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

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

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

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

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

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

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

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

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

The mechanism is locked in the middle of mode transition.

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

reading error during mode transition.

Power is not supplied to the loading MDA.

The mechanism is locked in the middle of mode transition.

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

Power is not supplied to the loading MDA.

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

1) The idler gear is not meshed with the take-up reel gear;

The idler gear is meshed with the take-up reel gear, but incapable of wind-

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

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

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

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

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

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

Power is not supplied to the reel sensors.

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

1) The tape tension is abnormally high;

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

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

1) The signal circuit is disconnected in the middle;

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

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

Power is not supplied to the drum MDA.

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

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

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

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

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

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

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

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

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

tape (occurrence of tape entangling, etc.).

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

1) The signal circuit is disconnected in the middle;

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

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

Power is not supplied to the capstan MDA.

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

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

1. The absolute value sensor is defective. (The soldered parts have separated.)

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

3. Contact failure or soldering failure of the pins of the connector (board-to-board) to the absolute value sensor.

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

1. The FG sensor is defective. (The soldered parts have separated.)

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

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

4. The power to the sensor is not supplied. (Connection failure/soldering failure)

5. The FG pulse is not sent to the System Controller CPU.

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

7. The drive power to the tilt motor is not supplied. (Connection failure/soldering failure)

8. The tilt motor drive MDA - IC is defective.

9. Auto-recovery of the DD tilting cannot take place due to overrun.

The supply reel pulse is not generated in the FWD transport mode (PLAY/ FWD SEARCH/FF, etc.) because;

1) PLAY/FWD or SEARCH/FF is started while the tape in the inserted cas-

sette is cut in the middle;

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

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

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

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

1) REV SEARCH/REW is started when the tape in the inserted cassette

has been cut in the middle;

2) A mechanical factor caused tape slack inside and outside the take-up

reel side of the cassette shell. In this case, the supply reel will not rotate until the tape slack is removed by the REV transport, so the pulse will not be generated until that time;

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

The power to a reel sensor is not supplied.

1-8

Table 1-8-3a

1.8.4 EMG detail information <1>

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

[FDP/OSD display]

* 1 : * 2 : 34

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

e position at the moment of EMG

Note:

•

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

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

Display

MN*/M3* HD*

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

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

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

8E - Forward spacing (FWD transport mode with BEST function) AC AF INSERT REC PAUSE AD - INSERT REC back spacing

CC CD AUDIO DUB PAUSE CD - AUDIO DUB back spacing

EC EF INSERT REC (VIDEO + AUDIO) PAUSE ED - INSERT REC (VIDEO + AUDIO) back spacing

x7-speed)

Deck operation mode

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

Display

MN* M3*

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

- 0A Mode transition to STOP with cassette ejection end 0A 0C Cassette insertion being executed 0C 0E Tape being loaded 0E 10 Tape being unloaded 10 12 Mode transition to STOP with pinch roller compression ON 12 14 Mode transition to STOP with pinch roller compression OFF 14 16

16 18

18 1A Mode transition to PLAY 1A 1C Mode transition to FWD SEARCH 1C 1E Mode transition to REC 1E 20 Mode transition to FWD STILL / SLOW 20 22 Mode transition to REV STILL / SLOW 22 24 Mode transition to REV SEARCH 24 26 Mode transition from FF / REW to STOP 26 28 Mode transition to FF 28 2A Mode transition to REW 2A 2C 4 sec. of REV as a result of END sensor going ON during loading 2C 2E 2E 30 Mechanism position being corrected due to overrun 80 80 Mechanism in initial position (Dummy command)

executed

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

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

Mechanism operation mode

[Table of HD*]

Display

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

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

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

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

roller pressure on)

Mechanism operation mode

1-9

3– : Mechanism sensor information [Common table of MN*, HD* and M3*]

Display

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

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

Mechanism sensor information

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

Display Mechanism mode position

MN* HD* M3*

-0 -7 - Initial value

-1 -0 - EJECT position

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

-2 -7 - Housing operating

- - -1 Between EJECT and U / L STOP

-3 -1 -2 U / L STOP position

- - -3 Guide arm drive position

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

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

-6 -7 -6 Pole base compressed position

-7 -3 -F FF / REW position

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

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

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

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

- - -D REV position

- - -C Between REV and REV STILL / SLOW

- - -B REV STILL / SLOW position

-C -7 - Between REV and FWD

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

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

- - -9 FWD STILL / SLOW position

-E -7 - Between FWD and PLAY

- - -8 Between FWD STILL / SLOW and PLAY

-F -6 -7 PLAY position

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

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

sion ON

REV

Note:

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

1.8.5 EMG detail information <2>

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

[FDP/OSD display]

*5 : *6 : *7

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

e cassette tape in use

<2>

(Winding area)

Note:

• EMG detail information <2> is the reference information stored using the remaining tape detection function of the cassette tape. As a result, it may not identify cassette correctly when a special cassette tape is used or when the tape has variable thickness.

* 5 : Cassette tape type <1>

Display Cassette tape type <1>

00 Cassette type not identified 16

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

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

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

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

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

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

Notes:

Cassette tape type

•

<1>

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

•

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

* 6 : Cassette tape winding position

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

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

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

Display Cassette tape type <2>

00 Cassette type not identified

07 Small reel, thick tape T-5 08 - 0E C cassette, thick tape TC-10 09 - 15 C cassette, thick tape TC-20P 0A - 0B Small reel, thick tape T-20 0A - 16 C cassette, thin tape TC-30 0A - 16 C cassette, thin tape TC-40 0D - 0F Small reel, thick tape T-40 11 - 14 Small reel, thick tape T-60 15 - 18 Small reel, thick tape T-80 / DF-160 17 - 1A Small reel, thick tape T-90 / DF-180 19 - 1D Small reel, thick tape T-100 1D - 21 Small reel, thick tape T-120 / DF-240 1E - 1F Small reel, thin tape T-140 1F - 23 Small reel, thick tape T-130 21 - 23 Small reel, thin tape T-160 21 - 23 Small reel, thin tape T-168 22 - 24 Small reel, thick tape DF-300 22 - 24 Small reel, thin tape T-180 / DF-360 22 - 24 Small reel, thin tape T-210 / DF-420 22 - 23 Large reel T-5 23 - 24 Large reel T-10 25 - 26 Large reel T-20 27 - 29 Large reel T-30 29 - 2B Large reel T-40 2D - 2F Large reel T-60

Note:

•

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

1-10

SECTION 2

Press

(C)

(A)

(B)

MECHANISM ADJUSTMENT

2.1 Before starting repair and adjustment

2.1.1 Precautions

(1) Unplug the power cord plug of the VCR before using your

soldering iron.

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

wires when plugging and unplugging the connectors.

(3) Do not randomly handle the parts without identifying

where the trouble is.

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

ing the repair work.

(5) When reattaching the front panel assembly, make sure

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

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

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

Loading motor

2.1.2 Checking for proper mechanical operations

Enter the mechanism service mode when you want to operate the mechanism when no cassette is loaded. (See SECTION 1 DISASSEMBLY.)

2.1.3 Manually removing the cassette tape

1. In case of electrical failures

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

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

assembly of the major parts before removing the drum assembly.

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

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

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

the position where it is hidden behind the cassette tape.

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

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

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

tape and the cassette lid.

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

pletes removal of the cassette tape.

Note:

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

Pole base assembly

Fig. 2-1-3a

Fig. 2-1-3b

2-1

2. In case of mechanical failure

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

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

panel assembly and others so that the mechanism assembly is visible. (See SECTION 1 DASASSEMBLY.)

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

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

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

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

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

2.1.3-1(5), remove the top guide.

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

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

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

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

Pole base assembly (take-up side)

2.1.4 Jigs and tools required for adjustment

Roller driver

PTU94002

Back tension cassette gauge

PUJ48076-2

Alignment tape

(SP, stairstep, NTSC)

MHP

A/C head positioning tool

PTU94010

Jig RCU

PTU94023B

Alignment tape

(EP, stairstep, NTSC)

MHP-L

Torque gauge

PUJ48075-2

Pole base assembly

(supply side)

Tension arm assembly

Fig. 2-1-3c

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

Guide pole guard

2-2

Pinch roller arm assembly

Press lever assembly

Fig. 2-1-3d

2.1.5 Maintenance and inspection

1. Location of major mechanical parts

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

UV catcher2 (supply and take-up side)

Stator assembly

Full erase head

T26

Pole base assembly

T25

(supply side)

Tension arm

T24

assembly

T23

Tension brake

T22

assembly

Adjust pin

T5 T7

Drum assembly

Head base

A/C head

Loading motor

Guide pole guard

Pinch roller arm

assembly

Lid guide

T10

Press lever

T11

assembly

Guide arm

T12

assembly

Reel disk

T13

(take-up side)

Sub brake assembly

T14

(take-up side)

Belt

B22

(loading motor)

B21

Control cam

B20

B19

Cassette gear

B18

Worm gear

Brake lever

Rec safety lever

Reel disk

T20

(supply side)

Main brake assembly (supply side)

Idler lever

T17T19T21

Idler arm assembly

T16T18

Pole base assembly (take-up side)

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

Capstan motor

Capstan brake assembly

B3 B5

Belt (capstan)

Loading arm gear (take-up side)

Loading arm gear (supply side)

Main brake assembly

T15

(take-up side)

Plate

(supply side)

Control

bracket1

Control plate

Tension arm

bearing

Link lever

B17

Rotary encoder guide

B16

Rotary encoder

B15

B14

Direct gear

B13

Change lever assembly

B12

B10

Clutch unit

Take-up head

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

Take-up lever

B11

2-3

Guide rail Roller cam assembly

L2L1

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

Opener guide

Door

opener

Drive gear

Cassette housing bracket

Limit gear

Loading motor

Worm gear

Belt (loading motor)

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

2. Cleaning

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

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

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

Note:

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

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

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

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

pletely dry before using the video tape.

3. Lubrication

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

Note:

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

4. Suggested servicing schedule for main components

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

System Parts Name

Upper drum assembly

A/C head

Lower drum assembly

Pinch roller arm assembly

Full erase head

Tension arm assembly

Tape transport

Capstan motor (Shaft)

Guide arm assembly

Capstan motor

Capstan brake assembly

Main brake assembly

Belt (Capstan)

Belt (Loading motor)

Loading motor

Clutch unit

Worm gear

Control plate

Brush

Tension brake assembly

Other Drive

Rotary encoder

: Cleaning

: Inspection or replacement if necessary

Operation Hours

~1000H ~2000H

¤R R ¤R ¤R

¤¤R ¤¤ ¤¤ ¤¤ ¤¤ ¤¤

R R R

R R R R R

¤R ¤R

Table 2-1-5a

5. Disassembling procedure table

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

2-4

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

Symbols and numbers

Removal parts

(Reference items) Replacement parts

Symbols and numbers

2.2.3 Guide rail T 1

2.2.3 Roller cam assembly T 1

2.2.3 Cassette housing bracket T 1

2.2.3 Opener guide T 2

2.2.3 Door opener T 3

2.2.3 Relay gear T 3

2.2.3 Limit gear T 3

2.2.3 Cassette holder assembly T 6

2.2.3 Drive gear T 4

2.2.3 Drive arm T 8

2.2.4 Pinch roller arm assembly T 1

T12

2.2.5 Guide arm assembly T 1

T11

2.2.5 Press lever assembly T 3

2.2.6 A/C head T 1

2.2.7 Loading motor T 1

2.2.8 Capstan motor T/B 1

2.2.9 UV catcher2 T 1

T17

Pole base assembly (take-up side)

2.2.9

T25

2.2.9

Pole base assembly (supply side)

B15

2.2.10 Rotary encoder B 1

B12

2.2.11 Clutch unit B 1

B14

2.2.12 Change lever assembly B 3

B13

2.2.12 Direct gear B 4

2.2.12 Coupling gear B 5

2.2.12 Clutch gear B 6

B17

2.2.13 Link lever B 1

2.2.14 Cassette gear B 2

B18

B20

2.2.14 Control cam B 2

B21

2.2.14 Worm gear B 1

T10

- Lid guide T/B 5

2.2.15 Control bracket1 B 1

2.2.15 Control plate B 6

2.2.16 Loading arm gear (supply side) B 7

Loading arm gear (take-up side)

2.2.16

2.2.16 Loading arm gear shaft B 9

2.2.17 Take-up lever T/B 7

B11

B10

2.2.17 Take-up head T/B 8

2.2.17 Control plate guide T/B 8

2.2.18 Capstan brake assembly T/B 7

T14

Sub brake assembly(take-up side)

2.2.19

T15

Main brake assembly(take-up side)

2.2.20

T19

2.2.20

Main brake assembly(supply side)

T13

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

T22

2.2.21 Tension brake assembly T/B 9

T20

2.2.21 Reel disk (supply side) T/B 10

T24

2.2.21 Tension arm assembly T/B 10

2.2.21 Tension arm bearing T/B 10

T18

2.2.22 Idler lever T/B 17

T16

2.2.22 Idler arm assembly T/B 18

B19

- Brake lever (

B16

- Rotary encoder guide T/B 19

) T/B 18

L1L1L2

Number of removal steps

Guide rail

Roller cam assembly

Cassette housing bracket

Opener guide

112 12

12 3

4 5

5 6

Relay gear

6 7

Front (T)/Back (B) of mechanism

1 2 3 4 5

T/B 2

T/B 15

1 2 3 4

T/B 16

1 2 3 4 5 6 7 8

T/B 9

1 2 3 4 5 6 7 8

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

1 2 3 4 5 6 7 8

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

1 2 3 4 5 6 7 8

Cassette holder assembly

Drive gear

Table 2-1-5b

Note:

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

1 : Uses the standard type mechanism only.

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

) have different types of mecha-

Drive arm

Pinch roller arm assembly

Guide arm assembly

Press lever assembly

UV catcher2

Rotary encoder

Clutch unit

Change lever assembly

Direct gear

Coupling gear

Link lever

Worm gear

Control bracket1

Control plate

Loading arm gear (supply side)

Loading arm gear (take-up side)

1 2 3 4 5

3 4

1 2 3 4

1 2 3 4 5

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

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

9 10 11 12 13 14

9 10 11 12 13 14 15

9 10 11 12 13 14 15 16

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

9 10 11 12 13 14 15 16 17 18

) 1

(

Take-up lever

Sub brake assembly (take-up side)

Main brake assembly (take-up side)

Reel disk (take-up side)

Tension brake assembly

Tension arm assembly

Idler lever

Brake lever

7 7

2-5

2.2 Replacement of major parts

2.2.1 Before starting disassembling (Phase matching between mechanical parts)

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

2.2.3 Cassette holder assembly

1. How to remove

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

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

Guide rail

Lugs

Roller cam assembly

Lug

Fig. 2-2-3a

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

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

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

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

2.2.2 How to set the “Mechanism assembling mode”

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

Worm gear

Chassis hole

Guide hole

Control cam

Limit gear

Spring(A)

Opener guide

Relay gear

Door opener

Cassette housing bracket

Slit washers

Fig. 2-2-3b

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

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

Lock lever (L)

Cassette holder assembly

Drive arm

(Upright)

2-6

Control plate

Fig. 2-2-2a

Mark E

Fig. 2-2-3c

Legs

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

Cassette holder assembly

Drive arm

Lock lever (R)

(A)

(C)

(B)

Cassette holder assembly

(5)

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

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

Cassette holder assembly

Fig. 2-2-3d

Cassette holder assembly

(A)

2. How to install (Phase matching)

(1) Insert the section (A) of the drive arm into the section (B)

of the main deck.

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

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

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

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

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

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

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

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

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

to bring it to the eject end position.

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

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

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

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

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

sette housing bracket and fasten the two slit washers.

Fig. 2-2-3e

Main deck right side

Drive arm

Hole

(C)

(B)

Drive arm

Fig. 2-2-3g

Hole

Drive gear

(1)

(2)

(A)

(B)

Fig. 2-2-3h

Fig. 2-2-3f

2-7

Relay gear

Guide holeNotches Notch

2.2.6 A/C head

1. How to remove

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

together with the head base.

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

screws (B) while controlling the compression spring.

Head base

Drive gear Limit gear

Fig. 2-2-3i

2.2.4 Pinch roller arm assembly

1. How to remove

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

sembly.

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

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

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

Slit washer

Pinch roller seat2

Spring

Pinch roller arm

Press lever assembly

Pinch roller arm assembly

assembly

Fig. 2-2-4a

2.2.5 Guide arm assembly and press lever assembly

1. How to remove

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

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

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

Fig.2-2-5a.)

Screws(A)

A/C head

Fig. 2-2-6a

Screws(B)

A/C head

Compression

A/C head board assembly

Head base

springs

Fig. 2-2-6b

2. How to install

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

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

A/C head

12.4 mm

Head base

Screw

2-8

Tension spring

LugLid guide

Fig. 2-2-5a

Press lever assembly

Guide arm assembly

Head base

A/C head

Fig. 2-2-6c

2.2.7 Loading motor

1. How to remove

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

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

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

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

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

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

Loading motor board assembly

Loading motor

Lugs

Motor guide

6.5 ± 0.2 mm

LABEL

Motor pulley

Worm gear

Belt

Fig. 2-2-7a

2.2.8 Capstan motor

1. How to remove

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

back side.

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

motor.

Screws(A)

Screw(A)

Capstan motor

Belt

Fig. 2-2-8a

Spacer

2. How to install (Centering the mounting position)

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

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

capstan motor.

(2) Install the mechanism assembly to which the capstan

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

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

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

Note:

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

2.2.9 Pole base assembly (supply or take-up side)

1. How to remove

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

ening the screw (A).

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

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

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

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

Note:

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

Fig. 2-2-8b

Connector for the capstan motor

Screw(A)

UV catcher2

Screw(A)

UV catcher2

Screw(B)

Fig. 2-2-9a

2-9

2.2.10 Rotary encoder

1. How to remove

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

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

Rotary encoder (Front side)

Screw(A)

Guide marks

2.2.12 Change lever assembly, direct gear, clutch gear and coupling gear

1. How to remove

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

arrow-indicated direction and remove the change lever assembly.

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

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

Rotary encoder (Back side)

Positioning pin of the rotary encoder

Fig. 2-2-10a

Mark E

Shaft of the rotary encoder guide

Control plate

Fig. 2-2-10b

2. How to install (Phase matching)

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

ment with the mark

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

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

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

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

2.2.11 Clutch unit

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

the clutch unit.

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

Change lever assembly

Spring(B)

Lugs

Note:

• The parts with marked ( speed FF/REW type). 1 : Uses the standard type mechanism only.

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

Slit washer

Washer (*1)

Spacer

Direct gear

Spring(A) Position the projecting side down.

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

Coupling gear

Spring (C)

Clutch gear

Spacer

Fig. 2-2-12a

2. How to install

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

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

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

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

Rotary encoder guide

Spring(B)

Change lever assembly

Coupling gear

2-10

Belt

Clutch unit

Fig. 2-2-11a

Slit washer

Main deck Main deck

Fig. 2-2-12b

2.2.13 Link lever

1. How to remove

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

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

Slit washers

2.2.14 Cassette gear, control cam and worm gear

1. How to remove

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

the latter off.

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

loading motor.

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

worm gear.

Link lever

Locking section of the control plate

Fig. 2-2-13a

2. How to install (Phase matching)

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

the mark

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

13b.)

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

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

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

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

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

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

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

Loading motor

Belt

Lug

Worm gear

Lugs

Cassette gear

Lid guide

Control cam

Fig. 2-2-14a

2.2.15 Control plate

1. How to remove

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

remove the latter.

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

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

Shaft of the rotary encoder guide

Fig. 2-2-13b

Worm gear

Main deck guide hole

Control cam guide hole

Cassette gear

Fig. 2-2-13c

Control plate

Control cam

Mark E

Screw(A)

Control bracket1

Control plate

Fig. 2-2-15a

2. How to install (Phase matching)

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

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

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

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

2-11

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

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

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

ment with the mark

of the loading arm gear shaft. (See

Fig.2-2-15c.)

(5) Pull off the hexagonal wrench for positioning.

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

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

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

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

Idler arm assembly pin

R section

Guide hole of the control plate guide

Section D

1.5mm hexagonal wrench

Fig. 2-2-15b

Section A

Section D

Hole A

Pressfit

Take-up lever

Insert

Pole base assembly (supply side)

Section A

Hole A

Pole base assembly (take-up side)

Screw(B)

Torsion arm

Loading arm gear (take-up side)

Projection B

Guide marks

Projection A

Pole base assembly (supply side)

Screw(A)

Loading arm gear (supply side)

Fig. 2-2-16a

Loading arm gear shaft

Loading arm gear (take-up side)

Notch

Screw(C)

Loading arm gear shaft

Section C

Section B

Hole B

Section B

Control plate

Tension arm assembly shaft

Fig. 2-2-15c

2.2.16 Loading arm gear (supply or take-up side) and loading arm gear shaft

1. How to remove

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

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

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

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

2-12

Fig. 2-2-16b

2. How to install

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

the projection B of the loading arm gear shaft and slip it over. Then rotate it clockwise for alignment with the projection A and slip it down to the bottom. (See Fig.2-216b.)

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

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

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

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

2.2.17 Take-up lever, take-up head and control plate

Lug(D)

Lug(C)

SpringLug(E)

Lug(A)

Lug(B)

Main brake assembly (take-up side)

Reel disk (take-up side)

Main brake assembly (supply side)

Notch

guide

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

deck.

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

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

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

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

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

remove the control plate guide.

Idler arm assembly pin

Lug(C)

Screw(A)

Take-up lever

Take-up head

Lug(A)

Lug(B)

Control plate guide

Fig. 2-2-17a

2.2.18 Capstan brake assembly

1. How to remove

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

arrow-indicated direction so that it comes into alignment

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

the main deck and remove the capstan brake assembly.

Spring

Sub brake

Lug(A)

Lug(B)

assembly (take-up side)

Lug(C)

Fig. 2-2-19a

2.2.20 Main brake assembly (take-up side), reel disk (take-up side) and main brake assembly (supply side)

1. How to remove

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

row-indicated direction and remove the reel disk (takeup side). Remove the spring attached to the main brake assembly.

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

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

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

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

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

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

Lug(B)

Lug(A)

Capstan brake assembly

Fig. 2-2-18a

2.2.19 Sub brake assembly (take-up side)

1. How to remove

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

brake assembly (take-up side).

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

into alignment with the notch of the main deck.

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

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

Fig. 2-2-20a

(

Brake lever

Note:

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

Rotary encoder guide

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

Fig. 2-2-20b

2-13

2.2.21 Tension brake assembly, reel disk (supply side)

(

)

and tension arm assembly

1. How to remove

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

from the main deck and pull them off.

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

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

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

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

Lug of the tension arm bearing

Tension arm assembly

Reel disk (supply side)

2.2.23 Stator assembly

(1) Remove the flat cable. (2) Remove the two screws (A), (B) and remove the lug wire. (3) Remove the stator assembly by lifting in the arrow-indi-

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

Notes:

• Be careful not to lose the brush and spring.

• There are some models that do not use the lug wire.

Refer to the parts list for these models.

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

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

Tension brake assembly

Lugs

Tension spring Main brake assembly

supply side

Fig. 2-2-21a

2.2.22 Idler lever, idler arm assembly

1. How to remove

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

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

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

bly.

Lug Idler lever

Hook

Idler arm assembly

Slit washer

Screw (A)

Stator assembly

Screw (B)

Lug wire (Note)

Drum shaft

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

Lug wire

Screw (A)

Fig. 2-2-23a

2.2.24 Rotor assembly

1. How to remove

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

bly.

2. How to install

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

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

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

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

Screws (B)

Hole(a)

2-14

Fig. 2-2-22a

Screw holes

Upper drum assembly

Rotor assembly

Fig. 2-2-24a

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

Hole(b)

2.2.25 Upper drum assembly

Notes:

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

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

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

1. How to remove

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

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

(3) Remove the upper drum assembly and remove the

washer using tweezers.

Lower drum assembly

Coil parts

Upper drum assembly

Fig. 2-2-25b

Spring

Brush

Upper drum assembly

Washer

Collar assembly

Loosen

Cap

Shaft

1.5 mm hexagonal wrench

Lower drum assembly

Fig. 2-2-25a

2. How to install

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

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

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

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

while controlling its up- down movement. (5) Secure the collar assembly in position with a hexagonal

wrench while pressing its top with the fingers. (6) After installation, gently turn the upper drum assembly

with your hand to make sure that it turns normally. Then

install the brush and the spring. (7) Install the rotor assembly and stator assembly according

to Fig 2-2-23a and 2-2-24a. (8) When installation is complete, clean the upper drum as-

sembly and lower drum assembly and carry out the fol-

lowing adjustments.

• PB switching point adjustment

• Slow tracking adjustment

• Compatibility adjustment (Be sure to check for compat-

ibility for the EP (or LP) mode.)

Upper drum assembly

Collar assembly

Fig. 2-2-25c

Press

Fig. 2-2-25d

Collar assembly

Tighten

2-15

2.3 Compatibility adjustment

Notes:

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

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

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

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

Jig RCU

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

pole base assembly (supply or take-up side).

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

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

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

occur at the roller upper or lower limits. (See Fig. 2-31d.)

[Perform adjustment step (9) only for the models

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

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

CUSTOM CODE 43: A CODE 53: B CODE

DATA CODE

INITIAL MODE

Fig. 2-3a Jig RCU [PTU94023B]

2.3.1 FM waveform linearity

Signal (A1) •

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

Alignment tape(SP, stairstep, NTSC) [MHP] 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. Per-

form the following adjustments when required. (See Fig.

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

tion. If a drop in level is found on the left side, turn the

guide roller of the pole base assembly (supply side) with

the roller driver to make the V.PB FM waveform linear.

If a drop in level is on the right side, likewise turn the guide

roller of the pole base assembly (take-up side) with the

roller driver to make it linear. (See Fig. 2-3-1c.) (6) Make sure that the V.PB FM waveform varies in parallel

and linearly with the tracking operation again. When re-

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

Max level

Proper waveform variation

Improper waveform variation

Fig. 2-3-1a

Roller driver

Fig. 2-3-1b

Min level

Guide roller (supply side)

2-16

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