JVC HR-J785EK, HR-J780EU, HR-J680EU, HR-J680EK Service Manual

SERVICE MANUAL

VIDEO CASSETTE RECORDER

– –:– –

TV/VCR

AUDIO

DAILY/QTDN.

VPS/PDC

WEEKLY/HEBDO

AUX

0000

STOP

START

DATE

FIN

DEBUT

EXPRESS

30 SEC

PROG

–

SAT

VCR SAT

REVIEW

24H EXPRESS

PUSH / TURN

PAL

SPECIFICATIONS

(The specifications shown pertain specifically to the model HR-J785EK)

g e n e r a l

Power requirement : AC 220 V – 240 V

, 50 Hz/60 Hz

Power consumption : on : 16 W, off : 4.0 W Operating Temperature : 5°C to 40°C Storage Temperature : –20°C to 60°C Operating position : Horizontal only Dimensions (WxHxD) : 400 mm x 94 mm x 278 mm Weight : 3.4 kg Format : VHS PAL standard Maximum recording time

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

v i d e o / a u d i o

Signal system : PAL-type colour signal and CCIR monochrome signal,

625 lines/50 fields Recording system : DA4 (Double Azimuth) helical scan system Signal-to-noise ratio : 45 dB Horizontal resolution : 250 lines Frequency range : 70 Hz to 10,000 Hz (Normal audio)

20 Hz to 20,000 Hz (Hi-Fi audio) Input/Output :

21-pin SCART connectors (IN/OUT x 1, IN/DECODER x 1)

RCA connectors (AUDIO OUT x 1)

This service manual is printed on 100% recycled paper.

t u n e r

TV channel storage capacity

t i m e r

: 99 positions (+AUX position) Tuning system : Frequency synthesized tuner Channel coverage : VHF 44.5 MHz – 143 MHz/

143 MHz – 470 MHz/

UHF 470 MHz – 862 MHz Aerial output : UHF channels 22 – 69 (Adjustable) Memory backup time : Approx. 10 min.

a c c e s s o r i e s

Provided accessories : RF cable, Satellite Controller,

Infrared remote control unit,

‘AA’ battery x 2

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

No. 82847

January 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 .................................................................... 1-4

1.4.1 How to set the “Service position”..................................... 1-4

1.5 Mechanism service mode..................................................... 1-4

1.5.1 How to set the “Mechanism service mode” ..................... 1-4

1.6 Jig RCU mode ....................................................................... 1-4

1.6.1 Setting the Jig RCU mode............................................... 1-4

1.6.2 Setting the User RCU mode ............................................ 1-4

1.7 Emergency display function ................................................. 1-5

1.7.1 Displaying the EMG information...................................... 1-5

1.7.2 Clearing the EMG history ................................................ 1-5

1.7.3 EMG content description ................................................. 1-6

1.7.4 EMG detail information <1>............................................. 1-7

1.7.5 EMG detail information <2>............................................. 1-8

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 .............................................................. 2-10

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

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

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

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

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

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

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

2.2.20

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

2-13

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

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

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

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

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

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

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

2.3.1 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

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

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

3.2.2 Slow tracking preset ........................................................ 3-2

3.3 Video circuit.......................................................................... 3-2

3.3.1 Auto picture initial setting ................................................ 3-2

3.4 Syscon circuit [HR-J680EU/J780EU] ................................... 3-2

3.4.1 Timer clock ...................................................................... 3-2

4. CHARTS AND DIAGRAMS

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

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

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

4.2 MAIN(VIDEO/AUDIO) SCHEMATIC DIAGRAM ................... 4-5

4.3 MAIN(ON SCREEN) SCHEMATIC DIAGRAM ..................... 4-7

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

4.5 MAIN(SW.REG) SCHEMATIC DIAGRAM ...........................4-11

4.6 MAIN(TUNER) SCHEMATIC DIAGRAM ............................ 4-13

4.7 MAIN(FRONT) AND ADV.JOG SCHEMATIC DIAGRAMS. 4-15

4.8 MAIN(TERMINAL), SAT CTL AND R.PAUSE SCHEMATIC

DIAGRAMS ........................................................................ 4-17

4.9 REMOTE CONTROLLER SCHEMATIC DIAGRAM ........... 4-19

4.10 MAIN, SAT CTL AND R.PAUSE CIRCUIT BOARDS ....... 4-21

4.11 FDP GRID ASSIGNMENT AND ANODE CONNECTION 4-23

4.12 WAVEFORMS.................................................................. 4-24

4.13 VOLTAGE CHARTS......................................................... 4-25

4.14 CPU PIN FUNCTION....................................................... 4-26

4.15 SYSTEM CONTROL BLOCK DIAGRAM......................... 4-27

4.16 VIDEO BLOCK DIAGRAM............................................... 4-29

4.17 AUDIO BLOCK DIAGRAM .............................................. 4-31

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

MAIN BOARD ASSEMBLY <03>............................................... 5-6

A/C HEAD BOARD ASSEMBLY <12>..................................... 5-13

ADV.JOG BOARD ASSEMBLY(HR-J780EU/J785EK) <38>... 5-13

LOADING MOTOR BOARD ASSEMBLY <55> ....................... 5-13

R.PAUSE BOARD ASSEMBLY(HR-J780EU)<91> ................. 5-13

SAT_CTL BOARD ASSEMBLY <92> ...................................... 5-13

The following table lists the differing points between Models ( HR-J680EK, HR-J680EU, HR-J780EU and HR-J785EK) in this series.

HR-J680EK HR-J680EU HR-J780EU HR-J785EK

JOG/SHUTTLE NOT USED NOT USED USED USED VIDEO SYSTEM PAL PAL/MESECAM(MANUAL) PAL/MESECAM(MANUAL) PAL BROADCASTING STANDARD I B/G,D/K B/G,D/K I STEREO DECODER NICAM NICAM/A2 NICAM/A2 NICAM RF OUT SYSTEM [INITIAL] I G,K G,K I VCR PLUS+ VIDEOPLUS+ DELUXE SHOWVIEW DELUXE SHOWVIEW DELUXE VIDEOPLUS+ DELUXE LANGUAGE [INITIAL] (ON SCREEN DISPLAY) AUDIO DUBBING/OPERATION NOT USED NOT USED USED/BUTTON NOT USED FRONT VIDEO/AUDIO IN NOT USED NOT USED USED NOT USED WINDOW COLOR SMOKE LIGHT GRAY SMOKE LIGHT GRAY BLUE SMOKE LIGHT GRAY REMOTE PAUSE NOT USED NOT USED USED NOT USED CABLE MOUSE PROVIDED OPTION OPTION PROVIDED

ENG 13LANG.[ENG] 13LANG.[ENG] ENG

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 critical for safety. Replace only with specified part numbers.

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

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

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

4. Use specified internal wiring. Note especially:

1) Wires covered with PVC tubing

2) Double insulated wires

3) High voltage leads

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

1) Insulation Tape 3) Spacers 5) Barrier

2) PVC tubing 4) Insulation sheets for transistors

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

! symbol and shaded ( ) parts are

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

1) Connector part number : E03830-001

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

will not damage insulated parts.

3) Replacement procedure

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

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

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.

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

Not easily pulled free

Wire insulation recessed

more than 4 mm

Crimping tool

Fig.6

Crimped at approx. center

Fig.7

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.

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.

Externally exposed accessible part

Z V

Fig. 9

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]

1.2

How to read the disassembly and assembly

Top cover, Bracket

Front panel assembly

Drum assembly

Mechanism 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) 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

1.3 Disassembly/assembly method

Step/

Loc No.

[1] Top cover, D1 4(S1a), (S1b)

[2] Front panel assembly D2 CN7001(WR2a) <Note 2a>

[3] Drum assembly D3 CON1(WR3a),

[4] Mechanism assembly D4 CN2001(WR4a), <Note 2c>

[5] Main board assembly D5 6(L5a), <Note 2c>

[6] Bottom cover D6 2(L6a), 9(L6b) <Note 6a>

Part Name

Bracket 2(S1c)

ADV. Jog board assembly

(Drum shield) 2(S3d)

Fig.

No.

Point Note

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

[HR-J780EU/J785EK], 4(L2a), 3(L2b) <Note 2c>

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

2(S2a)

CN1(WR3b), (S3a), (S3b), (S3c)

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

(S4a),(S4b), <Note 4a> (S4c), (S4d)

(S5a), 3(S5b), (S5c)

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

• Be careful not to damage the connector and wire etc. during connection and disconnection. When connecting the wire to the connector, be careful with the wire direction.

• When it is required to remove the screws (S4a to S4b) 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 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.

• The wire (WR4a) has excess length that may be loose, as it is quite long. After inserting the wire and connectors, the loose portion of the wire should be taken up and accommodated between the A/C head base and the main deck.

When removing the bottom cover, push down the two tabs (L6a) to slide the bottom cover.

1-1

Procedures for Lowering the Cassette holder assembly

As the mechanism of this unit is integrated with the Housing assembly, the holder must be lowered and the two screws unscrewed when removing the Mechanism assembly.

[2] Front panel assembly

(L2a)

(A)

(B)

Fig. 2

Fig. 1

Fig. 3

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

Procedures for Lowering the Cassette holder assembly

(S1a)

(S1b)

CN7001

(L2b)

b <Note 2b>

a <Note 2a>

(L2a)

WR2a <Note 2c>

CN7004

(S2a)

ADV. Jog board assembly [HR-J780EU/J785EK]

WR2a <Note 2c>

Fig. D2

Note: When installing the Drum assembly, secure the screws (S3a to S3c) in the order of a, b, c.

Drum shield

(S3d)

1-2

(S1c)

[1]

Top cover

Inertia plate

(S3c)

(S3a)

(L3a)

(P3)

(S1a)

(L3b)

[3] Drum asembly

CN1

(S1c)

[1]

Bracket

(S1a)

Roller arm assy

Not used

Fig. D1 Fig. D3

CON1

WR3a <Note 2c>

(S3b)

WR3b <Note 2c>

Cleaner assy

(L3c)

Not used

WR4a

(S4b)

A/C head base

(S4c)

Note: When installing the Mechanism assembly, secure the screws (S4a to S4b) in the order of a, b.

WR4a <Note 2c>

(S4a)

(S4d)

Q3002

End sensor

(L4)

Spacer

(S5a)

D3001 LED <Note 4a>

Fig. D4

CN2001

[4] Mechanism assembly

(L4) Spacer <Note 4a>

(S5b)

(S5c)

(L6b)

Fig. D6

(L6b)

(L6a)

(L6b)

[6] Bottom cover

Fig. D5

(L5a)

[5] Main board assembly

1-3

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.

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 Drum assembly.

(2) Lower the cassette holder to prepare for the removal of

the Mechanism assembly screws. (Refer to the “Procedures for lowering the Cassette holder assembly” of 1.3 Disassembly/assembly method.)

(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.

• 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.

TP4001

TP106

CTL. P

PB. FM

TP2253 A.PB.FM

TP111 D.FF

CP4001

CP5302

Main board assembly

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) Connect TPGND and TP7001(TEST) on the Main board

assembly with a jump wire. (3) Insert the power cord plug into the power outlet. (4) 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.) (5) 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.

1.6.1 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.

1-4

C3025 Timer Clock [HR-J680EU/J780EU]

Fig. 1-4-1a

TPGND

TP7001 TEST

1.7 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. 1-7a Jig RCU [PTU94023B]

1.7.1 Displaying the EMG information

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

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

<Example 1> E : 01 : 03

Previous EMG

Latest EMG

<Example 2> E : –– : ––

No EMG record

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

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

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

EMG

–4 : Mechanism mode position at the moment of EMG

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

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

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

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

set the display.

Notes:

•

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

•

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

•

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

•

For the EMG detail information <2> , see “1.7.5 EMG detail information <2>”.

1.7.2 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)

1-5

1.7.3 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/

1. FWD SEARCH/FF, etc.) because;

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

sette is cut in the middle;

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

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

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

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

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

has been cut in the middle;

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

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

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

The power to a reel sensor is not supplied.

Table 1-7-3a

1-6

1.7.4 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 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

- 0A Mode transition to STOP with cassette ejection end

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

1-7

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.

1.7.5 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.

1-8

SECTION 2

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

(C)

(A)

(B)

Press

Fig. 2-1-3b

2-1

2. In case of mechanical failure

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

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

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

MHPE

A/C head positioning tool

PTU94010

Jig RCU

PTU94023B

Alignment tape

(LP, stairstep, PAL)

MHPE-L

Torque gauge

PUJ48075-2

Pole base assembly

(supply side)

Tension arm assembly

Fig. 2-1-3c

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

2-2

Guide pole guard

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

Drum assembly

T5 T7

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

Link lever

B17

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

Belt (capstan)

Capstan brake assembly

B3 B5

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

Rotary encoder guide

B16

Rotary encoder

B15

B14

Direct gear

B13

Change lever assembly

B12

B10

Clutch unit

Take-up head

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

B11

Take-up lever

2-3

Guide rail Roller cam assembly

L2L1

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

Opener guide

Door

opener

Drive gear

Cassette housing bracket

Limit gear

Loading motor

Worm gear

Belt (loading motor)

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

2. Cleaning

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

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

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

Note:

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

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

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

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

pletely dry before using the video tape.

3. Lubrication

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

Note:

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

4. Suggested servicing schedule for main components

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

System Parts Name

Upper drum assembly A/C head Lower drum assembly Pinch roller arm assembly Full erase head Tension arm assembly

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 B1 9

Symbols and numbers

Removal parts

(Reference items) Replacement parts

Symbols and numbers

2.2.3 Guide rail T 1

2.2.3 Roller cam assembly T 1

2.2.3 Cassette housing bracket T 1

2.2.3 Opener guide T 2

2.2.3 Door opener T 3

2.2.3 Relay gear T 3

2.2.3 Limit gear T 3

2.2.3 Cassette holder assembly T 6

2.2.3 Drive gear T 4

2.2.3 Drive arm T 8

2.2.4 Pinch roller arm assembly T 1

T12

2.2.5 Guide arm assembly T 1

T11

2.2.5 Press lever assembly T 3

2.2.6 A/C head T 1

2.2.7 Loading motor T 1

2.2.8 Capstan motor T/B 1

2.2.9 UV catcher2 T 1

T17

Pole base assembly (take-up side)

2.2.9

T25

Pole base assembly (supply side)

2.2.9

B15

2.2.10 Rotary encoder B 1

B12

2.2.11 Clutch unit B 1

B14

2.2.12 Change lever assembly B 3

B13

2.2.12 Direct gear B 4

2.2.12 Coupling gear B 5

2.2.12 Clutch gear B 6

B17

2.2.13 Link lever B 1

2.2.14 Cassette gear B 2

B18 B20

2.2.14 Control cam B 2

B21

2.2.14 Worm gear B 1

T10

- Lid guide T/B 5

2.2.15Control bracket1 B 1

2.2.15Control plate B 6

2.2.16Loading arm gear (supply side) B 7

Loading arm gear (take-up side)

2.2.16

2.2.16Loading arm gear shaft B 9

2.2.17Take-up lever T/B 7

B11 B10

2.2.17Take-up head T/B 8

2.2.17Control plate guide T/B 8

2.2.18Capstan brake assembly T/B 7

T14

2.2.19

Sub brake assembly(take-up side)

T15

Main brake assembly(take-up side)

2.2.20

T19

Main brake assembly(supply side)

2.2.20

T13

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

T22

2.2.21Tension brake assembly T/B 9

T20

2.2.21Reel disk (supply side) T/B 10

T24

2.2.21Tension arm assembly T/B 10

2.2.21Tension arm bearing T/B 10

T18

2.2.22Idler lever T/B 17

T16

2.2.22Idler arm assembly T/B 18

B19

- Brake lever (

B16

- Rotary encoder guide T/B 19

) T/B 18

L1L1L2

Number of removal steps

Guide rail

Roller cam assembly

Cassette housing bracket

Opener guide

112 12 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 2

T/B 15

1 2 3 4

T/B 16

1 2 3 4 5 6 7 8

T/B 9

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

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 1

1 2 3 4 5

3 4

1 2 3 4 1 2 3 4 5 1 2 3 4 5 6 1 2 3 4 5 6 7 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 9 10 11 12 13 14 9 10 11 12 13 14 15

9 10 11 12 13 14 15

9 10 11 12 13 14 15 16 9 10 11 12 13 14 15 16 17 9 10 11 12 13 14 15 16 17 9 10 11 12 13 14 15 16 17 18

1 1

Take-up lever

Sub brake assembly (take-up side)

Main brake assembly (take-up side)

Reel disk (take-up side)

Tension brake assembly

Tension arm assembly

Idler lever

7 7

9 9 9

)

(

Brake lever

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.

2.2.2 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

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.)

Limit gear

Spring(A)

Opener guide

Relay gear

2-6

Control plate

Fig. 2-2-2a

Guide hole

Control cam

Mark E

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

Leg Legs

Drive arm

(Upright)

Fig. 2-2-3c

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

(5)

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

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

Cassette holder assembly

Fig. 2-2-3d

Cassette holder assembly

(A)

2. How to install (Phase matching)

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

of the main deck.

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

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

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

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

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

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

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

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

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

to bring it to the eject end position.

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

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

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

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

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

sette housing bracket and fasten the two slit washers.

Cassette holder assembly

Fig. 2-2-3e

Main deck right side

Drive arm

Hole

Lock lever (R)

(A)

(B)

(C)

(B)

Drive arm

(C)

Fig. 2-2-3g

Cassette holder assembly

Hole

Drive gear

(1)

(2)

(A)

(B)

Fig. 2-2-3h

Fig. 2-2-3f

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