JVC HM-HDS4EK, HM-HDS4EX Service Manual

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SERVICE MANUAL

HDD & S-VHS VIDEO RECORDER

HM-HDS4EK, HM-HDS4E

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

SPECIFICATIONS

GENERAL

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

Power on : 42 W Power off : 12 W

Temperature

Operating : 5°C to 40°C Storage : –20°C to 60°C

Operating position : Horizontal only Dimensions (WxHxD)

Weight : 5.3 kg Input/Output : 21-pin SCART connectors:

HDD DECK VIDEO/AUDIO

Video format : MPEG2 (VBR) Audio format : MPEG1 Layer2 Maximum recording time (approx.)

(DV) : 6 hours (SP) : 20 hours (LP) : 28 hours (EP) : 56 hours (SEP) : 80 hours

: 435 mm x 98 mm x 357 mm

IN/OUT x 1, IN/DECODER x 1 RCA connectors: VIDEO IN x 1, AUDIO IN x 1, AUDIO OUT x 1 S-Video connectors: IN x 1, OUT x 1 DV connector: IN/OUT x 1 (4-pin.IEEE1394 conformity, digital input/output)

(The specifications shown pertain specifically to the model HM-HDS4EX.)

VHS DECK VIDEO/AUDIO

Signal system : PAL-type colour signal and CCIR

Recording system : DA4 (Double Azimuth) head helical

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

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

Maximum recording time

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

TUNER/TIMER

TV channel storage capacity

Tuning system : Frequency synthesized tuner Channel coverage : VHF 47 MHz – 89 MHz/

Memory backup time

monochrome signal, 625 lines 50 fields

scan system

: 250 lines (VHS)

400 lines (S-VHS)

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

: 99 positions (+AUX position)

104 MHz – 300 MHz/ 302 MHz – 470 MHz UHF 470 MHz – 862 MHz

: Approx. 10 min.

ACCESSORIES

Provided accessories

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

: RF cable,

21-pin SCART cable, Satellite Controller, Infrared remote control unit, “R6” battery x 2

ATTENTION

This recorder contains microcomputers. External electronic noise or interference could cause malfunctioning. In such cases, switch the recorder off and unplug the mains power cord. Then plug it in again and turn the recorder on. Take out the cassette. After checking the cassette, operate the unit as usual.

HM-HDS4EK,HM-HDS4EX D2HS1

No.82966

2003/06

Section Title Page Section Title Page

Important Safety Precautions INSTRUCTIONS

1. DISASSEMBLY

1.1 Before disassembling................................................... 1-1

1.1.1 SYSTEM INFORMATION display .......................... 1-1

1.1.2 STANDALONE mode .............................................1-1

1.1.3 Jig RCU mode........................................................ 1-1

1.1.3.1 Setting the Jig RCU mode ................................1-1

1.1.3.2 Setting the user RCU mode ..............................1-1

1.1.3.3 Table of Jig RCU cord .......................................1-1

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

1.2 Removing the major parts ........................................... 1-3

1.2.1 How to read the procedure table........................... 1-3

1.2.2 Disassembly procedure ........................................ 1-3

1.3 Emergency display function ........................................ 1-6

1.3.1 Displaying the EMG information ........................... 1-6

1.3.2 Clearing the EMG history ...................................... 1-6

1.3.3

Details of the OSD display in the EMG display mode

1.3.4 EMG content description....................................... 1-8

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

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

1.3.7 EMG detail information<3> ................................. 1-10

1.4 Service position......................................................... 1-11

1.4.1 How to set the "Service position" ........................ 1-11

1.5 Mechanism service mode ......................................... 1-11

1.5.1 How to set the "Mechanism service mode"......... 1-11

1.5.2 How to exit from the "Mechanism service mode" 1-11

1.6 Maintenance and inspection ..................................... 1-12

1.6.1 Cleaning .............................................................. 1-12

1.6.2 Lubrication .......................................................... 1-12

1.6.3

Suggested servicing schedule for main components

2. MECHANISM

Refet to the SERVICE MANUAL No.86700 (MECHANISM ASSEMBLY)

3. ADJUSTMENT

3.1 Before adjustment....................................................... 3-1

3.1.1 Precaution ..............................................................3-1

3.1.2 Required test equipments ..................................... 3-1

3.1.3 Required adjustment tools .................................... 3-1

3.1.4 Color(colour) bar signal, color(colour) bar pattern 3-1

3.1.5 Switch settings ...................................................... 3-1

3.1.6

Manual tracking mode (Auto tracking ON/OFF) setting

3.1.7

EVR sdjustment ............................................................

3.2 Mechanism compatibility adjustment .......................... 3-2

3.2.1 Tension pole position............................................. 3-2

3.2.2 FM waveform linearity ........................................... 3-3

3.2.3 Height and tilt of the A/C head .............................. 3-3

3.2.4 A/C head phase(X-value)...................................... 3-4

3.3 Electrical Adjustment................................................... 3-4

3.3.1 Servo circuit .......................................................... 3-4

3.3.1.1 Switching point................................................. 3-4

3.3.1.2 Slow tracking preset......................................... 3-5

3.3.2 Video circuit........................................................... 3-5

3.3.2.1 EE Y/PB Y(S-VHS/VHS)level........................... 3-5

3.3.3 Audio circuit........................................................... 3-5

3.3.3.1 Audio REC FM ................................................. 3-5

3.3.4 Digital circuit........................................................... 3-6

3.3.4.1 HDD Y level.......................................................3-6

3.3.4.2 HDD C level ......................................................3-6

3.3.5 Syscon circuit ........................................................ 3-6

3.3.5.1 Timer clock....................................................... 3-6

... 1-7

.. 1-12

3-2 3-2

4. CHARTS AND DIAGRAMS

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

4.2 SW REG SCHEMATIC DIAGRAM...............................4-5

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

4.4 MAIN(S-SUB) SCHEMATIC DIAGRAM.......................4-9

4.5 MAIN(FMA) SCHEMATIC DAIGRAM ........................ 4-11

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

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

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

4.9 MAIN(FRONT), S-JACK, ADV.JOG AND LED/SW

SCHEMATIC DIAGRAMS........................................ 4-19

4.10 MAIN(CONNECTION) SCHEMATIC DIAGRAM......4-21

4.11 2D DIGITAL SCHEMATIC DIAGRAM ...................... 4-23

4.12 TERMINAL(V_IO) SCHEMATIC DIAGRAM............. 4-25

4.13 TERMINAL(I/O) SCHEMATIC DIAGRAM ................4-27

4.14 DEMODULATOR SCHEMATIC DAIGRAM..............4-29

4.15 DIGITAL(ASIC IF) SCHEMATIC DIAGRAM.............4-31

4.16 DIGITAL(MPEG DEC) SCHEMATIC DIAGRAM ...... 4-33

4.17 DIGITAL(MPEG ENC) SCHEMATIC DIAGRAM ...... 4-35

4.18 DIGITAL(CONNECTION) SCHEMATIC DIAGRAM . 4-37

4.19 DIGITAL(AUDIO AD/DA) SCHEMATIC DIAGRAM ..4-39

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

4.21 MAIN(ON SCREEN) SCHEMATIC DIAGRAM......... 4-43

4.22 MAIN CIRUCIT BOARD...........................................4-45

4.23 SW REG & 2D DIGITAL CIRCUIT BOARDS ...........4-47

4.24

TERMINAL & DEMODULATOR CIRCUIT BOARDS .

4.25 DIGITAL CIRCUIT BOARD ......................................4-49

4.26 S-JACK, ADV.JOG & LED/SW CIRCUIT BOARDS . 4-51

4.27

FDP GRID ASSIGNMENT AND ANODE CONNECTION .

4.28 VOLTAGE CHARTS .................................................4-53

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

4.30 CPU PIN FUNCTION ...............................................4-56

4.31 SYSTEM CONTROL BLCOK DIAGRAM.................4-57

4.32 HDD BLOCK DIAGRAM ..........................................4-58

4.33 VIDEO BLOCK DIAGRAM .......................................4-59

4.34 AUDIO BLOCK DIAGRAM.......................................4-63

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 ASSSEMLY<01>.................................5-6

MAIN BOARD ASSEMBLY<03> (incl. 2D D,DEMOD) .... 5-7

2D DIGITAL BOARD ASSEMBLY<05>......................... 5-14

TERMINAL BOARD ASSEMBLY<06> .......................... 5-15

A/C HEAD BOARD ASSEMBLY<12> ........................... 5-17

DEMOD BOARD ASSEMBLY<14> ............................... 5-17

S.JACK BOARD ASSEMBLY<29>................................ 5-18

ADV.JOG BOARD ASSEMBLY<38>............................. 5-18

LED/SW BOARD ASSEMBLY<47> ...............................5-18

DIGITAL BOARD ASSEMBLY<50>................................ 5-18

LOADING MOTOR BOARD ASSEMBLY<55>.............. 5-23

4-48

4-52

Important Safety Precautions

Connector

Metal sleeve

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.

Fig.5

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

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

1.25

2.0

5.5

Fig.6

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

Not easily pulled free

Wire insulation recessed

more than 4 mm

Fig.7

Crimping tool

Crimped at approx. center

of metal sleeve

Conductors extended

S40888-01

Chassis

Power cord, primary wire

Safety Check after Servicing

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

1. Insulation resistance test

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

2. Dielectric strength test

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

3. Clearance distance

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

Fig. 8

4. Leakage current test

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

Externally exposed accessible part

Z V

Fig. 9

5. Grounding (Class 1 model only)

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

Measuring Method:

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

AC inlet

Earth pin

AC Line Voltage

100 V 100 to 240 V 110 to 130 V

110 to 130 V 200 to 240 V

Exposed accessible part

Milli ohm meter

Fig. 10

Region

Japan

USA & Canada

Europe & Australia R 10 MΩ/500 V DC

Region Load Z

Insulation Resistance (R)

≤

R 1 MΩ/500 V DC

≥≥

1 MΩ R 12 MΩ/500 V DC

≤

Table 1 Specifications for each region

Grounding Specifications

Region USA & Canada Europe & Australia

Dielectric Strength

AC 1 kV 1 minute AC 1.5 kV 1 miute AC 1 kV 1 minute

AC 3 kV 1 minute AC 1.5 kV 1 minute

(Class 2) (Class 1)

Grounding Impedance (Z)

≤

Z 0.1 ohm

≤

Z 0.5 ohm

Clearance Distance (d), (d')

≤

d, d' 3 mm

≤

d, d' 4 mm

≤

d, d' 3.2 mm

≤

d 4 mm

≤

d' 8 mm (Power cord)

≤

d' 6 mm (Primary wire)

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

100 V

110 to 130 V

110 to 130 V 220 to 240 V

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

Japan

USA & Canada

Europe & Australia

Table 2 Leakage current specifications for each region

1 kΩ

0.15 µF

1.5 kΩ

2 kΩ

50 kΩ

≤

i 1 mA rms Exposed accessible parts

≤

i 0.5 mA rms

≤

i 0.7 mA peak

≤

i 2 mA dc

≤

i 0.7 mA peak

≤

i 2 mA dc

Exposed accessible parts

Antenna earth terminals

Other terminals

S40888-01

Hard Disk Drive (HDD)

1. Hard Disk Drive (HDD) Handling Precautions

The HDD is a precision device f or use in reading and writing a large amount of data on or from a disk rotating at a high speed. If it is not handled carefully, either abnormal operation may result or it may not be possib le to read data. The HDD is sensitiv e to the following items and special care is required in saf eguarding against them when handling an HDD. Also take care in handling a set incorporating an HDD.

1. Vibrations and impacts

2. Static electricity

3. Rough handling

1.1 Handling in transport, etc.

s Be sure to place the HDD in the manufacturer's specified package

carton before transport.

s When receiving a package containing an HDD, check that the pac k-

age carton is not damaged (such as having holes in the carton, crushed corners, etc.).

s Do not impact the packaging carton when loading or unloading it. s It is not permitted to use the inner package carton only for transport-

ing an HDD.

s Do not stack package cartons one upon another.

Be sure to package and transport the HDDs correctly.

HDD Do not throw or drop packages.

1.2 Handling an HDD in the stand-alone status

s When handling an HDD on a hard workbench, place an antistatic

mat (rubber sheet) or similar object on the hard surface (to prevent any impacts occurring between the HDD and bench).

s Do not stack the HDDs one upon another. s Do not knock an HDD with a hard object (such as a screwdriver). s Do not place an HDD on its side panel without using a support (do

not place an HDD in an unstable position).

1.3 Handling the installation of an HDD

s Place antistatic mats or similar sheets on all of the surfaces on which work is conducted or when the HDD

is transported.

s Do not permit the HDD to knock against the set's brackets. s When screwing the brackets, be careful not to knock the HDD. When using a po wer scre wdriver , use a lo w-

shock model and arrange the tightening torque properly.

s When mounting an HDD in a HDD/VHS DUAL RECORDER, take care not to apply excessive force to the

brackets.

SECTION 1

DISASSEMBLY

1.1 Before disassembling.

1.1.1 SYSTEM INFORMATION display

By transmitting the code "7F" from JIG RCU, SYSTEM INFORMATION can be seen. Mainly, SYSTEM INFORMATION is used for the version check. To exit SYSTEM INFORMATION, transmit the code "7F" from JIG RCU again.

Fig. 1-1-1-1a SYSTEM INFORMATION DISPLAY

Jig RCU [Data transmitting method]

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

CUSTOM CODE 43: A CODE 53: B CODE 6F: C CODE 7F: D CODE

DATA CODE

INITIAL MODE

Fig. 1-1-1-1b Jig RCU [PTU94023B]

1.1.2 STANDALONE mode

When a HDD/VHS DUAL RECORDER AC cord is plugged into a power outlet, the boot loader is read from the IC8204 (8M FLASH ROM), which activates the HDD and reads the system files in the HDD before getting ready for operation. In consequence, the HDD/VHS DUAL RECORDER cannot be turned on if the HDD fails. In case a failure of the HDD is in doubt, use the following procedure to switch the main power of the set ON using the VHS section alone, by bypassing the HDD operation check.

(1) With the HDD/VHS DUAL RECORDER in the remote con-

trol standby status, transmit code "AE" from the Jig RCU for more than 2 seconds. When HDD/VHS DUAL RECORDER is STANDALONE mode, the symbol("

") is flashing at the FDP.

(2) Transmit the code "AE" from Jig RCU again, then

STANDALONE mode is cancelled.

(3) Turn off the power, and pull out the power cord from power

outlet.

Note:

• When canceling STANDALONE mode, surely pull out the AC cord from power outlet once to reset the Host CPU.

1.1.3 Jig RCU mode

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

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

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

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

Note:

• Confirm the RCU mode when exchanged parts. Since

some SERVICE PARTS sets the VCR to the Jig RCU mode as initial setting.

1.1.3.1 Setting the Jig RCU mode

(1) Set the STANDALONE mode by transmitting the cord "AE"

from the Jig RCU.

(2) Transmit the cord “MENU”, “2” , “8”, “OK” from the provided

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

” ) is flashing at the FDP.

( “

1.1.3.2 Setting the User RCU mode

(1) Turn off the power. (2) Transmit the cord "80" from the Jig RCU. (3) Cancel the STANDALONE mode by transmitting the cord

"AE" from the Jig RCU again.

(4) Pull out the AC cord from the power outlet.

Note:

• Set the VCR to the STANDALONE mode before setting the

VCR to the Jig RCU mode.

• When canceling STANDALONE MODE, surely pull out the

AC cord from power outlet once to reset the host CPU.

1.1.3.3 Table of JIG RCU cord

Command Cord

SYSTEM INFORMATION DISPLAY ON/OFF STANDALONE mode ON/OFF Jig RCU mode OFF 80 unusable usable EMERGENCY DISPLAY 59 unusable usable MECHANISM SERVICE MODE ON EVR mode (VHS) ON/OFF 57 unusable usable EVR mode (HDD) ON/OFF 95 usable unusable

Flashing when VCR is STANDALONE mode

Flashing when VCR is Jig RCU mode.

STANDALONE

mode

OFF mode ON

7F usable unusable AE usable usable

E5 unusable usable

Jig RCU

Fig. 1-1-3-3a STANDALONE mode / Jig RCU mode

1-1

1.1.4 Manually removing the cassette tape

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

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

the disassembly of the major parts before removing the mechanism assembly. (See Fig. 1-1-4a)

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

of the loading motor until the pole base assembly is hidden behind the cassette lid. In doing so, hold the tape by the hand to keep the slack away from any grease. (See Fig. 1-1-4b.) In case of mechanical failures, while keeping the tension arm assembly free from tension, pull out the tape on the pole base assembly. Take the spring(a) of the pinch roller arm

assembly off the hook, and detach it from the tape. (4) Remove the screw (a) of the side frame (L/R). (5) Hold the slack tape and cassette cover together, lift the cas-

sette tape, top frame, cassette holder and side frames (L,

R) together from the rear and remove them by dis-engaging

the hooks (a) and (b).

Tension arm assembly

Pole base assembly

Fig. 1-1-4a

Pinch roller arm assembly

Screw(a)

Cassette tape

Hook(a)

Side frame(L)

Cassette holder

Top frame

Side frame(R)

Screw(a)

Hook(b)

Fig. 1-1-4c

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

pletes removal of the cassette tape.

1-2

Spring(a)

Direction of unloading

Fig. 1-1-4b

1.2 Removing the major parts

1.2.1 How to read the procedure table

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

Step/

Loc No.

[1] Top cover, 1-3a

(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

1.2.2

Disassembly procedure

Step/

Loc No.

[1] TOP COVER [2] FRONT

[3]

[4] REAR PANEL

[5]

[6] HDD

[7]

[8]

Part Name

PANEL assembly

(S JACK board assemby) (LED/SW board assembly)

(ADV.JOG board assembly) MECHANISM assembly

(DRUM assembly)

(INERTIA PLATE) 4(L3a) (ROLLER ARM assembly)

(FAN MOTOR) 2(S4d) MAIN board assembly

(TERMINAL board assembly)

DIGITAL board assembly

SW REG board assembly

Fig. No.

1-2-2d 1-2-2a

1-2-2d

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

1-2-2d

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

1-2-2b 1-2-2c

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

1-2-2d

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

1-2-2d

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

1-2-2d

Point Note 2(S1a), 4(S1b) CN7003(WR2a), <Note 2a>

CN3011(WR2b), <Note 2b> 2(L2a), (L2b), 5(L2c)

2(S2b) 5(S2c),3(S2d)

KNOB assembly CN2001(WR3a), <Note 2a>

3(S3a), (S3b), <Note 3a> CN(WR3b), <Note 3b>

(S3x), (S3y), (S3z)

(L3b), (P3a) CN5304(WR4a) <Note 2a>

2(S4a),6(S4b) (L4a),3(L4b)

CN701(WR5a), <Note 2a> CN7509(WR5b), CN7511(WR5c), 3(S5a)

CN901(WR5d) CN903 CN702 CN703 CN704 CN705 CN706

(WR6a),(WR6b), <Note 2a> (S6a),4(S6b),4(S6c), (WR6c),(WR6d), SHIELD PLATE(WIND) BRACKET(HDD)x2

CN5305(WR7a), <Note 2a> 2(S7a),2(S7b)

4(S8a)

1-3

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

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

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

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

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

Door opener

• When reattaching the Drum assembly, secure the screws (S3x to S3z) in the order of x, y, z.

Mechanism assembly

(S3y)

(S3x)

(S3z)

Drum assembly

(S3y)

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

(S3x)

(S3z)

HOOK

Fig. 1-2-2b

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

Switch knob

Switch lever

Side frame(R)

Fig. 1-2-2a

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

• When reattaching the Mechanism assembly, set the “Mechanism assembling mode”. (See “section 2 mechanism”.)

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

NOTE) Insert Longer-Supported-End of (WR5a) to TERMINAL BOARD ASSEMBLY.

TERMINAL BOARD ASSEMBLY

CN901

Make a crease.

(WR3a)

· Be careful to insert that will not be slanting.

A/C HEAD

(WR5a)

right side

(WR2a)

MAIN BOARD ASSEMBLY

CN7003

From S-JACK BOARD ASSEMBLY

(WR3b)

right side

CN701

CN7507

(WR5d)

Make a crease.

(WR2b)

Video heads

The power code not touch the power supply PRIMARY side and the mechanics chassis.

(WR4a)

SW REG BOARD ASSEMBLY

(WR5b)

right side

Pass the inside of (WR6a)

(WR5c) <Note 2a>

CN602

CN603

This Wire should be loose at front side,and be tight at rear side.

through (WR7a) wire.

CONNECTOR Color:Blue

right side

HDD

DIGITAL BOARD ASSEMBLY

(WR6a)

Motor

Fig. 1-2-2c

NEUTRAL (WHITE LINE)

Shaft

NOTE) Pay attention (WR5a) and (WR5c) Wires are not under HDD when assembling HDD.

bend

(WR5c)

CN602

DIGITAL BOARD ASSEMBLY

DRAWING FROM DIRECTION

(WR5d)

3cm

about 2

bend

CN7507

DRAWING FROM DIRECTION

(WR5a)

CN603

back side

FIG.4

TERMINAL BOARD

ASSEMBLY

(WR5a)

MAIN BOARD ASSEMBLY

FIG.3

3cm

about 2

1-4

WIRING

CN5001

CN5304

FIG.2

TOP SIDE

BOTTOM SIDE

TOP SIDE

REAR SIDE

"A"

"C"

"B"

JS3001

(S3a)

(S2a)

(L4b)

(S3a)

(L3a)

(S3y)

(S3x)

(L2a)

(L2b)

(L2c)

(S3z)

(S3a)

[1] TOP COVER

(S1a)

[3] INERTIA PLATE

(S2d)

(S2c)

(WR2b)

(S2c)

CN7002

From MAIN BOARD ASSEMBLY

(S2c)

(S2b)

(WR2a)

CN7004

[4] REAR PANEL

(S4b)

(S4d)

(S4a)

(L4a)

(L4b)

[4] FAN MOTOR

(S5a)

D3001

JS3001

Q3002

BOTTOM CHASSIS

BRACKET(CENTER)

STUD(DIGI BOARD ASSY)

(S6a) SHIELD PLATE(WIND)

(S6b)

(S6c)

(WR6c)

(WR6d)

(S7b)

(S6c)

CN202

(S7a)

(S8a)

BRACKET(HDD)

(S6b)

(S1b)

(S1a)

(L3b)"b"

(P3a)"c"

to "X"

to "W"

[3] DRUM ASSEMBLY

[3] MECHANISM

ASSEMBLY

NOTE) Shift C.HOUSING away and screwing. After that shift it back to origin.

Hold part of roller arm assembly while attaching inertia plate. Inertia plate should be attached so as to ser small diameter of central round hole above.

1. position roller's installation hole in the "A" part.

2. insert roller until the "b" part of roller's hook lock up to the "B" part.

3. hitch the "c" part of spring to the "C" part.

[3] ROLLER ARM

ASSEMBLY

[2] FRONT PANEL

ASSEMBLY

NOTE) Pay close attention not to destroy S7016(EJECT) of MAIN PWB, when assembling FRONT PANEL.

[2] KNOB ASSEMBLY

[2] LED/SW BOARD

ASSEMBLY

[2] ADV.JOG BOARD

ASSEMBLY

[2] FRONT PANEL

ASSEMBLY

back side

[2] S-JACK BOARD

ASSEMBLY

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

NOTE) When you fix any pwb with the screw, put it on the jigs.

DRAWING FROM DIRECTION

[2] LED/SW BOARD

ASSEMBLY

[5] MAIN BOARD

ASSEMBLY

[5] TERMINAL BOARD

ASSEMBLY

NOTE) Pay attention MAIN PWB is not under these part,when assembling MAIN PWB.

NOTE) Use Low-Impact Driver for (S6b) and (S6c).

Three Bond(1401B/C) glue

BRACKET hole

HDD hole

NOTE) Glueing is as follows.Screw (S6c) after glueing.(refer to below)

[6] HDD

[7] DIGITAL BOARD

ASSEMBLY

[8] SW.REG BOARD

ASSEMBLY

NOTE) This fix to the hole on TOP FRAME of C.HOUSING, And screwing (S2a) while support BRACKET(CENTER) by hand.

NOTE) It tightens up (WR6d) and a PWB together in (S7a). Be careful so as not for this wire to be caught in TOP COVER installation.

NOTE) It tightens up (WR6c) and a PWB together in (S7b). The CN202 part, and the approaching pattern and the wire draw the style which doesn't contact around.

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

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

FRONT PANEL ASSEMBLY

[2] ADV.JOG BOARD

ASSEMBLY

FIGURE(1,2,3) WHICH HAS ACCOMPANIES THE SCREW MARK SHOWS THE ORDER OF SCREWING.

NOTE

Fig. 1-2-2d

1-5

1.3 Emergency display function

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

Jig RCU

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

CUSTOM CODE 43: A CODE

DATA CODE

INITIAL MODE

0: 00 : 00

E:**:**

*1: *2 : 34

*5: *6 : *7

*8: *9 : *10

Normal display (Counter or clock)

EMG content display (E:Latest:Previous) See 1.3.4. [EMG code display mode]

EMG detail information <1> display See 1.3.5. [Deck and other mode display mode]

EMG detail information <2> display See 1.3.6. [Cassette display mode]

EMG detail information <3> display See 1.3.7. [Deck mode history dispaly mode]

Fig. 1-3-1b EMG display of FDP display model

Fig. 1-3a Jig RCU [PTU94023B]

1.3.1 Displaying the EMG information

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

Note:

•

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

0: 00

E: **

1E: **

1: *1

2: *2

3: 34

4: *5

5: *6

6: *7

7: *8

8: *9

9: *10

Normal display

EMG content display (Latest) See 1.3.4.

EMG content display (Previous) See 1.3.4.

EMG detail information <1> See 1.3.5. [Deck operation mode] EMG detail information <1> See 1.3.5. [Mechanism operation mode] EMG detail information <1> See 1.3.5. [Mechanism sensor information and Mechanism mode position] EMG detail information <2> See 1.3.6. [Type of the cassette tape in use <1>] EMG detail information <2> See 1.3.6. [Winding position of the cassette tape in use] EMG detail information <2> See 1.3.6. [Type of the cassette tape in use <2> (Winding area)] EMG detail information <3> See 1.3.7. [Previous deck operation mode] EMG detail information <3> See 1.3.7. [The deck operation mode of the one before the last] EMG detail information <3> See 1.3.7.

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

Fig. 1-3-1a EMG display of 7segment LED display model

<Reference> EMG display of FDP display mode

(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.

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

* 8 : Previous deck operation mode at the moment of

EMG

*9 : The deck operation mode of the one before the last

at the moment of EMG

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

above at the moment of EMG

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

set the display.

1.3.2 Clearing the EMG history

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

1-6

1.3.3 Details of the OSD display in the EMG display mode

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

Notes:

•

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

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

•

The sensor information in the OSD display contents is par-

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

[For *HD only]

AA BB CC DD EE FF

GGGG HHHH

I I JJJJ

KKKK LLLL MMMM

ROM No.

[For MN* only]

AA BB CC DD EE

FF GG HH I I J J KK LL MM NN OO PP QQ RR SS TT UU VV WW XX YY

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

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

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

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

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

YY : General data display area

*FF: Sensor information details

** h

********

Encoder data (See Mechanism mode sequence.)

Cassette tab present = 1 Cassette tab broken = 0

Cassette absent = 1 Cassette present = 0

Start sensor

End sensor

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

Mechanism operation mode (See EMG detail information <1>.)

CC : DD : Sensor information (See sensor information details.) EE : Capstan motor speed (Search, double speed)

F F : Tracking value

GGGG: Cassette tape type <2>, 16 bits.

(See EMG detail information <2>.)

HHHH : Supply reel winding diameter data

I I : Capstan motor speed (FF/REW, double speed) JJJJ: Tape speed data, lower 8 bits. KKKK : General data display area LLLL : General data display area

MMMM : General data display area

*DD: Sensor information details

** h

********

Encoder data (See Mechanism mode sequence.)

Remote pause

End sensor

Start sensor

Cassette tab present = 1 Cassette tab broken = 0

[For both MN*/HD*]

Mechanism mode sequence

Mechanism mode - Encoder data

LSA LSB LSC LSD

No. Position Encoder data

Encoder output = Low

Trerminal - GND = SHORT

EJECT 0 h = 0000

EJECT1 1 h = 0001

EJECT2 2 h = 0010

ULSTOP 3 h = 0011

UPPER 4 h = 0100

ONSTOP(PLAY) 5 h = 0101

FWD/SS 6 h = 0110

REV/SS 7 h = 0111

OFFSTOP 8 h = 1000

FFREW-BRAKE 9 h = 1001

FFREW A h = 1010

MIDDLE F h = 1111

543

Encoder output = High

Trerminal - GND = OPEN

LSD

9876

LSC

LSB

LSA

12345

1110

GND

1-7

1.3.4 EMG content description Note:

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

FDP CONTENT CAUSE

E01: Loading EMG

E02:

Unloading EMG

E03: Take Up Reel

Pulse EMG

E04: Drum FG EMG

E05: Cassette Eject

EMG

E06: Capstan FG

EMG

E07:SW Power

Short-Circuit EMG

E08:

DD Initialized (Absolute Position Sensor) EMG

E09: DD FG EMG

E0A: Supply Reel

Pulse EMG

EU1: Head clog warning history

1-8

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

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

When the falling edje of the take-up reel pulse has not been generated for more than 4 seconds in the capstan rotating mode, [E:03] is identified, the pinch rollers are turned off and stopped, and the power is turned off. In this case, however, the mechanism should be in position after tape loading. Note that the reel EMG is not detected during Slow/Frame advance operations.

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

If the cassette does not reach the eject position within about 0.7 seconds after the cassette housing has started the cassette ejection operation, [E:05] is identified, the drive direction is reversed to load the tape, the mode is switched to STOP mode with the pinch roller OFF, and the power is switched OFF. During the cassette insertion process, the drive direction is reversed and the cassette is ejected if the tape is not up against the pole base within about 3 seconds after the start of the cassette pullingin operation. If the cassette does not reach the eject position within about 0.7 seconds after the drive mode reversal operation, [E:05] is identified and the power is switched OFF immediately.

When the capstan FG pulse has not been generated for more than 1 second in the capstan rotating mode, [E:06] is identified, the pinch rollers are turned off and stopped, and the power is turned off.However, the capstan EMG is not detected in SLOW/ STILL modes. Note that, if the part number of the System Control IC begins with “MN” or “M3”, the capstan EMG is not detected even during the FF/REW operation.

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

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

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

When the falling edge of the supply reel pulse has not been generated for more than 10 seconds in the capstan rotating mode, [E:0A] is identified and the cassette is ejected (but the power is not turned off). In this case, however, the mechanism should be in the position after tape loading (with the tape up against the pole base). Also note that the reel EMG is not detected during Slow/ Frame advance operations.

Presupposing the presence of the control pulse output in the PLAY mode, when the value obtained by mixing the two V.FM output channels (without regard to the A.FM output) has remained below a certain threshold level for more than 10 seconds, [E:U1] is identified and recorded in the emergency history. During the period in which the head clog is detected, the FDP shows "U:01" and the OSD repeats the “3 seconds of warning display” and the “7 seconds of noise picture display” alternately.

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

1. The mechanism is locked in the middle of the mode transition during a tape loading operation.

The mechanism overruns during the tape loading operation because the SYSCON cannot recognize the mechanism mode normally. This problem is due to a cause such as a rotary encoder failure.

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

The mechanism is locked in the middle of mode transition.

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

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

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

1)The idler gear is not meshed with the take-up reel gear because the mechanism malfunctions for some reason.

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

too large mechanical load (abnormal tension);

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

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

1) The idler gear is not meshed with the supply reel gear because the mechanism mal-

functions for some reason.

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

too large a mechanical load (abnormal tension);

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

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

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

1) The tape tension is abnormally high;

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

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

1) The signal circuit is disconnected in the middle;

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

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

Power (M12V) is not supplied to the drum MDA.

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

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

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

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

The loading motor drive voltage is lower than specified or power (M12V) is not supplied to the motor (MDA).

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

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

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

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

rence of tape entangling, etc.).

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

1) The signal circuit is disconnected in the middle;

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

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

Power (M12V, SW5V) are not supplied to the capstan MDA.

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

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

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

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

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

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

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

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

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

4. The power (5V) to the sensor is not supplied. (Connection failure/soldering failure)

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

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

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

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

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

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

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

the middle;

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

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

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

sensor failure.

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

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

in the middle;

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

the cassette shell. In this case, the take-up 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 reel is rotating normally but the FG pulse is not generated due to a take-up reel

sensor failure.

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

Table 1-3-4a

1.3.5 EMG detail information <1>

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

[FDP/OSD display]

*1 : *2 : 34

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

e position at the moment of EMG

Note:

•

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

*2 : Mechanism operation mode [Table of MN*]

Display

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

Mechanism operation mode

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

Display

MN* HD*

00 - Mechanism being initialized 01 00 STOP with pinch roller pressure off (or tape present with P.OFF) 02 01 STOP with pinch roller pressure on 03 - POWER OFF as a result of EMG 04 04 PLAY (Normal playback)

0C 0E REC

10 11 Cassette ejected 20 22 FF 21 - Tape fully loaded, START sensor ON, short FF 22 - 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

[Table of HD*]

Display

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

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

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

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

pressure on) FF Tape being unloaded

Mechanism operation mode

1-9

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

Display

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

REC safety SW

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

Mechanism sensor information

Start sensor End sensor

OFF

OFF OFF

ON OFF OFF

ON OFF

ON OFF OFF OFF

Mechansim

position sensor

OFF

*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.

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

Mechanism

sensor

information

Display

Deck operation mode

-0 Not established

-1 EJECT EJECT position

-2 EJECT-EJECT1 Intermodal position

-3 EJECT1 EJECT1 position

-4 EJECT1-EJECT2 Intermodal position

-5 EJECT2 EJECT2 position

-6 EJECT2-ULSTOP Intermodal position

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

-7 ULSTOP ULSTOP position

-8 ULSTOP-UPPER Intermodal position

-9 UPPER Loading (unloading) tape

-A UPPER-ONSTOP Intermodal position

-B ONSTOP PLAY position

-C PLAY-FWD/SS Intermodal position

-D FWD/SS

FWD (FWD Still/Slow) position

-E FWD/SS-REV Intermodal position

-F REV

REV (REV Still/Slow) position

-0 REV-OFFSTOP Intermodal position

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

-2

OFFSTOP-FFREWB

Intermodal position

-3 FFREWB FF/REW Brake position

-4 FFREWB-FFREW Intermodal position

-5 FFREW FF/REW position

1.3.6 EMG detail information <2>

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

[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.

*6 : Cassette tape winding position

The cassette tape winding position at the moment of EMG is displayed by dividing the entire tape (from the beginning to the end) in 21 sections using a hex number from “00” to “14”.

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

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

Display

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

Cassette tape type <2>

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

(Reference) Word data (Beginning) (End)

(0497 - 0506) (0732 - 0858)

(05A9 - 0661)

(0599 - 05FF) (0AA1 - 0C07)

(0623 - 063D) (0C41 - 0CC3)

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

(07CC - 08E5) (09FD - 0B78)

(0C20 - 0DFC)

(0D31 - 0F3E)

(0E43 - 107F)

(10E1 - 120C)

(1073 - 1313) (1185 - 1429) (12D3 - 141F) (1373 - 14C3) (1357 - 14C0) (1395 - 14EE)

(13A8 - 14CE)

(1536 - 1618) (1647 - 175A) (1759 - 189C) (1989 - 1B2F)

Note:

•

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

1.3.7 EMG detail information <3>

Three deck operation modes preceding the deck operation mode in which the EMG occurs may be confirmed based on the figures in the EMG information detail <3>. For the contents of the displayed information, see the table "Deck operation mode" in section "1.3.5 EMG detail information <1>".

1-10

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 Mechanism assembly.

(2) Remove the screws that fix the Mechanism assembly to the

Chassis assembly. If any other screws are used to fix the boards, remove them also.

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

blies. (4) If any other major parts are used, remove them also. (5) Connect the wires and connectors of the major parts that

have been removed in steps (1) to (4). (Refer to Fig. 1-2-2d.) (6) Place the combined Mechanism, Main board and other

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

proceed with the diagnostics and servicing of the board as-

sembly.

Notes:

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

let, make sure that none of the electrical parts are able to short-circuit between the workbench and the board assembly.

• For the disassembly procedure of the major parts and de-

tails of the precautions to be taken, see “1.2 Removing the major parts”.

• If there are wire connections from the Main board and

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

• When carrying out diagnosis and repair of the Main board

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

• In order to diagnose the playback or recording of the cas-

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

• For some models, the mechanism and board assemblies

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

SW.REG board assembly

DIGITAL board assembly

TERMINAL board

assembly

2D DIGITAL board assembly

MAIN board

assembly

DEMODULATOR board assembly(VR1502 ST.SEP.)

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

from the Jig RCU can be received). (2) Transmit the code “E5” from the Jig RCU. (3) Release the lug of the Cassette holder and then slide the

Cassette holder toward the direction where the Cassette

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

pleted, the mechanism enters the desired mode. When the VCR is set to the Mechanism service mode, the

symbols (“Timer”) in the FDP (LED) are blinked.

1.5.2 How to exit from the "Mechanism service mode"

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

ADV.JOG board

assembly

FRONT board

assembly

Fig. 1-4-1a

VR2251 A.REC FM ADJ.

TP111 D.FF

TP4001 CTL.P

TP106 PB.FM

TP2253 A.PB FM

TP2254 A.REC FM

S JACK board

assembly

1-11

1.6 Maintenance and inspection

1.6.1 Cleaning

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

Note:

Absolutely avoid sweeping the upper drum vertically as

•

this will cause damage to the video head.

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

soak a piece of closely woven cloth with alcohol and while holding the cloth onto the upper drum by the fingers, turn the upper drum counterclockwise.

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

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

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

pletely dry before using the cassette tape.

A/C head

Video heads

Fig. 1-7-1a

1.6.2 Lubrication

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

Note:

•

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

1.6.3 Suggested servicing schedule for main components

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

System Parts name

Drum assembly A/C head Pinch roller arm assembly

Tape transport

Drive

Other

Full erase head Tension arm assembly Capstan motor (Shaft) Guide arm assembly Capstan motor Capstan brake assembly Main brake assembly Belt (Capstan) Loading motor Clutch unit Worm gear Control plate Rotary encoder

Operation hours

1000H

C,X C,X

C C C C C

2000H

C,X

C C C C C X X X X X X X X X

C : Cleaning X : Inspection or Replacement if necessary

SECTION 2

MECHANISM

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

MECHANISM ASSEMBLY

1-12

SECTION 3

ADJUSTMENT

3.1 Before adjustment

3.1.1 Precaution

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

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

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

3.1.2 Required test equipments

• Color (colour) television or monitor

• Oscilloscope:

wide-band, dual-trace, triggered delayed sweep

• Signal generator: RF / IF sweep / marker

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

• Recording tape

• Digit-key remote controller(provided)

3.1.3 Required adjustment tools

: Used : Not used

Electrical

adjustment

PUJ48076-2

Alignment tape

(EP, stairstep, NTSC)

MHP-L

Roller driver Jig RCU Back tension cassette gauge Alignment tape(MHPE) Alignment tape(MHPE-L) Alignment tape(MHP-L)

Roller driver

PTU94002

Alignment tape

(SP, stairstep, PAL)

MHPE

Jig RCU

PTU94023B

Alignment tape

(LP, stairstep, PAL)

MHPE-L

Machanism

compatibility

adjustment

Back tension cassette gauge

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

3.1.4

Color(colour) bar signal [PAL]•

•

Horizontal sync

White(75%)

0.7 V

0.3 V

White(100%)

Yellow

Cyan

Green

Magenta

Red

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

Blue

Burst

Color(colour) bar pattern [PAL]

(75%)

Cyan

0.3 V

White

U Black

Yellow

White 100%

Green

Magenta

Red

Blue

3.1.5 Switch settings

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

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

Jig RCU [Data transmitting method]

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

CUSTOM CODE 43: A CODE

DATA CODE

INITIAL MODE

Fig. 3-1-5a Jig RCU [PTU94023B]

•

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

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

PICTURE CONTROL/SMART PICTURE VIDEO STABILIZER OFF TBC ON Digital 3R ON VIDEO NAVIGATION/TAPE MANAGER

BLUE BACK OFF

OFF

NORMAL/NATURAL

OFF

3-1

3.1.6

Manual tracking mode (Auto tracking ON/OFF) setting

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

playback, press the “SP/EP(LP)” button on the remote control unit.

• Each press of the button switches the auto tracking ON or OFF.

• When the auto tracking is OFF, the monitor screen displays “AT: OFF”.

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

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

3.1.7 EVR adjustment

Some of the adjustments require the adjustment performed by the EVR system. The main unit have EEPROMs for storing the EVR adjustment data and user setups.

Notes:

• In the EVR adjustment mode, the value is varied with the channel buttons (+, –). The adjusted data is stored when the setting mode changes (from PB to STOP, when the tape speed is changed, etc.). Take care to identify the current mode of each adjustment item when making an adjustment.

• When changing the address setting in the EVR adjustment mode, use the Jig RCU or the remote controller having numeric keypad with which a numeric code can be directly input. The remote control code of the Jig RCU corresponds to each of the digit keys on the remote controller as follows.

Digit-key 0 1 2 3 4 5 6 7 8 9 Code 20 21 22 23 24 25 26 27 28 29

• As the counter indication and remaining tape indication are not displayed FDP during the EVR adjustment mode, check them on the TV monitor screen.

• When performing the EVR adjustment, confirm that the FDP indication is changed to the EVR mode, as shown below.

3.2 Mechanism compatibility adjustment Notes:

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

• To prevent damaging the alignment tape in the compatibility adjustment, prepare a cassette tape (for self-recording/playback), perform a test on it by transporting it and making sure that the tape is not bent by the tape transport mechanisms such as in the guide rollers.(See Fig.3-2-2a.)

3.2.1 Tension pole position

Notes:

•

This adjustment must be performed every time the tension band is replaced.

Signal (A) • Back tension cassette gauge Mode (B1) • PB

(B2) •Eject end Adjustment part (F) • Adjust pin [Mechansim assembly] Specified value (G) • 25 - 51 gf•cm (2.45 – 5 × 10-3 Nm)

[PUJ48076-2]

(1) Play back the back tension cassette gauge (A). (2) Check that the indicated value on the left side gauge is

within the specified value (G).

(3) If the indicated value is not within the specified value (G),

perform the adjustment in a following procedure.(See Fig.3-2-1a.)

1) Remove the top frame, cassette holder and side frames (L/R) all together. (See “section 2 mecha-nism”.)

2) Rotate the loading motor gear to move the control plate so that the triangular stamping to the left of the “P” stamping is aligned with the stamping (a) on the main deck. This positioning is mode (B1).

3) Adjust by turning the adjustment pin so that the tip of the tension arm is aligned with the stamping (b) on the main deck.

4) Rotate the reel disk (S) by about one turn clockwise and make sure that the round hole of the adjustment pin is located in the “OK” range. If it is outside this range, restart the adjustment from the beginning.

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

3-2

FDP

Fig. 3-1-7a EVR mode

TENSION ARM

Stamping(b)

ADJUST PIN

CONTROL PLATE

Stamping(a)

Fig. 3-2-1a

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

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

the V.PB FM waveform at the measuring point (D). (3) Set the VCR to the manual tracking mode. (4)

Make sure that there is no significant level drop of the V.PB

FM waveform caused by the tracking operation, with its

generally parallel and linear variation ensured. Perform the

following adjustments when required. (See Fig. 3-2-2b.) (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. 3-2-2b.) (6) Make sure that the V.PB FM waveform varies in parallel

and linearly with the tracking operation again. When re-

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

pole base assembly (supply or take-up side). (7) Unload the cassette tape once, play back the alignment

tape (A1) again and confirm the V.PB FM waveform. (8)

After adjustment, confirm that the tape wrinkling does not

occur at the roller upper or lower limits. (See Fig. 3-2-2a.)

[Perform adjustment step (9) only for the models

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

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

Improper

Proper

• Proper waveform variation

• Improper waveform variation

Up Down

Roller driver

Guide roller (supply side)

Fig. 3-2-2b

3.2.3 Height and tilt of the A/C head Note:

• Set a temporary level of the height of the A/C head in advance to make the adjustment easier after the A/C head has been replaced. (See “section 2 mechanism”.)

Signal (A) • Mode (B) • PB Equipment (C) • Oscilloscope Measuring point (D1) • AUDIO OUT terminal

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

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

(D2) • TP4001 (CTL. P)

(a) GUIDE ROLLER

(b) GUIDE POLE

Fig. 3-2-2a

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

the AUDIO OUT waveform and Control pulse waveform

at the measuring points (D1) and (D2) in the ALT mode. (3) Set the VCR to the manual tracking mode. (4) Adjust the AUDIO OUT waveform and Control pulse

waveform by turning the screws (1), (2) and (3) little by

little until both waveforms reach maximum. The screw (1)

and (3) are for adjustment of tilt and the screw (2) for azi-

muth.

Head base

(2)

A/C head

(3)

(1)

AUDIO OUT

CTL. P

Fig. 3-2-3a

3-3

3.2.4 A/C head phase (X-value)

Signal (A1) •

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

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

A/C head base [Mechanism assembly]

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

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

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

3-2-4a.) (5) Rotate the roller driver so that the A/C head comes clos-

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

gradually toward the drum until the point where the FM

waveform is maximized for the second time, and then

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

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

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

FM waveforms are maximized when the tracking is at the

center position.

To the drum

Toward the capstan

Toward the drum

A/C head

Screw (5)

Roller driver

Screw (4)

Head base

To the capstan

3.3 Electrical adjustment Note:

The following adjustment procedures are not only necessary after replacement of consumable mechanical parts or board assemblies, but are also provided as references to be referred to when servicing the electrical circuitry. In case of trouble with the electrical circuitry, always begin a service by identifying the defective points by using the measuring instruments as described in the following electrical adjustment procedures. After this, proceed to the repair, replacement and/or adjustment. If the required measuring instruments are not available in the field, do not change the adjustment parts (variable resistor, etc.) carelessly.

3.3.1 Servo circuit

3.3.1.1 Switching point

Signal (A1) • Stairstep signal

(A2) •

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

Mode (B) • PB

• TBC:OFF Equipment (C) • Oscilloscope Measuring point (D1) •

VIDEO OUT terminal (75Ø terminated)

(D2) • TP106 (PB. FM) External trigger (E) • TP111 (D.FF) Adjustment part (F) • Jig RCU: Code “5A” Specified value (G) • 7.5 ±0.5 H Adjustment tool (H) • Jig RCU [PTU94023B]

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

VIDEO OUT waveform and V . PB FM waveform at the meas-

uring points (D1) and (D2). (3) Set the VCR to the manual tracking mode. (4) Adjust tracking so that the V. PB FM waveform becomes

maximum. (5) Set the VCR to the Auto adjust mode by transmitting the code

(F) from the Jig RCU. When the VCR enters the stop mode,

the adjustment is completed. (6) If the VCR enters the eject mode, repeat steps (1) to (5) again. (7) Play back the alignment tape (A2) again, confirm that the

switching point is the specified value (G).

Trigger point

Switching point

V.sync

Fig. 3-2-4a

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

Waveform output

X-value adjustment point

Drum side Control head position Capstan side

Fig. 3-2-4b

3-4

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

Maximum

V. rate

Fig. 3-3-1-1a Switching point

3.3.1.2Slow tracking preset

H. rate

Y level

Signal (A1) • Ext. input

Mode (B1) • VHS SP

Measuring point (D) • TV-Monitor Adjustment part (F) • Jig RCU: Code “71“ or “72” Specified value (G) • disappear noise Adjustment tool (H) • Jig RCU [PTU94023B]

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

(B2) • VHS LP

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

the recorded signal. (2) Set the VCR to the manual tracking mode. (3) Set the VCR to the FWD slow (+1/6x) mode. (4) Transmit the code (F) from the Jig RCU to adjust so that

the noise bar becomes the specified value (G) on the TV

monitor in the slow mode. (5) Set the VCR to the Stop mode. (6) Confirm that the noise bar is (G) on the TV monitor in

the slow mode. (7) Repeat steps (3) to (6) in the REV slow (–1/6x) mode. (8) Repeat steps (1) to (7) in the mode (B2).

Note:

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

•

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

3.3.2 Video circuit

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

Signal (A1) • Ext. S-input

Mode (B1) • EE SP

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

EVR address (F2) • A : 11

Specified value (G) • 1.00 ± 0.05 Vp-p Adjustment tool (H) • Jig RCU [PTU94023B]

(A2) •Ext. input (A3) •Color (colour) bar signal [PAL]

(B2) •S-VHS SP (B3) •VHS SP

(F3) • Jig code “21” twice (F4) • Jig code “18” or “19” (Channel +/-)

(1) Input the signal (A3) from the input point (A1). (2) Set the VCR to the mode (B1). (3) Observe the Y OUT waveform at the measuring point (D). (4) Set the VCR to the EVR mode by transmitting the code

(F1) from the Jig RCU.

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

from the Jig RCU.

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

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

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

code (F1) from the Jig RCU again. (When the EVR mode

is released, the adjusted data is memorized.) (8) Input the signal (A3) from the input point (A2). (9) Repeat steps (3) to (7) in the mode (B1).

(10)Record the signal (A3) in the mode (B2), and play back

the recorded signal. (11)Set the VCR to the manual tracking mode. (12)Repeat steps (3) to (7) in the mode (B2). (13)Record the signal (A3) in the mode (B3), and play back

the recorded signal. (14)Set the VCR to the manual tracking mode. (15)Repeat steps (3) to (7) in the mode (B3).

Fig. 3-3-2-1a EE/PB Y level

3.3.3 Audio circuit Notes:

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

case.

3.3.3.1 Audio REC FM

Signal (A1) • Ext. input

Mode (B) • S-VHS LP Equipment (C) • Oscilloscope Measuring point (D) • TP2253 (A. PB. FM) External trigger (E) • TP111 (D.FF) Adjustment part (F) • VR2251 Specified value (G1) • 700 ± 100 mVp-p

(A2) •Audio: No signal (A3) •

(G2) •More than 450 mVp-p

Video: Color (colour) bar signal [PAL]

(1) Apply the external trigger signal to D.FF (E) to observe

the Audio PB FM waveform at the measuring point (D).

(2) Record the signal (A3) with no audio signal input in the

mode (B), and play back the recorded signal. (3) Set the VCR to the manual tracking mode. (4) If the A.PB FM level is not within the specified value (G1),

perform the adjustment in a following procedure. (5) Adjust the Adjustment part (F) so that the A. PB FM level

of the higher channel level becomes the specified value

(G1). (Adjust before recording, then confirm it by playing

back.) (6) If the specified value (G1) is not obtained, adjust the Ad-

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

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

before recording, then confirm it by playing back.)

Specified value (G2)

V. rate

Specified value (G1)

Fig. 3-3-3-1a Audio REC FM

3-5

3.3.4 Digital circuit Note:

•

Perform this adjustment after "EE Y LEVEL" adjustment.

•

This adjustment can not perform at the STANDALONE mode. Cancel the STANDALONE mode.

• When canceling STANDALONE mode, surely pull out the AC cord from power outlet once to reset the Host

CPU.

3.3.4.1 HDD Y LEVEL

Signal (A1) • Ext. input Mode (B) • HDD(Live memory playback)

Equipment (C) • Oscilloscope Measuring point (D) • EVR mode (F1) •Jig code “95”

EVR address (F2) • b : 22

Specified value (G) • 1.00 ± 0.02 Vp-p Adjustment tool (H) • Jig RCU [PTU94023B]

(A2) •Color (colour) bar signal [PAL]

VIDEO OUT terminal (75Ø terminated)

(F3) • Jig code “21” (F4) • Jig code “18” or “19” (Channel +/-)

(1) Input the signal (A2) from the input point (A1). (2) Set the VCR to the mode (B). (3) Observe the VIDEO OUT waveform at the measuring point

(D).

(4) Set the VCR to the EVR mode by transmitting the code

(F1) from the Jig RCU.

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

from the Jig RCU.

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

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

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

code (F1) from the Jig RCU again. (When the EVR mode is released, the adjusted data is memorized.)

Y level

H. rate

Fig. 3-3-4-1a HDD Y level

3.3.4.2 HDD C LEVEL

Signal (A1) • Ext. input Mode (B) • HDD(Live memory playback)

Equipment (C) • Oscilloscope Measuring point (D) • EVR mode (F1) •Jig code “95”

EVR address (F2) • b : 23

Specified value (G) • 0.300 ± 0.02 Vp-p Adjustment tool (H) • Jig RCU [PTU94023B]

(A2) •Color (colour) bar signal [PAL]

VIDEO OUT terminal (75Ø terminated)

(F3) • Jig code “22” (F4) • Jig code “18” or “19” (Channel +/-)

(1) Input the signal (A2) from the input point (A1). (2) Set the VCR to the mode (B). (3) Observe the VIDEO OUT waveform at the measuring point

(D).

(4) Set the VCR to the EVR mode by transmitting the code

(F1) from the Jig RCU.

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

from the Jig RCU.

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

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

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

code (F1) from the Jig RCU again. (When the EVR mode is released, the adjusted data is memorized.)

burst level

H. rate

Fig. 3-3-4-2a HDD C level

3.3.4 Syscon circuit [HM-HDS4EX] Note:

•

When perform this adjustment, remove the Mechanism assembly .

3.3.4.1 Timer clock

Signal (A) • No signal Mode (B) • EE Equipment (C) • Frequency counter Measuring point (D1) • IC3001 pin 61

Short point (D2) • IC3001 pin 24 Adjustment part (F) • C3025 (TIMER CLOCK)

Specified value (G) •1024.008 ± 0.001 Hz

(D3) • C3026 + and –

(976.5549 ± 0.0010 µsec)

(1) Connect the frequency counter to the measuring point

(D1).

(2) Connect the short wire between the short point (D2) and

Vcc (5V).

(3) Short the leads of capacitor (D3) once in order to reset

the microprocessor of the SYSCON.

(4) Disconnect the short wire between the short point (D2)

and Vcc then connect it again.

(5) Adjust the Adjustment part (F) so that the output fre-

quency becomes the specified value (G).

3-6

VICTOR COMPANY OF JAPAN, LIMITED

12,3-chome,Moriya-cho,Kanagawa-ku,Yokohama,Kanagawa-prefecture,221-8528,JapanAV & MULTIMEDIA COMPANY.

Printed in Japan

0306 VP

JVC HM-HDS4EK, HM-HDS4EX Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

TABLE OF CONTENTS

Important Safety Precautions

Hard Disk Drive (HDD)

1.1 Before disassembling.

1.2 Removing the major parts

1.3 Emergency display function

1.4 Service position

1.5 Mechanism service mode

1.6 Maintenance and inspection

3.1 Before adjustment

3.2 Mechanism compatibility adjustment Notes:

3.3 Electrical adjustment Note: