JVC HRXV-28-SE Service manual

SERVICE MANUAL

DVD PLAYER & VIDEO CASSETTE RECORDER

YD06820055

HR-XV28SEF,HR-XV28SEK,
HR-XV28SER,HR-XV28SEU,
HR-XV28SEY,HR-XV28SEZ

(EK model)

(EU, EY, EZ models)

(EF, ER models)

(EF model)

HR-XV28SEF,HR-XV28SEK,HR-XV28SER,HR-XV28SEU,HR-XV28SEY,HR-XV28SEZ [D5PV0]

TABLE OF CONTENTS

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

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-37

COPYRIGHT © 2005 Victor Company of Japan, Limited

No.YD068

2005/5

SPECIFICATION

HR-XV28SEF HR-XV28SEK HR-XV28SER/SEU/SEY/SEZ

General

Power requirement AC 200V - 240V, 50 Hz

Power consumption 17 W

Dimensions (approx.) 430 × 78.5 × 265 mm (w/h/d)

Mass (approx.) 4.2 kg

Operating temperature 5°C to 35°C (41°F to 95°F)

Operating humidity 5 % to 90 %

Timer 24 hours display type

RF Modulator - UHF 22-68 (Adjustable)

System

Laser Semiconductor laser, wavelength 650 nm

Video Head system Double azimuth 6 heads, helical scanning.

Signal system PAL

Frequency response DVD (PCM 96 kHz): 8 Hz to 44 kHz, DVD (PCM 48 kHz): 8 Hz to 22 kHz, CD: 8 Hz to 20 kHz

Signal-to-noise ratio More than 100 dB (ANALOG OUT connectors only)

Harmonic distortion Less than 0.008%

Dynamic range More than 100 dB (DVD), More than 95 dB (CD)

Inputs (VCR)

Audio -6.0 dBm, more than 10 kΩ (SCART), -6.0 dBm, more than 47 kΩ (RCA)
Video 1.0 V (p-p), 75 Ω, unbalanced (SCART/RCA)

Outputs (DVD)

VIDEO OUT 1 Vp-p 75 Ω, sync negative

Audio output (digital audio) 0.5 V (p-p), 75 Ω, RCA jack × 1

Audio output (analog audio) 2.0 Vrms (1 kHz, 0 dB), 600 Ω, RCA jack (L, R) x 1/SCART (TO TV)

Outputs (VCR/DVD)

Audio -6.0 dBm, less than 1 kΩ (SCART)
Video 1.0 V (p-p), 75 Ω, unbalanced (SCART)

• Designs and specifications are subject to change without notice.

• Manufactured under license from Dolby Laboratories. "Dolby", "Pro Logic" and the double-D symbol are trademarks of Dolby Lab­oratories.

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

• SHOWVIEW is a trademark of Gemstar Development Corporation. The SHOWVIEW system is manufactured under license from
Gemstar Development Corporation.(EF/ER/EU/EY/EZ models)

• VIDEO Plus+ and PlusCode are registered trademarks of Gemstar Development Corporation. The VIDEO Plus+ system is man­ufactured under license from Gemstar Development Corporation.(EK model)

1-2 (No.YD068)

SECTION 1

r

PRECAUTION

1.1 SAFTY PRECAUTIONS

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

1.1.1 Precautions during Servicing

(1) Locations requiring special caution are denoted by labels

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

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

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

NOTE :

Parts in this category also include those specified to
comply with X-ray emission standards for products
using cathode ray tubes and those specified for
compliance with various regulations regarding spu­rious radiation emission.

(3) Fuse replacement caution notice.

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

(4) Use specified internal wiring. Note especially:

• Wires covered with PVC tubing

• Double insulated wires

• High voltage leads

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

Note especially:

• Insulation Tape

• PVC tubing

•Spacers

• Insulation sheets for transistors

•Barrier

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

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

Consequently, when servicing these products, replace the
cathode ray tubes and other parts with only the specified
parts. Under no circumstances attempt to modify these cir­cuits.Unauthorized modification can increase the high volt­age value and cause X-ray emission from the cathode ray
tube.

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

the power transformer in sets where the connections be­tween the power cord and power trans former primary lead
wires are performed using crimp type connectors, if replac­ing the connectors is unavoidable, in order to prevent safe­ty hazards, perform carefully and precisely according to the
following steps.

• Connector part number :E03830-001

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

• Replacement procedure

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

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

cut close to connector

Fig.1-1-3

b) Strip about 15 mm of the insulation from the ends

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

15 mm

Fig.1-1-4

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

sert the wires fully into the connector.

Metal sleeve

Fig.1-1-1

(7) Observe that wires do not contact heat producing parts

(heatsinks, oxide metal film resistors, fusible resistors, etc.)

(8) Check that replaced wires do not contact sharp edged or

pointed parts.

(9) When a power cord has been replaced, check that 10-15

kg of force in any direction will not loosen it.

Power cord

Fig.1-1-2
(10) Also check areas surrounding repaired locations.
(11) Products using cathode ray tubes (CRTs)In regard to such

products, the cathode ray tubes themselves, the high volt­age circuits, and related circuits are specified for compli­ance with recognized codes pertaining to X-ray emission.

Connector

Fig.1-1-5

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

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

1.2
5

2

.0

5.5

Crimping tool

Fig.1-1-6

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

Not easily pulled free

Wire insulation recessed

more than 4 mm

Crimped at approx. cente

of metal sleeve

Conductors extended

Fig.1-1-7

(No.YD068)1-3

1.1.2 Safety Check after Servicing

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

(1) Insulation resistance test

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

(2) Dielectric strength test

Confirm specified dielectric strength or greater between
power cord plug prongs and exposed accessible parts of
the set (RF terminals, antenna terminals, video and audio
input and output terminals, microphone jacks, earphone
jacks, etc.). See Fig.1-1-11 below.

(3) Clearance distance

When replacing primary circuit components, confirm spec­ified clearance distance (d), (d') between soldered termi­nals, and between terminals and surrounding metallic
parts. See Fig.1-1-11 below.

d

Chassis

d'

Power cord
primary wire

Fig.1-1-8

(4) Leakage current test

Confirm specified or lower leakage current between earth
ground/power cord plug prongs and externally exposed ac­cessible parts (RF terminals, antenna terminals, video and
audio input and output terminals, microphone jacks, ear­phone jacks, etc.).
Measuring Method : (Power ON)Insert load Z between
earth ground/power cord plug prongs and externally ex­posed accessible parts. Use an AC voltmeter to measure
across both terminals of load Z. See Fig.1-1-9 and follow­ing Fig.1-1-12.

ab

Externally
exposed
accessible part

Z

V

c

A

Fig.1-1-9

(5) Grounding (Class 1 model only)

Confirm specified or lower grounding impedance between
earth pin in AC inlet and externally exposed accessible
parts (Video in, Video out, Audio in, Audio out or Fixing
screw etc.).Measuring Method:
Connect milli ohm meter between earth pin in AC inlet and
exposed accessible parts. See Fig.1-1-10 and grounding
specifications.

AC inlet

Earth pin

Exposed accessible part

MIlli ohm meter

Grounding Specifications

Region

USA & Canada

Europe & Australia

Grounding Impedance (Z

Z 0.1 ohm

Z 0.5 ohm

)

Fig.1-1-10

AC Line Voltage

100 V

100 to 240 V

110 to 130 V

110 to 130 V

200 to 240 V

Region

Japan

USA & Canada

Europe & Australia

Insulation Resistance (R

R 1 M /500 V DC

1 M R 12 M /500 V DC

R 10 M /500 V DC

)

Dielectric Strength

AC 1 kV 1 minute

AC 1.5 kV 1 minute

AC 1 kV 1 minute
AC 3 kV 1 minute

AC 1.5 kV 1 minute

(

Class

(

Class

Clearance Distance (d), (d'

d, d' 3 mm

d, d' 4 mm

d, d' 3.2 mm

d 4 m m

)

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

)

Fig.1-1-11

AC Line Voltage

100 V

110 to 130 V

110 to 130 V

220 to 240 V

Region

Japan

USA & Canada

Europe & Australia

Load Z

1

0.15

1.5

2

50

Leakage Current (i)

i 1 mA rms

i 0.5 mA rms

i 0.7 mA peak
i 2 mA dc

i 0.7 mA peak
i 2 mA dc

a, b, c

Exposed accessible parts

Exposed accessible parts

Antenna earth terminals

Other terminals

Fig.1-1-12

NOTE :

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

)

)

)

1-4 (No.YD068)

1.2 Preventing static electricity

Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser
diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.

1.2.1 Grounding to prevent damage by static electricity

Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as DVD players.
Be careful to use proper grounding in the area where repairs are being performed.

(1) Ground the workbench

Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the
traverse unit (optical pickup) on it.

(2) Ground yourself

Use an anti-static wrist strap to release any static electricity built up in your body.

(3) Handling the optical pickup

• In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical
pickup are shorted. After replacement, return the shorted parts to their original condition.
(Refer to the text.)

• Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power source can easily
destroy the laser diode.

(No.YD068)1-5

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1 DIFFERENT TABLE OF FEATURE

The following table indicates main different points between models HR-XV28SEF, HR-XV28SEK, HR-XV28SER, HR-XV28SEU and
HR-XV28SEY/EZ.

MODEL NAME HR-XV28SEF HR-XV28SEK HR-XV28SER

SCART CABLE PROVIDED ← OPTIONAL
BROADCASTING SYSTEM PAL B/G, SECAM L PAL I, I/I, B/G, SECAM D/K, K1 ←

RF OUT CH/RF OUT
SYSTEM [INITIAL]

OSD LANGUAGES

REGIONAL CODE REGIONAL CODE : 2 ← REGIONAL CODE : 5

MODEL NAME HR-XV28SEU HR-XV28SEY/EZ

SCART CABLE OPTIONAL ←
BROADCASTING SYSTEM PAL I, I/I, B/G, SECAM D/K, K1 ←

RF OUT CH/RF OUT
SYSTEM [INITIAL]

OSD LANGUAGES

REGIONAL CODE REGIONAL CODE : 2 ←

Note:

Mark ← is same as left.

ENGLISH/GERMANY/FRENCH/

ITALIAN/SPANISH/DUTCH

ENGLISH/GERMANY/ITALIAN/

SPANISH/GREEK/PORTU-

NOT USED 22-68CH,[36CH]/I 22-68CH,[36CH]/K

ENGLISH/GERMANY/ITALIAN/

SPANISH/GREEK/PORTU-

GUESE

22-68CH,[36CH]/G ←

ENGLISH/POLISH/CZECH/

HUNGARIAN/SWEDISH/GER-

GUESE

MANY

ENGLISH/RUSSIAN

1-6 (No.YD068)

2.2 SERVICE INFORMATION FOR EEPROM IC SETTING(VCR)

EEPROM option code No. setting EEPROM option code No. setting procedure

NAME HEX BINARY
OPT0 00 00000000

OPT1 00 00000000
OPT2 00 00000000
OPT3 00 00000000
OPT4 00 00000000
OPT5 00 00000000

12/26 - 00 V00 -COM Ver.
ID : LG
VERSION : 05 ROM
DATE : 02.17.05 Correction Ver.

MODEL NAME HEX BINARY
HR-XV28SEU OPT0 00 00000000
OPT1 54 00000000
OPT2 60 00000000
OPT3 47 00000000
OPT4 03 00000000
OPT5 0B 00000000
HR-XV28SEK OPT0 00 00000000
OPT1 54 00000000
OPT2 21 00000000
OPT3 87 00000000
OPT4 0D 00000000
OPT5 0B 00000000
HR-XV28SEZ OPT0 00 00000000
OPT1 54 00000000
OPT2 63 00000000
OPT3 47 00000000
OPT4 0D 00000000
OPT5 0B 00000000
HR-XV28SEY OPT0 00 00000000
OPT1 54 00000000
OPT2 63 00000000
OPT3 47 00000000
OPT4 0B 00000000
OPT5 0B 00000000
HR-XV28SER OPT0 09 00000000
OPT1 54 00000000
OPT2 A3 00000000
OPT3 47 00000000
OPT4 0D 00000000
OPT5 0B 00000000
HR-XV28SEF OPT0 00 00000000
OPT1 5C 00000000
OPT2 E8 00000000
OPT3 47 00000000
OPT4 01 00000000
OPT5 0B 00000000
WR : OK I : EXIT MOVE :
EDIT :

1. DETECT NEW EEPROM (OPTION EDIT
SCREEN)

- Eeprom EDIT screen automatically appears if
replacing Eeprom.

- Setup option data using the cursor Up/Down key
of a remote control.
(Setup upon BOM depending on OPT0~OPT5
model)
Since an initial remote control is set to LG for LG
model, appropriately set optiona data using the
cursor Up/Down key.

2. EEPROM WRITED AND EEPROM INITIAL

- Writes data on EEPROM by using REMOCON
"OK" + FRONT PLAY KEY FOR MORE THAN 5
SECONDS.

3. PG ADJUST

1) Payback the SP standard tape

2) Press the "OK" key on the Remote controller
and the "PLAY" key on the Front Panel the
same time, then it goes in to Tracking initial
mode.

3) Repeat the above step(No.2), then it finishes
the PG adjusting automatically.

4) Stop the playback, then it goes out to PG
adjusting mode after mony the PG data.

4. BUYER SELECTION

- Font ejection key + open/close key for more than
5 seconds.

- Option code is displayed in TV

- First byte of OPTO is changed whenever front
eject key + open/close key.

- JVC remote conroller No.0.

(No.YD068)1-7

2.3 SERVICE INFORMATION FOR EEPROM (DVD)

POWER ON

DVD LOGO Status (NO Disk status)

DETECT NEW EEPROM
(OPTION EDIT SCREEN)

Remote control
Pause key 1 4 7 2 in order.

Press number 0~9, Press charater
A~F (1~6 for a while)

Use arrow key ( ) to move
to approprite position and make
changes

Press pause key once

Change will be applied when power

OFF ON.

MODEL
NAME HEX HEX HEX HEX HEX HEX

OPT 1 44 47 50 53 52 42
OPT 2 45 42 4C 45 55 45
OPT 3 00 00 00 00 00 00
OPT 4 D3 D3 D3 D3 D3 D3
OPT 5 12 12 12 12 12 12
OPT 6 05 05 05 05 05 05
OPT 7 30 30 30 30 30 30
OPT 8 00 00 00 00 00 00
OPT 9 00 00 00 00 00 00
OPT A 00 00 00 00 00 00
OPT B 80 80 80 80 80 80
OPT C 00 00 00 00 0A 00
OPT D 00 00 00 00 00 00
OPT E 00 00 00 00 00 00
OPT F 00 00 00 00 00 00
OPT G 00 00 00 00 00 00

HR-XV28SEU HR-XV28SEK HR-XV28SEZ HR-XV28SEY HR-XV28SER HR-XV28SEF

* OPTION

NTSC model does not have VCR option and use DVD option B~F as VCR option. (only DVD exist)
PAL model has another separate VCR option. (Both VCR and DVD exist)

1-8 (No.YD068)

SECTION 3

DISASSEMBLY

This service manual does not describe DISASSEMBLY.

(No.YD068)1-9

SECTION 4

ADJUSTMENT

4.1 POSITION DRAWING OF DECK MECHANISM PARTS (VCR)

Top View

9

2

6

11

1

33

14

15

7

35

4

3

5

10

8

12

18

16

17
19

13

15

Bottom View

20

21

24

21

24

23

22

30

NOTE : Assembly order is a reverse of
disassembly order.

26

32

31

31

32

25

34
28

27

29

Order Of Dis-

assembled
Parts firstly
Disassembled

1

Drum Assembly

2

Plate Top
2
2,3
2,3,4
2,3,4,5

2,3
2,3
2,3,13,14

17
17

17,18

21,22

21
21,22,23,
24,25,26
21,22,23,
24,25,26,27
21,22,23,
24,25,26,27
21,22,23,
24,25,26,27
25

2,3,14,
25,31
25,31
2,3,14

3

Holder Assembly CST

4

Gear Assembly Rack F/L

5

Opener Door

6

Arm Assembly F/L

7

Lever Assembly S/W

8

Motor Assembly L/D

9

Gear Wheel

10

Arm Assembly Cleaner

11

Head F/E

12

Base Assembly A/C Head

13

Brake Assembly T

14

Arm Assembly Tension

15

Reel S / Reel T

16

Base Assembly P4

17

Opener Lid

18

Arm Assembly Pinch

19

Arm T/up

20

Supporter, capstan

21

Belt Capstan/Motor Capstan

22

Lever F/R

23

Clutch Assembly D37

24

Gear Drive/Gear Cam

25

Gear Sector

26

Brake Assembly Capstan

27

Plate Slider

28

Lever Tension

29

Lever Spring

30

Lever Brake

Gear Assembly P2/

31

Gear Assembly P3

Base Assembly P2

32

/Base Assembly P3

33

Base Loading

34

Base Tension

35

Arm Assembly Idler Jog

T:Top, B:Bottom

Part

Ref.

Fixing Type

Draw-

ings
3 screws
2 hooks
6 chasses
1 hook
Chassis Hole
Chassis Hole
Chassis Hole,
1 hook
1 screw
2 hooks
Chassis Embossing
Chassis Embossing
1 screw
1 hook
1 hook
Shaft
Chassis Embossing
Chassis Embossing
Shaft
1 hook
Chassis Hole
3 screws
Ta b
Washer
Washer/Hook
Hook
Chassis Hole

Chassis Guide

1 Hook

1 Hook

1 Hook

Bass

6 Chasses

3 Hooks
Chassis Embossing
Locking Tab

A-1

A-2

A-2

A-2

A-2

A-2

A-2

A-3

A-3

A-3

A-3

A-3

A-4

A-4

A-4

A-5

A-5

A-5

A-5

A-6

A-6

A-6

A-6

A-7

A-7

A-7

A-7

A-7

A-7

A-7

A-8

A-8

A-8

A-9

A-9

Posi

tion

T
T
T
T
T
T

T

T
T
T
T
T
T
T
T
T
T
T

T
B
B
B
B
B
B
B

B

B

B

B

B

B

B
B
B

(1) For assembly, check the assembly mode is accurate.
(2) Parts firstly disassembled indicate parts firstly disassembled
in disassembly of related parts.

1-10 (No.YD068)

4.2 DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM (VCR)

Drum Assembly

Cable Flat

1. Disassembly of Drum Assembly
(Figure A-1)

1) Separate cable flat from the Drum FPC and the Capstan
Motor.

2) Release 3 screws (S1) on the bottom side of the chassis,
and separate the drum assembly.

3) Release the hooks (H1, H2) and separate both the holder
FPC and the Cap FPC (disassemble if necessary).

(S1)

H2

Fig. A-1

Cautions in assembly of FPC

Holder FPC

(S1)

(S1)

Cap, FPC

H1

Holder FPC

Cap FPC

Drum FPC

Assembly shape seen in the reverse direction

(No.YD068)1-11

Plate Top

(Fig. A-2-1)

(H4)

(B')

Arm Assembly F/L

(Fig. A-2-5)

Lever Assembly S/W

(Fig. A-2-6)

(B)

(C)

Holder Assembly CST

(Fig. A-2-2)

(E)

(E)

1-12 (No.YD068)

Fig. A-2

Gear Assembly Rack F/L

(Fig. A-2-3)

Opener Door

(Fig. A-2-4)

(A)

(H3)

(B)

2. Disassembly of Plate Top (Fig. A-2-1)

1) Separate the right part while leaning back the (B) part of
the plate top toward the arrow direction.

2) Separate the left part while leaning back the (B f) part of
the plate top toward the arrow direction.
(Tool used: Tool such as (-) driver, auger, etc with pointed
or flat end)

CAUTIONS

Assemble while pressing the (C), (C') part after correspond­ing them as in drawing.

(C')

(C)

(B')

(B)

3. Holder Assembly CST (Fig. A-2-2)

1) Firstly separate the left part from the groove on the (D)
part of chassis while moving the holder assembly CST
toward the arrow direction.

Holder Assembly CST

(D)

Chassis

4. Disassembly of Gear Assembly
Rack F/L (Fig. A-2-3)

1) Separate the hook (H3) while leaning ahead the hook (3)
after moving the gear assembly rack F/L toward the arrow
(A) direction.

2) Separate the gear assembly rack F/L toward the arrow (B)
direction.

CAUTIONS

For the assembly, correspond the gear part of gear assembly
rack F/L to the gear drive.

Gear Rack F/L

Gear Drive

5. Opener Door (Fig. A-2-4)

1) Separate the opener door ahead from the guide hole of
chassis while turning it clockwise.

6. Arm Assembly F/L (Fig. A-2-5)

1) Firstly separate the left part of the arm assembly F/L from
the groove of chassis while pushing the arm assembly F/L
toward the arrow direction.

2) Separate the right part from the groove of chassis.).

2) Separate the right part from each groove of chassis

CAUTIONS

Assemble by inserting the left part after firstly inserting the
(E) part of the holder assembly CST into the groove on the
(E') part of chassis.

7. Lever Assembly S/W (Fig. A-2-6)

1) Separate the lever assembly S/W while pushing it toward
the arrow direction after removing the hook (4) on the left
side of chassis.

Chassis

(H4)

(No.YD068)1-13

Base Assembly A/C Head

(Fig. A-3-5)

(A)

Arm Assembly Cleaner

(Fig. A-3-3)

(A)

(S5)

(H5)

Gear Wheel

(Fig. A-3-2)

Motor Assembly L/D

(Fig. A-3-1)

Head F/E

(Fig. A-3-4)

(C1)

(S4)

Fig. A-3

8. Motor Assembly L/D (Fig. A-3-1)

1) Take the connector (C1) connected to the Capstan motor
PCB out.

2) Remove a screw (S4) of the chassis (S4) and step back­ ward, and disassemble it while holding it up.

9. Gear Wheel (Fig. A-3-2)

1) Release the hook (H5) of the gear wheel and disassemble
it upward.

1-14 (No.YD068)

10. Arm Assembly Cleaner (Fig. A-3-3)

1) Separate the (A) part of Fig. A-3-1 from the embossing of
chassis, and hold it up while turning it anti-clockwise.

11. Head F/E (Fig. A-3-4)

1) Separate the (A) part of the head F/E from the emboss­ing of chassis, and hold it up while turning it anti-clockwise.

12. Base Assembly A/C Head (Fig. A-3-5)

1) Release a screw (S5) and disassemble while holding it up.

Arm Assembly Tension

(Fig. A-4-2)

Spring Tension

(H7)

Reel T

(Fig. A-4-3)

Reel S

(Fig. A-4-3)

(H8)

Spring Tension

Fig. A-4

Brake Assembly T

(Fig. A-4-1)

(H6)

13. Brake Assembly T (Fig. A-4-1)

1) Release the spring tension from the lever spring hook
(H6).

2) Disassemble the brake assembly T while holding it
upward.

14. Arm Assembly Tension (Fig. A-4-2)

1) Release the spring tension the hook (H7) from the arm
assembly tension.

2) After releasing the hook (H8) of the base tension, separate
it while holding it up.

CAUTIONS

Spring used for both brake assembly T and arm assembly
tension is used (2EA used).

15. Reel S/Reel T (Fig. A-4-3)

1) Disassemble the reel S/ reel T while holding it up (compa­ rison between Reel S and Reel T)

Reel S Reel T

(No.YD068)1-15

(Fig. A-5-2)

(B)

Opener Lid

Arm Assembly Pinch

(Fig. A-5-3)

(C)

Base Assembly P4

(Fig. A-5-1)

(A)

(C)

(H9)

Arm T/up

(Fig. A-5-4)

Chassis

16. Base Assembly P4 (Fig. A-5-1)

1) Release the (A) part of the base assembly P4 from the
embossing of chassis.

2) Hold the base assembly P4 up while turning it anti-clock­ wise.

17. Opener Lid (Fig. A-5-2)

1) Release the (B) part of the opener lid from the embossing
of chassis.

2) Disassemble the opener lid upward while turning it anticlo­ ckwise.

1-16 (No.YD068)

Fig. A-5

18. Arm Assembly Pinch (Fig. A-5-3)

1) Hold the arm assembly pinch up.

19. Arm T/up (Fig. A-5-4)

1) Turn the arm T/up to release the anchor jaw (H9) part of
chassis and then hold it upward.

CAUTIONS

For the assembly, check the (C) part of the arm assembly
pinch is assembled as in drawing.

- REVERSE THE MECHANISM.

Suppoter Capstan

(Fig. A-6-1)

Motor Capstan

(L1)

Lever F/R

(Fig. A-6-4)

Belt Capstan

(Fig. A-6-2)

(Fig. A-6-3)

Washer(W1)

Clutch Assembly D37

(Fig. A-6-5)

(L1)

(S6)

Fig. A-6

20. Supporter, Capstan (Fig. A-6-1)

1) Turn the supporter and Capstan by 90 deg. clockwise
with a driver for disassembly.

21. Belt Capstan (Fig. A-6-2) /
Motor Capstan (Fig. A-6-3)

1) Separate the belt Capstan.

2) Undo 3 screws (S6) on the bottom side of chassis and dis­ assemble it upward.

Chassis

22. Lever F/R (Fig. A-6-4)

1) Release the locking tab (L1) and then disassemble it
upward.

23. Clutch Assembly D37 (Fig. A-6-5)

1) Remove the washer (W1) and then disassemble it
upward.

(No.YD068)1-17

(H10)

(Fig. A-7-2)

(W2)

Gear Cam

Washer (W2)

(H11)

Gear Sector

(Fig. A-7-3)

Gear Cam Hole(B)

Gear Cam Hole(C)

Gear Drive Hole(A)

Gear Drive

(Fig. A-7-1)

Lever Brack

(Fig. A-7-8)

(L2)

Chassis

Brake Assembly Capstan

(Fig. A-7-4)

(Fig. A-7-5)

(Fig. A-7-6)

(B)

(Fig. A-7-7)

3 6

Plate Slider

Lever Tension

Lever spring

Base Loading

Fig. A-7

24. Gear Drive (Fig. A-7-1)/Gear Cam (Fig. A-7-2)

1) Remove the washer (W2) and then disassemble the
gear drive.

2) Release the hook (H10) of the gear cam and then disas­ semble it upward.

CAUTIONS

For the assembly, adjust both the gear driver hole (A) and
the gear cam hole (B) straightly and then correspond the
gear cam hole (C) to the chassis hole.

25. Gear Sector (Fig. A-7-3)

1) Release the hook (H11) of the gear sector and then hold
the gear sector upward.

26. Brake Assembly Capstan (Fig. A-7-4)

1) Release the locking tab (L2) on the bottom side of the
plate slider and then disassemble it upward.

27. Plate Slider (Fig. A-7-5)

1) Disassemble the plate slider while holding it up.

28. Lever Tension (Fig. A-7-6)

1) Release the lever tension from the guide (A) of chassis
while turning it anti-clockwise.

2) Disassemble the lever tension while holding it up.

29. Lever Spring (Fig. A-7-7)

1) Release the (B) part of the lever spring from the guide
(A) of chassis while turning it anti-clockwise.

2) Disassemble the lever tension while holding it up.

30. Lever Brake (Fig. A-7-8)

1) Disassemble the lever brake while holding it up.

1-18 (No.YD068)

Gear assembly P2 Hole

Gear assembly P3 Hole

Lever Tension Boss

Gear sector (A)

Plate slider Hole(B)

(H12)

(H14)

Gear Assembly P3

(Fig. A-8-2)

Gear Assembly P2

(Fig. A-8-1)

(H13)

Base Loading

(Fig. A-8-5)

Chassis

Base Assembly P3

(Fig. A-8-4)

31. Gear Assembly P2 (Fig. A-8-1)/
Gear Assembly P3 (Fig. A-8-2)

1) Hold the gear assembly P2 upward.

2) Hold the gear assembly P3 upward.

CAUTIONS

For the assembly, check the holes of both the gear assemb­ly P2 and the P3 are adjusted straightly, and then correspo­nd the gear section groove (A) to the plate slider hole (B).

(B)

(A)

Base Assembly P2

(Fig. A-8-3)

Fig. A-8

32. Base Assembly P2 (Fig. A-8-3)/
Base Assembly P3 (Fig. A-8-4)

1) Disassemble the base assembly P2 downward while mov­ ing it toward the arrow (A) direction along with the guide
hole of chassis.

2) Disassemble the base assembly P2 downward while mov­ ing it toward the arrow (B) direction along with the guide
hole of chassis.

33. Base Loading (Fig. A-8-5)

1) Release 3 hooks (H12, 13, 14) of the base loading, and
then disassemble them upward.

- REVERSE THE MECHANISM.

(No.YD068)1-19

Base Tension

(Fig. A-9-1)

(A)

Arm Assembly Idler Jog

(Fig. A-9-2)

(B) (C)

(D)

34. Base Tension (Fig. A-9-1)

1) Release the (A) part of the base tension from the
embossing of chassis.

2) Hold the base tension upward while turning it anti-clock­ wise.

Chassis

Fig. A-9

35. Arm assembly Idler Jog (Fig. A-9-2)

1) Push both (B), (C) parts in Fig. A-9-2 toward the arrow
direction.

2) Disassemble the arm assembly idler upward.

CAUTIONS

Take care to ensure that the (D) part in the drawing is not
hung to chassis in disassembly.

1-20 (No.YD068)

4.3 DECK MECHANISM ADJUSTMENT (VCR)

4.3.1 Tools and Fixfures for Service

1. Cassette Torque Meter

1. PUJ42881

1.

300

S

-

T

2

50

H

V

-

20

0

K

R

15

0

S

SRK

VIDEO

CASSETTE

H

V

T

-

-

K

T

R

0

TORQUE

S

50

0

METER

VHT-303

50

15

0

2

00

25

0

300

5. Post Height Adjusting Driver
(Roller driver)
PTU94002

2. Alignment Tape
NTSC: MHP
PAL: MHPE

3. Torque Gauge

3. PUJ48075-2

(No.YD068)1-21

4.3.2 Mechanism Assembly Mode Check

Purpose of adjustment : To make tools normally operate by positioning tools accurately.

Fixtures and tools used VCR (VCP) status Checking Position

Blank Tape (empty tape)

Eject Mode
(with cassette withdrawn)

1) Turn the VCR on and take the tape out by pressing the
eject button.

2) Separate both top cover and plate top, and check both
the hole (A) of gear cam and the hole (A') of chassis co­ rrespond (Fig. C-2).

3) If it is done as in the paragraph 2): Turn the gear cam as
in No.2) after mantling the motor assembly L/D.

CHECK DIAGRAM

Mechanism and Mode Switch

4) Undo the screw fixing the deck and the main frame, and
separate the deck assembly. Check both the hole (A) of
gear cam and the hole (A') of chassis correspond (Fig.
C-1).

5) Check the mode S/W on the main P.C. board locates at
a proper position as in (B) of the Fig. (C-1).

6) Connect the deck to the main P.C. board and perform all
types of test.

Gear Cam

(C)

Gear Drive

(B)

Mode S/W

BOTTOM VIEW

TOP VIEW

Fig. C-1

Fig. C-2

Correspondence of the gear cam hole (O)

and the gear drive hole (O)

Motor Assembly L/D

Gear Cam

(A')

(A)

Chassis Hole

Gear Cam Hole

1-22 (No.YD068)

4.3.3 Previous Preparation for Deck Adjustment

(Preparation to load the VCR (VCP) with cassette tape not inserted)
(1) Take the power cord from the consent.
(2) Separate the top cover and the plate assembly top.
(3) Insert the power cord into again.
(4) Turn the VCR (VCP) on and load the cassette while push-

ing the lever stopper of the holder assembly CST back-

If doing so, proceeding to the stop mode is done. In this status,
input signals of all modes can be received. However, operation
of the Rewind and the Review is impossible since the take-up
reel remains at stop status and so cannot detect the reel pulse

(however, possible for several seconds).
ward. In this case, clog both holes on the housing rail part
of chassis to prevent detection of the end sensor.

4.3.4 Torque Measuring

Purpose of Measuring : To measure and check the reel torque on the take-up part and the
supply part that performs basic operation of the VCR (VCP) for
smoothly forwarding the tape.
Measure and check followings when the tape is not smoothly
wound or the tape velocity is abnormally proceeded:

VCR (VCP) status Measuring methodFixtures and tools used

Torque Gauge
(600 g.cm ATG)
Torque Gauge Adaptor
Cassette Torque Meter

Play (FF) or Review
(REW) Mode

Try to operate the VCR (VCP) per mode with the
tape not inserted (See 4.3.3 Prior Preparation for
Deck Adjustment).
Measure after adhering and fixing the torque
gauge adaptor to the torque gauge (Fig. C-3-1)
Read scale of the supply or take-up part of the
cassette torque meter (Fig. C-3-2).

Item

Fast forward Torque

Rewind Torque

Play Take-Up Torque

Review Torque

Fast Forward

Rewind

Play

Review

Mode Instruments Reel Measured Measuring Value

Torque Gauge

Torque Gauge

Cassette Torque Meter

Cassette Torque Meter

Take-Up Reel

Supply Reel

Take-Up Reel

Supply Reel

NOTE

Adhere the torque gauge adaptor to the torque gauge for measuring the value.

Cassette Torque MeterTorque Gauge (600g.cm ATG)

Torque Gauge

Torque Gauge
Adaptor

More than 400g cm

More than 400g cm

40~100g cm

40~210g cm

300

S

-

T

250

H

V

-

200

K

R

150

S

SRK

VIDEO

CASSETTE

H

V

T

-

-

K

T

R

TORQUE

50

0

METER

VHT-303

0

S

50

150

200

250

300

Reel Table

Fig. C-3-2Fig. C-3-1

(No.YD068)1-23

4.3.5 Guide Roller Height Adjustment

Purpose of adjustment : To ensure that the bottom surface of the tape can travel along with
the tape lead line of the lower drum by constantly and adjusting
and maintaining the height of the tape.

4.3.5.1 Prior Adjustment

Fixtures and tools used VCR (VCP) status Adjustment position

Post Height Adjusting
Driver

Play or Review Mode

Adjustment Procedure

1) Travel the tape and check the bottom surface of the
tape travels along with the guide line of the lower drum.

2) If the tape travels toward the lower part of guide line on
the lower drum, turn the guide roller height adjusting
screw to the left

3) If it travels to the upper part, turn it to the right.

4) Adjust the height of the guide roller to ensure that the
tape is guided on the guide line of the lower drum at the
inlet/outlet of the drum. (Fig. C-4-1)

4.3.5.2 Fine Adjustment

Fixtures and tools used

Oscilloscope
Alignment tape
Post height adjusting
driver

Measuring tools and
connection position

CH-1: PB RF Envelope
CH-2: NTSC : SW 30Hz
PAL : SW 25Hz
Head switching output
point
RF Envelope output
point

The guide roller height adjusting screw on the
supply guide roller and the take-up guide roller

ADJUSTMENT DIAGRAM

Fig. C-4-1

GUIDE ROLLER
HEIGHT
ADJUSTMENT SCREW

VCR (VCP) status Adjustment position

Play the standard test
tape.

Guide roller height
adjusting screw

Waveform

P2 POST ADJUSTMENT

1) Play the Alignment tape after connecting the probe of
oscilloscope to the RF envelope output point and the
head switching output point.

2) Tracking control (playback) : Locate it at the center
(Set the RF output to the maximum value via the tracking
control when such adjustment is completed after the
drum assembly is replaced.)

3) Height adjusting screw: Flatten the RF waveform.
(Fig. C-4-2)

4) Move the tracking control (playback) to the right/left.
(Fig. C-4-3)

5) Check the start and the end of the RF output reduction
width are constant.

CAUTIONS

There must exist no crumpling and folding of the tape due
to excess adjustment or insufficient adjustment.

P3 POST ADJUSTMENT

Fig. C-4-2

When the tracking control
locates at the center.

Fig. C-4-2

Connection Diagram

RF ENVELOPE OUTPUT POINT

HEAD RF SWITCHING OUTPUT POINT

Flatten the waveform by
lightly turning the guide
roller height adjustment
screw.

When turning the tracking
control to both sides.

OSCILLOSCOPE

CH-1 CH-2

1-24 (No.YD068)

4.3.6 Audio/Control (A/C) Head Adjustment

Purpose of adjustment : To ensure that audio and control signals can be recorded and
played according to the contract tract by constantly maintaining
distance between tape and head, and tape tension between the P3
post and the P4 post.

4.3.6.1 Prior Adjustment (performed only when no audio output appears in play of the standard test tape)

Fixtures and tools used VCR (VCP) status Adjustment position

Blank Tape
Driver (+) Type 5mm

Play the blank tape

Adjustment Procedure/Adjustment Diagrams

1) Basically use the A/C head assembly adjusted as in
SPEC.

2) Check there is crumpling and folding of the tape around
the A/C head. If it is, Turn and adjust the tilt adjusting
screw to ensure that the tape corresponds to the bottom
guide of the P4, and recheck the tape path after proceed­ ing play for 4-5 seconds.

8.3

A/C Head Base

Tilt adjusting screw (C)
Height adjusting screw (B)
Azimuth adjusting screw (A)

3) Where the tape bottom is not equal to Fig. C-5-3, Adjust
the height by using the height adjusting screw (B) and
then readjust it by using the tilt adjusting screw (C).

CAUTIONS

Always check the height of the A/C head since most ideal
height of A/C head can be obtained when the bottom part
of the tape is away 0.2 ~ 0.25mm from the bottom part of
the A/C head.

A/C Head

P4

Tape

0.2~0.25mm

Tape

Azimuth
Adjustment
Screw(A)

Fig. C-5-1

X-Value Adjustment
Hole

Fixed Screw

A/C Head Assembly

Fig. C-5-2

Fig. C-5-3

Tilt Adjustment

Screw(C)

Height Adjustment

Screw(B)

(No.YD068)1-25

4.3.6.2 Tape Path Check between Pinch Roller and Take up Guide (Check in the Rev Mode)

1) Check the tape pass status between the pinch roller and the
take-up guide.(Check there is crumpling of the tape pass and
folding of the take-up guide.)

(1) When holding of the take-up guide bottom occurs

Turn the tilt adjusting screw (C) clockwise and travel it sta­bly to ensure there is no crumbling or folding of the tape.

(2) When holding of the take-up guide top occurs

Turn the tilt adjusting screw (C) anti-clockwise and travel it
stably to ensure there is no crumbling or folding of the tape.

4.3.6.3 Fine Adjustment (Azimuth Adjustment)

2) Check there is folding of the tape at the bottom or top of the
take-up guide in cutting-off the REV mode

CAUTIONS

If the RF waveform is changed after adjusting the A/C head,
perform fine adjustment to ensure the RF waveform is flat­ened.

Fixtures and tools used Connection position VCR (VCP) status Adjustment position

Oscilloscope
Standard test tape
(only for SP)
Driver (+) Type 4mm

Adjustment Procedure

1) Connect the probe of Oscilloscope to the audio output
jack.

2) Ensure that Audio 1KHz, 7KHz output is flattened at the
maximization point by adjusting the Azimuth adjusting
screw (A).

4.3.7 X-Value Adjustment

Audio Output Jack Play the Alignment tape

1KHz, 7KHz.

1KHz

A: Maximum

Fig. C-5-4

Azimuth Adjusting
Screw (A)
Height Adjusting Screw
(B)

B: Minimum

Purpose of adjustment : To maintain compatibility with other VCR (VCP).

Fixtures and tools used Connection position VCR (VCP) status Adjustment position

Oscilloscope
Standard test tape
(only for SP)
Driver (+) Type 4mm

CH-1: PB RF Envelope
CH-2: NTSC ; SW 30Hz
PAL:SW 25Hz
Head switching output
point
RF Envelope output
point

Play the Alignment tape

Left

Grove of Base A/C

Right

7KHz

Adjustment Procedure

1) After releasing the auto tracking, lightly turn the fixing
screw. Turn the (+) type driver on the X-dis-tance adju­ sting hole to the right or left. Adjust the RF envelope
level to the maximum point and then fix the fixing screws.

2) For the 31 m head, adjust it with the SP tape recorded
in the width of 31 m since the head travels on the tape
track only for SP with the width of 58 m.

1-26 (No.YD068)

Connection Diagram

X-value Adjusting Hole

Fixing Screw

Azimuth

Adjustment

Screw(A)

Fig. C-6

RF ENVELOPE OUTPUT POINT

HEAD RF SWITCHING OUTPUT POINT

Tilt Adjusting Screw (C)

Height Adjusting
Screw (B)

OSCILLOSCOPE

CH-2CH-1

4.3.8 Adjustment after Drum Assembly (Video Heads)

Purpose of adjustment : To adjust and stabilize the height change, X-distance change, etc
depending on the guide roller after assembling the drum.

Fixtures and tools used Connection position VCR (VCP) status Adjustment position

Oscilloscope
Alignment tape
(only for SP)
Post Height Adjusting
Driver
Driver (+) Type 5mm

CH-1: PB RF Envelope
CH-2: NTSC : SW 30Hz
PAL:SW 25Hz
Head switching output
point
RF Envelope output
point

Checking/Adjustment Procedure

1) Play the blank tape and check whether the guide roller
crumbles or wrinkles the tape and adjust it if necessary.

2) Check that the RF envelope output waveform is flat, and
adjust the height of the guide roller while playing the
alignment tape.

3) Adjust the switching point.

4) Check the RF envelope output is the maximum when
the tracking control locates at the center. If not maximum,
set up to ensure that RF envelope output becomes the
maximum by turning the (+) type driver on the base A/C
groove.

4.3.9 Check of Traveling Device after Deck Assembly

4.3.9.1 Audio, RF Normalization Time (Locking Time) Check in Play after CUE or REV

Play the blank tape.
Play the Alignment tape.

Connection Diagram

RF ENVELOPE OUTPUT POINT

HEAD RF SWITCHING OUTPUT POINT

Waveform

V1/V MAX = 0.7
V1/V MAX = 0.8
RF ENVELOPE OUTPUT

Fine adjustment of
guide roller
Switching Point
Tracking Preset
X-value

OSCILLOSCOPE

CH-2CH-1

V2V1V1

Fixtures and tools used Measuring standard Connection position VCR (VCP) status

Oscilloscope
Alignment tape
(Colour bar)
Stop Watch

RF Locking Time: Within
5 seconds
Audio Locking Time :
Within 10 seconds

CH-1: PB RF Envelope
CH-2: Audio output
RF Envelope output
point

Play the Alignment
tape (Colour bar)

Audio output jack

Checking Procedure

1) Check that locking time of the RF and Audio waveform is
fallen within the measuring standard in conversion of the
play mode from the CUE or the REV mode.

4.3.9.2 Check of Tape Curl and Jam Status

2) Readjust the paragraph 4.3.6 and 4.3.7 if it deviates
from the standard.

Fixtures and tools used Fixtures and tools used Fixtures and tools used

E-240 Tape
E-160 Tape

Checking Procedure

1) Check there is no abnormality of every traveling post
status.

2) There must be no abnormal operation of the counter in

There must be no jam or curl at the
first, middle and end position of tape.

occurrence of folding of the bottom tape. There must be
not abnormality of audio signal in damage of the top tape.

3) If there is abnormality, readjust the adjustment paragraph

4.3.5 and 4.3.6.

Travel the tape at the position
of its first and end.

(No.YD068)1-27

4.4 PROTECTION, MAINTENANCE AND CHECK OF VIDEO FUNCTION (VCR)

4.4.1 Checking Points prior to Repair

Following abnormal phenomena may be repaired by removal of
foreign materials and oil supply. Check oiling is required at the
checking set or cleaning status is complete.

Determine that necessity of checking and repair the set exists af­ter checking the using period of the set together with the user. In
this case, followings must be checked:

Phenomena

Color beat Pollution of Full-Erase Head o

S/N, Color Faded Pollution of Video Head o

Horizontal, Vertical Jitte o

Poor Sound, Low Sound o

No tape wound or tape
wound loosely.
FF or REW impossible,
or slow turning

Tape loosely wound in
REV or Unloading

Checking Points and
Cause

Pollution of Video Head or
Tape Transport System

Pollution of Audio/Control
Head

Pollution of Pinch Roller or
Belt Capstan Belt

Deterioration of Clutch
Assembly D37 Torque

Pollution of Drum and
Traveling Device

Replace-

ment

o

o

Fig. C-9-3

CAUTIONS

If operation of the position with (O) mark is abnormal even
after removing cause, replace it with substitute product since
it shows damage or wearing.

F/E Head

Video Head

Fig. C-9-1 TOP VIEW

A/C Head

Pinch Roller

Belt Capston

Clutch

Assembly A37

Fig. C-9-2 BOTTOM VIEW

* No. (1) ~ (12) shows sequence that the tape moves from the supply reel to the take-up reel.)

(3) F/E Head

(5) Drum Assembly

(Video Head)

(4) Base Assembly P2

(2) Tension Post

(1) Supply Reel

Fig. C-9-3 Tape Transport System

1-28 (No.YD068)

(6) Base Assembly
P3

(7) A/C Head

(8) P4 Post

(10) Pinch Roller

(11) Take-up Guide
Post

(9) Capstan Shaft

(12) Take-up Reel

4.4.2 Essential Check and Repair

Recording density of the video is far higher than the audio.
Therefore video parts are very precise so as to allow only error
of 1/1000mm or so in order to maintain compatibility with other
videos.
If one of these parts is polluted or old, same phenomena will
appear as they are damaged.
To maintain clear screen, regular check, replacement of old and
damaged parts and oil supply, etc are essential.

4.4.3 Regular Check and Repair

Check and repair schedule is not constant since they vary de­pending on method that the consumer uses video and environ­ment where the video is installed at.
However, for the video used by common household, good screen
will be maintained if regular check and repair per 1,000 hour is
performed. The following chart shows relationship between us­ing time and checking time:

Time

Requiring

Checking

Average
hours used
per day

One hour

Two hours

Three hours

About
1 year

About

18 months

About

3 years

4.4.4 Tools for Check and Repair

(1) Grease: Floil G-3114 (KANTO) or equivalent grease

(Green)
(2) Grease: Kanto G-754, PL-433 (Yellow)
(3) Alcohol (Isopropyl Alcohol)
(4) Cleaning Patch (cloth)

4.4.5 Maintenance Process

4.4.5.1 Removal of Foreign Material

(1) Removal of foreign material from video head (Fig. C-9-4)

Firstly try to use a cleaning tape.

Use a cleaning patch if foreign materials are not removed

with the cleaning tape due to severe dirty of the head.

Soak the cleaning patch in alcohol and put it to the head tip.

Smoothly turn the drum (turning cylinder) to the right or left

(In this case, the cleaning patch must not be moved verti-

cally).

After completely drying the head, test the traveling status

of the tape.

If alcohol (Isopropyl Alcohol) remains at the video head, the

tape may be damaged when this solution touches with the

head surface.

Never use a cloth bar (commercial sale)

(2) Wipe the tape transport system and the drive system with

the cleaning patch soaked in alcohol (Isopropyl Alcohol)

when removing foreign materials from them.

1) The part touched with the traveling tape is called as tape
transport system. The drive system consists of parts to
travel the tape.

2) Care must be exercised so that unreasonable force to
change the pattern will be applied to the tape transport
system during removal of foreign materials.

Cleaning Patch

(Cloth)

Soak alcohol
(Isopropyl Alcohol).

Drum
(Turning Cylinder)

Head Tip

Smoothly turn the drum (turning
cylinder) touching the soft surface
to the head tip surface.

Fig. C-9-4

(No.YD068)1-29

4.4.5.2 Grease Applications

(1) Grease Application Method

Apply grease by using a cloth swab or brush. Care must be
exercised so that excess quantity should not be used. If the
excessive quantity is applied, wipe it with the gauze soaked
in alcohol (Isopropyl Alcohol).

(1) Inner Side Surface and Top
Surface of Loading Path
(2) Stable Adhesion Part of Base
P2, P3
(3) Arm Pinch Shaft

2

(4) Gear Wheel Shaft
(5) Reel S. T. Shaft
(1) (2) (3) (4): KG-684G
(Green)
(5): PL-433 (Yellow)

(2) Regular Grease Application

Apply grease to the designated application position every
500 hour.

NOTE: POSITION OF GREASE APPLICATION

(1) Inner Side Surface and Top
Surface of Loading Path
(2) Stable Adhesion Part of Base
P2, P3 Coil
(3) Gear Cam Shaft
(4) Gear Drive Shaft
(5) Clutch Shaft Groove

Guide Part on the Plate Slider

(6)
Side Wall (Left)
(7)

Guide Part on the Plate Slider
Side Wall (Right)
(1) (2) (3) (4) (5) (6) (7): KG­ 684G (Green)

2

Gear Part

1

5

Chassis (TOP)

Cam Part
(PL-433.Yellow)

Gear Part
(PL-433.Yellow)

Gear Sector Gear Cam

Base Loading Gear Drive

Cam Part Side Application
(KG-684G.Green)

Boss Part Side Wall
(PL-433.Yellow)

Gear Part Side Application
(PL-433.Yellow)

4

3

3

4

6

5

7

1

Chassis (Bottom)

Cam Part

(KG-684G , GREEN)

Cam Part
(KG-684G , GREEN)

Gear Rack F/L

1-30 (No.YD068)

Inner Surface of

Guide Rail

(KG-684G.Green)

Chassis (L) Chassis (R)

Lever, Brake Driving Cam Part

Side Wall Guide Part

Lever F/R Driving Part

Plate Slider

Lever Tension Driving Cam Part

Gear Sector Driving Part

Lever, Spring Driving Part

Side Wall Guide Part