JVC DR-MX10SEK, DR-MX10SEF, DR-MX10SE Service Manual

SERVICE MANUAL

VHS & HDD & DVD VIDEO RECORDER

YD08420061

DR-MX10SE, DR-MX10SEF,

DR-MX10SEK

TM

DR-MX10SE, DR-MX10SEF, DR-MX10SEK [D5VC21]

*Since the whole mechanism assembly unit is replaced, the DVD recordermechanism of this unit need not be adjusted.
*For disassembling and assembling of VHS MECHANISM ASSEMBLY, refer to the SERVICE MANUAL No.86700
(MECHANISM ASSEMBLY).

Area Suffix

E ------- Continental Europe
Northern Europe
EF --------------------- France
EK ------------------------ U.K.

(E model)

(EF model)

(EK model)

TABLE OF CONTENTS

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

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18

COPYRIGHT © 2006 VICTOR COMPANY OF JAPAN, LIMITED

No.YD084

2006/1

SPECIFICATION

GENERAL

Power consumption

Temperature

VIDEO/AUDIO (DVD Deck)

Video recording compression system MPEG2 (CBR/VBR)

VIDEO/AUDIO (HDD Deck)

Video recording compression system MPEG2 (VBR)

VIDEO/AUDIO (VHS Deck)

Maximum recording time

INPUT/OUTPUT

TUNER/TIMER

Channel coverage (PAL B/G)

Channel coverage(SECAM-L)

• Specifications shown are for SP mode unless otherwise specified.

• E.& O.E. Design and specifications subject to change without notice.

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

• "DTS" and "DTS DIGITAL OUT" are trademarks of Digital Theater Systems, Inc.

• This product incorporates copyright protection technology that is protected by U.S. patents and other intellectual property rights. Use of this copyright pro­tection technology must be authorized by Macrovision. Reverse engineering or disassembly is prohibited.

• GUIDE Plus+, SHOWVIEW,VIDEO Plus+, G-LINK are (1) registered trademarks or trademarks of, (2) manufactured under license from and (3) subject of
various international patents and patent applications owned by, or licensed to, Gemstar-TV Guide International, Inc. and/or its related affiliates.

• GEMSTAR-TV GUIDE INTERNATIONAL, INC. AND/OR ITS RELATED AFFILIATES ARE NOT IN ANY WAY LIABLE FOR THE ACCURACY OF THE
PROGRAM SCHEDULE INFORMATION PROVIDED BY THE GUIDE PLUS+ SYSTEM. IN NO EVENT SHALL GEMSTAR-TV GUIDE INTERNATIONAL,
INC. AND /OR ITS RELATED AFFILIATES BE LIABLE FOR ANY AMOUNTS REPRESENTING LOSS OF PROFITS, LOSS OF BUSINESS, OR INDI­RECT, SPECIAL, OR CONSEQUENTIAL DAMAGES IN CONNECTION WITH THE PROVISION OR USE OF ANY INFORMATION, EQUIPMENT, OR
SERVICES RELATING TO THE GUIDE PLUS+ SYSTEM.

• i-LINK is a trademark of Sony Corp.

Power requirement AC 220 V - 240 V, 50 Hz / 60 Hz

Power on 45 W
Power off 6.7 W

Operating 5

Operating position Horizontal only

Dimensions (W

Audio recording system Dolby Digital (2 ch), Linear PCM (XP mode only)

Audio recording system Dolby Digital (2 ch), Linear PCM (XP mode only)

Recording system DA4 (Double Azimuth) head helical scan system

Signal-to-noise ratio 45 dB

Horizontal resolution 230 lines

21-pin SCART connectors IN / OUT

Component video output

Digital audio output Coaxial

TV channel storage capacity 99 positions (+AUX position)

Memory backup time Approx. 10 minutes

Storage -20

× H × D) 435 mm × 96 mm × 384 mm

Weight 6.9 kg

Recordable disc DVD-RAM 12 cm (4.7 GB/9.4 GB*1), DVD-RAM 8 cm (1.4 GB/2.8 GB*2), DVD-R 12 cm (4.7 GB)

Recording format DVD-RAM : DVD Video Recording format

Recording time Maximum 8 hours (with 4.7 GB disc)

Capacity 160 GB

Recording time (DV) : Approx. 11 hours, (XP) : Approx. 34 hours, (SP) : Approx. 69 hours

Signal system PAL colour signal and CCIR monochrome signal, 625 lines / 50 fields

Format VHS PAL standard

(SP) 240 min. with E-240 video cassette

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

Frequency range 70 Hz to 10,000 Hz (Normal audio) 20 Hz to 20,000 Hz (Hi-Fi audio)

S-video input Y: 1.0 Vp-p, 75 Ω, C: 0.3 Vp-p, 75 Ω

Video input 1.0 Vp-p, 75 Ω (pin jack)
Audio input 2 Vrms (pin jack)

i.Link 4-pin for DV Input/Output

G-LINK Ø3.5 mm jack

Tuning system Frequency synthesized tuner

Signal system PAL colour signal, 625 lines/50 fields PAL/SECAM colour signal, 625 lines/50 field

VHF : 44.5 MHz - 143 MHz/143 MHz - 470

UHF : 470 MHz - 862 MHz

Clock reference Quartz

DR-MX10SEK DR-MX10SE DR-MX10SEF

°C to 35°C

°C to 60°C

DVD-R 8 cm (1.4 GB), DVD-RW 12 cm (4.7 GB), DVD-RW 8 cm (1.4 GB)

*1 9.4 GB double-sided discs *2 2.8 GB double-sided discs

DVD-R : DVD Video format, DVD Video Recording format

DVD-RW : DVD Video format, DVD Video Recording format

(XP): Approx. 1 hour, (SP): Approx. 2 hours, (LP): Approx. 4 hours

(EP): Approx. 6 hours, (FR): Approx. 1 hour - 8 hours

(LP) : Approx. 138 hours, (EP) : Approx. 209 hours, (FR480) : Approx. 300 hours

× 1, IN / DECODER × 1

Y: 1.0 Vp-p, 75 Ω, Pb/Pr: 0.7 Vp-p, 75 Ω Corresponding to copy protection

Corresponding to Dolby Digital and DTS Digital Surround,

Bit stream Selectable in digital audio output setting menu

VHF(LOW) : 47MHz-89MHz(E2-E4,X,Y,Z)
VHF(HIGH) : 104MHz-300MHz(E5 - E12,

Hyper: 302MHz - 470MHz (S21-S41)
UHF: 470MHz - 862MHz (E21 - E69)
VHF(LOW) : 49MHz - 65MHz (2-4)
VHF(HIGH) : 104MHz-300 MHz(5-10,CATV)
Hyper : 300MHz - 470MHz (CATV)
UHF : 470MHz - 862MHz (21 - 69)

MHz

VHF : 47 MHz - 89 MHz/104 MHz - 300

MHz/302 MHz - 470 MHz

UHF : 470 MHz - 862 MHz

-

S1-S20, M1 - M10, U1 - U10)

1-2 (No.YD084)

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.YD084)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.YD084)

1.2 Hard Disk Drive (HDD) Handling Precautions

The HDD is a precision device for 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 possible to read data. The HDD is sensitive to the following
items and special care is required in safeguarding 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

1.2.1 Handling in transport, etc.

• Be sure to place the HDD in the manufacturer's specified pack­age carton before transport.

• When receiving a package containing an HDD, check that the
package carton is not damaged (such as having holes in the
carton, crushed corners, etc.).

• Do not impact the packaging carton when loading or unloading

HDD
Do not throw or
drop packages.

it.

• It is not permitted to use the inner package carton only for
transporting an HDD.

• Do not stack package cartons one upon another.

Be sure to package and
transport the HDDs correctly.

1.2.2 Handling an HDD in the stand-alone status

• 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).

• Do not stack the HDDs one upon another.

• Do not knock an HDD with a hard object (such as a screwdriv­er).

• Do not place an HDD on its side panel without using a support
(do not place an HDD in an unstable position).

1.2.3 Handling the installation of an HDD

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

• Do not permit the HDD to knock against the set's brackets.

• When screwing the brackets, be careful not to knock the HDD. When using a power screwdriver, use a low-shock model and arrange
the tightening torque properly.

• When mounting an HDD in a main body, take care not to apply excessive force to the brackets.

(No.YD084)1-5

1.3 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.

1.3.1 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 or recorder.
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.

(caption)
Anti-static wrist strap

1M

Conductive material
(conductive sheet) or iron palate

(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.

1.4 Handling the traverse unit (optical pickup)

(1) Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.
(2) Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific details, refer to the

replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long

a time when attaching it to the connector.
(3) Handle the flexible cable carefully as it may break when subjected to strong force.
(4) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.

1-6 (No.YD084)

1.5 Important for laser products

!

1.CLASS 1 LASER PRODUCT

2.DANGER : Invisible laser radiation when open and inter

lock failed or defeated. Avoid direct exposure to beam.

3.CAUTION : There are no serviceable parts inside the

Laser Unit. Do not disassemble the Laser Unit. Replace

the complete Laser Unit if it malfunctions.

4.CAUTION : The CD,MD and DVD player uses invisible

laser radiation and is equipped with safety switches which

prevent emission of radiation when the drawer is open and

the safety interlocks have failed or are defeated. It is

dangerous to defeat the safety switches.

5.CAUTION : If safety switches malfunction, the laser is able

to function.

6.CAUTION : Use of controls, adjustments or performance of

procedures other than those specified here in may result in

hazardous radiation exposure.

Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.

REPRODUCTION AND POSITION OF LABEL

On mechaism assembly

The photograph might be
different from the actual thing.

(No.YD084)1-7

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1 Different table of features

The following table indicates main different points between models DR-MX10SEK, DR-MX10SE and DR-MX10SEF.

ITEM DR-MX10SEK DR-MX10SE DR-MX10SEF

POWER PLUG 3PIN CEE ←

VHS PAL VHS PAL/MESECAM VHS PAL/MESECAM/SECAM VHS

BROADCASTING STANDARD I B/G, D/K L, L', B/G

STEREO DECODER NICAM NICAM/A2 NICAM/A2

VCR PLUS+ - - -

EPG GUIDE PLUS+ ←←

VPS/PDC X/O O/O X/O

Note:

Mark ← as same as left.

2.2 Service position

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

2.2.1 How to set the "Service position"

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

sembly of the major parts before removing the Mechanism

assembly.
(2) Remove the screws that fix the Mechanism, Main board as-

sembly to the bottom chassis. If any other screws are used

to fix the boards, remove them also.
(3) Remove the combined Mechanism, HDD, DVD unit,

switching regulator, digital, junction and Main board as-

semblies.
(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. 2-2a.)
(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

details of the precautions to be taken, see "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

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

• For some models, the mechanism and board assem-

blies 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.

Switchcing regulator
board assy

Junction board
assy

Digital board
assy

Jack board
assy

DVD WPKV

Switch display board assy

HDD

Main board assy

Operation jack board assy

TP111 D.FF

TP106 PB FM

TP2253 A.PB FM

TP4001 CTL.P

Fig.2-2a

1-8 (No.YD084)

2.3 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 unit 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 unit 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:

• When the unit is set to Jig RCU mode and when the unit

is under Jig RCU mode, the remote control unit attached
to product operates only in "Remote Control Code 1".
Since the unit is in "Remote Control Code 3" when it is
shipped and just after its batteries are changed, "Re­mote Control Code 3" needs to be changed to "Remote
Control Code 1."

• Confirm the RCU mode when exchanged parts. Since

some SERVICE PARTS sets the unit to the Jig RCU
mode as initial setting. Therefore please set the unit to
the user RCU mode after replacing the EEPROM.

User RCU mode

Jig RCU mode

( blinked)

Fig.2-3a User/Jig RCU mode

2.3.1 Changing Remote Control Code

(1) Slide the TV/CABLE/SAT/DVD switch to DVD.

(2) Press the numeric button "1" of the remote control unit

while pressing the "SET UP" button of the remote control
unit. Then,press the "ENTER" button, and then release the

"SET UP" button.
(3) Press the "POWER" button on the unit to turn off the unit.
(4) Press the "PLAY" button on the unit for over 5 seconds

while the unit is turned off. The code currently set appears

on the front display panel.
(5) Press the "STOP" button on the remote control to change

the unit’s code. When FDP indicator displays "DVD1," it

means that the Remote Control Code has been changed to

"1."

2.3.2 Setting the Jig RCU mode

(1) Turn on the power.
(2) Press the "VHS/HDD/DVD SELECT" button repeatedly on

the unit so that the VHS lamp lights up on the unit.
(3) Press the following remocon keys continuously within 2

seconds " SET UP "

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

( " : " ) in the time display of the FDP are blinked.

(Refer to Fig.2-3a User/Jig RCU mode)

2.3.3 Setting the User RCU mode

(1) Turn off the power.

→ " 2 " → " 8 " → " ENTER ".

(2) Press the "REC" and "PAUSE" buttons of the VCR simul-

taneously. Alternatively, transmit the code "43-9D" from the
Jig RCU.

2.4 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".

2.4.1 How to set the "Mechanism service mode"

(1) Set the unit to the Jig RCU mode (the mode in which codes

from the Jig RCU can be received)
(2) Transmit the code "43-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

completed, the mechanism enters the desired mode.

When the unit is set to the Mechanism service mode, the

symbols ("TIMER") in the FDP (LED) are blinked.

2.4.2 How to exit from the "Mechanism service mode"

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

2.5 Maintenance and inspection

2.5.1 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 cot-

ton 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

Fig.2-5a

2.5.2 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.

Video heads

(No.YD084)1-9

2.5.3 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 C,X X

A/C head C,X C,X

Tape
transport

Drive

Other Rotary encoder X

C : Cleaning
X : Inspection or Replacement if necessary

Pinch roller arm assembly C C

Full erase head C C

Tension arm assembly C C

Capstan motor (Shaft) C C

Guide arm assembly C C

Capstan motor X

Capstan brake assembly X

Main brake assembly X

Belt (Capstan) X X

Loading motor X

Clutch unit X

Worm gear X

Control plate X

Operation hours

1000H 2000H

1-10 (No.YD084)

SECTION 3

DISASSEMBLY

3.1 Removing the major parts

3.1.1 Destination of connectors

Two kinds of double-arrows in connection tables respectively

show kinds of connector/wires.

: The connector of the side to remove

CONN. No. PIN No.CONNECTOR

WR2a

WR2b

Main CN101

Main CN103

 Destination of connectors

CONN. No. PIN No.CONNECTOR

WR2a

WR2b

WR3a

WR3b

WR4a

WR4b

WR5a

CN7108
(CN1101)

CN7109
(CN1102)

CN4104
(CN1801)

WR7a

WR7b

WR7c

WR7d

WR7e

WR7f

WR8a

WR8b

WR8c

WR8d

Main

Main

Main

Drum
assembly

DVD unit

DVD unit

HDD

Junction

Junction

Jack

Junction

Main

Main

Junction

SW. REG.

Digital

SW. REG.

SW. REG.

Junction

SW. REG.

3.1.2 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 3-1a

Part Name

Bracket 2(S1c)

: Wire: Flat wire : Board to board (B-B)

Digital CN761

Digital CN762

CN7112

CN3102

CN2001

CN7108

CN7109

CN4104

CN7104

CN3103

CN2601

CN7107

CN5304

CN1103

CN5301

CN5302

CN5504

CN5303

Operation/jack

Switch/display

A/C head

Main

Digital

SW. REG.

Digital

Digital

Digital

Digital

Video switch

Junction

Junction

Main

Junction

Junction

Main

Fan motor

HDD

DVD unit

Fig.
No.

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

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

CN7201

CN7001

CN2201

CN5303

CN2101

CN1101

CN1102

CN1801

CN501

CN7102

CN8001

CN7111

CN5501

CN7110

CN5311

Point Note

CN1

40

10

9

15

6

7

40

4

40

15

15

9

4

19

11

13

19

19

15

2

4

4

(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

3.1.3 Disassembly procedure

Step/

Loc No.

[1]
[2]

[3]

[4]

[5]

[7]

[8]

[9]

[10]
[11]

Part Name

Top cover
Front panel assembly
(Operation/jack board assembly)
(Switch/display board assembly)
Mechanism assembly

(Drum assembly)

DVD unit
(Bracket)
Digital board assembly
and Jack board assembly
Junction board assembly

Switching Regulator
board assembly

Rear cover
HDD(Bracket, sheet)
Main board assembly

Fig.
No.

3-1e
3-1a
3-1d
3-1e
3-1b
3-1c
3-1d
3-1e
3-1e
3-1d
3-1d
3-1e
3-1d
3-1e

3-1d
3-1e

3-1e
3-1e
3-1e

Point Note

8(S1a)
3(L2a),5(L2b)
CN7112(WR2a)
CN3102(WR2b)
CN2001(WR3a)
3(S3a),(S3b)
CN1(WR3b)
(S3c),(S3d),(S3e)
4(S4a),4(S4b)
(WR4a),(WR4b)
4(S5a),CN2101(WR5a)(S5b)
CN7108(CN1101),CN7109(CN1102)
(S7a),CN7104(WR7a),
CN3103(WR7b),CN2601
(WR7c),CN7104(WR7d),
CN5304(WR7e),CN5504(WR8c)
4(S8a)
CN5301(WR8a),
CN5302(WR8b),
CN5303(WR8c),
CN5304(WR7e)
(S9a),7(S9b),2(S9c),3(L9a)
4(S10a),4(S10b)
3(S11a)

<Note2a>
<Note2b>

<Note2a>
<Note3a>
<Note3b>

<Note2a>

<Note2a>

<Note2a>

<Note2a>

< Note 2a >

• 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.

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

(1) Order of steps in Procedure

When reassembling, perform the step(s) in the reverse or­der.
These numbers are also used as the identification (loca-

tion) No. of parts Figures.
(2) Part name to be removed or installed.
(3) Fig. No. showing procedure or part location.

(No.YD084)1-11

< Note 2b >

• 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.

• 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 3c >

• When reattaching the Drum assembly, secure the screws (S3c
to S3e) in the order of c, d, e.

Mechanism
assembly

(S3d)

(S3c)

(S3e)

(S3d)

(S3e)

Door
opener

Side
frame(R)

Switch
knob

Switch
lever

Fig.3-1a

< Note 3a >

• When reattaching the Mechanism assembly, secure the
screws (S3a to S3b) in the order of 1,2,3.

< Note 3b >

• 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 “MECHANISM ASSEMBLY
SERVICE MANUAL (No. 86700)”.]

CN501

After Assembling
FRONT PANEL

MAIN BOARD ASSY

CN7201

CN7112

DISPLAY/SWITCH
BOARD ASSY
Soldering side

CN7112

from FRONT PANEL

(OPE JACK CN7201)

(WR2a) <Note 2a>

OPERATON JACK BOARD ASSY<27>

(WR3b)
<Note 2a>

Drum
assembly

<Note 3c>

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

(S3c)

HOOK

Fig.3-1b

• 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.

Shaft

Motor

Video heads

Fig.3-1c

FAN

(WR7a)
<Note 2a>

A/C HEAD

CN2001

(WR3a)
<Note 2a>

BOTTOM SIDE

(WR7d)
<Note 2a>

(WR8a)
<Note 2a>

(WR7c)

(WR7b)

CN3102

CN2601

CN3103

CN8001

CN7102

(WR8b)

CN5302

CN5301

(WR8c)

CN5303

CN7107

CN7104

(WR4b)

(WR7f)
<Note 2a>

DRIVE
UNIT

CN7110

CN7109 CN7108

CN7111

CN5311

DV JACK BOARD ASSY

(WR2b) <Note 2a>

DISPLAY/SWITCH BOARD ASSY<28>

CN5001

SWITCHING REGULATOR
BOARD ASSY

(WR5a)

(WR7e)
<Note 2a>

CN5304

CN5501

<Note 2a>

D

JUNCTION BOARD ASSY

CN5504

CN2101

CN1103

CN1102 CN1101

CN2201

(WR4a)
<Note 2a>

DIGITAL BOARD

CN1801

ASSY

CN4104

1-12 (No.YD084)

CN7201

J7

201

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

OPERATON JACK BOARD ASSY

parts surface

CN7202

FW7001

Fig.3-1d

TOP SIDE

CN7001

060807

05

1

34 876

52

9
10
11
12

NOTE)WHEN YOU FIX ANY PWB WITH THE SCREW,
PUT IT ON THE JIGS.

(S1a)

NOTE

1. Insert direction of FFC WIRE as follows.

right side

electrode side

2. FFC WIRE and DRUM FPC WIRE
should be insert as follows.

OK

CN

back side

supporting side

NG

90

CN

CN

3. Insert direction of POWER CORD.
US/UC/JPN

WHITE LINE

NEUTRAL

CN5001

except US/UC/JPN

BLUE

NEUTRAL

CN5001

JS3001

<Phase alignment>
.

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

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

(L2b)

(L2b)

(L2a)

j

j

[2] Front panel assembly
<Note 2b>

(S1a)

(S3a) <Note 3a>

j

(S3c) <Note 3b>

(S3e) <Note 3b>

(S3d) <Note 3b>

(S11a)

(L2a)

j

(L2b)

(L9a)

3

j

[9] Rear cover

[3] Drum
assembly

1

g

h

d

JS3001

(S11a)

C

a

a

i

a

b

e

(S9a)

(S9b)

(L9a)

[3] VHS Mechanism
assembly

(S3a)

2

<Note 3a>

(S3b) <Note 3a>

C

N

914

C

N

9

13

C
N

91

N

7
1

1

3

C
N

7
1

5

1
4

C

N

7
1

1

5

(S11a)

g

h

j

a

a

a

b

e

e

u

u

b

d

e

Fig.3-1e

[1] Top cover

(S9b)

s

s

(L9a)

J9

05

J
90

7

[11] Main board
assembly

i

c

c

b

e

t

(S1a)

(S9c)

f

s

a

(S1a)

[10] HDD

r

r

(S10a)

(S10b)

c

c

i

[7] Junction board
assembly

(S1a)

(S8a)

1

CN5302

r

(S10a)

c

(S10b)

(S4a)

b

[5] Digital board
assembly

(S5a)

(S7a)

d

3

t

r

c

r

r

[10] Bracket

A

e'

e'

e

CN5001

(S4b)

d

c

2

r

f

(S8a)

b

t

(S8a)

[8] Switching regulator
board assembly

4

(S10b)

(S10b)

r

[4] DVD Unit

(S4a)

b

(S4a)

(S5b)

e'

e'

(S5a)

e'

e

e'

e'

e

e

[10] Sheet

[4] Bracket

(S4a)

b

(S4b)

(S5a)

e'

e

(S10a)

(S10a)

(No.YD084)1-13

SECTION 4

ADJUSTMENT

4.1 Before adjustment

4.1.1 Precaution

• The adjustments of this unit include the mechanism com-

patibility 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.

4.1.2 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 [PAL]

• Recording tape

• Digit-key remote controller(provided)

4.1.3 Required adjustment tools

--- : Not used

z

: Used

Roller driver

Mechanism

compatibility

adjustment

z ---

Electrical

adjustment

Jig RCU --- z

Back tension cassette gauge z ---

Alignment tape(MHPE) z ---

Alignment tape(MHPE-L) zz

Roller driver

PTU94002

Alignment tape

(SP, stairstep, PAL)

MHPE

Jig RCU

PTU94023B

Alignment tape

(LP, stairstep, PAL)

MHPE-L

Back tension cassette gauge

PUJ48076-2

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

Colour bar signal [PAL]

White(100%)

White(75%)

0.7 V

1V

0.3 V

Horizontal sync

Yellow

Cyan

Green

Magenta

Red

VU

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

Blue

Burst

Colour bar pattern [PAL]

(75%)

Cyan

White

Yellow

0.3 V

V

White

U Black

100%

Green

Magenta

Red

Blue

4.1.5 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 unit to the Jig
RCU mode (the mode in which codes from the Jig RCU can be
received). (See "section 2 SPECIFIC SERVICE INSTRUC­TIONS".)

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.4-1a 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 NORMAL/NATURAL
VIDEO STABILIZER OFF
TBC ON
Digital 3R ON
VIDEO NAVIGATION/TAPE MANAGER OFF
BLUE BACK OFF

OFF

4.1.6 Manual tracking mode (Auto tracking ON/OFF) set-

ting

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

playback, press the “CHANNEL +/-”button on the unit si­multaneously.

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

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

4.1.7 EVR Adjustment

Some of the electrical 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 adjust-

ment 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.

1-14 (No.YD084)

Digit-key0123456789
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.

FDP

TENSION ARM

Stamping(b)

OK

CONTROL PLATE

Stamping(a)

Fig.4-1b EVR mode

4.2 Mechanism compatibility adjustment (VHS SECTION)

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 compat-

ibility 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.4-2b.)

4.2.1 Tension pole position

Notes:

• This adjustment must be performed every time the ten-

sion band is replaced.

Signal (A) • Back tension cassette gauge [PUJ48076-2]

Mode (B1)

Adjustment part (F) • Adjust pin [Mechansim assembly]

Specified value (G)

•PB

(B2)

• Eject end

• 25 - 51 gf•cm (2.45 - 5 x 10

-3

Nm)

(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.4-2a.)

a) Remove the top frame, cassette holder and side

frames (L/R) all together. (Refer to the SERVICE
MANUAL No.86700 [MECHANISM ASSEMBLY].)

b) 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).

c) Adjust by turning the adjustment pin so that the tip of

the tension arm is aligned with the stamping (b) on
the main deck.

d) 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.

ADJUST PIN

NG

Fig.4-2a

4.2.2 FM waveform linearity

Signal (A1)

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]

(A2)

• 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. 4-2c.)
(5) Reduce the V.PB FM waveform by the tracking operation.

If a drop in level is found on the left side, turn the guide roll-

er 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. 4-2c.)
(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. 4-2b.)

[Perform adjustment step (9) only for the models equipped

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

[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

(a)

GUIDE ROLLER

Proper

(b)

GUIDE POLE

Fig.4-2b

(No.YD084)1-15

Proper waveform variation

Improper waveform variation

A

C

Up Down

B

D

Roller driver

Guide roller
(supply side)

Fig.4-2c

4.2.3 Height and tilt of the A/C head

Note:

• Set a temporary level of the height of the A/C head in ad-

vance to make the adjustment easier after the A/C head
has been replaced. (Refer to the SERVICE MANUAL
No.86700 [MECHANISM ASSEMBLY].)

Signal (A) • Alignment tape(SP, stairstep, PAL) [MHPE]
Mode (B) • PB
Equipment (C) • Oscilloscope
Measuring point (D1)

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

• TP106 (PB. FM)

(D2)

• TP4001 (CTL. P)

(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 unit to the manual tracking mode.
(4) Adjust the AUDIO OUT waveform and Control pulse wave-

form 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)

(1)

AUDIO OUT

4.2.4 A/C head phase (X-value)

Signal (A1)

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

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

(A2)

• 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) Loosen the screws (4) and (5), then set the Roller driver to

the innermost projected part of the A/C head. (See Fig. 4-

2e.)
(5) Rotate the roller driver so that the A/C head comes closest

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

ually toward the drum until the point where the FM wave-

form 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-tracking

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 cen-

ter position.

To the drum

Toward the capstan

Toward the drum

A/C head

Screw (5)

Roller driver

Screw (4)

Head base

To the capstan

Fig.4-2e

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

Waveform output

X-value adjustment point

Drum side Control head position Capstan side

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

A/C head

(3)

1-16 (No.YD084)

Fig.4-2d

CTL. P

Maximum

Fig.4-2f

4.3 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.

4.3.1 Servo circuit

4.3.1.1 Switching point

Signal (A1)

Mode (B) • PB
Equipment (C) • Oscilloscope
Measuring point (D) • VIDEO OUT terminal (75 ohm terminated)

External trigger (E) • TP111 (D.FF)
Adjustment part (F) • Jig RCU: Code “43-5A”
Specified value (G) • 6.5 ± 0.5H
Adjustment tool (H) • Jig RCU [PTU94023B]

• Stairstep signal

(A2)

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

• TP106 (PB. FM)

(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

measuring 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

(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 “43-

08” from the Jig RCU to enter the slow playback mode,
and transmit the code “43-D0”for REV slow (-1/6x)
mode.

4.3.2 Syscon circuit

4.3.2.1 Timer clock

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

Adjustment part (F) • C3025 (TIMER CLOCK)
Specified value (G) • 1024.008 ± 0.01 Hz

• IC3001 pin 61

• IC3001 pin 24

(D2)

• C3026 + and -

(D3)

(976.5549 ± 0.0010 usec)

(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 frequency

becomes the specified value (G).

V. rate

Fig.4-3a Switching point

4.3.1.2 Slow tracking preset

Signal (A1)

Mode (B1)

Measuring point (D) • TV-Monitor
Adjustment part (F) • Jig RCU: Code “43-71”or “43-72”
Specified value (G) • minimum noise
Adjustment tool (H) • Jig RCU [PTU94023B]

• Ext. input

(A2)

• Color (colour) bar signal [PAL]

• VHS SP

(B2)

•VHS LP

(No.YD084)1-17