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SERVICE MANUAL
VIDEO CASSETTE DECK
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
SM0410
2004
Digital Media Division
April
DO NOT RESELL OR DIVERT IMPROPERLY.
DO NOT RESELL OR DIVERT IMPROPERLY.
VT-FX440E(UK)
VT-MX410E(UK)
VT-FX540E(UK)


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CONTENTS
1 CAUTIONS FOR SAFETY IN PERFORMING
REPAIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1-1 IMPORTANT SAFETY PRECAUTIONS . . . . . . . . 1-1
1-1-1 Product Safety Notice . . . . . . . . . . . . . . . . . . . . 1-1
1-1-2 Precautions during Servicing . . . . . . . . . . . . . . 1-1
1-1-3 Safety Check after Servicing . . . . . . . . . . . . . . . 1-2
1-2 STANDARD NOTES FOR SERVICING . . . . . . . . . 1-3
1-2-1 Circuit Board Indications . . . . . . . . . . . . . . . . . . 1-3
1-2-2 Instructions for Connectors . . . . . . . . . . . . . . . . 1-3
1-2-3 Pb (Lead) Free Solder . . . . . . . . . . . . . . . . . . . . 1-3
1-2-4 Instructions for Handling Semi-conductors . . . . 1-3
2 GENERAL INFORMATION . . . . . . . . . . . . . . . 2-1
2-1 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2-2 COMPARISON OF MODELS. . . . . . . . . . . . . . . . . 2-3
2-2-1 Comparison of Features . . . . . . . . . . . . . . . . . . 2-3
2-2-2 Comparison of Main Control ICs . . . . . . . . . . . . 2-4
2-3 FUNCTION INDICATOR SYMBOLS . . . . . . . . . . . 2-5
2-4 OPERATING CONTROLS AND FUNCTIONS. . . . 2-7
3 MAINTENANCE AND INSPECTION. . . . . . . . 3-1
3-1 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . 3-1
3-2 STANDARD MAINTENANCE. . . . . . . . . . . . . . . . . 3-6
3-2-1 Service Schedule of Components . . . . . . . . . . . 3-6
3-2-2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
4 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4-1 CABINET DISASSEMBLY INSTRUCTIONS . . . . . 4-1
4-1-1 Disassembly Flowchart . . . . . . . . . . . . . . . . . . . 4-1
4-1-2 Disassembly Method . . . . . . . . . . . . . . . . . . . . . 4-1
4-2 DISASSEMBLY/ASSEMBLY PROCEDURES
OF DECK MECHANISM . . . . . . . . . . . . . . . . . . . . 4-4
4-3 ALIGNMENT PROCEDURES OF MECHANISM. 4-13
5 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5-1 PREPARATION FOR SERVICING. . . . . . . . . . . . . 5-1
5-1-1 How to Enter the Service Mode. . . . . . . . . . . . . 5-1
5-2 FIXTURE AND TAPE FOR ADJUSTMENT . . . . . . 5-2
5-2-1 How To Use The Fixtures And Tape . . . . . . . . . 5-2
5-3 ELECTRICAL ADJUSTMENT INSTRUCTIONS . . 5-3
5-3-1 Test Equipment Required . . . . . . . . . . . . . . . . . 5-3
5-3-2 Head Switching Position Adjustment. . . . . . . . . 5-3
5-4 MECHANICAL ALIGNMENT PROCEDURES . . . . 5-4
5-4-1 Service Information . . . . . . . . . . . . . . . . . . . . . . 5-4
5-4-2 Tape Interchangeability Alignment . . . . . . . . . . 5-5
1-A. Preliminary/Final Checking and
Alignment of Tape Path . . . . . . . . . . . . . . . . . . . 5-6
1-B. X Value Alignment . . . . . . . . . . . . . . . . . . . . . . . 5-6
1-C. Checking/Adjustment of Envelope Waveform . . 5-7
1-D. Azimuth Alignment of
Audio/Control/Erase Head. . . . . . . . . . . . . . . . . 5-8
6 EXPLODEDS VIEWS AND PARTS LIST . . . . 6-1
6-1 EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . 6-1
6-1-1 Cabinet Section . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
6-1-2 Deck Mechanism View 1 Section . . . . . . . . . . . 6-2
6-1-3 Deck Mechanism View 2 Section . . . . . . . . . . . 6-3
6-1-4 Deck Mechanism View 3 Section . . . . . . . . . . . 6-4
6-2 REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . 6-5
6-2-1 Mechanical Parts List . . . . . . . . . . . . . . . . . . . . 6-5
6-2-2 Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . 6-5
7 APPENDIX. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
7-1 SYSTEM CONTROL TIMING CHARTS . . . . . . . . 7-1
7-2 IC PIN FUNCTION DESCRIPTIONS . . . . . . . . . . . 7-8
7-3 LEAD IDENTIFICATIONS . . . . . . . . . . . . . . . . . . 7-11
S SCHEMATIC, WIRING DIAGRAMS
S-1 Schematic Diagrams/PCB's and Test Points . . . . . S-1
S-2 Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . S-3
S-3 Main 1/7 Schematic Diagram . . . . . . . . . . . . . . . . . S-4
S-4 Main 2/7, Sensor Schematic Diagram . . . . . . . . . . S-5
S-5 Main 3/7 Schematic Diagram . . . . . . . . . . . . . . . . . S-6
S-6 Main 4/7, Jack, Sub Jack Schematic Diagram . . . . S-7
S-7 Main 5/7 Schematic Diagram . . . . . . . . . . . . . . . . . S-8
S-8 Main 6/7 Schematic Diagram ( VT-FX440E(UK) ) . S-9
S-9 Main 7/7 Schematic Diagram . . . . . . . . . . . . . . . . S-10
S-10 AFV Schematic Diagram ( VT-FX440E(UK) ). . . . S-11
S-11 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-12
C CIRCUIT BOARD DIAGRAMS
C-1 Main PCB, Sensor PCB Top View . . . . . . . . . . . . . C-1
C-2 Main PCB Bottom View . . . . . . . . . . . . . . . . . . . . . C-2
C-3 Jack PCB Top / Bottom View . . . . . . . . . . . . . . . . . C-3
C-4 AFV PCB Top View / Bottom View,
Sub Jack PCB Top View / Bottom View
( VT-FX440E(UK) ) . . . . . . . . . . . . . . . . . . . . . . . . . C-4
B BLOCK DIAGRAMS
B-1 Servo/System Control Block Diagram . . . . . . . . . . B-1
B-2 Video Block Diagram . . . . . . . . . . . . . . . . . . . . . . . B-2
B-3 Audio Block Diagram ( VT-MX410E(UK) ) . . . . . . . B-3
B-4 Audio Block Diagram ( VT-FX440E(UK) ). . . . . . . . B-4
B-5 Hi-Fi Audio Block Diagram ( VT-FX440E(UK) ) . . . B-5
B-6 Power Supply Block Diagram . . . . . . . . . . . . . . . . . B-6
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1-1
1-1 IMPORTANT SAFETY PRECAUTIONS
1-1-1 Product Safety Notice
Some electrical and mechanical parts have special
safety-related characteristics which are often not evi-
dent from visual inspection, nor can the protection
they give necessarily be obtained by replacing them
with components rated for higher voltage, wattage,
etc. Parts that have special safety characteristics are
identified by a ! on schematics and in parts lists.
Use of a substitute replacement that does not have
the same safety characteristics as the recommended
replacement part might create shock, fire, and/or
other hazards. The Product's Safety is under review
continuously and new instructions are issued when-
ever appropriate. Prior to shipment from the factory,
our products are carefully inspected to confirm 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 impor-
tant to implement the following precautions when a
set is being serviced.
1-1-2 Precautions during Servicing
A. Parts identified by the ! symbol are critical for
safety. Replace only with part number specified.
B. In addition to safety, other parts and assemblies
are specified for conformance with regulations
applying to spurious radiation. These must also be
replaced only with specified replacements.
Examples: RF converters, RF cables, noise block-
ing capacitors, and noise blocking filters, etc.
C. Use specified internal wiring. Note especially:
1)Wires covered with PVC tubing
2)Double insulated wires
3)High voltage leads
D. Use specified insulating materials for hazardous
live parts. Note especially:
1)Insulation tape
2)PVC tubing
3)Spacers
4)Insulators for transistors
E. When replacing AC primary side components
(transformers, power cord, etc.), wrap ends of
wires securely about the terminals before solder-
ing.
F. Observe that the wires do not contact heat produc-
ing parts (heatsinks, oxide metal film resistors, fus-
ible resistors, etc.).
G. Check that replaced wires do not contact sharp
edges or pointed parts.
H. When a power cord has been replaced, check that
5 - 6 kg of force in any direction will not loosen it.
I. Also check areas surrounding repaired locations.
J. Be careful that foreign objects (screws, solder
droplets, etc.) do not remain inside the set.
K. Crimp type wire connector
The power transformer uses crimp type connec-
tors which connect the power cord and the primary
side of the transformer. When replacing the trans-
former, follow these steps carefully and precisely
to prevent shock hazards.
Replacement procedure
1)Remove the old connector by cutting the wires at
a point close to the connector.
Important: Do not re-use a connector. (Discard
it.)
2)Strip about 15 mm of the insulation from the ends
of the wires. If the wires are stranded, twist the
strands to avoid frayed conductors.
3)Align the lengths of the wires to be connected.
Insert the wires fully into the connector.
4)Use a crimping tool to crimp the metal sleeve at
its center. Be sure to crimp fully to the complete
closure of the tool.
L. When connecting or disconnecting the internal
connectors, first, disconnect the AC plug from the
AC outlet.
CAUTION FOR SAFETY IN PERFORMING REPAIR
1


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1-2
AC Voltmeter
(High Impedance)
Exposed Accessible Part
B
One side of
Power Cord Plug Prongs
Z
Chassis or Secondary Conductor
d
d'
Primary Circuit Terminals
1-1-3 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 their original
positions. Afterwards, do the following tests and con-
firm the specified values to verify compliance with
safety standards.
1. Clearance Distance
When replacing primary circuit components, confirm
specified clearance distance (d) and (d') between sol-
dered terminals, and between terminals and sur-
rounding metallic parts. (See Fig. 1-1-1)
Table 1-1-1 : Ratings for selected area
Note: This table is unofficial and for reference only.
Be sure to confirm the precise values.
2. Leakage Current Test
Confirm the specified (or lower) leakage current
between B (earth ground, power cord plug prongs)
and externally exposed accessible parts (RF termi-
nals, antenna terminals, video and audio input and
output terminals, microphone jacks, earphone jacks,
etc.) is lower than or equal to the specified value in the
table below.
Measuring Method (Power ON) :
Insert load Z between B (earth ground, power cord
plug prongs) and exposed accessible parts. Use an
AC voltmeter to measure across the terminals of load
Z. See Fig. 1-1-2 and the following table.
AC Line Voltage
Clearance Distance (d), (d')
220 to 240 V
3 mm(d)
6 mm(d')
Table 1-1-2: Leakage current ratings for selected areas
Note: This table is unofficial and for reference only. Be sure to confirm the precise values.
AC Line Voltage
Load Z
Leakage Current (i)
One side of power cord plug
prongs (B) to:
220 to 240 V
2k
RES.
Connected in parallel
i
0.7mA AC Peak
i
2mA DC
RF or
Antenna terminals
50k
RES.
Connected in parallel
i
0.7mA AC Peak
i
2mA DC
A/V Input, Output
Fig. 1-1-1
Fig. 1-1-2


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1-3
1-2 STANDARD NOTES FOR SERVICING
1-2-1 Circuit Board Indications
1. The output pin of the 3 pin Regulator ICs is indi-
cated as shown.
2. For other ICs, pin 1 and every fifth pin are indi-
cated as shown.
3. The 1st pin of every male connector is indicated as
shown.
1-2-2 Instructions for Connectors
1. When you connect or disconnect the FFC (Flexible
Foil Connector) cable, be sure to first disconnect
the AC cord.
2. FFC (Flexible Foil Connector) cable should be
inserted parallel into the connector, not at an
angle.
1-2-3 Pb (Lead) Free Solder
When soldering, be sure to use the Pb free solder.
1-2-4 Instructions for Handling
Semi-conductors
Electrostatic breakdown of the semi-conductors may
occur due to a potential difference caused by electro-
static charge during unpacking or repair work.
1. Ground for Human Body
Be sure to wear a grounding band (1M
) that is prop-
erly grounded to remove any static electricity that may
be charged on the body.
2. Ground for Workbench
(1) Be sure to place a conductive sheet or copper
plate with proper grounding (1M
) on the work-
bench or other surface, where the semi-conduc-
tors are to be placed. Because the static electricity
charge on clothing will not escape through the
body grounding band, be careful to avoid contact-
ing semi-conductors with your clothing.
Top View
Out
In
Bottom View
Input
5
10
Pin 1
Pin 1
FFC Cable
Connector
PCB
* Be careful to avoid a short circuit.
PCB
< Incorrect >
PCB
Grounding Band
Conductive Sheet or
Copper Plate
1M
1M
< Correct >