Hitachi vt-fx240e Service Manual
TK No. 5204E
VT-FX240EUK
SERVICE MANUAL
VT-MX210EUK
This video deck is VHS type video
recorder. For proper operation, only
the VHS type cassette must be
used.
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
VIDEO CASSETTE RECORDER
June 2002
Digital Media Division, Tokai
CONTENTS
CHAPTER 1 GENERAL INFORMATION
SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1-1
FUNCTION INDICATOR SYMBOLS . . . . . . . . . . . . . . 1-2-1
IMPORTANT SAFETY PRECAUTIONS . . . . . . . . . . . . 1-3-1
Product Safety Notice . . . . . . . . . . . . . . . . . . . . . . . . . 1-3-1
Precautions during Servicing. . . . . . . . . . . . . . . . . . . . 1-3-1
Safety Check after Servicing . . . . . . . . . . . . . . . . . . . . 1-3-2
STANDARD NOTES FOR SERVICING . . . . . . . . . . . . 1-4-1
Circuit Board Indications . . . . . . . . . . . . . . . . . . . . . . . 1-4-1
Instructions for Connectors . . . . . . . . . . . . . . . . . . . . . 1-4-1
How to Remove/Install Flat Pack-IC . . . . . . . . . . . . . . 1-4-1
Instructions for Handling
Semi-conductors . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4-3
PREPARATION FOR SERVICING . . . . . . . . . . . . . . . . 1-5-1
How to Enter the Service Mode. . . . . . . . . . . . . . . . . . 1-5-1
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . 1-6-1
ORERATING CONTROLS AND FUNCTIONS . . . . . . . 1-7-1
CHAPTER 2 DISASSEMBLY AND ADJUSTMENT
CABINET DISASSEMBLY INSTRUCTIONS . . . . . . . . 2-1-1
1. Disassembly Flowchart . . . . . . . . . . . . . . . . . . . . . . 2-1-1
2. Disassembly Method . . . . . . . . . . . . . . . . . . . . . . . . 2-1-1
DISASSEMBLY/ASSEMBLY PROCEDURES OF
DECK MECHANISM . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2-1
ALIGNMENT PROCEDURES OF MECHANISM . . . . . 2-3-1
ELECTRICAL ADJUSTMENT INSTRUCTIONS . . . . . 2-4-1
Test Equipment Required . . . . . . . . . . . . . . . . . . . . . . 2-4-1
Head Switching Position Adjustment. . . . . . . . . . . . . . 2-4-1
FIXTURE AND TAPE FOR ADJUSTMENT . . . . . . . . . 2-5-1
How to Use The Fixtures. . . . . . . . . . . . . . . . . . . . . . . 2-5-1
MECHANICAL ALIGNMENT PROCEDURES . . . . . . . 2-6-1
Service Information . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6-1
1.Tape Interchangeability Alignment. . . . . . . . . . . . . . 2-6-2
1-A.Preliminary/Final Checking and
Alignment of Tape Path . . . . . . . . . . . . . . . . . . . 2-6-3
1-B.X Value Alignment . . . . . . . . . . . . . . . . . . . . . . . . 2-6-3
1-C.Checking/Adjustment of Envelope Waveform . . . 2-6-4
1-D.Azimuth Alignment of
Audio/Control/Erase Head . . . . . . . . . . . . . . . . .2-6-4
STANDARD MAINTENANCE . . . . . . . . . . . . . . . . . . . . 2-7-1
Service Schedule Components . . . . . . . . . . . . . . . . . . 2-7-1
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7-2
CHAPTER 4
SCHEMATIC DIAGRAMS/CBA’S AND
TEST POINTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1-1
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1-3
Main 1/5 Schematic Diagram . . . . . . . . . . . . . . . . . . . 4-1-4
Main 2/5 Schematic Diagram . . . . . . . . . . . . . . . . . . . 4-1-5
Main 3/5 Schematic Diagram . . . . . . . . . . . . . . . . . . . 4-1-6
Main 4/5 Schematic Diagram . . . . . . . . . . . . . . . . . . . 4-1-7
Main 5/5 Schematic Diagram ( VT-FX240EUK ). . . . . 4-1-8
Function Schematic Diagram . . . . . . . . . . . . . . . . . . . 4-1-9
AFV Schematic Diagram ( VT-FX240EUK ) . . . . . . . 4-1-10
Jack Schematic Diagram. . . . . . . . . . . . . . . . . . . . . . 4-1-11
Main CBA Top View . . . . . . . . . . . . . . . . . . . . . . . . . 4-1-12
Main CBA Bottom View. . . . . . . . . . . . . . . . . . . . . . . 4-1-13
Function/Power SW CBA Top/Bottom View . . . . . . . 4-1-14
AFV CBA Top/Bottom View. . . . . . . . . . . . . . . . . . . . 4-1-15
Jack CBA Top/Bottom View . . . . . . . . . . . . . . . . . . . 4-1-16
BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2-1
Servo/System Control Block Diagram . . . . . . . . . . . . 4-2-1
Video Block Diagram(VT-MX210EUK) . . . . . . . . . . . . 4-2-2
Video Block Diagram(VT-FX240EUK). . . . . . . . . . . . . 4-2-3
Audio Block Diagram(VT-MX210EUK) . . . . . . . . . . . . 4-2-4
Audio Block Diagram(VT-FX240EUK). . . . . . . . . . . . . 4-2-5
Hi-Fi Audio Block Diagram(VT-FX240EUK) . . . . . . . . 4-2-6
Power Supply Block Diagram . . . . . . . . . . . . . . . . . . . 4-2-7
SYSTEM CONTROL TIMING CHARTS . . . . . . . . . . . . 4-3-1
IC PIN FUNCTION DESCRIPTIONS . . . . . . . . . . . . . . 4-4-1
LEAD IDENTIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . 4-5-1
SCHEMATIC AND BLOCK DIAGRAMS/
CBA’S
CHAPTER 3 EXPLODED VIEWS AND PARTS LIST
EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1-1
Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1-1
Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1-2
Deck Mechanism View 1 . . . . . . . . . . . . . . . . . . . . . . . 3-1-3
Deck Mechanism View 2 . . . . . . . . . . . . . . . . . . . . . . . 3-1-4
Deck Mechanism View 3 . . . . . . . . . . . . . . . . . . . . . . . 3-1-5
REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . 3-2-1
Mechanical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . 3-2-1
Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2-3
CHAPTER 1 GENERAL INFORMATION
SPECIFICATIONS
VT-FX240EUK VT-MX210EUK
General Specifications
Television system: PAL I
Video heads Six comprising of Four-video
Tape width : 12.65mm
Tape speed
SP : 23.39mm/s
LP : 11.70mm/s
Tuner channel
RF converter : Built-in UHF converter
Converter output : UHF Channel 22 to 69
Timer indication : 24-hour system
Operating temperature : 5
Terminals
AERIAL : Coaxial type, male
RF OUT : Coaxial type, female
AUDIO/VIDEO : 21 pin scart socket x 2
AUDIO output
: RCA connector x 2
TV standard
and Two-audio heads
Helical scan system
IRA to IRJ
E21 to E69
CATV
(adjustable)
C to 40 C
Electrical Specifications
Video output level : 1Vp-p
Video output impedance : 75Ω unbalanced
Audio output level : -6dBv
Video input level : 0.5 to 2.0Vp-p
Audio input level : -10dBv
Video S/N ratio
(STANDARD): 45dB
Audio S/N ratio
(STANDARD): 41dB
General Specifications
Television system: PAL I
Video heads Rotary two-head
Tape width : 12.65mm
Tape speed
SP : 23.39mm/s
LP : 11.70mm/s
Tuner channel
RF converter : Built-in UHF converter
Converter output : UHF Channel 22 to 69
Timer indication : 24-hour system
Operating temperature : 5
Terminals
AERIAL : Coaxial type, male
RF OUT : Coaxial type, female
AUDIO/VIDEO :
TV standard
Helical scan system
IRA to IRJ
E21 to E69
CATV
(adjustable)
C to 40 C
21 pin scart socket x 2
Electrical Specifications
Video output level : 1Vp-p
Video output impedance : 75Ω unbalanced
Audio output level : -6dBv
Video input level : 0.5 to 2.0Vp-p
Audio input level : -10dBv
Video S/N ratio
(STANDARD): 45dB
Audio S/N ratio
(STANDARD): 41dB
Other Specifications
Power requirement : 220-240V to 50Hz
Power consumption : 20 Watts (Stand by:3.3 watts)
Dimensions : W 360mm
H 92mm
D 226mm
Weight : 2.6 kg. (approx.)
Designs and specifications are subject to change without notice.
Other Specifications
Power requirement : 220-240V to 50Hz
Power consumption : 20 Watts (Stand by: 3.3 watts)
Dimensions : W 360mm
H 92mm
D 226mm
Weight : 2.6 kg. (approx.)
1-1-1
FUNCTION INDICATOR SYMBOLS
Note:
The following symbols will appear on the indicator panel to indicate the current mode or operation of the VCR.
On-screen modes will also be momentarily displayed on the tv screen when you press the operation buttons.
Display panel
PWR. REC
" H "= LED Light on, " L "= LED Light off
LED MODE INDICATOR ACTIVE
CASSETTE "IN"
CASSETTE "OUT"
CLOCK " 88:88 "
POWER ON " PWR. " ON
REC " REC " ON
REC PAUSE " REC " Blinks at 0.8Hz interval
T-REC, OTR " " ON
When reel and capstan mechanism is not
functioning correctly
When tape loading mechanism is not functioning correctly
When cassette loading mechanism is not
functioning correctly
When the drum is not working properly " "
S-INH condition All modes Blinks at 0.8Hz interval
" "
" "
" PM "
" "
" 1 "
" "
" 2 "
" "
" 3 "
" 4 "
ON
OFF
ON
ON/OFF
(T-REC OFF, T-REC incomplete
Blinks at 0.8Hz interval)
Blinks at 0.8Hz interval
Blinks at 0.8Hz interval
Blinks at 0.8Hz interval
Blinks at 0.8Hz interval
1-2-1
IMPORTANT SAFETY PRECAUTIONS
Product Safety Notice
Some electrical and mechanical parts have special
safety-related characteristics which are often not evident 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 whenever
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 important to implement the following precautions when a set
is being serviced.
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 blocking 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 soldering.
F. Observe that the wires do not contact heat produc-
ing parts (heatsinks, oxide metal film resistors, fusible 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. Use care that foreign objects (screws, solder drop-
lets, etc.) do not remain inside the set.
K. Crimp type wire connector
The power transformer uses crimp type connectors
which connect the power cord and the primary side
of the transformer. When replacing the transformer,
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 con-
nectors, first, disconnect the AC plug from the AC
outlet.
1-3-1
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 confirm
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 soldered terminals, and between terminals and surrounding metallic parts. (See Fig. 1)
Table 1 : Ratings for selected area
AC Line Voltage Clearance Distance (d) (d’)
220 to 240 V
Note: This table is unofficial and for reference only.
Be sure to confirm the precise values.
≥ 3mm(d)
≥ 6 mm(d’)
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 terminals, 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. 2 and the following table.
Chassis or Secondary Conductor
Primary Circuit Terminals
dd'
Exposed Accessible Part
Z
One side of
B
Power Cord Plug Prongs
AC Voltmeter
(High Impedance)
Fig. 1
Fig. 2
Table 2: Leakage current ratings for selected areas
AC Line Voltage Load Z Leakage Current (i)
2kΩ RES.
Connected in
parallel
220 to 240 V
50kΩ RES.
Connected in
parallel
Note: This table is unofficial and for reference only. Be sure to confirm the precise values.
1-3-2
i≤0.7mA AC Peak
i≤2mA DC
i≤0.7mA AC Peak
i≤2mA DC
One side of power cord plug
prongs (B) to:
Antenna terminals
A/V Input, Output
RF or
STANDARD NOTES FOR SERVICING
Circuit Board Indications
a. The output pin of the 3 pin Regulator ICs is indi-
cated as shown.
Top View
Out
b. For other ICs, pin 1 and every fifth pin are indicated
as shown.
Pin 1
c. The 1st pin of every male connector is indicated as
shown.
Input
In
Pin 1
Bottom View
5
10
How to Remove / Install Flat Pack-IC
1. Removal
With Hot-Air Flat Pack-IC Desoldering Machine:.
(1) Prepare the hot-air flat pack-IC desoldering
machine, then apply hot air to the Flat Pack-IC
(about 5 to 6 seconds). (Fig. S-1-1)
Fig. S-1-1
(2) Remove the flat pack-IC with tweezers while apply-
ing the hot air.
(3) Bottom of the flat pack-IC is fixed with glue to the
CBA; when removing entire flat pack-IC, first apply
soldering iron to center of the flat pack-IC and heat
up. Then remove (glue will be melted). (Fig. S-1-6)
(4) Release the flat pack-IC from the CBA using twee-
zers. (Fig. S-1-6)
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.
FFC Cable
Connector
CBA
* Be careful to avoid a short circuit.
Caution:
1. Do not supply hot air to the chip parts around the
flat pack-IC for over 6 seconds because damage
to the chip parts may occur. Put masking tape
around the flat pack-IC to protect other parts from
damage. (Fig. S-1-2)
2. The flat pack-IC on the CBA is affixed with glue, so
be careful not to break or damage the foil of each
pin or the solder lands under the IC when removing
it.
Hot-air
Flat Pack-IC
Desoldering
CBA
Masking
Tape
Tweezers
Machine
Flat Pack-IC
Fig. S-1-2
1-4-1
With Soldering Iron:
(1) Using desoldering braid, remove the solder from all
pins of the flat pack-IC. When you use solder flux
which is applied to all pins of the flat pack-IC, you
can remove it easily. (Fig. S-1-3)
Flat Pack-IC
Desoldering Braid
(4) Bottom of the flat pack-IC is fixed with glue to the
CBA; when removing entire flat pack-IC, first apply
soldering iron to center of the flat pack-IC and heat
up. Then remove (glue will be melted). (Fig. S-1-6)
(5) Release the flat pack-IC from the CBA using twee-
zers. (Fig. S-1-6)
Note:
When using a soldering iron, care must be taken
to ensure that the flat pack-IC is not being held by
glue. When the flat pack-IC is removed from the
CBA, handle it gently because it may be damaged
if force is applied.
Soldering Iron
Fig. S-1-3
(2) Lift each lead of the flat pack-IC upward one by
one, using a sharp pin or wire to which solder will
not adhere (iron wire). When heating the pins, use
a fine tip soldering iron or a hot air desoldering
machine. (Fig. S-1-4)
Sharp
Pin
Fine Tip
Soldering Iron
Fig. S-1-4
(3) Bottom of the flat pack-IC is fixed with glue to the
CBA; when removing entire flat pack-IC, first apply
soldering iron to center of the flat pack-IC and heat
up. Then remove (glue will be melted). (Fig. S-1-6)
(4) Release the flat pack-IC from the CBA using twee-
zers. (Fig. S-1-6)
With Iron Wire:
(1) Using desoldering braid, remove the solder from all
pins of the flat pack-IC. When you use solder flux
which is applied to all pins of the flat pack-IC, you
can remove it easily. (Fig. S-1-3)
(2) Affix the wire to a workbench or solid mounting
point, as shown in Fig. S-1-5.
(3) While heating the pins using a fine tip soldering
iron or hot air blower, pull up the wire as the solder
melts so as to lift the IC leads from the CBA contact
pads as shown in Fig. S-1-5
To Solid
Mounting Point
CBA
Tweezers
Hot Air Blower
or
Iron Wire
Soldering Iron
Fig. S-1-5
Fine Tip
Soldering Iron
Flat Pack-IC
Fig. S-1-6
1-4-2
2. Installation
(1) Using desoldering braid, remove the solder from
the foil of each pin of the flat pack-IC on the CBA
so you can install a replacement flat pack-IC more
easily.
(2) The “ I ” mark on the flat pack-IC indicates pin 1.
(See Fig. S-1-7.) Be sure this mark matches the 1
on the PCB when positioning for installation. Then
presolder the four corners of the flat pack-IC. (See
Fig. S-1-8.)
(3) Solder all pins of the flat pack-IC. Be sure that none
of the pins have solder bridges.
Example :
Pin 1 of the Flat Pack-IC
is indicated by a " " mark.
Fig. S-1-7
Instructions for Handling Semi-conductors
Electrostatic breakdown of the semi-conductors may
occur due to a potential difference caused by electrostatic charge during unpacking or repair work.
1. Ground for Human Body
Be sure to wear a grounding band (1MΩ) that is properly grounded to remove any static electricity that may
be charged on the body.
2. Ground for Workbench
Be sure to place a conductive sheet or copper plate
with proper grounding (1MΩ) on the workbench or
other surface, where the semi-conductors are to be
placed. Because the static electricity charge on clothing will not escape through the body grounding band,
be careful to avoid contacting semi-conductors with
your clothing.
< Incorrect >
CBA
Presolder
Flat Pack-IC
Fig. S-1-8
CBA
< Correct >
Grounding Band
1MΩ
CBA
1MΩ
Conductive Sheet or
Copper Plate
1-4-3
PREPARATION FOR SERVICING
How to Enter the Service Mode
About Optical Sensors
Caution:
An optical sensor system is used for the Tape Start
and End Sensors on this equipment. Carefully read
and follow the instructions below. Otherwise the unit
may operate erratically.
What to do for preparation
Insert a tape into the Deck Mechanism Assembly and
press the PLAY button. The tape will be loaded into
the Deck Mechanism Assembly. Make sure the power
is on, TP507 (SENSOR INHIBITION) to GND. This will
stop the function of Tape Start Sensor, Tape End Sensor and Reel Sensors. (If these TPs are connected
before plugging in the unit, the function of the sensors
will stay valid.) See Fig. 1.
Note: Because the Tape End Sensors are inactive, do
not run a tape all the way to the start or the end of the
tape to avoid tape damage.
About REC-Safety Switch
Caution:
The REC-Safety Switch is directly mounted on the
Main CBA. When the Deck Mechanism Assembly is
removed from the Main CBA for servicing, this switch
does not work automatically.
What to do for preparation
In order to record, press the Rec button while pushing
REC-SAFETY SW on the Main CBA. See Fig. 1.
Q503
SW506
Q504
TP507
S-INH
(REC-SAFETY SW)
Fig. 1
1-5-1
TROUBLESHOOTING
Video problem 1 (No recording Video)
RF INPUT
Check Video signal at pin
48 of IC301.
OK
Check Video signal at pin 65 of IC301 or pin 50 of IC501.
OK
Check Video signal at pin 52 of IC501 or pin 56 of IC301.
OK
Cleaning the Video Head. (See page 2-7-2.)
NG
Check Cylinder Assembly.
LINE INPUT (AV2)
Check Video signal at pin 52 of IC301.
OK
Check Video signal at pin 65 of IC301 or pin 50 of IC501.
OK
NG
Check TU701.
NG
NG
LINE INPUT (AV1)
Check Video signal at pin
50 of IC301.
OK
NG
Check IC301, X301, etc.
Check A/V cable.
Check IC301, X301, etc.
NG
Check A/V cable.
Check Video signal at pin 52 of IC501 or pin 56 of IC301.
OK
Cleaning the Video Head.(See page 2-7-2.)
Video problem 2 (No playback Video)
Check signal at pin 94 and pin 96(or pin 93) of IC301.
OK
Check Video signal at pin 65
of IC301 or pin 50 of IC501.
OK
Check Video signal at pin 52 of IC501 or pin 56 of IC301.
OK
Check Video signal at pin 61 or 63 of IC301.
OK
Check V-OUT jack or TU701.
NG
Check IC301, X301, etc.
NG
Check Cylinder Assembly.
NG
Cleaning the Video Head. (See page 2-7-2.)
OK
Check Cylinder Assembly.
1-6-1
Audio problem 1 (No recording Normal Audio)
RF-INPUT
Change for Audio-mode(MONO) by AUDIO-SELECT
KEY of Remote Controller.
OK
NGCheck SIF signal at pin 2
of CN701.
OK
Check Audio signal at pin 4 and 5 of CN701 or pin 51
and 53 of IC451.
OK
Check Audio signal at pin 6 of IC451 or pin 15 of IC301.
OK
Check Tape interchangeability alignment. (See page 2-6-2.)
NG
Cleaning the Audio Control Head. (See page 2-7-2.)
LINE INPUT (AV2)
Check Audio signal at pin 11(or 67) or pin 73(or 65) of IC451.
OK
Check Audio signal at pin 6 of IC451 or pin 15 of IC301.
OK
Check Tape interchangeability alignment. (See page 2-6-2.)
NG
Cleaning the Audio Control Head. (See page 2-7-2.)
Check TU701,
NICAM unit.
NG
NG
NG
LINE INPUT (AV1)
Check Audio signal at pin 7 or 69 of IC451.
OK
NG
Check IC451, IC301.
Check AC Head Assembly.
Check IC451, IC301.
Check AC Head Assembly.
Audio problem 2 (No playback Normal Audio)
(AV1) (AV2)
Check Audio signal at pin 5 of IC301. Check Audio signal at pin 5 of IC301.
NG
Check Tape interchangeability alignment.
NG
Check the AC Head
Assembly.
Check Audio signal at pin 11 of IC301 or pin 4 of IC451. Check Audio signal at pin 11 of IC301 or pin 4 of IC451.
OK
Check Audio signal at pin 78 and 80 or 2 of IC451. Check Audio signal at pin 75 and 76 of IC451.
OK
Check TU701 or A-OUT jack. Check A-OUT jack.
Cleaning the Audio Control
NG
Head. (See page 2-7-2.)
1-6-2
OKOK
NG
Check Tape interchangeability alignment. (See page 2-6-2.)
NG
Check the AC Head
Assembly.
OK
OK
Cleaning the Audio Control
NG
Head. (See page 2-7-2.)
Audio problem 3 (No recording Hi-Fi Audio)
RF-INPUT
Check SIF signal at pin 2
of CN701.
OK
Check Audio signal at pin 4
and 5 of CN701 or pin 51
and 53 of IC451.
OK
Check signal at pin 26 of IC451.
OK
Cleaning the Video Head. (See page 2-7-2.)
LINE INPUT (AV2)
Check Audio signal at pin 11(or 67) and 73(or 63) of
IC451.
OK
Check signal at pin 26 of IC451.
OK
Cleaning the Video Head. (See page 2-7-2.)
NG NG
Check TU701.
NG
Check NICAM until.
NG
NG
NG
NG
NG
LINE INPUT (AV1)
Check Audio signal at pin
7 and 69 of IC451.
OK
Check signal at pin 26 of IC451.
NG
Cleaning the Video Head.
Check IC451.
Check Cylinder Assembly.
Check A/V cable.
Check IC451.
Check Cylinder Assembly.
(See page 2-7-2.)
Check A/V cable.
OK
NG
Audio problem 4 (No playback Hi-Fi Audio)
(AV1) (AV2)
Check signal at pin 24 and 27 of IC451.
OK
Cleaning the Video Head.
Check Audio signal at pin
78 and 80 of IC451.
OK
Check TU701, A-OUT jack.
NG
Check IC451.
NG
NG
Check Cylinder Assembly.
Check Audio signal at pin
75 and 76 of IC451.
OK
NG
OK
Check IC451.
1-6-3
Power problem
It is highly recommended that a variable isolation
transformer which can monitor current be used.
(Alternatively a variable AC source which monitors current will do). Read directions below before
power is added!
2] Check for any defective parts while the secondary
rectifying diodes are disconnected (D011, D013 and
D014) perform a diode check in both forward and
reverse directions through a tester.
3] Remove the following components and check for
defects: snubber diode (D005), switching FET (Q001),
source resistor (R006), control transistor (Q002).
Repair method
CHECK
Connect unit to the isolation transformer and slowly increase the AC supply while monitoring the current, if it
draws too much current (Be ware fuse
is rated for 1.6 amps), then turn off
supply and do repair method #1.
NO
Check whether the primary rectifying
DC of the Switching power supply has
an output. (Reading should be about
168V.)
YES
With the primary DC working check
the secondary 5V.
YES
Are the 44V, 12V and 5V
higher than normal?
NO
Although the secondary 5V is working,
are any of the other voltages higher
than normal (44V and 12V)?
NO
There is no problem on the SW power
supply.
YES
NO
NO
YES
YES
#1
#2
#3
#4
#5
Repair method #1
(Power must be off)
Short circuit in the secondary side. check diode D014,
D011, D012, D013, switching FET (Q001), control
transistor (Q002), diode (D006), and resistor (R014)
replace as necessary.
Disconnect 44V diode (D011), 12V diode (D013), 5V
diode (D014). Check the load continuity of 44V line,
12V line and 5V line through a tester (resistance
range).
If the tester indicates a lower resistance value around
0 ohm, the line is short-circuited.
Before repairing the switching power supply, find out
the short-circuited area of such line and repair it.
If the tester does not indicate any low resistance value
(around 0 ohm), no load is short-circuited and there is
no problem.
Repair method #2
Check the fuse 1.6A (F001), primary rectifying diodes
(D001-D004) as possible problems. Remove the
above mentioned parts and check them. The circuit
which turns on switching FET (Q001) may be
regarded as a possible cause, even if the load at the
secondary side is shorted, it can't be detected
because switching FET (Q001) isn't operating. Perform check according to the step 1 and 2 of repair
method #1 and check the following parts:
(Remove the part from PCB)
Switching FET (Q001), source resistor (R006), gate
resistor (R008) and start resistor (R004 and R005).
Repair method #3
A circuit to turn on switching FET (Q001) may not work
and this may be regarded as a cause of trouble. Even
if the load at the secondary side is short-circuited, it
cannot be detected because switching FET (Q001)
does not turn on. Therefore, perform check according
to the steps 1] and 2] of the repair method #1 and execute the under-mentioned parts breakage check.
(Remove the part from PCB.)
switching FET (Q001), source resistor (R014), control
transistor (Q002), gate resistor (R005) and start resistor (R003, R004 and R028).
Repair method #4
The feedback circuit which is monitored by the output
of voltage may not work and this may be regarded as
a possible cause, remove control transistor Q002 and
check for defects. More over, a photo coupler (IC001)
and transistor (Q004) may be defective, replace any
defective parts with factory originals.
Repair method #5
If the output voltage of the secondary side is slightly
high, the line load may be in the "OPEN" state and this
may be regarded as a cause of trouble. If there is no
output voltage on the secondary side, the rectifying
diodes (D014), (D013) may be defective.
1-6-4
OPERATING CONTROLS AND FUNCTIONS
VT-MX210EUK
Front Panel
1. Cassette compar tment
2. E (REW) button
3. B (PLAY) button
4. D (F.FWD) button
5.
C/A (STOP/EJECT) button
6. k (PAUSE) button
7. REC button
8. CHANNEL (o/p) [TRACKING]
buttons
9. Indicator (See below)
10.y (STANDBY) button
11. PWR. (Power) indicator
12. TAPE IN indicator
13. REC indicator
14. (Timer) indicator
15. CLOCK indicator
Indicator
11
12
12435
PWR. REC
15
678910
13
14
Rear Panel
16
Remote Control
STANDBY
1
1
2
4
7
VIDEO Plus+
3
DISPLAY
4
MENU
5
EW
6
7
R
REC
8
2
5
8
0
PLAY
STOP
3
6
9
DAILY/WEEKLY
RESET
SPEED
EJECT
CHANNEL
SLOW
COUNTER
MEMORY
D
W
F. F
PAUSE/STILL
18
17
16
15
14
13
12
11
10
9
1817
AV2(DECODER) AV1(TV)
AERIAL
RF OUT
1920
1. STANDBY button
2. NUMBER buttons
3. VIDEO Plus+ button
4. MENU button
5. DISPLAY button
6. REW button
7. STOP button
8. REC button
9. PAUSE/STILL button
10. SPEED button
11. F.FWD button
12. PLAY button
13. COUNTER RESET button
14. COUNTER MEMORY button
15. SLOW button
16. DAILY/WEEKLY button
17. CHANNEL (o/p) buttons
18. EJECT button
16. Power cord
17. AV2 (DECODER) socket
18. AV1 (TV) socket
19. RF OUT socket
20. AERIAL socket
To insert the batteries:
Install two AA batteries
matching the polarity indicated inside the battery
compartment.
1-7-1
Front Panel
Indicator
11
12
Rear Panel
16
VT-FX240EUK
12435
PWR. REC
15
AV2(DECODER) AV1(TV)
1817
AUDIO
OUTPUT
678910
13
14
1. Cassette compar tment
2. E (REW) button
3. B (PLAY) button
4. D (F.FWD) button
5.
C/A (STOP/EJECT) button
6. k (PAUSE) button
7. REC button
8. CHANNEL (o/p) [TRACKING]
buttons
9. Indicator (See below)
10.y (STANDBY) button
11. PWR. (Power) indicator
12. TAPE IN indicator
13. REC indicator
14. (Timer) indicator
15. CLOCK indicator
16. Power cord
17. AV2 (DECODER) socket
18. AV1 (TV) socket
19. RF OUT socket
20. AERIAL socket
L
AERIAL
RF OUT
R
21. AUDIO OUTPUT L/R jacks
1-7-2
Remote Control
STANDBY
1
1
2
4
7
VIDEO Plus+
3
4
MENU
5
6
7
8
R
REC
QUICK-FIND
9
10
EW
AUDIO
SELECT
2
5
8
0
DISPLAY
STOP
TIME
SEARCH
PLAY
3
6
9
DAILY/WEEKLY
RESET
SPEED
INDEX
EJECT
CHANNEL
SLOW
COUNTER
MEMORY
D
W
F. F
PAUSE/STILL
22
21
20
19
18
17
16
15
14
13
12
11
192021
1. STANDBY button
2. NUMBER buttons
3. VIDEO Plus+ button
4. MENU button
5. DISPLAY button
6. REW button
7. STOP button
8. REC button
9. QUICK-FIND button
10. TIME SEARCH button
11. INDEX SEARCH button
12. PAUSE/STILL button
13. SPEED button
14. F.FWD button
15. PLAY button
16. COUNTER RESET button
17. COUNTER MEMORY button
18. SLOW button
19. DAILY/WEEKLY button
20. CHANNEL (o/p) buttons
21. EJECT button
22. AUDIO SELECT button
To insert the batteries:
Install two AA batteries
matching the polarity indicated inside the battery
compartment.
CAUTION
On Battery Replacement
• Do not mix old and new
batteries. (Also never mix alka-
line batteries with manganese
batteries.)
CHAPTER 2 DISASSEMBLY AND ADJUSTMENT
CABINET DISASSEMBLY INSTRUCTIONS
1. Disassembly Flowchart
This flowchart indicates the disassembly steps to gain
access to item(s) to be serviced. When reassembling,
follow the steps in reverse order. Bend, route, and
dress the cables as they were originally.
[1] Top Case
[2] Front Assembly
[3] VCR Chassis Unit
[4] Jack CBA
[5] Function CBA
[6] Deck Assembly
[7] Main CBA
2. Disassembly Method
REMOVAL
ID/
LOC.
No.
PART
REMOVE/*UNHOOK/
Fig.
UNLOCK/RELEASE/
No.
UNPLUG/DESOLDER
Note
(1): Identification (location) No. of parts in the figures
(2): Name of the part
(3): Figure Number for reference
(4): Identification of parts to be removed, unhooked,
unlocked, released, unplugged, unclamped, or
desoldered.
P=Spring, L=Locking Tab, S=Screw,
CN=Connector
*=Unhook, Unlock, Release, Unplug, or Desolder
e.g. 2(S-2) = two Screws (S-2),
2(L-2) = two Locking Tabs (L-2)
(5): Refer to “Reference Notes.”
Reference Notes
CAUTION: Locking Tabs (L-1) and (L-2) are fragile.
Be careful not to break them.
1. Release Locking Tab (L-3) and remove Screw
(S-2), five Screws (S-3), three Screws (S-4) and
Screw (S-5). Then, slowly lift the VCR Chassis Unit
(Deck Assembly, Function CBA, Jack CBA and
Main CBA) up.
2. When reassembling, solder wire jumpers as shown
in Fig. 5.
3. Before installing the Deck Assembly, be sure to
place the pin of LD-SW on Main CBA as shown in
Fig. 6. Then, install the Deck Assembly while aligning the hole of Cam Gear with the pin of LD-SW,
the shaft of Cam Gear with the hole of LD-SW as
shown in Fig. 6.
[1] Top Case 1 7(S-1) -
Front
[2]
Assembly
VCR
[3]
Chassis
Unit
[4] Jack CBA 4 Desolder, (S-6) -
Function
[5]
CBA
Deck
[6]
Assembly
[7] Main CBA 5 ---------- -
↓
(1)
↓
(2)
2 *3(L-1),*4(L-2) -
*(L-3), (S-2), 5(S-3),
3
3(S-4), (S-5)
5 Desolder -
5,6 2(S-7), Desolder 2,3
↓
(3)
↓
(4)
1
↓
(5)
2-1-1
(S-1)
[1] Top Case
(S-1)
(S-1)
Fig. 1
(S-3)
[3]VCR
Chassis Unit
(S-2)
(S-4)
(S-3)
(S-5)
(S-4)
(S-3)
(L-2)
[2] Front
Assembly
(L-1)
(L-3)
(L-2)
Fig. 3
[4] Jack CBA
(S-6)
Desolder
Fig. 2
Fig. 4
2-1-2
FE Head
Cylinder Assembly
AC Head
Assembly
Pin
SW507
LD-SW
[6] Deck Assembly
(S-7)
[5] Function
CBA
From
FE Head
Lead with
red stripe
From
Cylinder
Assembly
Lead with
white stripe
From
AC Head
Assembly
[7] Main CBA
Desolder
From
Capstan Motor
Assembly
Lead with
white stripe
(S-7)
[7] Main CBA
[6] Deck Assembly
Shaft
Hole
LD-SW
Cam Gear
Hole
Pin
[7] Main CBA
Fig. 6
TOP VIEW
Lead connections of Deck Assembly and Main CBA
Fig. 5
2-1-3
DISASSEMBLY/ASSEMBLY PROCEDURES
OF DECK MECHANISM
Before following the procedures described below, be sure to remove the deck assembly from the cabinet. (Refer to
CABINET DISASSEMBLY INSTRUCTIONS on page 2-1-1.)
All the following procedures, including those for adjustment and replacement of parts, should be done in Eject
mode; see the positions of [41] and [42] in Fig.DM1 on page 2-2-3. When reassembling, follow the steps in reverse
order.
STEP
/LOC.
START-
ING
No.
[1] [1]
[2] [1]
[3] [2] Slider L T DM5 (S-2)
[4] [2] Slider R T DM5 (S-3)
[5] [4]
[6] [2]
[7] [7] Cylinder Assembly T DM1,DM6 Desolder, 3(S-5)
[8] [8] Loading Motor Assembly T DM1,DM7
[9] [9]
[10] [2]
[11] [10]
[12] [11] Pinch Arm (B) T DM1,DM8 *(P-3)
[13] [12]
[14] [14]
[15] [15]
[16] [2] Slider Shaft T DM10 (S-11),*(L-3)
[17] [16]
[18] [16]
[19] [7],[10]
[20] [20] Clutch Assembly(HI) B DM2,DM12 (C-1)
[21] [20]
[22] [22]
[23] [22]
[24] [24] Mode Gear B DM2,DM14 (C-4)
[25]
[26] [22] Worm Holder B DM2,DM14 (S-15)
[27] [26] Pulley Assembly B DM2,DM14
[28] [22],[25]
[29] [20]
[30] [29] TR Gear Spring B DM14
[31] [30] TR Gear A/B B DM1,DM14
[32] [31]
[33] [21],[25]
[34] [25] BT Arm B DM2,DM15 *(P-5)
No.
[20],[23],
[24]
Guide Holder A T DM3 2(S-1)
Cassette Holder Assembly T DM4
Lock Lever T DM5 (S-4),*(P-1)
C Plate T DM5
AC Head Assembly T DM1,DM7 (S-7)
Tape Guide Assembly T DM1,DM8 *(P-2)
Door Opener B T DM1,DM8 *(L-1),*(L-2)
Pinch Arm (A) Assembly T DM1,DM8
FE Head T DM1,DM9 (S-9)
Prism T DM1,DM9 (S-10)
C Drive Lever L T DM10
C Drive Lever R T DM10
Capstan Motor B DM2,DM11 3(S-12), Cap Belt
Center Gear B DM12
Cam Holder F B DM2,DM13 (C-2)
Cam Gear (B) B DM2,DM13 (C-3),*(P-4)
Mode Lever(HI) B DM2,DM14 (C-5), *(L-4)
Cam Gear (A) B DM2,DM14
TR Gear C B DM2,DM14 (C-6)
FF Arm(HI) B DM1,DM14
Idler Assembly(HI) B DM1,DM15 *(L-5)
PART
Fig. No.
REMOVAL INSTALLATION
REMOVE/*UNHOOK/
UNLOCK/RELEASE/
UNPLUG/DESOLDER
Desolder, LDG Belt,
2(S-6)
ADJUSTMENT
CONDITION
(+)Refer to Alignment
Sec.Pg.2-3-2
2-2-1
STEP
/LOC.
START-
ING
No.
[35] [25]
[36] [35]
[37] [2],[25]
[38] [2],[25] M Brake S(HI) Assembly T DM1,DM16 *(P-7)
[39] [38]
[40] [39]
[41] [2]
[42] [2],[15] Sensor Gear T DM1,DM16 (C-8)
[43] [37],[41] Reel T T DM1,DM16
[44] [39]
[45] [35],[38]
[46] [36]
[47] [19] TG Post Assembly T DM1,DM17 *(L-7)
[48] [18],[28]
[49] [48]
[50] [50] Cleaner Lever Assembly T DM1,DM6
[51] [50] CL Post T DM6 *(L-9) Type A
↓
(1)
No.
Loading Arm S(B)
Assembly
Loading Arm T(B)
Assembly
M Brake T(HI) Assembly T DM1,DM16 *(P-6)
Tension Lever Sub
Assembly
T Lever Holder T DM1,DM16 *(L-6)
M Gear(HYT) T DM1,DM16 (C-7)
Reel S T DM1,DM16
Moving Guide S
Preparation
Moving Guide T
Preparation
Rack Assembly R DM18
F Door Opener R DM18
↓
(2)
PART
↓
(3)
Fig. No.
B DM2,DM15
B DM2,DM15
T DM1,DM16
T DM1,DM17
T DM1,DM17
↓
(4)
↓
(5)
REMOVAL INSTALLATION
REMOVE/*UNHOOK/
UNLOCK/RELEASE/
UNPLUG/DESOLDER
(+)Refer to Alignment
Sec.Pg.2-3-1
(+)Refer to Alignment
Sec.Pg.2-3-1
(+)Refer to Alignment
Sec.Pg.2-3-2
Type A
*(L-8) Type B
↓
(6)
ADJUSTMENT
CONDITION
↓
(7)
(1): Follow steps in sequence. When reassembling, follow the steps in reverse order.
These numbers are also used as ldentification (location) No. of parts in the figures.
(2): Indicates the part to start disassembling with in order to disassemble the part in column (1).
(3): Name of the part
(4): Location of the part: T=Top B=Bottom R=Right L=Left
(5): Figure Number
(6): Identification of parts to be removed, unhooked, unlocked, released, unplugged, unclamped, or desoldered.
P=Spring, W=Washer, C=Cut Washer, S=Screw, *=Unhook, Unlock, Release, Unplug, or Desolder
e.g., 2(L-2) = two Locking Tabs (L-2).
(7): Adjustment Information for Installation
(+):Refer to Deck Exploded Views for lubrication.
.
* In case of some models, the Cleaner Lever Assembly and CL Post is not used.
2-2-2
Top View
[14]
[39]
[7] [50] [8]
[46][45] [47][9]
[13]
[11]
[15]
[40]
[38]
Bottom View
[10]
[12]
[37]
[33][44] [42] [31] [32] [41] [43]
Fig. DM1
[19]
[36]
[35]
2-2-3
[26]
[27]
[23]
[28]
[24]
[25]
[34][20][29][22]
Fig. DM2
(S-1)
[1]
(S-1)
Fig. DM3
[3]
[4]
[5]
(S-2)
[6]
(P-1)
(S-3)
(S-4)
Fig. DM5
Note: Either of two types (A and B) of CLEANER
ASSEMBLY is applied for the Deck Assembly. Though
these structures are different, they are compatible.
Pin D
Pin C
Slots B
First, while pushing the locking tab as
shown in the right, slide and pull up the right
side on [2] to release Pin A and Pin B from
the slots A.
Then, remove Pin C and Pin D on [2] from
the slots B as shown.
[2]
Pin A
2
Pull up
A
1
Slide
Pin B
Slot A
Slot A
[7]
Type A
(S-5)
[50]
[51]
(L-9)
Type B
[50]
(L-8)
A
Locking tab
View for A
Fig. DM4
Desolder
from bottom
View for A
Lead with
Blue Stripe
Fig. DM6
2-2-4
[9]
A
(S-7)
(S-6)
(L-2)
LDG
Belt
Adj. Screw
[8]
Desolder
from bottom
Lead with White Stripe
View for A
[8]
Fig. DM7
[11]
(L-1)
[14]
[17]
(L-3)
(S-9)
(S-10)
[15]
Fig. DM9
After removing the Screw (S-11),
while pressing the Locking Tab
(L-3), remove [16].
Pin of [12]
Pin of [10]
[13]
[10]
A
Grooves of [28]
(P-3)
[12]
[16]
[18]
(P-2)
(S-11)
Fig. DM10
2-2-5
View for A
When reassembling [10] and
[12], confirm that pin of [10]
and pin of [12] are in the
[28]
grooves of [28] as shown.
Fig. DM8
Cap Belt
(C-1)
[20]
[19]
[21]
Fig. DM12
(S-12)
Fig. DM11
2-2-6
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