Hitachi VTFX340EUK User manual

SERVICE MANUAL
VIDEO CASSETTE RECORDER
No. 5302
VTFX340EUK
VTMX310EUK
May 2003 Digital Media Division
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

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 How to Remove/Install Flat Pack-IC . . . . . . . . . . 1-3
1-2-4 Instructions for Handling Semi-conductors . . . . . 1-5
2 GENERAL INFORMATION. . . . . . . . . . . . . . . . .2-1
2-1 SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2-2 COMPARISON OF MODELS . . . . . . . . . . . . . . . . . 2-2
2-2-1 Comparison of Features . . . . . . . . . . . . . . . . . . . 2-2
2-2-2 Comparison of Main Control ICs . . . . . . . . . . . . . 2-2
2-3 FUNCTION INDICATOR SYMBOLS . . . . . . . . . . . . 2-4
2-4 OPERATING CONTROLS AND FUNCTIONS . . . . 2-5
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 . . . . . . . . . . . . . . . . . . . . . 4-6
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. . . . . . . . . . . . . . . . . . . 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. . . . . . . . . . . . . . . . . . 5-7
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 . . . . . . . . . . . . . . . . . . . . . . . .6-7
SCHEMATIC, CIRCUIT BOARD AND BLOCK
DIAGRAMS
1 SCHEMATIC DIAGRAMS/CBA’S AND TEST POINTS . 1
2 WIRING DIAGRAMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3 SCHEMATIC DIAGRAMS. . . . . . . . . . . . . . . . . . . . . . . . 4
3-1 Main 1/7 Schematic Diagram. . . . . . . . . . . . . . . . . . . . 4
3-2 Main 2/7 & Sensor Schematic Diagrams. . . . . . . . . . . 5
3-3 Main 3/7 Schematic Diagram. . . . . . . . . . . . . . . . . . . . 6
3-4 Main 4/7 & Jack Schematic Diagram. . . . . . . . . . . . . . 7
3-5 Main 5/7 Schematic Diagram. . . . . . . . . . . . . . . . . . . . 8
3-6 Main 6/7 Schematic Diagram ( VT-FX340E(UK) ). . . . 9
3-7 Main 7/7 Schematic Diagram. . . . . . . . . . . . . . . . . . . 10
3-8 AFV Schematic Diagram ( VT-FX340E(UK) ) . . . . . . 11
4 WAVEFORMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5 CIRCUIT BOARD DIAGRAMS . . . . . . . . . . . . . . . . . . . 13
5-1 Main CBA Top View. . . . . . . . . . . . . . . . . . . . . . . . . . 13
5-2 Main CBA Bottom View . . . . . . . . . . . . . . . . . . . . . . . 14
5-3 Jack CBA Top / Bottom View. . . . . . . . . . . . . . . . . . . 15
5-4 AFV CBA Top / Bottom View ( VT-FX340E(UK) ) . . . 16
6 BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6-1 Servo/System Control Block Diagram . . . . . . . . . . . . 17
6-2 Video Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . 18
6-3 Audio Block Diagram (VT-MX310E(UK)). . . . . . . . . . 19
6-4 Audio Block Diagram (VT-FX340E(UK)) . . . . . . . . . . 20
6-5 Hi-Fi Audio Block Diagram (VT-FX340E(UK)). . . . . . 21
6-6 Power Supply Block Diagram . . . . . . . . . . . . . . . . . . 22
7 SYSTEM CONTROL TIMING CHARTS . . . . . . . . . . . . 23
8 IC PIN FUNCTION DESCRIPTIONS . . . . . . . . . . . . . . 30
9 LEAD IDENTIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . 33

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 contin-
uously 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 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 connectors
which connect the power cord and the primary side
of the transformer. When replacing the transformer,
follow these steps carefully and precisely to pre-
vent 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 clo-
sure of the tool.
L. When connecting or disconnecting the internal con-
nectors, first, disconnect the AC plug from the AC
outlet.
CAUTIONS FOR SAFETY IN PERFORMING REPAIR 1

1-2
AC Voltmeter
(High Impedance)
Exposed Accessible Part
BOne side of
Power Cord Plug Prongs
Z
Chassis or Secondary Conductor
dd'
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 posi-
tions. 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 sol-
dered terminals, and between terminals and surround-
ing 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’)
230 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:
230 V
2kΩ RES.
Connected in parallel i≤0.7mA AC Peak i≤2mA DC RF or Antenna terminals
50kΩ RES.
Connected in parallel i≤0.7mA AC Peak i≤2mA DC A/V Input, Output
Fig. 1-1-1
Fig. 1-1-2

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 indicated
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 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. 1-2-1)
(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. 1-2-6)
(4) Release the flat pack-IC from the CBA using twee-
zers. (Fig. 1-2-6)
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. 1-2-2)
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.
Top View
Out In
Bottom View
Input
5
10
Pin 1
Pin 1
FFC Cable
Connector
CBA
* Be careful to avoid a short circuit.
Fig. 1-2-1
Hot-air
Flat Pack-IC
Desoldering
Machine
CBA
Flat Pack-IC
Tweezers
Masking
Tape
Fig. 1-2-2

1-4
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. 1-2-3)
(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. 1-2-4)
(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. 1-2-6)
(4)Release the flat pack-IC from the CBA using twee-
zers. (Fig. 1-2-6)
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. 1-2-3)
(2)Affix the wire to a workbench or solid mounting
point, as shown in Fig. 1-2-5.
(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. 1-2-5.
(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. 1-2-6)
(5) Release the flat pack-IC from the CBA using twee-
zers. (Fig. 1-2-6)
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.
Flat Pack-IC Desoldering Braid
Soldering Iron
Fig. 1-2-3
Fine Tip
Soldering Iron
Sharp
Pin
Fig. 1-2-4
To Solid
Mounting Point
Soldering Iron
Iron Wire
or
Hot Air Blower
Fig. 1-2-5
Fine Tip
Soldering Iron
CBA
Flat Pack-IC
Tweezers
Fig. 1-2-6

1-5
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. 1-2-7.) 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. 1-2-8.)
(3)Solder all pins of the flat pack-IC. Be sure that none
of the pins have solder bridges.
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 (1MΩ) 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 (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 ground-
ing band, be careful to avoid contacting semi-con-
ductors with your clothing.
Example :
Pin 1 of the Flat Pack-IC
is indicated by a " " mark. Fig. 1-2-7
Presolder
CBA
Flat Pack-IC
Fig. 1-2-8
CBA
< Incorrect >
CBA
Grounding Band
Conductive Sheet or
Copper Plate
1MΩ
1MΩ
< Correct >

2-1
Video output level : 1Vp-p
Video output impedance : 75Ωunbalanced
Audio output level : -6dBV
Video input level : 0.5 ~2.0Vp-p
Audio input level : -10dBV
Video S/N ratio
(STANDARD): 45dB
Audio S/N ratio
(STANDARD): 41dB
Power requirement : 220-240V 50Hz
Power consumption : 20 Watts (Stand by:3.3 watts)
Dimensions : W 360mm
H 92mm
D 226mm
Weight : 2.6 Kg. (approx.)
General Specifications Electrical Specifications
Other Specifications
Television system: PAL I
TV standard
Video heads Six comprising of Four-video
and Two-audio heads
Helical scan system
Tape width : 12.65mm
Tape speed
SP : 23.39mm/s
LP : 11.70mm/s
Tuner channel IRA~IRJ
E21~E69
CATV
RF converter : Built-in UHF converter
Converter output : UHF Channel 22 to 69
(adjustable)
Timer indication : 24-hour system
Operating temperature : 5ºC ~ 40ºC
Terminals
AERIAL : Coaxial type, male
RF OUT : Coaxial type, female
AUDIO/VIDEO : 21 pin scart socket x 2
Video output level : 1Vp-p
Video output impedance : 75Ωunbalanced
Audio output level : -6dBV
Video input level : 0.5 ~2.0Vp-p
Audio input level : -10dBV
Video S/N ratio
(STANDARD): 45dB
Audio S/N ratio
(STANDARD): 41dB
Power requirement : 220-240V ~ 50Hz
Power consumption : 20 Watts (Stand by: 3.3 watts)
Dimensions : W 360mm
H 92mm
D 226mm
Weight : 2.6 Kg. (approx.)
Television system: PAL I
TV standard
Video heads Rotary two-head
helical scan system
Tape width : 12.65mm
Tape speed
SP : 23.39mm/s
LP : 11.70mm/s
Tuner channel IRA~IRJ
E21~E69
CATV
RF converter : Built-in UHF converter
Converter output : UHF Channel 22 to 69
(adjustable)
Timer indication : 24-hour system
Operating temperature : 5ºC ~ 40ºC
Terminals
AERIAL : Coaxial type, male
RF OUT : Coaxial type, female
AUDIO/VIDEO : 21 pin scart socket x 2
General Specifications Electrical Specifications
Other Specifications
2-1 SPECIFICATIONS
[ VT-FX340E(UK) ]
[ VT-MX310E(UK) ]
GENERAL INFORMATION 2

2-2
2-2 COMPARISON OF MODELS
2-2-1 Comparison of Features ←: Same as on left
ITEM VT-FX340E(UK)/MX310E(UK) VT-FX240EUK/MX210EUK
Cabinet Size 360(W) x 92(H) x 226(D) mm ←
Weight 2.6 kg ←
Power Consumption 20 W ←
Video Format VHS ←
Y/C Separation Comb Filter ←
YNR (Luminance Noise Reduction)
Circuit O←
New Synchronise Circuit --- ←
Picture Control O ←
Video/Audio Input (Rear) 2/2 (AV1/AV2) ←
Video/Audio Input (Front) --- ←
Video/Audio Output (Rear) 2/2 (AV1/AV2) ←
Remote Controller VT-RM340E [VT-FX340E(UK)]
VT-RM310E [VT-MX310E(UK)] VT-RM240E [VT-FX240EUK] VT-RM210E [VT-MX210EUK]
Stereo CM Skip Feature --- ←
Auto Clock Feature O ←
Number of Timer Programming 8 Program/year ←
Self Diagnosis Funtion O (4 Modes) ←
Back-up Time 60 s ←
SQPB --- ←
Surge Absorber --- ←
Auto Power Off Feature O ←
Local Broadcast Setting O ←
Multi Search Feature O (Index, Time Search, Quick Find) ←
Search Speed SP: X5/X7
LP: X5/X11 ←
FF/REW Time (T-120 Tape)
FF: approx. 100 s, REW: approx. 100 s ←
Head Composition
[VT-FX340E(UK)] / [VT-FX240EUK]
DA4+Hi-Fi
SP: 2[49/49 µm]
LP: 2[25/25 µm]
Hi-Fi Audio: 2[28/28 µm]
←
Head Composition
[VT-MX310E(UK)] / [VT-MX210EUK] DA2 28/28 µm←
Head Material
[VT-FX340E(UK)] / [VT-FX240EUK] SP: Ferrite
LP: Ferrite
Hi-Fi Audio: Ferrite ←
Head Material
[VT-MX310E(UK)] / [VT-MX210EUK] SP: Ferrite LP: Ferrite ←
VISS O (Index Search) ←
PULSE
Flame by Flame Mode [VT-FX340E(UK)]
Tracking Mode [VT-MX310E(UK)]
Flame by Flame Mode [VT-FX240EUK]
Tracking Mode [VT-MX210EUK]
APPEARANCE
VIDEO
INPUT/
OUTPUT
OTHERMECHANISM

2-3
2-2-2 Comparison of Main Control ICs ←: Same as on left
ITEM OPERATION VT-FX340E(UK)/MX310E(UK) VT-FX240EUK/MX210EUK
Video Video Signal Process LA71750AM-MTB(IC301) ←
Audio FM Audio Signal Process LA72648M(IC451)
[VT-FX340E(UK)] LA72646M-A-MPB(IC451) [VT-FX240EUK]
Linear Audio Signal Process Included in IC301 ←
System Control
Main Microcomputer µP M37762MCA-AC8GP(IC501) M37762MCA-1C1GP(IC501)
VCR-EEP ROM BR24C02F-W(IC503) ←
Reset - -
Loading Motor Drive - -
Cylinder/Loading Motor Control - -
Power Reset - -
VPS LC74793JM-TRM(IC640) -
Audio Output Selector TC4052BF(EL)(IC151)
[VT-MX310E(UK)] TC4052BF(EL)(IC151) [VT-MX210EUK]
Timer Display Driver PT6958-FN-TP(IC571) ←
Power Switching Driver - -

2-4
2-3 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
" H "= LED Light on, " L "= LED Light off
LED MODE INDICATOR ACTIVE
CASSETTE "IN"
CASSETTE "OUT" " "
" " ON
OFF
CLOCK " 88:88 ON
POWER ON " PWR." ON
REC " REC " ON
REC PAUSE " REC " Blinks at 0.8Hz interval
T-REC,OTR " " ON
(T-REC OFF,T-REC incomplete
Blinks at 0.8Hz interval)
When reel and capstan mechanism is not
functioning correctly " "
" 1 " Blinks at 0.8Hz interval
When tape loading mechanism is not func-
tioning correctly " "
" 2 " Blinks at 0.8Hz interval
When cassette loading mechanism is not
functioning correctly " "
" 3 " Blinks at 0.8Hz interval
When the drum is not working properly " "
" 4 " Blinks at 0.8Hz interval
P-ON Power safety detection " "
" 5 " Blinks at 0.8Hz interval
S-INH condition All modes Blinks at 0.8Hz interval

2-5
PROGRAM
TRACKING
247
1
35689
1. Cassette compartment
2. D(F.FWD) button
3. B(PLAY) button
4. E(REW) button
5. CA(STOP/EJECT) button
6. I(REC) button
7. Indicator (See below)
8. PROGRAM (o/p) [TRACKING]
buttons
9.y(OPERATE) button
10. PWR. (Power) indicator
11. TAPE IN indicator
12. REC indicator
13. (Timer) indicator
14. CLOCK indicator
PWR. REC
10
11
14
12
13
15.Power cord
16.AV2 (DECODER) socket
17.AV1 (TV) socket
18.RF OUT socket
19.AERIAL socket
Indicator
Rear Panel
RF OUT
AERIAL
AV2(DECODER) AV1(TV)
1716
1819
15
Front Panel
SEARCH
TIME
SLOW
SPEED
PROGRAM
PAUSE/STILL
QUICK-FIND
REC
INDEX
DISPLAY
MENU
COUNTER
RESET MEMORY
OPERATE
EJECT
0
REW
STOP
PLAY
F.FWD
789
6
5
4
3
2
1
AUDIO
SELECT
VIDEO Plus+ DAILY/WEEKLY
1
220
21
22
4
3
6
8
7
9
17
18
14
13
19
15
12
11
16
5
10
1. OPERATE button
2. NUMBER buttons
3. VIDEO Plus+ button
4. MENU button
5. DISPLAY button
6. REW/sbutton
7. STOP/L
L
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/Bbutton
15.PLAY/o
o
button
16.COUNTER RESET button
17.COUNTER MEMORY button
18.SLOW button
19.DAILY/WEEKLY button
20.PROGRAM (o/p) buttons
21.EJECT button
22.AUDIO SELECT button
Remote Control
2-4 OPERATING CONTROLS AND FUNCTIONS
[ VT-FX340E(UK) ]

2-6
PROGRAM
TRACKING
247
1
35689
1. Cassette compartment
2. D(F.FWD) button
3. B(PLAY) button
4. E(REW) button
5.
CA(STOP/EJECT) button
6. I( REC) button
7. Indicator (See below)
8. PROGRAM (o/p) [TRACKING]
buttons
9.y(OPERATE) button
10. PWR. (Power) indicator
11. TAPE IN indicator
12. REC indicator
13. (Timer) indicator
14. CLOCK indicator
PWR. REC
10
11
14
12
13
15.Power cord
16.AV2 (DECODER) socket
17.AV1 (TV) socket
18.RF OUT socket
19.AERIAL socket
Indicator
Rear Panel
Remote Control
RF OUT
AERIAL
AV2(DECODER) AV1(TV)
1716
1819
15
Front Panel
SPEED
PROGRAM
PAUSE/STILL
REC
DISPLAY
MENU
COUNTER
RESET MEMORY
OPERATE
EJECT
0
REW
STOP
PLAY
F.FWD
789
6
5
4
3
2
1
VIDEO Plus+ DAILY/WEEKLY
1
216
17
4
3
6
8
7
14
11
10
15
12
9
13
5
1. OPERATE button
2. NUMBER buttons
3. VIDEO Plus+ button
4. MENU button
5. DISPLAY button
6. REW/sbutton
7. STOP/L
L
button
8. REC button
9. PAUSE/STILL button
10.SPEED button
11. F.FWD/Bbutton
12.PLAY/o
o
button
13.COUNTER RESET button
14.COUNTER MEMORY button
15.DAILY/WEEKLY button
16.PROGRAM (o/p) buttons
17.EJECT button
[ VT-MX310E(UK) ]

3-1
RF INPUT
NG
OK
OK
CheckVideo signal at pin 48 of IC301.
CheckVideo signal at pin 50 of IC501.
CheckTU701 and line between
TU701 and pin 48 of IC301, and
service it if detective.
LINE INPUT (AV1)
CheckVideo signal at pin 50 of IC301.
Check A/V cable, JK101 and line
between JK101 and pin 50 of IC301, and
service it if detective.
LINE INPUT (AV2)
OK
NG
Check IC501 and line between pin
52 of IC501 and pin 56 of IC301, and
service it if detective.
Check IC501 and line between pin 52 of IC501 and pin
56 of IC301, and service it if detective.
NG
NG
OK
Cleaning the Video Head.(See page 3-7.) Or check Cylinder Assembly and service it if detective.
CheckVideo signal at pin 56 of IC301. Check IC301, X301 and line between pin 65 of IC301
and pin 50 of IC501, and service it if detective.
Video problem 1 (No recordingVideo)
NG
OK
CheckVideo signal at pin 52 of IC301.
Check AV cable, JK102 and line between JK102 and pin 52
of IC301,
and service it if detective.
NG
OK
CheckVideo signal at pin 50 of IC501.
OK
CheckVideo signal at pin 56 of IC301.
Cleaning the Video Head.(See page 3-7.)
Or check Cylinder Assembly and service it if detective.
Check IC301, X301 and
line between pin 52 of IC301 and
pin 50 of IC501
, and service it if detective.
NG
MAINTENANCE AND INSPECTION 3
3-1 TROUBLESHOOTING
Troubleshooting is how to service for the specifying malfunction or poor parts.
Detect malfunction or poor parts and service as the following charts.

3-2
OK
OK OK OK
Check signal at pin 93 and pin 96 (or pin 87, pin 90) of IC301.
OK
OK Check IC501 and line between pin 52 of IC501 and pin
56 of IC301, and service it if detective.
Check IC301, X301 and line between pin
65 of IC301 and pin 50 of IC501, and
service it if detective.
NG
Cleaning the Video Head.(See page 3-7.) Or check
Cylinder Assembly and service it if detective.
NG
CheckVideo signal at pin 50 of IC501.
CheckVideo signal at pin 56 of IC301.
NG NG
Check line between pin 52 of IC501
and pin 6 of TU701, and service it if
detective.
CheckTU701 and service
it if detective.
Check line between pin 61 of IC301
and pin 19 of JK101, and service it if
detective.
Check JK101 and AV cable,
and service it if detective.
Check line between pin 63 of IC301
and pin 19 of JK102, and service it if
detective.
Check JK102 and AV cable,
and service it if detective.
CheckVideo signal at pin 6 of TU701.
CheckVideo signal at pin 19 of JK101. CheckVideo signal at pin 19 of JK102.
RF OUT LINE OUT (AV1) LINE OUT (AV2)
Video problem 2 (No playback Video)
NG

3-3
Check Audio signal at pin 5 of IC301.
Check ACE Head Assembly and service it if detective.
(RF OUTPUT/AV1) (AV2)
NG
Check Audio signal at pin 11 of IC301 or pin 80 of IC451.
Check IC451
and service
it if detective.
Check Audio signal at pin
(72, 74, 76) of IC451.
Check IC301 and IC451 ,
and service it if detective.
Check TU701 or
A-OUT jack, and
service it if detective.
OK(with VT-MX310E(UK))
OK
Audio problem 2 (No playback Normal Audio)
Check Tape interchangeability
alignment. (See page 5-5.) Cleaning the Audio
Control Head.
(See page 3-7.)
NG
NG
NG
OK(with VT-MX310E(UK))
OK
Check Audio signal at pin 5 of IC301.
Check ACE Head Assembly and service it if detective.
NG
Check Audio signal at pin 11 of IC301 or pin 80 of IC451.
Check IC451
and service
it if detective.
Check Audio signal at pin
65 and pin 67 of IC451.
Check IC301 and IC451 ,
and service it if detective.
Check A-OUT jack and
service it if detective.
OK(with VT-MX310E(UK))
OK
NG
NG
NG
OK(with VT-MX310E(UK))
OK
RF-INPUT
OK
Change for Audio-mode(MONO) by AUDIO-
SELECT KEY of Remote Controller.
LINE INPUT (AV1)
Check Audio signal at pin 6 or 52 of IC451.
Check Audio signal at pin 4 and 5 of CN701
or pin 4 and 50 of IC451.
LINE INPUT (AV2)
OK
OK
OK
OK
Check Audio signal at pin 17 of IC301.
OK
OK
OK
CheckTape interchangeability alignment. (See page 5-5.)
Cleaning the Audio Control Head. (See page 3-7.)
NG
Check ACE Head Assembly and service it if detective.
Check SIF signal at pin 2 of CN701. Check TU701 and
service it if detective.
NG
Check AV cable, JK101 and
line between JK101 and pin
(6, 52) of IC451, and service
it if detective.
(with VT-FX340E(UK))
(with VT-MX310E(UK))
(with VT-FX340E(UK))
(with VT-MX310E(UK))
Check AFV CBA and
service it if detective.
NG
Check Audio signal at pin 13, pin 15 or pin 17 of IC301.
Check IC451 and IC301, and service it if detective.
Check IC451 and IC301, and service it if detective.
Audio problem 1 (No recording Normal Audio)
Check Audio signal at pin 10 or pin 56 of IC451.
NG
Check AV cable, JK102 and line between JK102 and pin
(10, 56) of IC451, and service it if detective.
NG
Check ACE Head Assembly and service it if detective.
NG
(with VT-FX340E(UK))
(with VT-MX310E(UK))
OK
Cleaning the Audio Control Head. (See page 3-7.)
CheckTape interchangeability alignment. (See page 5-5.)
NG
NG
OK Check Tape interchangeability
alignment. (See page 5-5.) Cleaning the Audio
Control Head.
(See page 3-7.)
OK

3-4
Check signal at pin 24 and 27 of IC451.
Check Audio signal at pin
74 and pin 76 of IC451.
Cleaning the Video Head.(See
page 3-7.) Or check Cylinder
Assembly and service it if detective.
Cleaning the Video Head.(See
page 3-7.) Or check Cylinder
Assembly and service it if detective.
NG
CheckTU701 and A-OUT jack, and service it if detective.
(AV1) (AV2)
Check IC451 and
service it if detective. Check Audio signal at pin
65 and pin 67 of IC451.
Audio problem 4 (No playback Hi-Fi Audio)
OK
OK
NG Check IC451 and
service it if detective.
OK
NG
Check signal at pin 24 and pin 27 of IC451.
OK NG
RF-INPUT
NG NG
Check SIF signal at pin
2 of CN701.
Check signal at pin 26 of IC451.
Check signal at pin 26 of IC451.
Check Audio signal at
pin 4 and 5 of CN701 or
pin 4 and 50 of IC451.
Check TU701 and
service it if detective.
LINE INPUT (AV1)
Check Audio signal at
pin 6 and pin 52 of IC451.
Check Audio signal at pin 10 and 56 of IC451.
Check A/V cable, JK101
and line between JK101
and pin (6, 52) of IC451,
and service it if detective.
OK
OK
Cleaning the Video Head.(See page 3-7.) Or check Cylinder Assembly and service it if detective.
Cleaning the Video Head.
(See page 3-7.)
Check signal at pin 26 of IC451.
Cleaning the Video Head.(See page 3-7.) Or check Cylinder Assembly and service it if detective.
Check AFV CBA and
service it if detective.
NG
Check IC451 and service it if detective.
NG
Check IC451 and
service it if detective.
NG
LINE INPUT (AV2)
Check AV cable, JK102 and line between JK102 and
pin (10, 56) of IC451, and service it if detective.
Audio problem 3 (No recording Hi-Fi Audio)
NG
NG
NG
OK
OK
OK
OK
OK

3-5
Power problem
It is highly recommended that a variable isolation
transformer which can monitor current be used.
(Alternatively a variable AC source which moni-
tors current will do). Read directions below before
power is added!
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.
1] 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.
2] Remove the following components and check for
defects: snubber diode (D005), switching FET (Q001),
source resistor (R006), control transistor (Q002).
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. Per-
form 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 (R003, R004, R005
and R028).
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 exe-
cute the under-mentioned parts breakage check.
(Remove the part from PCB.)
switching FET (Q001), source resistor (R006), control
transistor (Q002), gate resistor (R008) and start resis-
tor (R003, R004, R005 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) and (D015) may be defective.
Repair method
CHECK
Connect unit to the isolation trans-
former and slowly increase the AC sup-
ply 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.
YES #1
NO
Check whether the primary rectifying
DC of the Switching power supply has
an output. (Reading should be about
168V.)
NO #2
YES
With the primary DC working check
the secondary 5V. NO #3
YES
Are the 44V, 12V and 5V
higher than normal? YES #4
NO
Although the secondary 5V is working,
are any of the other voltages higher
than normal (44V and 12V)? YES #5
NO
There is no problem on the SW power
supply.

3-6
3-2 STANDARD MAINTENANCE
3-2-1 Service Schedule of Components
Notes:
1.Clean all parts for the tape transport (Upper Drum with Video Head / Pinch Roller / Audio Control Head / Full
Erase Head) using 90% lsopropyl Alcohol.
2.After cleaning the parts, do all DECK ADJUSTMENTS.
3.For the reference numbers listed above, refer to Deck Exploded Views.
* FE Head Assembly (B73) is used in VT-FX340E(UK) only.
h: Hours : Check I: Change
Deck Periodic Service Schedule
Ref.No. Part Name 1,000 h 2,000 h 3,000 h 4,000 h
B2 Cylinder Assembly II
B3 Loading Motor Assembly I
B8 Pulley Assembly (HI) II
B587 Tension Lever Assembly II
B31 AC Head Assembly I
B573, B574 Reel S, Reel T I
B37 Capstan Motor II
B52 Cap Belt II
*B73 FE Head Assembly I
B86 F Brake Assembly (HI) II
B133 Idler Assembly (HI) II
B410 Pinch Arm Assembly II
B414 M Brake (SP) Assembly (HI) II
B416 M Brake (TU) Assembly (HI) II
B525 LDG Belt II

3-7
3-2-2 Cleaning
Cleaning of Video Head
Clean the head with a head cleaning stick or chamois
cloth.
Procedure
1.Remove the top cabinet.
2.Put on a glove (thin type) to avoid touching the
upper and lower drum with your bare hand.
3.Put a few drops of 90% Isopropyl alcohol on the
head cleaning stick or on the chamois cloth and,
by slightly pressing it against the head tip, turn the
upper drum to the right and to the left.
Notes:
1.The video head surface is made of very hard
material, but since it is very thin, avoid cleaning it
vertically.
2.Wait for the cleaned part to dry thoroughly before
operating the unit.
3.Do not reuse a stained head cleaning stick or a
stained chamois cloth.
Cleaning of ACE Head
Clean the head with a cotton swab.
Procedure
1.Remove the top cabinet.
2.Dip the cotton swab in 90% Isopropyl alcohol and
clean the ACE head. Be careful not to damage the
upper drum and other tape running parts.
Notes:
1.Avoid cleaning the ACE head vertically.
2.Wait for the cleaned part to dry thoroughly before
operating the unit or damage may occur.
Do Not !
Cleaning Stick
Upper
Cylinder
Video Head
ACE Head