Hitachi VTMX-231A User manual

)
LEAN @l |
SERVICE MANUAL
VHS
This video deck is VHS type video
recorder. For proper operation, only
the VHS type cassette must be
used.
‘TK || No.4804E |
VT-MX231A
VT-MX231AC
VT-MX231AW
VT-MX431A
VT-MX431AC
CONTENTS
MAIN SECTION
Specifications
Important Safety Precautions
Standard Notes for Servicing
Preparation for Servicing ..........
Operating Controls and Functions ...
Cabinet Disassembly Instructions ...
Electrical Adjustment Instructions
Block Diagrams ....
Function Indicator Symbols ... a
SchematicDiagrams / CBA’ s and Test Points ... 1- 9 -1
Waveforms ....
Wiring Diagram .
System Control Timing Charts
IC Pin Function Descriptions ...
Lead Identifications
t
7 :
1-1
1-2-1
1-3-1
1-4-1
1-5-1
1-6-1
1-7-1
1-8-1
DECK MECHANISM SECTION
Standard Maintenance
Fixture and Tape for Adjustment ..
Mechanical Alignment Procedures ........:e:sceseees 2-
Disassembly / Assembly Procedures of
Deck Mechanism ..... 2-4-4
Front Loading Assembly
Alignment Procedures of Mechanism
EXPLODED VIEWS AND PARTS LIST SECTION
Exploded Views
Mechanical Parts List
Electrical Parts List
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
VIDEO CASSETTE RECORDER
June 1998
Image & Information Media Systems Division, Tokai

MAIN SECTION
(ili,
VT-MX231A / VT-MX231AC / VT-MX231AW
VT-MX431A / VT-MX431AC
“a
MAIN SECTION
@ Specifications
@ Preparation for Servicing
@ Adjustment Procedures
@ Schematic Diagrams
lin, @CBA's
TABLE OF CONTENTS
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Operating Controls and FUNCHONS ....ccsceseeesessesseescsssecenesssnsaresssssesseessecnasateneensateneensessseceaeenenesteneenesseeenensaes 1-5-1
Cabinet Disassembly Instructions. ...........2ccccscccecersscsscsrcesenevesseesscssessssesesesecacnsensnenaeansneeasnaeneueneneaeensoesntenensensesy 1-6-1
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SYMDOIS
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1-13-1

SPECIFICATIONS
Models: VT-MX231A/MX231AC/MX231 AW
4. Tuner
Description Unit Minimum | Nominal [Maximum] Condition |
1. Video See :
1-1 Video Output (PB) Vp-p __ 08 1.0 1.2 SP Mode
1-2 Video Output (R/P) Vp-p | 08 1.0 1.2
1-3 Video S/N Y (RIP) dB 40 45 SP Mode
1-4 Video Color S/N AM (R/P) dB 35 44 SP Mode
1-5 Video Color SINPM(R/P) dB 31 [38 SPMode
1-6 Resolution (PB) Line | 210 230 SP Mode _
2. Servo fh
2-1 Jitter Low (R/P) psec 0.05 0.2 SP Mode
2-2 Wow & Flutter (R/P) % 0.25 0.6 |SPMode__
3. NormalAudio
3-1 Output (PB) dBV 10 6 2 SP Mode
3-2 Output (R/P) aBV | -10 6 2 [SP Mode WIS A)
3-3 SIN (RIP) dB 36 40 __ {SP Mode
3-4 Distortion (R/P) % | 15 4.0 SP Mode
3-5 Freq. response (R/P) at 200Hz SP Mode _
(-20dB ref. 1kHz) at 8kHz SP Mode
4-1 Video Output (E-E) Vp-p 0.8 4.0 | 12 | E-E Mode
4-2 Video S/N (E-E) dB 40_ 45 E-E Mode i
4-3 Audio Output (E-E) dBV_ “9 -6 3 E-E Mode
4-4 Audio S/N (E-E)
Models: VT-MX431A/MX431AC
1. Video
Maximum | |
~| E-E Mode (JIS A)
Condition
1-1 Video Output (PB) | Vp-p 0.8 7.0 | 1.2 |SPMode
1-2 Video Output (R/P) Vp-p | 0.8 10 1.2 <=
1-3 Video S/N Y (R/P) dB | 41 44 ; SP Mode
1-4
Video
Color
S/N
AM
(R/P)
dB
35
|
44
SP
Mode
|
1-5 Video Color S/N PM (R/P) dB 33 37 _| SP Mode
1-6 Resolution (PB) Line 210 230 SP Mode
2.
Servo
cede
bere
2-1
Jitter
Low
(R/P)
_
psec
0.05
0.1
|
SP
Mode
2-2
Wow
&
Flutter
(R/P)
%
0.2
0.4
SP
Mode
3.
NormalAudio
i
See
3-1 Output (PB) dBV -10 6 =e SP Mode
~_ 3-2 Output (R/P) dBV -10 6 -2_| SP Mode WS A)
3-3
S/N(R/IP)
dB
|
88
43
_____
|
SP
Mode
3-4
Distortion
(R/P)
A
falc
ty
oO
asf
7
2
40
SP
Mode
3-6
Freq.
response
(R/P)
at
200Hz
dB
6
0
7
SP
Mode
(-20dB ref. ikHz) at 8kHz dB 6 1.5 SP Mode
4.
Tuner
=
4-1
Video
Output
_.
Vp-p
0.8
1.0
1.2
|
E-E
Mode
4-2
Video
S/N
(S/N
Y
signal}
dB]
40
47
E-E
Mode
4-3
Audio
Output
(1kHz)
dBV
lO!
oy
6
_|
E-E
Mode
4-4
Audio
S/N
(1kHz)
dB
40
E-E
Mode
(JIS
A)
Note:
Nominal
specs
represent
the
design
specs.
All
units
should
be
able
to
approximate
these
—
some
will
exceed
and
some
may
drop
slightly
below
these
specs.
Limit
specs
represent
the
absolute
worst
condition
that
still
might
be
considered
acceptable;
In
no
case
should
a
unit fail
to
meet
limit
specs.
1-1-1
(ill,
fi
IMPORTANT SAFETY PRECAUTIONS
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 A onschematics and in parts lists. Use of a substi-
tute 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 compli-
ance, it is equally important to implement the following
precautions when a set is being serviced.
Precautions during Servicing
A.Parts identified by the A 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 soldering.
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.
1-2-1
1. 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.

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
speci-
fied 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)
Table 1: Ratings for selected area
AC Line Voltage | Clearance Distance (d) (d’)
Ne
Vv
>
3.2
mm
(0.126
inches)
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 be-
tween B (earth ground, power cord plug prongs) and
externally exposed accessible parts (RF terminals, an-
tenna terminals, video and audio input and output ter-
minals, 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.
Table 2: Leakage current ratings for selected areas
AC Line Voltage
Leakage Current (i)
STANDARD NOTES FOR SERVICING
gm. Circuit Board Indications
a. The output pin of the 3 pin Regulator ICs is indicated
as shown.
Chassis or Secondary Conductor
Primary Circuit Terminals
Top View Bottom View
on fin ee ( Jo ©
b. For other ICs, pin 1 and every fifth pin are indicated
as shown.
§
m | pnt ORO mro
[TY Ob
10
© Exposed Accessible Part
c. The 1st pin of every male connector is indicated as
shown.
Pin +1 CROKOROKCES
AC Voltmeter -
(High Impedance)
ral Earth Ground
Power Cord Plug Prongs Instructions for Connectors
am 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 in-
serted parallel into the connector, not at an angle.
Fig. 2
Earth Ground (B) to:
Ns
v
os
aie
teas
ei
i
<
0.5mMA
Peak
Exposed
accessible
parts
Note:
This
table
is
unofficial
and
for
reference
only.
Be
sure
to
confirm
the
precise
values.
x
O
FFC Cable
Connector
a ——,
* Be careful to avoid a short circuit.
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 ma-
chine, then apply hot air to the Flat Pack-IC (about
5 to 6 seconds). (Fig. S-1-1)
Fig. $-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 tweez-
ers. (Fig. S-1-6)
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. 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
Desoildering
Machine
Tweezers
1-3-1
1-2-2

PREPARATION FOR SERVICING
How to Use U17 Deck Extension
Cable
(1) Remove the Deck Mechanism Assembly. If
needed, remove the Main CBA from the chassis.
Refer to "Cabinet Disassembly Instructions" on
page 1-6-1.
(2) Connect Main CBA and Deck with the U17 Deck
Extension Cable (A) as shown in Fig. 1. And con-
nect Main CBA and Deck with U17 Deck Exten-
sion Cable (B) as shown in Fig. 1. Connect 2
Clips on U17 Deck Extension Cable (B) to Shield
on Main CBA.
(U17 Deck Extension Cable: 7069201)
U17 Deck ~
Extension Cable (A). |
CN1008 (for 2 Head) —.
[VT-MX231A, VT-MX231AC,
VT-MX231 AW] i
CN1010 (for 4 Head) |
[VT-MX431A, VT-MX231AC]
CN1003
CN1001
——~o ss
fut 7 Deck Extension Cable
Note 1: There are 3 types of U17 Deck Extension Cable
(A). They are for 2 Head, 4 Head, and Hi-Fi. Use a
connector indicated as shown. Be careful not to let the
unused connector contact other parts.
Note 2: Some noise will be present in the playback
picture when the extension cable is used.
|
Service Part No. |
7069201
U17 Deck
Extension Cable (B}
How to Enter the Service Mode
Note: When the unit is set in the service mode, the
display will keep blinking.
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, connect TP502 (SENSOR INHIBITION) to TP501
(GROUND). 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. 2.
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.
REC-Sat
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. 2.
ow L
chads igaees
&7 CN501
Q503. 0
SW506
1
(=f (REC-SAFETY SW)
1-4-2

OPERATING CONTROLS AND FUNCTIONS
Models : VT-MX231A/MX231AC/MX231AW
NOTES:
Some controls are located on both the VCR and on the remote control, some are only located on one, some controls
operate certain functions only in one location. See each description for details.
We do not recommend the use of universal remote controls. Not all of the functions may be controlled with a universal
remote control. If you decide to use a universal remote control with this unit, please be aware that the code number
given may not operate this unit. In this case, please call the manufacturer of the universal remote control.
—VCR Front Panel—
1. Cassette Compartment
2. STOP button— Press to stop the tape motion.
EJECT button-Press to remove a tape from the
VCR.
v button-Press to enter digits when setting pro-
gram (For example: setting clock or timer program).
Press to select the setting modes from the on screen
menu. (only on the remote control)
1-5-1
3. REW button-Press to rewind the tape, or to view
the picture rapidly in reverse during the playback
mode. (Rewind Search)
“4 button-Press to cancel a setting of timer pro-
gram. Press to correct digits when setting program
(For example: setting clock or timer program). Press
to add or delete channel numbers during channel
preset. (only on the remote control)
4. PLAY button—Press to begin playback.
A button~Press to enter digits when setting pro-
gram (For example: setting clock or timer program).
Press to select the setting modes from the on screen
menu. (only on the remote control)
5.F.FWD button—Press to rapidly advance the tape,
or view the picture rapidly in forward during play-
back. (Forward Search)
b button-When setting program (For example:
setting clock or timer program), press to determine
your selection and proceed to the next step you want
to input. Press to determine the setting modes from
the on screen menu. Press to add or delete channel
numbers during channel preset. (only on the remote
control)
6.PAUSE button—Press to temporarily stop the tape
during recording or to view a still picture during
playback. (only on the remote control)
7.POWER button-Press to turn VCR on and off.
Press to activate timer recording.
8. VCRI/TV button—Press to select TV or VCR mode.
(only on the remote conirol)
VCR position: to view playback, to monitor video
recordings or watch TV using the VCR tuner.
TV position: to watch TV or to view one program
while recording another.
Models : VT-MX231A/MX231AC/MX231AW
—-Rear View-—
22 23 24 25
@
@)
4 | =
i our oN OUT
I » @.. of
BE 26 27 28 29
9.Remote sensor window-~Receives the infrared
signals from the remote control.
10. Digital display
11.SPEED button-Press to choose the desired re-
cording speed : SP/LP/SLP. (only on the remote
control)
12. CHANNEL(CH) &/ W buttons~Press to select the
desired channels for viewing or recording.
Tracking function—Press to minimize video ‘noise’
(lines or dots on screen) during playback. (only on
the VCR)
Press to stabilize the picture in the Still mode when
the picture begins to vibrate vertically.
13. REC button—-Press for manual recording.
IRT button—Press to activates Instant Recording
Timer. (only on the VCR)
14.NUMBER buttons-Press to select desired chan-
nels for viewing or recording. To select channels
from 1 to 9, first press "O" button then 1 to 9. (only
on the remote control)
+100 button—When selecting cable channels which
are higher than 99, press this button first, then press
the last two digits. (To select channel 125, first press
"4100" button then press "2" and "5"). (only on the
remote control)
15.MENU button—Press to display the menus on the
TV screen. Press to exit the menus on the TV
screen. (only on the remote control)
16. DISPLAY button-Press to display the counter or
the current channel number and the current time on
the TV screen. (only on the remote control)
17.RENTAL SELECTOR button—-Press to set the
Rental Play mode on and off during playback. (only
on the remote control)
18. AUTO REPEAT button-Press to repeat playback
automatically. (only on the remote control)
19, CLOCK/COUNTER button—Press to display or al-
ternate between clock and counter on the TV
screen. (only on the remote control)
20. COUNTER MEMORY button-Press to set counter
memory on and off. (only on the remote control)
21. COUNTER RESET button—Press to reset counter
to 0:00:00. (only on the remote control)
EXIT button—Press to exit the menus on the TV
screen. (only on the remote control)
22. Power cord-Connect to a standard AC outlet (110-
240V, 50/60Hz).
23. AUDIO OUT jack—Connect to the audio input jack
of your audio equipment or another VCR.
24. AUDIO IN jack-Connect to the audio output jack of
your audio equipment or another VCR.
25. ANT. IN terminal-Connect to an antenna, Cable
system or Satellite system.
26. VIDEO OUT jack-Connect to the video input jack
of your video camera or another VCR.
27. VIDEO IN jack—Connect to the video output jack of
your video camera or another VCR.
28. CH3/CH4 selector switch—Use to select a video
output channel (3 or 4) for VCR playback.
29. ANT. OUT terminal—Connects to the antenna input
terminal on your TV.

Models : VT-MX431A/MX431AC
NOTES:
Some
controls
are
located
on
both
the
VCR
and
on
the
remote
control,
some
are
only
located
on
one,
some
controls
operate
certain
functions
only
in
one
location.
See
each
description
for
details.
We
do
not
recommend
the
use
of
universal
remote
controls.
Not
all
of
the
functions
may
be
controlled
with
a
universal
remote
control.
If
you
decide
fo
use
a
universal
remote
control
with
this
unit,
please
be
aware
that
the
code
number
given
may
not
operate
this
unit.
In
this
case,
please
call
the
manufacturer
of
the
universal
remote
control.
—VCR Front Panel
~— Remote Control—
eee
=
|
XX
1. Cassette Compartment
2.REW button—Press to rewind the tape, or to view
the picture rapidly in reverse during the playback
mode. (Rewind Search)
“@ button-Press to cancel a setting of timer pro-
gram. Press to correct digits when setting program
(For example: setting clock or timer program). Press
to add or delete channel numbers during channel
preset. (only on the remote control)
3. STOP button- Press to stop the tape motion.
EJECT button—Press to remove a tape from the
VCR. (only on the VCR)
1-5-3
¥ button-Press to enter digits when setting pro-
gram (For example: setting clock or timer program).
Press to select the setting modes from the on screen
menu. (only on the remote control)
4. PLAY button—Press to begin playback.
4 button-Press to enter digits when setting pro-
gram (For example: setting clock or timer program).
Press to select the setting modes from the on screen
menu. (only on the remote control)
5.F.FWD button—Press to rapidly advance the tape,
or view the picture rapidly in forward during play-
back. (Forward Search)
& button—When setting program (For example:
setting clock or timer program), press to determine
your selection and proceed to the next step you want
to input. Press to determine the setting modes from
the on screen menu. Press to add or delete channel
numbers during channel preset. (only on the remote
control)
6.POWER button-Press to turn VCR on and off.
Press to activate timer recording.
7.Remote sensor window-Receives the infrared
signals from the remote control.
8. Digital display
9.
CHANNEL(CH)
A/
¥
buttons—Press
to
select
the
desired
channels
for
viewing
or
recording.
Tracking function—Press to minimize video ‘noise’
(lines or dots on screen) during playback (only on
the VCR) or slow mode.
Press to stabilize the picture in the Still mode when
the picture begins to vibrate vertically.
10. REC button—Press for manual recording.
IRT
button-Press
to
activates
Instant
Recording
Timer.
(only
on
the
VCR)
Models : VT-MX431A/MX431AC
—Rear View—
26 27 28 29
z Z __ (8)
] 7
n or FR our:
aD
Pas
Ww 30 31 32 33
11.NUMBER buttons—Press to select desired chan-
nels for viewing or recording. To select channels
from 1 to 9, first press "O" button then 1 to 9. (only
on the remote control)
+100 button—When selecting cable channels which
are higher than 99, press this button first, then press
the last two digits. (To select channel! 128, first press
"4100" button then press "2" and "5"), (only on the
remote control)
ENTER(only on the remote control)
12.MENU button—Press to display the menus on the
TV screen. Press to exit the menus on the TV
screen. (only on the remote control)
13. DISPLAY button-—Press to display the counter or
the current channel number and the current time on
the TV screen. (only on the remote control)
14, TAPE SPEED button—Press to choose the desired
recording speed : SP/LP/SLP, (only on the remote
control)
15. QUICK-FIND button—Quick Find mode. (only on
the remote control)
16. COUNTER RESET button-Press to reset counter
to 0:00:00. (only on the remote control)
EXIT button—-Press to exit the menus on the TV
screen. (only on the remote control)
17. COUNTER MEMORY button-—Press to set counter
memory on and off. (only on the remote control)
18. TIME SEARCH button—Time Search mode. (only
on the remote control)
19. INDEX SEARCH button-Index Search mode. (only
on the remote control)
20. PAUSE button—Press to temporarily stop the tape
during recording or to view a still picture during
playback. (only on the remote control)
Frame Advance function—-Press to advance the
picture by one frame at a time during the still mode.
(only on the remote control)
1-5-4
21. SLOW button—Press to start slow motion playback.
The slow speed can be controlled by pressing the
F.FWD button (faster) or the REW button (slower).
(only on the remote control)
22, VOL(ume) buttons— Press to adjust the desired
TV's volume level by using either A or ¥ button.
{only on the remote control)
23. MUTE button— Press to mute the TV’s sound. Press
it again to resume the sound. (only on the remote
control)
24. VCR/TV button—Press to select TV or VCR mode.
(only on the remote control)
VCR position: to view playback, to monitor video
recordings or watch TV using the VCR tuner.
TV position: to watch TV or to view one program
while recording another.
25. MODE SELECT buttons (only on the remote con-
trol)
CATV button
TV button
VCR button
26.Power cord-Connect to a standard AC outlet
(120V/60Hz).
27, AUDIO OUT jack--Connect to the audio input jack
of your audio equipment or another VCR.
28. AUDIO IN jack—Connect to the audio output jack of
your audio equipment or another VCR.
29. ANT. IN terminal—Connect to an antenna, Cable
system or Satellite system.
30. VIDEO OUT jack~Connect to the video input jack
of your video camera or another VCR.
31. VIDEO IN jack-Connect to the video output jack of
your video camera or another VCR.
32. CH3/CH4 selector switch—Use to select a video
output channel! (3 or 4) for VCR playback.
33. ANT. OUT terminal—Connects to the antenna input
terminal on your TV.

ELECTRICAL ADJUSTMENT INSTRUCTIONS
General Note: "CBA" is an abbreviation for
"Circuit Board Assembly."
NOTE:
1. Electrical adjustments are required after replacing
circuit components and certain mechanical parts. It
is important to do these adjustments only after all
repairs and replacements have been completed.
Also, do not attempt these adjustments unless the
proper equipment is available.
2.70 perform these alignment / confirmation proce-
dures, make sure that the tracking control is set in
the center position: Press either channel "W" or "A"
button first, then the " PLAY " button(VCR’s Front
Panel only).
Test Equipment Required
1. Oscilloscope: Dual-trace with 10:1 probe, V-Range:
0.001~50V/Div., F-Range: DC~AC-20MHz
2. Alignment Tape (MH-1)
Head Switching Position Adjust-
ment
Purpose:
To determine the Head Switching point during play-
back.
Symptom of Misadjustment:
May cause Head Switching noise or vertical jitter in
the picture.
Test Point
TP751(V-OUT)
TP302(RF-SW)
TP501(GND)
Adj. Point
VR501
(Switching Point)
(MAIN CBA)
Measurement
Equipment
Oscilloscope
Spec.
6.5H+1H
(412.7s+60ys)
Connections of Measurement Equipment
Oscilloscope
TP751
TP501 cs
TP302 (e)
CH2
Trig. (+)
Main CBA
Figure 1
Poa EXT. Syncronize Trigger Point
"
41 1.0H
TORIES ety
Switching Pulse
Reference Notes:
Play back the Alignment tape and adjust VR501 so that
the V-sync front edge of the CH1 video output waveform
is outthe 6.5H(412.7ps) delayed position from the rising
edge of the CH2 head switching pulse waveform.

Servo/System Control Block Diagram
*1 NOTE: The loading motor drive IC is either
IC507A(TA7291S) or 1C507B(LB1641).
(DECK MECHANISM)
| DRUM MOTOR UNIT
|
|
|
These
ICS
are
exchangeable
parts.
|
|
|
|
BLOCK DIAGRAMS
RS501
REMOTE
SENSOR
ORUM
(ae SW CBA )
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VEETVIEEIS TITS
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BLOCK
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BLOCK
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Video
Block
Diagram
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Video
Block
Diagram
(VT-MX431A/431
AC)
= =
a
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VIDEO
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Audio Block Diagram
@A
PB-AUDIO
SIGNAL
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REC-AUDIO
SIGNAL
Mode
:
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MAIN CBA »
| TU701
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CONTROL BLOCK \oINSEL-2
{C301 (AUDIO PROCESS)
( | | | |
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Power
Supply
Block
Diagram
NOTE:
CAUTION
CAUTION
!
Ns
The
voltage
for
parts
in
hot
circuit
is
measured
using
FOR
CONTINUED
PROTECTION
AGAINST
FIRE
HAZARD,
Fixed
voltage
(and
Auto
voltage)
power
supply
circuit
is
used
in
this
unit.
hot
GND
as
a
common
terminal.
REPLACE
ONLY
WITH
THE
SAME
TYPE
FUSE.
If
Main
Fuse
(F001)
is
blown,
check
to
see
that
alt
components
in
the
ATTENTION
:
POUR
UNE
PROTECTION
CONTINUE
LES
RISQES
power
supply
circuit
are
not
detective
before
you
connect
the
AC
plug
to
DINCELE
N'UTILISER
QUE
DES
FUSIBLE
DE
MEMO
TYPE.
the
AC
power
supply.
Otherwise
it
may
cause
some
components
in
the
nok
OF
FIRE-REPLACE
FUSE
AS
MARKED.
power
supply
circuit
to
fail.
“This symbol means fast operating fuse."
"Ce
symbole
represente
un
fusible
a
fusion
rapide."
A
F001
A
1001
D001
-
D004
A
1001
AGAR
1A
250V
;
of
.
aa[7
NS
jae
CHOKE
BRIDGE
L
|
colt
|
|
RECTIFIER
|~f
+
ey
:
=
CALHI2V_)
|
Qo02
(3
ter
a
Ko
=
Q055
|
A
Ico01
ies
)
k
VOLTAGE
DET!
1
MAIN CBA
1-8-10

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
Note:
Briefly
(5
seconds)
displays
which
feature
the
VCR
is
currently
performing.
PWR.
©]
fee!
VCR
REC
Fl
itt)
=
it}
Taw
P
=,
IN;
i
p
i
a
4y
Playback
fc
E
Fast
forward
o
1
E
i
Rewind
g
7
i
f
Stop
fa
E
2
Recording
f
rl
q
Tuning
LED
MODE
INDICATOR
ACTIVE
ON
CASSET "IN"
CASSET
"OUT"
OFF
VCR/TV
VCR
MODE
"VCR"
“ON
VCR/TV
TV
MODE
"VCR
"
OFF
CLOCK
"88:88
,
"ON
-
"AM"
"PM"
ON
POWER
ON
"PWR"
“
“ON
a
REC
"REC"
=
ON
REC
PAUSE
"REC
*
~
~~
Blinks
at
0.8Hz
interval
T-REC,
OTR
wa]
ON
=
(T-REC OFF, T-REC incomplete
Blinks at 0.8Hz interval)
AUTE
RETURN
Blinks
at
0.8Hz
interval)
When
Reel
and
Capstan
Mechanism
is
joo
"No.
1
(grid
1)
Blinks
at
0.8Hz
interva
Not
Functioning
Correctly
;
When
Tape
Loading
Mechanism
is
Not
(eke)
"No.
2(grid
1)
Blinks
at
0.8Hz
interva
Functioning
Correctly
When
Cassette
Loading
Mechanism
is
exe)
"No.
3(grid
1)
Blinks
at
0.8Hz
interva!
Not
Functioning
Correctly
When
the
Drum
is
Not
working
properly
lool
"No.
4(grid
1)
Blinks
at
0.8Hz
interval
Blinks at 0.8Hz interval
| S-INH CONDITION
1-8-11

ICR.
SCHEMATIC
DIAGRAMS
/
CBA’S
AND
TEST
POINTS
Standard Notes
Warning
Many
electrical
and
mechanical
parts
in
this
chassis
have
special
characteristics.
These
characteristics
often
pass
unnoticed
and
the
protection
afforded
by
them
cannot
necessarily
be
obtained
by
using
replace-
ment
components
rated
for
higher
voltage,
wattage,
etc.
Replacement
parts
that
have
these
special
safety
char-
acteristics
are
identified
in
this
manual
and
its
supple-
ments;
electrical
components
having
such
features
are
identified
by
the
mark
"
4."
in
the
schematic
diagram
and
the
parts
list.
Before
replacing
any
of
these
compo-
nents,
read
the
parts
list
in
this
manual
carefully.
The
use
of
substitute
replacement
parts
that
do
not
have
the
same
safety
characteristics
as
specified
in
the
parts
list
may
create
shock,
fire,
or
other
hazards.
Capacitor
Temperature
Markings
pi
ie}
9
Mark
Capacity
Standard
|Temperature
change
rate
|
temperature
range
(B)
+10%
|
20°C
~25-485°C
(F)
|
+30
-80%
20°C
-25-485°C
(SR)
£15%
20°C
“25-+85°C
“430
-80%
=10~+70°C
Capacitors
and
transistors
are
represented
by
the
fol-
lowing
symbols.
CBA Symbols
(Top
View)
(Bottom
View)
a
mead * Electrolytic Capacitor
“TN
(Bottom View)
: * Transistor or Digital Transistor
Note:
)
1.Do
not
use
the
part
number
shown
on
these draw-
ings
for
ordering.
The
correct
part
number
is
shown
in
the
parts
list,
and
may
be
slightly
different
or
amended
since
these
drawings
were
prepared.
2.
All
resistance
values
are
indicated
in
ohms
(K=10°,
M=10°).
3.
Resistor
wattages
are
1/4W
or
1/6W
unless
other-
wise
specified.
4.
All
capacitance
values
are
indicated
in
pF
(P=10
SF).
5.
All
voltages
are
DC
voltages
unless
otherwise
speci-
fied.
Schematic
Diagram
Symbols
)
Digital Transistor
oun
“MG
§
=
-GO
B
(Top
View)
(Top
View)
NPN
Transistor
PNP
Transistor
ECB ECB
(Top
View)
(Top
View)
NPN
Digital
Transistor
PNP
Digital
Transistor
)
ECB
ECB
LIST
OF
GAUTION,
NOTES,
AND
SYMBOLS
USED
IN
THE
SCHEMATIC
DIAGRAMS
ON
THE
FOLLOWING
PAGES:
1, CAUTION:
FOR
CONTINUED
PROTECTION
AGAINST
FIRE
HAZARD,
REPLACE
ONLY
WITH
THE
SAME
TYPE
FUSE.
=
ATTENTION:
POUR
UNE
PROTECTION
CONTINUE
LES
RISQES
D'INCELE
N'UTILISER
QUE
AN
DES
FUSIBLE
DE
MEMO
TYPE.
RISK
OF
FIRE-REPLACE
FUSE
AS
MARKED.
s This symbol means fast operating fuse.
Ce symbole représente un fusible a fusion rapide.
2. CAUTION:
Fixed
Voltage
(or
Auto
voltage
selectable)
power
supply
circuit
is
used
in
this
unit.
{f
Main
Fuse
(F001)
is
blown,
first
check
to
see
that
all
components
in
the
power
supply
circuit
are
not
defective
before
you
connect
the
AC
plug
to
the
AC
power
supply.
Otherwise
it
may
cause
some
components
in
the
power
supply
circuit
to
fail.
3. Note:
(1)Do
not
use
the
part
number
shown
on
the
drawings
for
ordering.
The
correct
part
number
is
shown
in
the
parts
list,
and
may
be
slightly
different
or
amended
since
the
drawings
were
prepared.
(2)To
maintain
original
function
and
reliability
of
repaired
units,
use
only
original
replacement
parts
which
are
listed
with
their
part
numbers
in
the
parts
list
section
of
the
service
manual.
4. Wire Connectors
(1)
Prefix
symbol
"CN"
means
"connector"
(can
disconnect
and
reconnect).
(2)
Prefix
symbol
"CL"
means
“wire-solder
holes
of
the
PCB"
(wire
is
soldered
directly).
5.
Note:
Mark
"'s"
is
a
leadless
(chip)
component.
6. Mode: SP/REC
7.
Voltage
indications
for
PLAY
and
REG
modes
on
the
schematics
are
as
shown
below:
PLAY mode
«~~ REC mode
wero
5.0 [~~ [5.0
\ 28)
The same voltage for
Indicates that the voltage
both
PLAY
&
REC
modes
is
not
consistent
here.
Unit: Volts
8. How to read converged lines
1-D3
| Le Distinction Area
Line Number
(1 to 3 digits)
Examples:
1.
"1-D3"
means
that
line
number
"1"
goes
to
area
"D3".
2.
"1-B1"
means
that
line
number
"1"
goes
to
area
"Bi".
9. Test Point Information
@
:
Indicates
a
test
point
with
a
jumper
wire
across
a
hole
in
the
PCB.
Co»
:
Used
to
indicate
a
test
point
with
a
component
lead
on
foil
side.
@
:
Used
to
indicate
a
test
point
with
no
test
pin.
J
-
Used
to
indicate
a
test
point
with
a
test
pin.
1-9-2

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