Akai VS-X9EGN User manual

AKAT
Service
manual
moan vs sven DX Abner
MULTI SYSTEM
TYE RECORDER
VIDEO CASSE
INTERACTIVE MONITOR SYSTEM
VIDEO CASSETTE RECORDER
MODEL VS-X9EGN
SPECIFICATIONS
ee arr ee ae VHS standard Audio
Video recording system ... Rotary, slant azimuth two-head Line input level... .... —8 dBm/50 K ohms, unbalanced
helical scan system Line output level ...... —6 dBm/ 1 K ohms, unbalanced
Rotary heads ......... DX4 video heads S/Nratio .......... more than 40 dB
RFinput ........... System B/G, D/K,I,M Frequency response .... 70 — 10,000 Hz (SP mode)
(Europe ch.) ........ VHF ch 2 — 4,S1 —S10,5 —12, | Recording/playback time
S11 — 820 NISC | 2 8 cece ee eter e tne 160 min. with T-160 cassette on
UHF ch 21 — 69 SP mode
(USA ch.) .......... VHF ch 2 — 6,7 — 13 NTSC! fuses ee ee 480 min. with T-160 cassette on
UHF ch 14 — 83 SLP mode
CABLE ch A-1,A-2,A—-I,J -W COIRG 6 ghs euro doy tisk 240 min. with E-240 cassette on
(Japanch.) ......... VHF ch 1 — 3,4 — 12 SP mode
UHF ch 13 — 62 Tape speed
RF output... ......... B/G, I, M, D/K type modulation NTSC SP mode..... 33.35 mm/sec. (1-5/16 i.p.s.)
(BAL): 6-058 ashe acse ten 8 UHF ch 30 — 39 SLP mode .... 11.12 mm/sec. (7/16 ip.s.)
adjustable (preset ch 36) CCIR SP mode(only) . 23.39 mm/sec.
(NTSC) ........... UHF ch 26 — 38 Quick finder
adjustable (preset ch 34) NTSC SP mode..... approx. 3 times normal speed
Recording (line input) . . . . PAL (System B, G, I) SLP mode .. . . approx. 9 times normal speed
SECAM (SECAM or CCIR SP mode(only) . approx. 3 times normal speed
MESECAM tape) FF,REWtime ........ approx. 5 min. with E-240
NTSC 3.58 MHz cassette
NTSC 4.43 MHz Timer
Playback (line output)... . PAL Program ........... 6 program/2 week and sleep timer
SECAM (SECAM or Clock reference....... Quartz crystal
MESECAM tape) Display ............ TV screen (Tape counter, Timer
NTSC 3.58 etc.)
NTSC 4.43 Power requirements ..... 110 — 250 V AC, 50/60 Hz
Video Power consumption ..... 27W
Line input level... .... 0.5 — 2.0 Vp-p/75 ohms, Operating temperature. . . . 5°C — 40°C
unbalanced Dimensions .......... 425 (W) x 95 (H) x 345(D) mm
Line output level... . .. 1.0 Vp-p/75 ohms, unbalanced (16.5 x 3.7 x 13.4 inches)
S/Nratio .......... more than 45 dB Weight ............-. 5.9 Kg (13.0 Ibs)
Horizontal resolution
PADS <-305. ween’ 4 more than 250 lines
SECAM(MESECAM) .. more than 220 lines
NTSC(SP MODE) .... more than 240 lines
* For improvement purposes, specifications and design are subject to change without notice.
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* SAFETY INSTRUCTIONS
PRECAUTIONS DURING SERVICING
1. Parts identified by the A&A symbol parts are critical
for safety. Replace only with parts number specified.
2. In addition to safety, other parts and assemblies are
specified for conformance with such regulations as
those applying to spurious radiation.
These must also be replaced only with specified
replacements.
Examples: RF converters, tuner units, antenna
selector switches, RF cables, noise blocking capacitors,
noise blocking filters, etc.
3. Use specified internal wiring. Note especially:
1) Wires covered with PVC tubing
2) Double insulated wires
3) High voltage leads
4. Use specified insulating materials for hazardous live
parts. Note especially:
1) Insulation Tape
2) PVC tubing
3) Spacers (Insulating Barriers)
4) Insulation sheets for transistors
5) Plastic screws for fixing microswitch (especially
in turntable)
5. When replacing AC primary side components (trans-
formers, power cords, noise blocking capacitors, etc.),
wrap ends of wires securely about the terminals
before soldering.
‘te fo
6. Observe that wires do not contact heat producing
parts (heatsinks, oxide metal film resistors, fusible
resistors, etc.).
* INFORMATION
7.
Check
that
replaced
wires
do
not
contact
sharp
edged
or
pointed
parts.
8.
Also
check
areas
surrounding
repaired
locatoins,
9.
Use
care
that
foreign
objects
(screws,
solder
droplets,
etc.)
do
not
remain
inside
the
set.
SAFETY CHECK AFTER SERVICING
Confirm
the
specified
insulation
resistance
between
power
cord
plug
prongs
and
externally
exposed
parts
of
the
set
is
greater
than
10
M
ohms.
but
for
equipment
with
external
antenna
terminals
(tuner,
receiver,
etc.)
and
is
intended
for
[C]
or
[A],
specified
insulation
re-
sistance
should
be
headphone
jacks
line-in-out
jacks
etc.
more
than
2.2
M
ohms
(ground
terminals,
microphone
jacks).
PRECAUTIONS FOR LITHIUM BATTERY
The lithium battery may explode when heated exces-
sively.
[OBSERVE THE FOLLOWING WHEN REPLACING]
@ Replace with the same make and type only.
Use soldering iron in “recommended way” only.
Place battery in correct polarity.
Do not short the terminals.
Do not recharge battery.
Do not dispose of battery in fire.
(DANGER) (RECOMMENDED WAY)
SYMBOLS FOR PRIMARY DESTINATION
Alphabet indicates the destination of the units as listed
below.
Symbols Principal Destinations
| Usa
UK
Canada
Europe (except UK)
Japan
Australia
W. Germany only
Universal Area
a |
Custom version
VOLTAGE CONVERSION
A switching regulated power supply has been employed
for the VS-X9EGN.
The arrangement has enabled to operate at a broad range
of mains power voltages (110V AC to 240V AC) with-
out any voltage switching requirements.
SERVICE MANUAL

I. DISASSEMBLY
In case of trouble etc. necessitating dismantling, please dismantle in the order shown in the photographs. Reassemble
in reverse order.
1 Removal of Upper Cover 5 Removal of Video PCB
3. Removal of Front Panel 7 Removal of Ejector Block
STOPPER
Disconnect PilO
+ |
8 Removal of Main PCB
STOPPER
SERVICE MANUAL
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It. CONTROLS
2019 1817 16 #15
1. Load the video cassette tape here.
2. Multisystem selectors and indicators.
To select the broadcast system.
3. Multisystem AUTO selector.
To set the VCR for automatic system selection.
4. TIMER indicator.
5.
Tape
Speed
indicator
(For
NTSC
system
only).
6. STAND-BY indicator.
Tells you the power cord is plugged in and the
power switch is on.
7.
To
receive
the
remote
control
signal
from
the
Akai
Remote
Control
Unit.
*
Keep
this
window
clean
for
remote
control
Operation.
8. CHANNEL display.
9. CHANNEL selector.
To select a preset channel with the built-in tuner
of the VCR.
10. Tape transport buttons.
To run the tape for recording or playback.
1413 12 11 10 9
11.
12.
13.
14,
15.
16.
17.
18.
19.
20.
Fig. 2-1
EJECT button.
To eject the video cassette tape.
POWER button.
To turn on and off the Akai VCR.
TIMER button.
To stand by for automatic recording.
Tape Speed Selector.
(For NTSC system only.)
Tuning controls.
To tune in preset channels.
Tuning control cover panel.
RF MODE selector.
To select B/G or D/K RF Output.
STILL TRACKING control
To fine tune the STILL playback picture.
TRACKING control.
To fine tune the play back picture.
SHARP/SOFT PICTURE control.
To soften or sharpen the video picture.
vee
SERVICE
MANUAL
——___$—$$—$_—_$—$—_———————
4

The remote control contains operation buttons which are used the same way as the
operation buttons on the front panel of the Akai VCR, and many which appear on the
remote control only. The remote control can be used from a distance of up to 5 meters.
Channel number buttons. (Hidden under cover.)
Use these buttons for immediate access to any station
without scanning the whole band. For single digit stations,
press‘“‘0” and the number, or just the number itself.
Transmitter beam
POWER button. (Hidden under cover.)
TIMER button.
To stand-by for automatic recording.
DISPLAY button.
To choose the CLOCK/COUNTER and display it on the
TV screen.
Counter RESET button.
To reset the tape counter to “0000”.
Channel selector
Tape transport buttons
To set and store all the CLOCK and PROGRAM settings.
SET and SHIFT and MEMORIZE buttons.
PROGRAM button.
CLOCK button.
MEMO and CANCEL buttons.
Fig, 2-2
Saftey Lock System
This VCR can be locked to prevent access by small children. This feature can be operated by the remote
control only.
To lock: With the VCR POWER ON, depress and hold the remote control’s STOP button for about 4 seconds.
aa “L” will momentarily flash on the CHANNEL display. Tape play will not function unti! the VCR is
unlocked.
To unlock: Depress and hold the remote control’s PLAY button for about 4 seconds.
Even if the POWER is turned off, the VCR will remain locked until released.
C—O SERVICE MANUAL

= =
lll.
PRINCIPAL
PARTS
LOCATION
BO 2 ON OO OR OOO S
SW POWER PC BOARD
PRE AMP PC BOARD
IMPEDANCE ROLLER
FULL TRACK ERASE HEAD
SUPPLY TAPE GUIDE
HEAD DRUM BLOCK
LOADING LEADER (L)
TENSION ARM
SYNCHRO BELT
SUPPLY REEL TABLE
TAKE UP GEAR BLOCK
12.
13.
14,
15.
16.
17.
18.
19.
20.
21.
22.
Fig. 3-1 Top View
SENSOR LED
TAKE UP REEL TABLE
OPERATION PC BOARD
MAIN PC BOARD
VIDEO PC BOARD
CAPSTAN SHAFT
CAPSTAN MOTOR
PINCH ROLLER
AUDIO/CONTROL HEAD
LOADING LEADER (R}
LOADING MOTOR
SERVICE MANUAL —————__— $$$ _____________

HONOR WN
CAPSTAN MOTOR
CAPSTAN BELT
CAPSTAN FLYWHEEL
IDLER BELT
REEL SENSOR PCB
TAKE-UP GEAR BLOCK
DRUM MOTOR BLOCK
SUPPLY LOADING GEAR
10.
11.
V2:
13.
14.
16.
SERVICE MANUAL
Fig. 3-2. Bottom View
TAKE-UP LOADING GEAR
EJECT CAM GEAR
EJECT SWITCH
ROTARY ENCORDER
MAIN GEAR CAM
SYNCHRO BELT
LOADING MOTOR
2
i
j

IV.
MECHANICAL
ADJUSTMENT
4-1.
BACK
TENSION
ADJUSTMENT
2)
Depress
the
POWER
button
on
the
Front
Panel.
1)
Remove
the
EJECTOR
BLOCK
and
disconnect
P110
3).
Set
ane
unit
co
apeloaded:
mode
with
shou
pin
@
from
the
Main
PCB.
and
pin
(§)
of
P110
as
example
shown
in
Fig.
4-1.
Fig. 4-1
4)
Set
the
Back
Tension
jig
(AT-751181)
and
put
some
5)
Press
the
PLAY
button,
then
check
and
adjust
back
weight
on
the
Back
Tension
jig
as
a
stabilizer.
tension
as
30
~
35
g-cm
by
the
TENSION
HOLDER
ppsition.
TENSION
ARM
TENSION
HOLDER
SUPPLY REEL
SLIGHTLY TABLE
LOOSEN
THIS SCREW
Fig. 4-2
Tes
F
;
g
SERVICE MANUAL ——————_—$ |
8

4-2. LOADING LEADER HEIGHT
ADJUSTMENT
1) Slight loosen the set screw at the lower part of
the LOADING LEADER so that the LOADING
LEADER can be adjusted with reasonable tightness.
Adjust the coarse height of the LOADING LEADER
from the base mount as 0.6 to 0.8 mm.
2) Set the reference tape AT-751775 (TF-530RFS) and
depress the PLAY button.
3) Connect the Oscilloscope to pin @) RF ENVELOPE
test terminal of connector P4 on the PRE-AMP P.C.
BOARD and turn the LOADING LEADER height
adjustment screw heads to obtain the flat envelope
as Fig. 4-5 ideal envelope.
4) After the adjustments, tighten the LOADING
LEADER set screw.
L HEIGHT TOO HIGH L HEIGHT TOO LOW
LOADING
LEADER (L)
n= SERVICE MANUAL
IDEAL ENVELOPE
SWITCHING
PULSE
RF.
ENVELOPE GND
QOD
PRE-AMP PCB
Fig. 4-3
LOADING LEADER
HEIGT ADJUSTMENT
SCREW HEAD
0.6 to 0.8mm
SET SCREW
Fig. 4-4
R HEIGHT TOO HIGH R HEIGHT TOO LOW
LOADING
LEADER (R)
Fig. 4-5
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4-3. TAPE CURL AT TAKE-UP TAPE
GUIDE ADJUSTMENT
Turn the screw (@) on the A/C HEAD BLK so that the
down edge of the tape touches the TAKE-UP TAPE
GUIDE lower part without any curl or waving.
SCREW (@)
— A/C HEAD BLOCK
©~ -- TAPE GUIDE
New,
Fig. 4-6
O to O.!mm
(a) NO GOOD (b) GOOD (¢)NO GOOD
Fig. 4-7
4-4. AUDIO HEAD AZIMUTH ADJUSTMENT
1) Turn the NUT (a) for coarse A/C HEAD BLOCK
height adjustment as in Fig. 4-7, 8.
0.2 to 0.3mm
a \
AUDIO HEAD
CONTROL HEAD
savas
Fig. 4-8
NUT G@)
A/C HEAD BLOCK
©-— < TAPE GUIDE
ae, ©
Fig. 4-9
10
SERVICE MANUAL
2)
Connect
an
oscilloscope
or
AC
voltmeter
to
the
AUDIO
LINE
OUT.
3) Set the reference tape TF-530RFS (AT-751775) and
depress the PLAY button.
4)
Turn
the
screw
(6)
to
obtain
the
maximum
audio
signal
output.
TAPE GUIDE
Fig. 4-10
4-5. RF ENVELOPE ADJUSTMENT
1) Set the reference tape TF-530RFS (AT-751775) and
depress the PLAY button.
2) Slightly turn the LOADING LEADER HEIGHT
ADJUSTMENT SCREW HEAD (L) (R) to obtain the
IDEAL ENVELOPE as shown in Fig. 4-5.
4-6. TAPE CURL AT SUPPLY TAPE
GUIDE ADJUSTMENT
1) Check the tape curl at Supply Tape Guide slightly
turn the NUT @) if the tape curl exists.
F.E HEAD
IMPEDANCE
NUT@) a ROLLER
/
/
LNG GOOD aoe GOOD
Fig. 4- 12
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