SERVICE MANUAL
VIDEO CASSETTE RECORDER
FILE NO. 140-200123
W425
SERVICING NOTICES ON CHECKING
As for the places which need special attentions,
they are indicated with the labels or seals on the
cabinet, chassis and parts. Make sure to keep the
indications and notices in the operation manual.
PERFORM A SAFETY CHECK AFTER
SERVICING
4.
Confirm that the screws, parts and wiring which
were removed in order to service are put in the
original positions, or whether there are the
portions which are deteriorated around the
serviced places serviced or not. Check the
insulation between the antenna terminal or
external metal and the AC cord plug blades.
And be sure the safety of that.
2. USE THE DESIGNATED PARTS
The parts in this equipment have the specific
characters of incombustibility and withstand
voltage for safety. Therefore, the part which is
replaced should be used the part which has
the same character.
Especially as to the important parts for safety
which is indicated in the circuit diagram or the
table of parts as a
mark, the designated
parts must be used.
1. KEEP THE NOTICES
3. PUT PARTS AND WIRES IN THE
ORIGINAL POSITION AFTER
ASSEMBLING OR WIRING
There are parts which use the insulation
material such as a tube or tape for safety, or
which are assembled in the condition that
these do not contact with the printed board.
The inside wiring is designed not to get closer
to the pyrogenic parts and high voltage parts.
Therefore, put these parts in the original
positions.
Please include the following informations when you order parts. (Particularly the VERSION LETTER.)
1. MODEL NUMBER and VERSION LETTER
The MODEL NUMBER can be found on the back of each product and the VERSION LETTER can be
found at the end of the SERIAL NUMBER.
2. PART NO. and DESCRIPTION
You can find it in your SERVICE MANUAL.
HOW TO ORDER PARTS
A1-1
SERVICING NOTICES ON CHECKING .....................................................................................
HOW TO ORDER PARTS ..........................................................................................................
CONTENTS .................................................................................................................................
GENERAL SPECIFICATIONS ....................................................................................................
DISASSEMBLY INSTRUCTIONS
1. REMOVAL OF MECHANICAL PARTS AND P. C. BOARDS ............................................
2. REMOVAL OF DECK PARTS ............................................................................................
3. REMOVAL AND INSTALLATION OF FLAT PACKAGE IC ...............................................
KEY TO ABBREVIATIONS ........................................................................................................
SERVICE MODE LIST ................................................................................................................
PREVENTIVE CHECKS AND SERVICE INTERVALS ..............................................................
SERVICING FIXTURES AND TOOLS .......................................................................................
PREPARATION FOR SERVICING .............................................................................................
MECHANICAL ADJUSTMENTS ................................................................................................
ELECTRICAL ADJUSTMENTS ..................................................................................................
BLOCK DIAGRAMS
Y/C/AUDIO/CCD/HEAD AMP .................................................................................................
SYSTEM CONTROL/SERVO ..................................................................................................
TUNER .....................................................................................................................................
OPERATION/POWER ..............................................................................................................
PRINTED CIRCUIT BOARDS
SYSCON/OPERATION ...........................................................................................................
SCHEMATIC DIAGRAMS
Y/C/AUDIO/CCD/HEAD AMP .................................................................................................
SYSTEM CONTROL/SERVO ..................................................................................................
POWER ...................................................................................................................................
OPERATION ............................................................................................................................
TUNER ....................................................................................................................................
INTERCONNECTION DIAGRAM ............................................................................................
WAVEFORMS .............................................................................................................................
MECHANICAL EXPLODED VIEW .............................................................................................
CHASSIS EXPLODED VIEWS ...................................................................................................
MECHANICAL REPLACEMENT PARTS LIST .........................................................................
CHASSIS REPLACEMENT PARTS LIST ..................................................................................
ELECTRICAL REPLACEMENT PARTS LIST ...........................................................................
CONTENTS
A1-1
A1-1
A2-1
A3-1~A3-5
B1-1
B2-1~B2-6
B3-1, B3-2
C1-1, C1-2
C2-1
C3-1
D1-1
D1-1
D2-1~D2-4
D3-1, D3-2
E-1, E-2
E-3, E-4
E-5, E-6
E-7, E-8
F-1~F-4
G-1, G-2
G-3, G-4
G-5, G-6
G-7, G-8
G-9, G-10
G-11, G-12
H-1
I1-1
I2-1, I2-2
J1-1
J2-1, J2-2
J3-1, J3-2
A2-1
GENERAL SPECIFICATIONS
G-1
VCR
System
VHS Player / Recorder
System
Video System
NTSC
Hi-Fi STEREO
No
NTSC PB(PAL60Hz)
No
Deck
DECK
OVD-7
Loading System
Front
Motor
3
Heads
Video Head
4Head
FM Audio Head
No
Normal Audio /Control
Mono / Yes
Erase(Full Track Erase)
Yes
Tape
Rec
PAL
-
Speed
NTSC
SP/SLP
Play
PAL
-
NTSC
SP/LP/SLP
Fast Forward / Rewind Time (Approx.)
FF:4'50"/REW:2'30"
with Cassette
T-120
Forward/Reverse
NTSC or PAL-M
SP/LP/SLP=3x,5x/7x,9x/9x,15x
Picture Search
PAL or SECAM
-
Frame Advance
1/10
Slow Speed
1/10
G-2
Tuning
Broadcasting System
US System M
System
Tuner and
System
1Tuner
Receive CH
Destination
USA(w/CATV)
Tuning System
F-Synth
Input Impedance
VHF/UHF 75 OHM
CH Coverage
2-69,4A,A-5~ A-1,A~I, J~ W
W+1~W+84
Intermediate
Picture(FP)
45.75MHz
Frequency
Sound(FS)
41.25MHz
FP-FS
4.50MHz
Preset CH
No
RF Converter Output
Yes
Channel
3 or 4 ch
Level/Impedance
66dBu /75ohm
Sound Selector
No
Stereo/Dual TV Sound
No
G-3
Power
Power Source
AC
120V,60Hz
DC
-
Power Consumption
Power On(at AC)
8W
at 120V 60Hz
Stand by (at AC)
1.8W at 120V 60Hz
Per Year
-
kWh/Year
Protector
Power Fuse
Yes
Dew Sensor
No
G-4
Regulation
Safety
UL
Radiation
FCC
G-5
Temperature
Operation
5oC - 40oC
Storage
-20oC - 60oC
G-6
Operating Humidity
Less then 80% RH
G-7
Signal
Video Signal
Input Level
1 V p-p/75 ohm
Output Level
1 V p-p/75 ohm
S/N Ratio (Weighted)
50
Horizontal Resolution at SP Mode
230Line
Audio Signal
Input Level
-8dBm/50Kohm
(0dB=0.775Vrms)
Output Level
-8dBm/1Kohm
S/N Ratio at SP (Weighted)
42dB
Harmonic Distortion (1KHz)
1.5%
Frequency Response
at SP
100Hz - 10kHz
at LP
100Hz - 6kHz
at SLP
100Hz - 4kHz
Hi-Fi Audio Signal
Dynamic Range : More than
-
Frequency Response
-
Wow And Flutter : Less than
-
Channel Separation : More than
-
Harmonic Distortion : Less than
-
A3-1
GENERAL SPECIFICATIONS
G-8
On Screen
Menu
Yes
Display
Menu Type
Character
ATS
No
Timer Rec Set
Yes
Auto Repeat On/Off
Yes
SAP On Off
No
CH Set-Up
Yes
TV/CATV
Yes
Auto CH Memory
Yes
Add/Delete
Yes
Pin Code Registration
No
System Set-Up
No
Clock Set
Yes (Calendar 12H)
Language
Yes
No Noise Back Ground
Yes
G-CODE(or SHOWVIEW or PLUSCODE)No. Entry
No
NICAM 1/2,NICAM Off,Audio Output
No
Stereo,Audio Output,SAP
No
Play/Stop/FF/Rew/Rec/OTR/T-Rec/Pause/Eject/Tape In (Symbol
Mark)
Yes
CH/AV
Yes
Clock
Yes
Repeat
Yes
Pin Code
No
Tape Counter
Yes
Index
No
Hotel Lock
No
Tape Speed
Yes
ATR/Manual Tracking
Yes
Hi-Fi
No
S-Repeat/SR-R/SR-Play
No
VPS
No
PDC
No
G-9
OSD Language
English French
Spanish
G-10
Clock,Timer
Calendar
1990/1/1 ~ 2081/12/31
and Timer
Timer Events
8 prog/1 month
Back-up
One Touch Recording Max Time
5 Hours
OTPB
Valid Time
No
Timer Back-up (at Power Off Mode)
5 sec.
G-11
Display
Indicator
No
Indicator Type
-
Clock/Counter,CH,Timer Rec,OTR, Play
Rec,FF(Cue),Rew(Rev),Stop,ATR
-
Pause
-
Still
-
Eject(Tape Mark Flash)
-
Slow
-
WKL,Y.M.D,Start,End
-
AFT
-
Repeat
-
A-DUB
-
VCR
-
Memory
-
Index
-
VPS
-
PDC
-
SP
-
LP
-
SLP
-
AM
-
PM
-
F1,F2
-
RF Output CH
-
Tape In
A3-2