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BASIC TAPE MECHANISM : OVD-6
INTEGRATED COLOR TV/STEREO
VIDEO CASSETTE RECORDER
VX-S205
S/M Code No. 09-995-330-8N1
U
SERVICE MANUAL
DA
TA
GENERAL
120V AC, 60Hz
109W
25 kg (55 lbs.)
574 mm (W) x 480 mm (D) x
502 mm (H)
(22 5/8 x 19 x 19 7/8 in.)
406 mm (W) x 305 mm (H)
(16 x 12 1/8 in.)
508 mm (diagonal) (20 in.)
Frequency synthesized tuner
VHF: 2 to 13
UHF: 14 to 69
CATV: 5A, A-1 to A-5, A to W,
W+1 to W+84
M
230 lines
75 ohms, unbalanced
5°C to 40°C
Rotary 2 head helical
scanning system
SPECIFICATIONS
NTSC color system, 525 lines,
60 fields
Azimuth 2 head
VHS video cassette
SP: 33.35 mm/sec
LP: 16.67 mm/sec
SLP: 11.12 mm/sec
SP: 3 hours with T-180 tape
LP: 6 hours with T-180 tape
SLP: 9 hours with T-180 tape
1.0Vp-p, 75 ohm, unbalanced
1.0Vp-p, 75 ohm, unbalanced
48dB (nominal: tape)
­8.2dBs, 50K ohm
­8.2dBs, less than 50K ohm
3 tracks (Hi-Fi sound 2 tracks,
Normal sound 1 track)
Approx. 2 minutes 15 seconds
with T-120 tape
Approx. 1 minutes 48 seconds
with T-120 tape
VIDEO SIGNAL SYSTEM ................
VIDEO HEAD ...................................
USABLE CASSETTES .....................
TAPE SPEED ...................................
RECORDING/PLAYBACK TIME .....
VIDEO INPUT ...................................
VIDEO OUTPUT ..............................
VIDEO S/N .......................................
AUDIO INPUT ..................................
AUDIO OUTPUT ..............................
AUDIO TRACK .................................
FAST-FORWARD TIME ...................
REWIND TIME .................................
POWER REQUIREMENTS .................
POWER CONSUMPTION ...................
WEIGHT ..............................................
DIMENSIONS ......................................
TV SECTION
PICTURE TUBE ..................................
TUNER SYSTEM ................................
CHANNEL COVERAGE ......................
TV SYSTEM ........................................
HORIZONTAL RESOLUTION ............
ANTENNA INPUT ...............................
VCR SECTION
OPERATING TEMPERATURE ...........
VIDEO RECORDING SYSTEM ..........
Design and specifications are subject to change without
notice.
·


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TABLE OF CONTENTS
SPECIFICATIONS ..............................................................................................................................................................
TABLE OF CONTENTS .....................................................................................................................................................
SERVICING NOTICES ON CHECKING .............................................................................................................................
VCR TEST TAPE INTERCHANGEABILITY TABLE ...........................................................................................................
DISASSEMBLY INSTRUCTIONS
REMOVAL OF MECHANICAL PARTS AND P.C. BOARDS ...........................................................................................
REMOVAL OF DECK PARTS ..........................................................................................................................................
REMOVAL OF ANODE CAP ............................................................................................................................................
KEY TO ABBREVIATIONS .................................................................................................................................................
SERVICE MODE LIST .......................................................................................................................................................
PREVENTIVE CHECKS AND SERVICE INTERVALS .......................................................................................................
NOTE FOR THE REPLACING OF MEMORY IC ................................................................................................................
SERVICING FIXTURES AND TOOLS ................................................................................................................................
PREPARATION FOR SERVICING .....................................................................................................................................
MECHANICAL ADJUSTMENTS
CONFIRMATION AND ADJUSTMENT ............................................................................................................................
CONFIRMATION AND ADJUSTMENT OF TAPE RUNNING MECHANISM ..................................................................
MECHANISM ADJUSTMENT PARTS LOCATION GUIDE .............................................................................................
ELECTRICAL ADJUSTMENTS
ADJUSTMENT PROCEDURE .........................................................................................................................................
BASIC ADJUSTMENTS ...................................................................................................................................................
ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE .............................................................................................
PURITY AND CONVERGENCE ADJUSTMENTS ..........................................................................................................
TROUBLESHOOTING GUIDES ..........................................................................................................................................
IC DESCRIPTIONS ............................................................................................................................................................
SERVO TIMING CHART ....................................................................................................................................................
SYSTEM SWITCH MODE ...................................................................................................................................................
BLOCK DIAGRAMS
TV ....................................................................................................................................................................................
Y/C/AUDIO/HEAD AMP/IN/OUT ......................................................................................................................................
MICON/POWER/OPERATION .........................................................................................................................................
HIFI ..................................................................................................................................................................................
PRINTED CIRCUIT BOARDS (OPERATION/LED/DECK) .................................................................................................
OPERATION SCHEMATIC DIAGRAM ...............................................................................................................................
DECK SCHEMATIC DIAGRAM ...........................................................................................................................................
PRINTED CIRCUIT BOARDS (SYSCON) ..........................................................................................................................
Y/C/AUDIO/HEAD AMP SCHEMATIC DIAGRAM ..............................................................................................................
MICON SCHEMATIC DIAGRAM .........................................................................................................................................
POWER SCHEMATIC DIAGRAM .......................................................................................................................................
IN/OUT SCHEMATIC DIAGRAM ........................................................................................................................................
CHROMA/IF SCHEMATIC DIAGRAM ................................................................................................................................
SOUND AMP SCHEMATIC DIAGRAM ...............................................................................................................................
HIFI SCHEMATIC DIAGRAM ..............................................................................................................................................
PRINTED CIRCUIT BOARDS (MAIN/CRT) ........................................................................................................................
DEFLECTION SCHEMATIC DIAGRAM ..............................................................................................................................
TV POWER SCHEMATIC DIAGRAM .................................................................................................................................
CRT SCHEMATIC DIAGRAM .............................................................................................................................................
INTERCONNECTION DIAGRAM ........................................................................................................................................
SEMICONDUCTOR BASE CONNECTIONS ......................................................................................................................
WAVEFORMS ....................................................................................................................................................................
MECHANICAL EXPLODED VIEW ......................................................................................................................................
MECHANICAL REPLACEMENT PARTS LIST ...................................................................................................................
ACCESSORY REPLACEMENT PARTS LIST ....................................................................................................................
CHASSIS EXPLODED VIEW (TOP VIEW) .........................................................................................................................
CHASSIS EXPLODED VIEW (BOTTOM VIEW) .................................................................................................................
CHASSIS REPLACEMENT PARTS LIST ...........................................................................................................................
ELECTRICAL REPLACEMENT PARTS LIST .....................................................................................................................
COVER
A-1
A-2
A-3
B1-1, B1-2
B2-1~B2-5
B3-1
C1-1, C1-2
C2-1
C3-1, C3-2
C4-1
C5-1
C5-2, C5-3
D1-1, D1-2
D1-3, D1-4
D1-5
D2-1
D2-2~D2-4
D2-5, D2-6
D2-7
E-1~E-30
F-1~F-3
G-1
G-2
H-1
H-2
H-3
H-4
I-1
I-2
I-3
I-4~I-6
I-7
I-8
I-9
I-10
I-11
I-12
I-13
I-14
I-15
I-16
I-17
I-18
J-1
K-1~K-3
L1-1, L1-2
L2-1
L2-1
M1-1
M1-2
M2-1
N-1~N-5
A-1


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SERVICING NOTICES ON CHECKING
1. KEEP THE NOTICES
2. AVOID AN ELECTRIC SHOCK
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.
There is a high voltage part inside. Avoid an electric
shock while the electric current is flowing.
3. 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.
6. AVOID AN X-RAY
Safety is secured against an X-ray by considering about
the cathode-ray tube and the high voltage
peripheral circuit, etc.
Therefore, when repairing the high voltage peripheral
circuit, use the designated parts and make sure not
modify the circuit.
Repairing except indicates causes rising of high
voltage, and it emits an X-ray from the cathode-ray tube.
4. 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.
5. TAKE CARE TO DEAL WITH THE
CATHODE-RAY TUBE
In the condition that an explosion-proof cathode-ray
tube is set in this equipment, safety is secured against
implosion. However, when removing it or serving from
backward, it is dangerous to give a shock. Take
enough care to deal with it.
PERFORM A SAFETY CHECK AFTER
SERVICING
7.
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.
(INSULATION CHECK PROCEDURE)
1.
2.
3.
4.
Unplug the plug from the AC outlet.
Remove the antenna terminal on TV and turn on the
TV.
Insulation resistance between the cord plug terminals
and the eternal exposure metal [Note 2] should be
more than 1M ohm by using the 500V insulation resis-
tance meter [Note 1].
If the insulation resistance is less than 1M ohm, the
inspection repair should be required.
[Note 1]
If you have not the 500V insulation resistance meter,
use a Tester.
[Note 2]
External exposure metal: Antenna terminal
Earphone jack
A-2


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TTV-P16
TTV-P7
TTV-P2
TTV-P1L
TTV-P1
TTV-N7A
TTV-N2
TTV-N1E
TTV-N1
NTSC
NTSC, Color,
1kHz, SP
NTSC, Color,
1kHz, EP
NTSC, Color,
1kHz, SP
PAL, Color,
1kHz, SP
PAL, Color,
1kHz, LP
PAL, Stairsteps,
1kHZ, SP, HiFi,
1kHz
NTSC, Stairsteps,
7kHz, SP
NTSC, Stairsteps,
1kHz, SP, HiFi
400Hz
TTV-N12
(SCV-1998)
CH-2(3)
CH-2(1)
CH-2(4)
CH-1B(3)
CH-1B(4)
CH-1B(1)
CH-1B(4)
*2
CH-1B(2)
NTSC, Stairsteps,
1kHz, SP
NTSC, Color,
1kHz, EP
NTSC, Stairsteps,
7kHz, SP
NTSC, Color,
1kHz, EP
PAL, Stairsteps,
1kHz, SP
CH-2(2)
*3
PAL, Color,
1kHz, LP
PAL, Stairsteps,
6kHz, SP
PAL, Stairsteps,
6kHz, SP
PAL, Color, No
sound SP, HiFi
400Hz
*1. Described in the order of color format. Video signal. Linear audio. Tape speed and Hi-Fi audio.
*2. Use CH-1B (1) - (3) with models used exclusively in the SP mode.
*3. Use CH-2 (3) and (4) when it is necessary to observe the chroma signal.
There are two types of the new alignment tape CH-1B (for NTSC) and CH-2 (for PAL). On each tape four signals (1) - (4) are
recorded for the times and in the order shown below.
The TTV-MP1 (for M-PAL), TTV-MS1 (for MESECAM) and TTV-S1 (for SECAM) alignment tapes have the same contents as
the previous tapes.
(1) : 8min. ---> (2) : 2min. ---> (3) : 5min. ---> (4) : 5min.
Method
Contents*1
Model
Model
Contents*1
Application
Now in use TYPE
New TYPE
No Changed.
PB-Y Level/General electrical ADJ.
Head ACE Height/Tilt ADJ.
HiFi Audio PB Level ADJ.
Switching position. (LP Model)
FM Envelope ADJ. (LP Model)
X-Value ADJ. (LP Model)
Head ACE Azimuth ADJ.
FM Envelope ADJ. (SP Model)
X-Value ADJ. (SP Model)
HiFi Audio PB Level ADJ.
FM Filter ADJ.
FM envelope ADJ.
X-Value ADJ.
Head ACE Azimuth ADJ.
Switching position ADJ.
PAL
VCR TEST TAPE INTERCHANGEABILITY TABLE
Switching position ADJ.
PB-Y Level/General electrical ADJ.
Head ACE Height/Tilt ADJ.
PAL, Color, 400Hz,
SP, HiFi 1kHz
NTSC, Color, No
sound SP, HiFi
400Hz
A-3


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Front Cabinet
DISASSEMBLY INSTRUCTIONS
1. REMOVAL OF MECHANICAL PARTS
AND P.C. BOARDS
1-1: BACK CABINET (Refer to Fig. 1-1)
1.
2.
3.
4.
5.
Remove the 2 screws 1.
Remove the 4 screws 2.
Remove the 2 screws 3 which are used for holding the
Back Cabinet.
Remove the AC cord from the AC cord hook 4.
Remove the Back Cabinet in the direction of arrow.
1-3: TV/VCR BLOCK (Refer to Fig. 1-3)
1.
2.
3.
4.
Remove the 2 screws 1.
Disconnect the following connectors:
(CP4201, CP4202, CP303, CP501, CP502 and CP401).
Unlock the support 2.
Remove the TV/VCR Block in the direction of arrow.
Fig. 1-3
1-4: MAIN PCB (Refer to Fig. 1-4)
1.
2.
3.
4.
5.
6.
Remove the screw 1.
Remove the Main PCB Holder.
Remove the 2 screws 2.
Remove the 3 screws 3.
Disconnect the following connectors:
(CP810, CP820, CP804 and CD401).
Remove the Main PCB in the direction of arrow.
VCR Block
Main PCB
2
3
3
3
Fig. 1-4
2
1
Main PCB Holder
TV/VCR Block
2
UP TO
RELEASE
1
1
Fig. 1-1
1-2: CRT PCB (Refer to Fig. 1-2)
CAUTION: BEFORE REMOVING THE ANODE CAP,
DISCHARGE ELECTRICITY BECAUSE IT
CONTAINS HIGH VOLTAGE.
BEFORE ATTEMPTING TO REMOVE OR
REPAIR ANY PCB, UNPLUG THE POWER
CORD FROM THE AC SOURCE.
1.
2.
3.
Remove the Anode Cap.
(Refer to REMOVAL OF ANODE CAP)
Disconnect the following connectors:
(CP801, CP802 and CP850).
Remove the CRT PCB in the direction of arrow.
Fig. 1-2
Front Cabinet
CRT PCB
Front Cabinet
1
1
2
2
2
2
3
3
Back Cabinet
4
B1-1