Toshiba MV20FL4C Schematic
FILE NO. 140-200119
SERVICE MANUAL
COLOR TELEVISION/
VIDEO CASSETTE RECORDER
MV20FL4C
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.
2. AVOID AN ELECTRIC SHOCK
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.
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 cathoderay 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.
6. AVOID AN X-RAY1. KEEP THE NOTICES
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 cathoderay tube.
PERFORM A SAFETY CHECK AFTER
7.
SERVICING
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.
Unplug the plug from the AC outlet.
2.
Remove the antenna terminal on TV and turn
on the TV.
3.
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 resistance meter
[Note 1].
4.
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
HOW TO ORDER PARTS
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.
A1-1
TABLE OF CONTENTS
SERVICING NOTICES ON CHECKING.....................................................................................
HOW TO ORDER PARTS ..........................................................................................................
TABLE OF CONTENTS..............................................................................................................
GENERAL SPECIFICATIONS ...................................................................................................
DISASSEMBLY INSTRUCTIONS
1. REMOVAL OF MECHANICAL PARTS AND P. C. BOARDS............................................
2. REMOVAL OF DECK PARTS ............................................................................................
3. REMOVAL OF ANODE CAP ..............................................................................................
4. REMOVAL AND INSTALLATION OF FLAT PACKAGE IC ...............................................
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 ................................................................................................
ELECTRICAL ADJUSTMENTS..................................................................................................
BLOCK DIAGRAMS
TV ............................................................................................................................................
Y/C/AUDIO/CCD/HEAD AMP/IN/OUT ....................................................................................
MICON/POWER/OPERATION/DECK....................................................................................
HIFI .........................................................................................................................................
PRINTED CIRCUIT BOARDS
MAIN/CRT................................................................................................................................
OPERATION/DECK ................................................................................................................
SYSCON/COMB ......................................................................................................................
SCHEMATIC DIAGRAMS
Y/C/AUDIO/CCD/HEAD AMP .................................................................................................
MICON .....................................................................................................................................
POWER ...................................................................................................................................
IN/OUT .....................................................................................................................................
CHROMA/IF.............................................................................................................................
SOUND AMP ...........................................................................................................................
HIFI ..........................................................................................................................................
DIGITAL COMB FILTER .........................................................................................................
TV POWER..............................................................................................................................
DEFLECTION ..........................................................................................................................
CRT..........................................................................................................................................
OPERATION ...........................................................................................................................
DECK.......................................................................................................................................
INTERCONNECTION DIAGRAM ...............................................................................................
WAVEFORMS .............................................................................................................................
MECHANICAL EXPLODED VIEWS...........................................................................................
CHASSIS EXPLODED VIEWS ...................................................................................................
MECHANICAL REPLACEMENT PARTS LIST .........................................................................
CHASSIS REPLACEMENT PARTS LIST..................................................................................
ELECTRICAL REPLACEMENT PARTS LIST...........................................................................
A1-1
A1-1
A2-1
A3-1~A3-5
B1-1, B1-2
B2-1~B2-5
B3-1
B4-1, B4-2
C1-1, C1-2
C2-1
C3-1, C3-2
C4-1
C5-1
C5-2
D1-1~D1-4
D2-1~D2-6
E-1, E-2
E-3, E-4
E-5, E-6
E-7, E-8
F-1, F-2
F-3, F-4
F-5~F-8
G-1, G-2
G-3, G-4
G-5, G-6
G-7, G-8
G-9, G-10
G-11, G-12
G-13, G-14
G-15, G-16
G-17, G-18
G-19, G-20
G-21, G-22
G-23, G-24
G-25, G-26
G-27, G-28
H-1, H-2
I-1, I-2
I-3, I-4
J1-1
J2-1, J2-2
J3-1~J3-3
A2-1
GENERAL SPECIFICATIONS
G-1 TV CRT CRT Size / Visual Size 20 inch / 508.0 mmV
G-2 VCR System VHS Player / Recorder
G-3 Tuning Broadcasting System US System M
G-4 Signal Video Signal Input Level 1 V p-p/75 ohm
G-5 Power Power Source AC 120V,60Hz
G-6 Regulation Safety CSA
G-7 Temperature Operation +5oC ~ +40oC
System CRT Type Flat
Color System NTSC
Speaker 2 Speaker
Sound Output MAX 1.5W + 1.5W
System Video System NTSC
Hi-Fi STEREO Yes
NTSC PB No
Deck DECK OVD-6S
Heads Video Head 4 Head
FM Audio Head 2 Head
Audio /Control Mono /Yes
Erase(Full Track Erase) Yes
Tape Rec PAL Speed NTSC SP/SLP(EP)
Play PAL -
Fast Forward / Rewind Time (Approx.) FF:4'50"/REW:2'30"
Forward/Reverse NTSC or PAL-M SP/SLP(EP) = 3x,5x / 9x,15x
Picture Search
Frame Advance 1/10
Slow Speed 1/10
System Tuner and System 1 Tuner
Receive CH Destination US(w/CATV)
Intermediate Picture(FP) 45.75MHz
Frequency Sound(FS) 41.25MHz
Preset CH
Stereo/Dual TV Sound US-ST
Tuner Sound Muting Yes
Audio Signal
(0dB=0.775Vrms)
Hi-Fi Audio Signal Dynamic Range : More than 90 dB
Power Consumption at AC 115 W at 120 V 60 Hz
Protector Power Fuse Yes
Deflection 90 degree
Magnetic Field BV/BH + 0.45 G / 0.18 G
Position Front
Size 3 Inch
Impedance 8 ohm
10%(Typical) 1.5W + 1.5W
Loading System Front
Motor 3
NTSC SP/SLP(EP)
with Cassette T-120
Tuning System F-Synth
Input Impedance VHF/UHF 75 ohm
CH Coverage
FP-FS 4.5MHz
Output Level 1 V p-p/75 ohm
S/N Ratio (Weighted) 50
Horizontal Resolution at SP Mode 220Line
Input Level
Output Level
S/N Ratio at SP (Weighted) 38
Harmonic Distortion (1KHz) 1.5 %
Frequency Response at SP 100Hz - 10kHz
at LP -
at SLP 100Hz - 4kHz
Wow And Flutter : Less than 0.01 %Wrms
Channel Separation : More than 60 dB
Harmonic Distortion : Less than 1.0 %
DC -
at DC Stand by (at AC) 5 W at 120 V 60 Hz
Per Year -
Dew Sensor
Radiation DOC
X-Radiation HWC
Storage -20oC ~ +60oC
-8dB/50Kohm
-8dB/1Kohm
2~69, 4A,A-5~A-1, A~I, J~W,W+1~W+84
No
No
A3-1
GENERAL SPECIFICATIONS
(Symbo
)
A
g/M
g
Y
G-8 Operating Humidity Less then 80% RH
G-9 On Screen Menu Yes
G-10 OSD Language English French Spanish
G-11 Clock,Timer Calendar 1990/1/1 ~ 2081/12/31
Display Menu Type Character
G-CODE(or SHOWVIEW or PLUSCODE)No. Entry
Clock / Date Yes
CH/AV Yes
Tape Counter(Linear Counter) Yes
Tape Speed Yes
Sleep Time Yes
Stereo/Audio Output Yes
Control Volume Yes
Level Bright / Contrast / Sharpness / Color Yes
Play/Stop/FF/Rew/Rec/OTR/T-Rec/Pause/Eject/Tape In
uto Trackin
Caption / Text Yes
Index
Muting Yes
Hi-Fi Yes
Repeat Yes
Zero Return
DEW
and Timer Timer Events 8 Program/ 1 Month
Back-up One Touch Recording Max Time 5 Hours
OTPB Valid Time
Sleep Timer Max Time 120
On/Off Timer Program(On Timer / Off Timer) 1
Auto Shut Off No Signal 15
Timer Back-up (at Power Off Mode) 5
Timer Rec Set Yes
Channel Setup Yes
TV Setup Yes
Auto Repeat On/Off Yes
System Setup Yes
Commercial Advance
Movie Advance
Tint Yes
Bass/Treble/Balance Yes
Manual Tracking Yes
anual Trackin
OSD Language Setting English
TV/CATV Yes
Auto CH Memory Yes
Add/ Delete Yes
Guide CH Set
V-chip Set
On/Off Timer Set Yes
Picture Yes
Audio Yes
Sap On/Off Yes
Clock Set Yes (Calendar 12h)
Language Yes
Auto Clock On/Off Yes
Standard Time Yes
Daylight Saving Time Yes
Marking On/Off
Blueback On/Off
Playback Auto/Manual
Unmarked Tape
Go To Movie
Go To Preview
Bilingal
SAP Yes
l Mark
Step 10
No Operation
Yes
es
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Min
Min
Program
Min
No
Sec
A3-2
GENERAL SPECIFICATIONS
G-12 Remote Unit RC-DQ
Control Glow in Dark Remocon Yes
Format NEC
Custom Code 40-BFh,44-BBh
Power Source Voltage(D.C) 3V
UM size x pcs UM-4 x 2 pcs
Total Keys 44
Keys Power Yes
1 Yes
2 Yes
3 Yes
4 Yes
5 Yes
6 Yes
7 Yes
8 Yes
9 Yes
0 Yes
CH Up Yes
CH Down Yes
Volume Up Yes
Volume Down Yes
Input Select Yes
Play Yes
F.Fwd Yes
Rew Yes
Pause/Still Yes
Stop Yes
Rec/OTR Yes(2Keys)
Eject Yes
Counter Reset Yes
Speed Yes
Timer Rec Yes(2Keys)
TV Monitor
Quick View Yes
Program Yes
Slow Yes
Auto Tracking Yes
Set/Tracking+ Yes
Set/ Tracking - Yes
Menu Yes
Enter Yes
Cancel Yes
Call Yes
TV/Caption/Text Yes
Sleep Timer Yes
Muting Yes
Zero Return Yes
CM Skip Yes
Audio Select Yes
Keys
No
A3-3
GENERAL SPECIFICATIONS
G-13 Features Auto Head Cleaning Yes
G-14 Accessories Owner's Manual Language English/French
Auto Tracking Yes
HQ (VHS Standard High Quality) Yes
Auto Power On, Auto Play, Auto Rewind, Auto Eject Yes
VIDEO PLUS+(SHOWVIEW,G-CODE)
Auto Clock Yes
Forward / Reverse Picture Search Yes
Reverse Slow
One Touch Playback
Auto CH Memory Yes
Closed Caption Yes
TV Auto Shut off Function Yes
End Call
Index Search
SQPB
CATV Yes
CM Skip(30sec x 6 Times) Yes
Comb Filter Yes
TV Monitor
Program Extend
Choke Coil
Energy Star Yes
Protect of FBT Leak Circuit Yes
Dirty Head
V-chip USA V-chip
CANADA V-chip
CM Advance
Movie Advance
w/Guarantee Card Yes
Remote Control Unit Yes
Battery Yes
UM size x pcs UM-4 x 2 pcs
Rod Antenna
Poles -
Terminal Loop Antenna
Terminal U/V Mixer
300 ohm to 75 ohm Antenna Adapter Yes
Antenna Change Plug
DC Car Cord (Center+)
AC Plug Adapter
AC Cord
AV Cord (2Pin-1Pin)
Guarantee Card
Registration Card Yes
ESP Card
Warning Sheet
Dew/AHC Caution Sheet
Quick Set-up Sheet
Circuit Diagram
Service Station List Yes
Important Safeguard
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
A3-4
GENERAL SPECIFICATIONS
G-15 Interface Switch Power Yes
Indicator Power Red
Key Light up Rec/OTR
Terminals Front Video Input RCAx1
Rear Video Input RCAx1
G-16 Set Size Approx. W x D x H (mm) 574 x 483 x 514.5
G-17 Weight Net (Approx.) 26.5 kg( 58.5 lbs)
G-18 Carton Master Carton
Gift Box Yes
Drop Test Natural Dropping At
Container Stuffing(40' container) 171
G-19 Cabinet Material Cabinet Front PS 94V0 DECABROM
Play Yes
Pause/Still
System Select
One Touch Playback
Channel Up Yes
Channel Down Yes
F.FWD/Cue Yes
Eject/Stop Yes
Main Power SW
Volume Up Yes
Volume Down Yes
Rew/Rev Yes
Rec/OTR Yes
Input Select
Rec/OTR Red
T-Rec Red
On Timer
CS
One Touch Playback
Play
Audio Input RCA x 2(Stereo)
Other Terminal Head Phone(Stereo & Mono, 3.5mm)
Audio Input RCA x 2(Stereo)
Video Output RCAx1
Audio Output RCA x 2(Stereo)
Euro Scart
Diversity
Ext Speaker
DC Jack 12V(Center +)
VHF/UHF Antenna Input
AC Inlet
Gross (Approx.) 28.5 kg( 62.9 lbs)
Content -
Material -
Dimensions W x D x H(mm) -
Description of Origin -
Material DOUBLE/WHITE
Dimensions W x D x H(mm) 647 x 627 x 625
Design As per Buyer's
Description of Origin Yes
Height (cm) 31
Cabinet Rear PS 94V0 DECABROM
Jack Panel PS 94V0
F Type
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
1 Corner / 3 Edges / 6 Surfaces
Sets
A3-5
DISASSEMBLY INSTRUCTIONS
1. REMOVAL OF MECHANICAL PARTS
AND P.C. BOARDS
1-1: BACK CABINET (Refer to Fig. 1-1)
1.
Remove the 6 screws 1.
2.
Remove the 2 screws 2 which are used for holding the
Back Cabinet.
3.
Remove the AC cord from the AC cord hook 3.
4.
Remove the Back Cabinet in the direction of arrow.
Front Cabinet
1
1
1
1
2
2
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.
Remove the Anode Cap.
(Refer to REMOVAL OF ANODE CAP)
2.
Disconnect the following connectors:
(CP801, CP802 and CP805).
3.
Remove the CRT PCB in the direction of arrow.
1
3
Back Cabinet
1
Fig. 1-1
1-3: TV/VCR BLOCK (Refer to Fig. 1-3)
1.
Remove the 2 screws 1.
2.
Disconnect the following connectors:
(CP401, CP502, CP4201 and CP4202).
3.
Unlock the support 2.
4.
Remove the TV/VCR Block in the direction of arrow.
Front Cabinet
1
TV/VCR Block
2
UP TO
RELEASE
1-4: MAIN PCB (Refer to Fig. 1-4)
1.
Remove the screw 1.
2.
Remove the Main PCB Holder.
3.
Remove the 2 screws 2.
4.
Remove the 3 screws 3.
5.
Disconnect the following connectors:
(CP810A, CP820A and CP402).
6.
Remove the Main PCB in the direction of arrow.
2
2
Main PCB
Main PCB Holder
1
3
3
3
1
Fig. 1-3
Front Cabinet
CRT PCB
VCR Block
Fig. 1-4
Fig. 1-2
B1-1
DISASSEMBLY INSTRUCTIONS
1-5: DECK SHIELD PLATE (Refer to Fig. 1-5)
Remove the 2 screws 1.
1.
Remove the screw 2.
2.
Remove the Deck Shield Plate in the direction of arrow.
3.
Deck Shield Plate
2
1
1
VCR Block
1-6: DECK CHASSIS (Refer to Fig. 1-6)
1.
Remove the 3 screws 1.
2.
Disconnect the following connectors:
(CP1004, CP1005, CP1006, CP4001, CP4002 and
CP4003).
3.
Remove the Deck Chassis in the direction of arrow.
Fig. 1-5
1-7: JACK PLATE AND SYSCON PCB (Refer to Fig. 1-7)
1.
Remove the screw 1.
2.
Remove the Syscon PCB in the direction of arrow (A).
3.
Remove the 2 screws 2.
4.
Unlock the 2 supports 3.
5.
Remove the Jack Plate in the direction of arrow (B).
Jack Plate
2
2
3
Syscon PCB
1
(A)
Deck Holder
(B)
3
Fig. 1-7
Syscon PCB
1
1
1
Deck Chassis
Fig. 1-6
B1-2
DISASSEMBLY INSTRUCTIONS
2. REMOVAL OF DECK PARTS
2-1: TOP BRACKET (Refer to Fig. 2-1)
Remove the 2 screws 1.
1.
Slide the 2 supports 2 and remove the Top Bracket.
2.
NOTE
When you install the Top Bracket, install the screw (1)
first, then install the screw (2).
(2)
1
Top Bracket
2
Main Chassis
• Screw Torque: 5 ± 0.5kgf•cm
Top Bracket
2
Main Chassis
2-2: FLAP LEVER/TAPE GUIDE R (Refer to Fig. 2-2)
Move the Cassette Holder Ass'y to the back side.
1.
Remove the Polyslider Washer 1.
2.
Remove the Flap Lever.
3.
Unlock the 3 supports 2 and remove the Tape Guide R.
4.
(1)
1
Fig. 2-1
NOTE
When you install the Tape Guide L, install as shown in the
circle of Fig. 2-3-B. (Refer to Fig. 2-3-B)
Tape Guide L
REC Lever
• The REC Lever is not installed on the Video Cassette Player.
Fig. 2-3-B
2-4: CASSETTE HOLDER ASS'Y (Refer to Fig. 2-4)
Move the Cassette Holder Ass'y to the front side so that
1.
the Link Ass'y doesn't slip out.
Push the Locker R to remove the Cassette Side R.
2.
Remove the Cassette Side L.
3.
Main Chassis
Cassette Side R
Locker R
Tape Guide R
Flap Lever
2
2
2
Main Chassis
1
Fig. 2-2
2-3: TAPE GUIDE L (Refer to Fig. 2-3-A)
Move the Cassette Holder Ass'y to the back side.
1.
Unlock the 2 supports 1 and remove the Tape Guide L.
2.
Remove the REC Lever. (Recorder only)
3.
REC Lever
Tape Guide L
1
1
• The REC Lever is not installed on the Video Cassette Player.
Main Chassis
Fig. 2-3-A
Cassette Side L
Main Chassis
Fig. 2-4
2-5: CASSETTE SIDE L/R (Refer to Fig. 2-5)
Unlock the 4 supports 1 and then remove the Cassette
1.
Side L/R.
Remove the Cassette Earth Spring.
2.
NOTE
1.2.When you install the Cassette Side R, be sure to move
the Locker R after installing.
After the installation of the Cassette Holder, then install
the Cassette Earth Spring.
1
1
Cassette Side R
Cassette Earth Spring
Cassette Holder
Locker R
1
1
Cassette Side L
Fig. 2-5
B2-1
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