Panasonic PV-M1327 User manual

©1996 Matsushita-Kotobuki Electronics Industries LTD.
All rights reserved. Unauthorized copying and distribution
is a violation of law.
Combination-VCR
ORDER NO. MKS9701M321
B3, B6
PPV-M1327
P
PV-M1347
PPV-M1357W
QVV1307
Q
VV1317W
PPV-M2037
PPV-M2047
Q
VV2007
QVV2017W
R
®
Weight
SP: 1 - 5/16 i.p.s (33.35 mm/sec), LP: 21/32 i.p.s (16.67 mm/sec),
SLP: 7/16 i.p.s (11.12 mm/sec)
Record/Playback Time: 8 Hrs with 160 min. type tape used in SLP mode
FF/REW Time: Less than 3 min. (120 min. type tape)
Tape width 1/2" (12.7 mm) high density tape
87.5 ~ 108.1 MHz -- -
13 inch measured diagonal 90°deflection ---
20 inch measured diagonal 90°deflection ---
Source: 120V AC ±10%, 60 Hz ±0.5%
Consumption:Approx. 69 watts (power on), Approx. 6 watts (power off) ---
Approx. 110 watts (power on), Approx. 6 watts (power off) ---
EIA Standard (525 lines, 60 fields) NTSC Color Signal
41°F(5°C) ~ 104°F(40°C) (Temperature)
10% ~ 75% (Humidity)
15-3/16"(386mm) (W) X 15-7/8"(402.5mm) (H) X 16-11/16"(424mm) (D) ----
15-3/16"(386mm) (W) X 15-3/16"(385mm) (H) X 16-11/16"(424mm) (D) -----
20-3/10"(515mm) (W) X 19-4/5"(503mm) (H) X 19-1/10"(484mm) (D) --- -
20-3/10"(515mm) (W) X 19-4/5"(505mm) (H) X 19-1/10"(484mm) (D) ---- -
27.4 lbs. (12.4 kg) ----
26.0 lbs. (11.8 kg) -----
49.95 lbs. (22.67 kg) --- --
50.12 lbs. (22.75 kg) -----
50.67 lbs. (23 kg) ---- -
ITEM SPECIFICATION 123456
Head: 2 rotary heads helical scanning system - -
4 rotary heads helical scanning system -- --
Input Level: VIDEO IN Jack (Phono type) 1.0 Vp-p 75Ωunbalanced
Signal-to-Noise Ratio: SP: more than 43 dB
LP/SLP: more than 41 dB
Horizontal Resolution: Color/Monochrome: more than 230 lines
Head: Normal Mono: 1 stationary head
Input Level: AUDIO IN Jack (Phono type) -10 dBv 50kΩunbalanced
Frequency Response: Normal Mono: SP: 100 Hz ~ 8 kHz
LP: 100 Hz ~ 6 kHz
SLP: 100 Hz ~ 5 kHz
Signal-to-Noise Ratio: Normal Mono: SP: more than 42 dB
LP/SLP: more than 40 dB
Wow and Flutter: Normal Mono: SP Less than 0.2% WRMS
LP: Less than 0.3% WRMS
SLP: Less than 0.4% WRMS
Broadcast Channels: VHF 2 ~ 13, UHF 14 ~ 69
CATV Channels: Midband A through I (14 ~ 22)
Superband J through W (23 ~ 36)
Hyperband AA ~ EEE (37 ~ 64)
Lowband A - 5 ~ A - 1 (95 ~ 99)
Special CATV channel 5A (01)
Ultraband 65 ~ 94, 100 ~ 125
ITEM SPECIFICATION 123456
SPECIFICATIONS
Video
Audio
VCR
Tuner
Tape
Speed
Tape
Format
VCR
Picture
Tube
DISPLAY
Power
Television
System
Operating
Condition
Dimension
GENERAL
Weight and dimensions shown are approximate.
Specifications are subject to change without notice.
1. PV-M1327
2. VV1307/VV1317W
3. PV-M1347/PV-M1357W
4. PV-M2037
5. VV2007/VV2017W
6. PV-M2047
FM Radio Band
Renge

!WARNING
This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service
or repair the product or products dealt with in this service information by anyone else could result in serious injury or death.
MODEL MARK
PV-M1327 A
VV1307 B
VV1317W C
PV-M1347 D
PV-M1357W E
Use Marks shown in the chart below to distinguish the
different models included in this Service Manual.
SAFETY PRECAUTIONS................................................ 1-1
X-RADIATION.................................................................. 1-1
PREVENTION OF ESD TO ES DEVICES....................... 1-2
OPERATION GUIDE ....................................................... 1-3
SERVICE NOTES ............................................................ 1-7
IC, Transistor and Chip Part Information .................... 1-16
DISASSEMBLY/ASSEMBLY PROCEDURES
Disassembly/Assembly
Procedures of Cabinet Parts ..................................... 2-1
Disassembly/Assembly
Procedures of Mechanism ........................................ 2-7
Disassembly/Assembly
Procedures of Cassette Up Ass'y............................ 2-16
ADJUSTMENT PROCEDURES
Service Fixtures and Tools ......................................... 2-18
Mechanical Adjustment .............................................. 2-19
Electrical Adjustment .................................................. 2-26
Test Points and Control Location ............................... 2-34
SCHEMATIC DIAGRAMS
Schematic Diagram
and Circuit Board Layout Notes ................................ 3-1
Junction Schematic Diagram ........................................ 3-2
Stereo Amp Schematic Diagram .................................. 3-4
Main I (Power Supply/System Control
/Servo/Operation) Schematic Diagram ..................... 3-7
Main II (Signal Process/OSD
/Audio/Audio Amp) Schematic Diagram .................. 3-11
Main III (TV Y/C Process) Schematic Diagram .......... 3-15
Main IV (Power Supply) Schematic Diagram ............. 3-19
TV Stereo Schematic Diagram ................................... 3-19
TV Main Schematic Diagram ...................................... 3-23
CRT Schematic Diagram ............................................ 3-25
UHF/VHF Tuner/TV Demodulator
Schematic Diagram ................................................. 3-27
Head Amp Schematic Diagram .................................. 3-31
Interconnection Schematic Diagram........................... 3-37
CIRCUIT BOARD LAYOUT
Head Amp C.B.A. ......................................................... 4-1
TV Stereo C.B.A. .......................................................... 4-2
Stereo Amp C.B.A. ....................................................... 4-2
Junction C.B.A. ............................................................. 4-3
Main (Power Supply/Signal Process/OSD
/Audio/Audio Amp/TV Y/C Process
/System Control/Servo/Operation) C.B.A. ................. 4-4
TV Main C.B.A. ........................................................... 4-12
CRT C.B.A. ................................................................. 4-14
Signal Waveform ........................................................ 4-15
BLOCK DIAGRAMS
Power Supply Block Diagram ....................................... 5-1
Video Signal Path Block Diagram................................. 5-2
Audio Signal Path Block Diagram................................. 5-3
TV Stereo/Stereo Amp Block Diagram ......................... 5-5
System Control Block Diagram..................................... 5-7
Servo Block Diagram .................................................... 5-8
TV Y/C Process/OSD/CCV
/TV Main Block Diagram ......................................... 5-10
Troubleshooting Hints................................................. 5-13
EXPLODED VIEWS
1. Mechanism (Top) Section......................................... 6-1
2. Mechanism (Bottom) Section ................................... 6-2
3. Cassette Up Compartment Section .......................... 6-3
4. Chassis Frame Section (1) ....................................... 6-4
5. Chassis Frame Section (2) ....................................... 6-5
6. Packing Parts
and Accessories Section........................................... 6-6
REPLACEMENT PARTS LISTS
Before Replacing Parts, Read the Following ................ 7-1
Mechanical Replacement Parts List ............................. 7-2
Electrical Replacement Parts List ................................. 7-4
TABLE OF CONTENTS
MODEL MARK
PV-M2037 F
VV2007 G
VV2017W H
PV-M2047 I
NOT USED Z

1-1
EARTH GROUND
1500Ω. 10W
0.15µF
AC VOLTMETER
Hot-Check Circuit
TO
APPLIANCES
EXPOSED
METAL PARTS
GENERAL GUIDELINES
1. IMPORTANT SAFETY NOTICE
There are special components used in this equipment
which are important for safety. These parts are marked by
in the Schematic Diagrams, Circuit Board Layout,
ExplodedViewsandReplacementPartsList.Itisessential
that these critical parts should be replaced with
manufacturer's specified parts to prevent X-RADIATION,
shock, fire, or other hazards. Do not modify the original
design without permission of manufacturer.
2. AnIsolationTransformershouldalwaysbeusedduringthe
servicing of Combination VCR whose chassis is not iso-
lated from the AC power line. Use a transformer of ad-
equate power rating as this protects the technician from
accidentsresultinginpersonalinjuryfromelectricalshocks.
It will also protect Combination VCR from being damaged
by accidental shorting that may occur during servicing.
3. Whenservicing,observetheoriginalleaddress,especially
the lead dress in the high voltage circuits. If a short circuit
is found, replace all parts which have been overheated or
damaged by the short circuit.
4. Afterservicing,seetoitthatalltheprotectivedevicessuch
as insulation barriers, insulation papers, shield, and isola-
tion R-C combinations are properly installed.
5. Before turning the receiver on, measure the resistance
betweenB+lineandchassisground.Connect(-)sideofan
ohmmeter to the B+ lines, and (+) side to chassis ground.
Each line should have more resistance than specified, as
follows :
B+ Line Minimum Resistance
130V 1K ohm (Hot chassis ground)
27V 180 ohms (Cold chassis ground)
17V 110 ohms (Cold chassis ground)
6. When the TV set is not used for a long period of time,
unplug the power cord from the AC outlet.
7. Potentials, as high as 25.0KV (Model: A, B, C, D, E) or
30.0KV (Model: F, I) or 29.0KV (Model: G, H) are present
when this TV set is in operation. Operation of the TV set
without the rear cover involves the danger of a shock
hazardfromtheTVsetpowersupply.Servicingshouldnot
beattemptedbyanyonewhoisnotthoroughlyfamiliarwith
the precautions necessary when working on high voltage
equipment.Alwaysdischargetheanodeofthepicturetube
to the CRT ground of receiver before handling the tube.
8. After servicing make the following leakage current checks
to prevent the customer from being exposed to shock
hazards.
LEAKAGE CURRENT COLD CHECK
1. UnplugtheACcordandconnectajumperbetweenthetwo
prongs on the plug.
2. For physically operated power switches, turn power on.
Otherwise skip step 2.
3. Measuretheresistancevalue,withanohmmeter,between
the jumpered AC plug and each exposed metallic cabinet
partonthereceiver,suchasscrewheads,connectors,etc.
When the exposed metallic part has a return path to the
chassis, the reading should be between 1 M ohm and 12
M ohms. When the exposed metal does not have a return
path to the chassis, the reading must be infinity.
LEAKAGE CURRENT HOT CHECK
1. Plug the AC cord directly into the AC outlet.
Do not use a isolation transformer for this check.
2. Connect a 1.5K ohms, 10 watts resistor, in parallel with a
0.15 micro farad capacitor, between each exposed metal-
lic part on the set and a good earth ground , as shown in
Figure 1.
3. Use an AC voltmeter, with 1000 ohms/volt or more sensi-
tivity, to measure the potential across the resistor.
4. Check each exposed metallic part, and measure the volt-
age at each point.
5. ReversetheACplugintheACoutletandrepeateachofthe
above measurements.
6. Thepotentialatanypointshouldnotexceed0.75voltRMS.
A leakage current tester (Simpson Model 229 equivalent)
maybeusedtomakethehotchecks,leakagecurrentmust
not exceed 1/2 milliampere. In case a measurement is
outsideofthelimitsspecified,thereisapossibilityofshock
hazard,andthereceivershouldberepairedandrechecked
before it is returned to the customer.
Figure 1
X-RADIATION
WARNING :
1. The potential source of X-Radiation in TV sets is the High
Voltage section and the picture tube.
2. When using a picture tube test fixture for service, ensure
thatthefixture iscapableof handling25.0KV(Model: A,B,
C, D, E) or 30.0KV (Model: F, I) or 29.0KV (Model: G, H)
without causing X-Radiation.
NOTE :
It is important to use an accurate periodically calibrated
high voltage meter.
1. Reduce the brightness to minimum.
2. Set the SERVICE switch to SERVICE .
3. Measure the High Voltage. The meter reading should indi-
cate 23.5 +/- 1.5KV (Model: A, B, C, D, E) or 28.5 +/- 1.5KV
(Model: F, I) or 27.5 +/- 1.5KV (Model: G, H).
Ifthemeterindicationis outoftolerance,immediateservice
and correction is required to prevent the possibility of
premature component failure.
4. TopreventanX-Radiationpossibly,itisessentialtousethe
specified picture tube.
SAFETY PRECAUTIONS

1-2
IC5301
11
+
-
+
-R5505
R503
D503
C513 C5507
To Pin 6
of Flyback
Transformer
R5504
PREVENTION OF ELECTRO-
STATIC DISCHARGE (ESD) TO
ELECTROSTATICALLY
SENSITIVE (ES) DEVICES
Some semiconductor (solid state) devices can be damaged
easily by static electricity. Such components commonly are
called Electrostatically Sensitive (ES) Devices. Examples of
typicalESdevicesareintegratedcircuitsandsomefield-effect
transistors are semiconductor "chip" components. The follow-
ing techniques should be used to help reduce the incidence of
componentdamage caused byelectrostatic discharge (ESD).
1. Immediately before handling any semiconductor compo-
nent or semiconductor-equipped assembly, drain off any
ESD on your body touching a known earth ground. Alter-
natively, obtain and wear a commercially available dis-
charging ESD wrist strap, which should be removed for
potential shock reasons prior to applying power to the unit
under test.
2. After removing an electrical assembly equipped with ES
devices,placetheassemblyonaconductive surfacesuch
asaluminumfoil,topreventelectrostaticchargebuildupor
exposure of the assembly.
3. Useonlyagrounded-tipsolderingirontosolderorunsolder
ES devices.
4. Useonlyananti-staticsolderremovaldevice.Somesolder
removal devices not classified as "anti-static (ESD pro-
tected)" can generate electrical charge sufficient to dam-
age ES devices.
5. Do not use freon-propelled chemicals. These can gener-
ate electrical charges sufficient to damage ES devices.
6. DonotremoveareplacementESdevicefromitsprotective
packageuntilimmediatelybeforeyouarereadytoinstallit.
(Most replacement ES devices are packaged with leads
electrically shorted together by conductive foam, alumi-
num foil or comparable conductive material).
7. Immediately before removing the protective material from
theleadsofareplacementESdevice,touchtheprotective
material to the chassis or circuit assembly into which the
device will be installed.
CAUTION:
Be sure no power is applied to the chassis or circuit, and
observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged re-
placement ES devices. (Otherwise harmless motion such
asthe brushing togetherof yourclothes fabric orthe lifting
of your foot from a carpeted floor can generate static
electricity (ESD) sufficient to damage an ES device).
"NOTE to CATV system installer :
This reminder is provided to call the CATV system installer's
attention to Article 820-40 of the NEC that provides guidelines
forproper groundingand,in particular,specifies thatthe cable
ground shall be connected to the grounding system of the
building, as close to the point of cable entry as practical."
HORIZONTAL OSCILLATOR
DISABLE CIRCUIT TEST
SERVICE WARNING :
The test must be made as a final check before set is returned
to the customer.
1. With the rear cover removed, supply about a 120V AC
power source to the set, turn on the set.
2. Set the customer controls to normal operating positions.
3. ShortbetweenTP891andTP892ontheMaincircuitboard
with a jumper wire. Confirm that the picture goes out of
horizontal sync.
4. If this does not occur, the horizontal oscillator disable
circuit is not operating. Follow the Repair Procedures of
horizontal oscillator disable circuit before the set is re-
turned to customer.
REPAIR PROCEDURES OF
HORIZONTAL OSCILLATOR
DISABLE CIRCUIT
1. Connect a DC voltmeter between capacitor C513 (+) on
the Main circuit board and chassis ground.
2. If approximately +21.9V is not present at that point when
120V AC is applied, find the cause. Check R503, R5505,
C5507, C513 and D503.
3. Carefully check above specified parts and related circuits
and parts. When the circuit is repaired, try the horizontal
oscillator disable circuit test again.
CIRCUIT EXPLANATION
HORIZONTAL OSCILLATOR DISABLE
CIRCUIT
The positive DC voltage, supplied from the D503 cathode for
monitoringhighvoltage,isappliedtotheIC5301Pin11through
R503 and R5504. Under normal conditions, the voltage at
IC5301 Pin 11 is less than approx 3V. If the high voltage at
FlybackTrPin6exceedsthespecifiedvoltage,thepositiveDC
voltage which is supplied from the D503 cathode also in-
creases. The increased voltage is applied to IC5301 Pin11
through R503 and R5504. Due to the increased voltage at
IC5301 Pin11, the horizontal oscillator frequency increases,
the picture goes out of horizontal sync, the beam current
decreases and the picture becomes dark in order to keep X-
radiation under specification.
Figure 2

1-3

1-4

1-5

1-6

1-7
SERVICE MODE
2192
SERVICE MODE
0192
Any operation button
Press
Changes to "0"
Power is OFF. REW FF
+
Press (Over 3 seconds)
S-Tab SW. Data
• S-Tab SW. is off.
• S-Tab SW. is on.
Take Up and Supply Photo Sensor Data
• No light detected at either sensor.
• Take Up Photo Sensor detected at
beginning of tape.
• Supply Photo Sensor detected at end
of tape.
• Light detected at both sensors.
Present Mechanism Position Code
Mechanism Position is indicated.
(Refer to Fig. 1-4.)
Lock Code
• VCR is not in shut-off condition.
• Reel lock.
• Cylinder lock.
• Exceeds loading/unloading time.
(Mechanism Lock)
• Exceeds Cassette loading/unloading time.
(Cassette Lock)
Tape Unloading (direction)
Tape Loading (direction)
1
2
1
2
1
2
3
4
1
2
3
4
5
6
7
8
9
A
B
C
D
0
1
2
3
4
4
Explanation of Codes Code No.
SERVICE MODE
2192
TV Screen
Fault Code
• Cassette Down SW.
and S-Tab SW. Data
• Take Up Photo and
Supply Photo Sensor Data
• Present mechanism position code
• Lock code
Code Digit Position
Mechanism
position
EJECT REV PLAY/CUE/
SLOW/STILL FF/REWBRAKE
STOP/
STBY
CASSETTE
DOWN
position code
1 2 3 4 5 678 9 A B C D
Mode
Select SW.
REV STOP
EJECT ABC
FF/REW
BRAKE
LOAD UNLOAD
CASSETTE
DOWN
PLAY/CUE
/SLOW/STILL
1
D
2
B
9
75
6
8
A
C
4
3
SERVICE NOTES
Simplified Fault Finding Data
SimplifiedSelf-DiagnosticSystemfacilitatesfindingthecause
of the fault. 4 digit fault code will be displayed on TV screen.
The Simplified Fault finding data is stored in the Memory IC
(IC6004).Thisdataisclearedafteritisdisplayedandthen,the
POWER button is pressed back on.
1. With power turned off, press FF and REW buttons on unit
together for over 3 seconds.
Fig. 1-1
2. TV power goes on and the unit goes into service mode.
Fault code indication (4 digit number) will be displayed.
Fig. 1-2
Fig. 1-3
Fig. 1-4
Note:
When 1 to 4 listed in Lock code occurs, the VCR stops
and all VCR function buttons except for power become
non-operational.
3. Press any operation button except for POWER on either
the unit, or the remote to detect that a key has been
pressed.
The 1st digit changes to "0" only when key is detected.
Fig. 1-5

1-8
Service Position (1) Mechanism check
Mechanical adjustment
Electrical adjustment
Service Position (2) Main C.B.A. check
TV Main C.B.A. check
Service Position Purpose
Mechanism Chassis
and Cassette Up Ass'y
TV Main
C.B.A.
Main
C.B.A.
VCR Unit
TV
CAUTION:
HOT CIRCUIT
DO NOT
touch Power
curcuit during service.
It is not necessary to connect
Degaussing Coil Connector
Mechanism
Chassis and
Cassette Up
Ass'y
Stereo Amp C.B.A.
(Model: I)
VCR Unit
TV Main C.B.A.
Insulated material TV
It is not necessary to
connect Degaussing
Coil Connector
CAUTION:
HOT CIRCUIT
DO NOT
touch Power
curcuit during service.
open
Main C.B.A.
Service Position
The Basic Service Position does not require the use of Exten-
sion Cables. However, for more extensive servicing, Exten-
sion Cables should be used.
1. Basic Service Position
Service Position (1)
1. Remove Rear Cover, VCR Unit, (Stereo Amp C.B.A.:
Model I), and Top Shield Plate Ass'y.
2. Then, place VCR Unit as shown.
Fig. 2-1
CAUTION:
HOT CIRCUIT (Primary circuit) exists on the Main
C.B.A. and TV Main C.B.A.
Use extreme care to prevent accidental shock when
servicing.
Note:
When disassembling/assembling, refer to "Disassembly/
Assembly Procedures of Cabinet" section.
Service Position (2)
1. Remove Rear Cover, VCR Unit, (Stereo Amp C.B.A.:
Model I), and Top Shield Plate Ass'y.
2. Place VCR Unit as shown.
InordertostabilizeVCRUnit,placeitonaslantedsupport,
such as a loose-leaf binder etc.
Fig. 2-2

1-9
Alignment
Projection
Mode Select SW. on Main C.B.A.
SERVICE
Rotate
Extension
Cable -1
Mode Select SW. Ass'y
Extension Cable -2 Full Erase Head
Connector
Mode Select
SW. Connector
(Foil Side)
P3501
P6201
P6002
Keep away these cables from
TV Main C.B.A. as possible.
Safety Tab SW.
P4001
Main C.B.A.
P3003
Frame
tape
tape
tape
masking tape
TV
TV Main C.B.A.
Mechanism
Chassis and
Cassette Up Ass'y
It is not necessary to connect
Degaussing Coil Connector
CAUTION:
HOT CIRCUIT
DO NOT
touch Power
curcuit during service.
2. Service Position with Extension Cable Kit
In Service Position with Extension Cable Kit, mechanism check from the Bottom Side of Mechanism Chassis and Capstan Stator
Unit (Capstan Motor Drive, Loading Motor Drive Circuit) check with power on condition can be performed.
Fig. 3-1
CAUTION:
HOT CIRCUIT (Primary circuit) exists on the Main C.B.A. and TV Main C.B.A.
Use extreme care to prevent accidental shock when servicing.
Note:
When disassembling/assembling, refer to "Disassembly/Assembly Procedures of Cabinet" section.
Service Position

1-10
Extension Cable -1:
Extension Cable -2:
Mode Select SW. Ass'y:
Full Erase Head Connector on the
Mechanism Chassis Unit ~ P4001
on the Main C.B.A.
Note: No change in performance if
pins are reversed.
P3501 on the Head Amp C.B.A.
~ P3003 on the Main C.B.A.
a) 3 Clip-on Wires ~ Mode Select SW.
Connector on the Main C.B.A.
1 Pin (Not Used)
Red Wire ~ 2 pin
Orange Wire ~ 3 pin
Yellow Wire ~ 4 pin
b) 8 Pin Connector ~ P6002 on the
Main C.B.A.
c) 14 Pin Connector ~ P6201 on the
Main C.B.A.
d) Set Mode Select SW. on the Mode
Select SW. Ass'y to EJECT position
and install onto Mechanism Chassis.
P2531
P2552
P3501
Head Amp C.B.A.
Shaft of Main
Cam Gear
Extension Cable -2
Extension Cable -1
Full Erase
Head Connector
Mode Select SW. Ass'y
See 3 Clip-on
Wires connection
Alignment
Projection
EJECT
Position
Mode Select SW.
on Mode Select
SW. Ass'y
SERVICE
Rotate
IC6001 Main C.B.A.
(Component Side)
3 Clip-on Wires connection
(Foil Side)
Mode Select SW.
Red
Orange
2134
Yellow
Not Used
Extension Cable -2
(VUVS0005) for 2 Head Model
Mode Select SW. Ass'y
(VUVS0001)
8 pin
3 clip-on
wires
14 pin
2 pin
12 pin 15 pin
20 pin
Extension Cable -2
(VUVS0004) for 4 Head Model
Extension Cable -2
(VUVS0003) for Hi-Fi Model
Extension Cable -1
(VUVS0002)
How to place the unit into Service Position with
Extension Cables
1. Remove Rear Cover, VCR Unit, (Stereo Amp C.B.A.:
ModelI),TopShieldPlateAss'y, MechanismChassis,and
Cassette Up Ass'y.
2. Connect the Extension Cables as follows:
Extension Cable Kit (VUZS0002)
Fig. 3-2
Note:
3 types of Extension Cable -2 are included in this kit. Since
thereis a differencein thenumberof P3501Head AmpC.B.A.
pinsbetween2Head,4Head,andHi-Fimodels,besuretouse
the proper cable.
3. Place the VCR Unit as shown in Fig. 3-1.
4. Secure the Extension Cables with tape as shown
in Fig. 3-1. When recording, cover the Safety Tab SW. with
masking tape to turn this SW. on.
Note:
To avoid damaging the connectors on Main C.B.A., it is
necessary to secure connectors with tape as shown in
Fig. 3-1.
5. Set Mode Select SW. on the Main C.B.A. to Service
Position.
6. Plug the AC plug into an AC outlet.
7. Insert a cassette.
The power comes on, the tape is fully loaded, and the unit
goes into the STOP Mode.
8. PlaceajumperbetweenTP6001andGNDtoplacetheunit
in Service Mode.
9. Check and/or repair the unit.
10. Press the STOP/EJECT button to eject the cassette.
Note:
When inserting a cassette again, remove the jumper
betweenTP6001andGNDandinsertthecassette.Then,
reconnect the jumper.
11. After servicing, remove the jumper between TP6001 and
GND to release the unit from Service Mode.
Note:
When disassembling/assembling, refer to "Disassembly/
Assembly Procedures of Cabinet" section.
Fig. 3-3

1-11
slide
Slot
Screw (A)
Drive Rack
Unit
Main Cam Gear
Guide Tab
pull
Spring (A)
Drive Rack Arm
Rear Side View
Opener
Piece
Pinch Arm
Unit
Main Cam Gear
Locking
Tabs (A)
Pin of Pinch Arm Unit
Main Cam Gear
Pinch
Roller
Shaft of Capstan
Rotor Unit
Pinch
Arm Unit
Groove
Opener Piece
Pull Up
How to Remove a jammed Tape
Manual Method
When a tape jam is encountered, check the tape loading
condition and use the following procedure to remove a tape
jam.
Fig. 4-1
Method -1:
1. While releasing 2 Locking Tabs (A) of Opener Piece, pull
the Opener Piece up as far as you can.
2. MovethepinofPinchArmUnitoutofthegrooveoftheMain
Cam Gear so that the Pinch Roller is separated from the
shaft of the Capstan Rotor Unit.
Fig. 4-2
3. Remove the tape from the tape path.
4. Rewind the tape into the cassette by rotating the Center
Clutch Unit counterclockwise.
5. Unhook Spring (A) of the Drive Rack Unit.
6. Remove Screw (A).
7. Lift the Drive Rack Unit up so that the slot clears the guide
tab.WhilepullingtheDriveRackUnitoutfarenoughsothat
it clears the Drive Rack Arm,.slide the Drive Rack Unit as
indicatedbythearrowtoremovethecassettetapefromthe
Cassette Up Ass'y.
9. Check the cause of mechanical trouble and repair.
Fig. 4-3
Method -2:
1. Rotate Main Cam Gear clockwise with needlenose pliers,
etc. so that the Pinch Roller is separated from the shaft of
the Capstan Rotor Unit.
2. Perform Step 3 through Step 8 of Method -1.
Method -3:
1. Perform Step 3 through Step 8 of Method -1.
Note:
Afterrepairingmechanical trouble,makesure thatallgear
alignments are correct, especially the Wiper Arm Unit and
Drive Rack Unit of Cassette Up Ass'y.
Pinch Roller is up
against Capstan Rotor
Unit shaft
Method 3
Method 1Method 2
No
No
Yes
Yes
Main Cam Gear can
be rotated

1-12
DC Power Supply
(+10.0VDC)
J6005 J6004
-
+
a
b
Main C.B.A.
Motor P.C.B.
TV Main C.B.A.
Main C.B.A.
J6004
J6005
-
+
+
P2552
Unsolder
Chassis
Motor P.C.B of
Motor Block Ass'y
Rear Side View
-
P2551
DC Power Supply
(+10VDC)
"a"
"c" "b"
"a" "b"
Method -2:
1. LocatetheJumper(J6004)onthe System ControlSection
of the Main C.B.A. and cut it near the center.
Fig. 5-2
2. Apply +10.0VDC Power Supply to the jumpers. When the
Loading Posts reach the fully unloaded position, remove
the Power Supply.
Note:
BecarefulnottolettheDCPowerSupplyUnitGNDcontact
the chassis GND. This may damage the Loading Motor
Drive IC (IC 2501).
Be sure to apply DC + to Portion "a" of J6004.
IfDC+isappliedtoPortion"b"ofJ6004,theLoadingMotor
Drive IC (IC2501) may be damaged.
Fig. 5-3
4. Rewind the tape into the cassette by turning the Center
Clutch Unit counterclockwise.
5. Eject the cassette by applying +10.0VDC Power Supply
again.
6. After completing the removal procedure, resolder Jumper
(J6004).
Electrical Method
Electricalmethodcanonlybeperformedwhenthemechanism
is moved by rotating the Main Cam Gear.
CAUTION:
If loading dose not start in approx. 2 seconds after DC
Power Supply is applied, DO NOT continue to apply DC
Power Supply. Instead, perform "Manual Method."
Method -1:
1. Removethesolderasshownand apply+10.0VDCPower
Supply (DC + to Portion "a," DC - to Portion "c").
2. WhentheLoadingPostsreachthefullyunloadedposition,
remove the Power Supply.
Fig. 5-1
Note:
BecarefulnottolettheDCPowerSupplyUnitGNDcontact
the chassis GND. This may damage the Loading Motor
Drive IC (IC 2501).
Be sure to apply DC + to Portion "a" of Motor P.C.B.
IfDC+isappliedtoPortion "b",theLoadingMotorDriveIC
(IC2501) may be damaged.
4. Rewind the tape into the cassette by turning the Center
Clutch Unit counterclockwise.
5. Eject the cassette by applying +10.0VDC Power Supply
again.
6. Aftercompletingtheremovalprocedure, solderPortion"a"
and Portion "b."

1-13
CRT C.B.A.
Clamper
Degaussing Coil Connector
Clamper
P354
Note:
No lead wires or flat cables should touch
any heating parts or the Heat Sink Plate of
IC451, IC801, or Q551.
(Model : A, B, C, D, E) (Model : F, G, H)
(Model : I)
TV Main
C.B.A.
VCR Main
C.B.A.
CRT C.B.A.
Clamper
Deflection
Yoke
Connector
P1002
P4591
Flyback
Transformer
Degaussing Coil Connector
Clamper
Clamper
Clamper
Clamper
Frame
Anode Cap
Deflection Yoke
P354
Degaussing Coil
Grounding Wire
PK3 PK2
PK1
Clamper
45°
+
-
Red
White
Speaker-R
TV Main
C.B.A.
VCR Main
C.B.A.
Deflection
Yoke
Connector
P1002
P4591
Flyback
Transformer
Clamper
Clamper
Clamper
Frame
Anode Cap
Deflection Yoke
Degaussing Coil
Grounding Wire
PK3 PK2
PK1
Clamper
45°
+
-
Red
White
Speaker-R
TV Main
C.B.A.
VCR Main
C.B.A.
Deflection
Yoke
Connector
P1002
P4592
P4605
P4602
P4301
P4604
Flyback
Transformer
Clamper
Clamper
Clamper
Frame
TV Stereo C.B.A.
Stereo Amp C.B.A.
Anode Cap
Deflection Yoke
Degaussing Coil
Grounding Wire
PK3 PK2
PK1
Clamper
45°
+
-
Red
White Red White
Speaker -R Speaker -L
+
-
P4601
CRT C.B.A.
Clamper
Degaussing Coil Connector
Clamper
P354
(Model: G, H) (Model: F)
Wire and Lead position Diagram
After servicing, make sure that all wires and leads are placed
intheiroriginalposition. Itisimportantforthe bestoperationof
the unit.
Fig. 6

1-14
Tweezers
Solder
Soldering Iron
Soldering Iron
Presolder
Tweezers
Chip
Soldering Iron
Cylinder Rotation in STOP mode
Thecylinderwillcontinue torotateforapproximately 5minutes
after the STOP button is pressed in Play mode etc. Eject the
tape in order to stop the cylinder.
Black Screws on the Chassis
Black Screws are used on the Mechanism Chassis to identify
screws that require adjustment.
Variable Voltage Isolation Transformer
An Isolation Transformer should always be used during the
servicing of Combination VCR whose chassis is not isolated
from the AC power line. Use a transformer of adequate power
ratingasthisprotectsthetechnicianfromaccidentsresultingin
personal injury from electrical shocks. It will also protect Com-
bination VCR from being damaged by accidental shorting that
may occur during servicing.
Also, when troubleshooting the above type of Power Supply
Circuit, a variable isolation transformer is required in order to
increase the input voltage slowly.
Special Note
All integrated circuits and many other semiconductor devices
areelectrostatically sensitive and therefore require the special
handling techniques described under the
"ELECTROSTATICALLYSENSITIVE(ES)DEVICES"section
of this service manual.
ReplacementProcedureforLeadless(Chip)
Components
Thefollowingproceduresarerecommendedforthereplacement
of the leadless components used in this unit.
1. Preparation for replacement
a. Soldering Iron
Useapencil-typesolderingironthatuseslessthan30
watts.
b. Solder
EutecticSolder(Tin63%,Lead37%)isrecommended.
c. Soldering time
Do not apply heat for more than 4 seconds.
d. Preheating
Leadless capacitor must be preheated before
installation. – (266°F ~ 302°F)
(130°C ~150°C) for about two minutes.
Note:
a. Leadless components must not be reused after
removal.
b. Excessive mechanical stress and rubbing of the
component electrode must be avoided.
2. Removing the leadless component
Grasp the leadless component body with tweezers and
alternatelyapply heat to bothelectrodes. When thesolder
onboth electrodesis melted,remove theleadless compo-
nent with a twisting motion.
Note:
a. Donotattempttolift thecomponentofftheboard until
the component is completely disconnected from the
board by a twisting action.
b. Be careful not to break the copper foil on the printed
circuit board.
Fig. 7-1
3. Installing the leadless component
a. Presolder the contact points on the circuit board.
Fig. 7-2
b. Press the part downward with tweezers and solder
both electrodes as shown below.
Fig. 7-3
Note:
Donotgluethereplacementleadlesscomponenttothe
circuit board.

1-15
Portion "a"
Top Plate
Tab
Lever Lever
Hole Hole
Holder Unit
Tab
Slide
Load
Unload/Eject
Main Cam Gear
Needlenose Pliers
PV-M1327
VV1307
VV1317W
PV-M1347
PV-M1357W
PV-M2037
VV2007
VV2017W
PV-M2047
Not Used
A
B
C
D
E
F
G
H
I
Z
MODEL MARK
Note:
Refer to Item 5 of Schematic Diagrams and Circuit
Board Layout Notes, for mark "Z."
Model No. Identification Mark
Use Marks shown in the chart below to distinguish the
different models included in this Service Manual.
Hot Circuit
Primary circuit exists on the Main C.B.A. and TV Main C.B.A.
This circuit is identified as "HOT" on the C.B.A. and in the
ServiceManual.Useextremecaretopreventaccidentalshock
when servicing.
Service Mode
In order to inhibit detection of the Supply & Takeup Photo
Transistors, Reel Sensor, and Cylinder Lock, place a jumper
between TP6001 and GND.
In this mode, Mechanism movement can be confirmed. When
removingCassetteUp Ass'yorloadingmecanism manually,it
can be confirmed without a cassette.
To release from this mode, remove the jumper between
TP6001 and GND.
Defeating the Auto Tracking
To defeat the Auto Tracking Function, place the instrument in
the STOP mode and place a jumper between TP6003 and
TP6009 on the Main C.B.A. The tracking will be placed in the
neutral position.
How to set Tracking to the Neutral Position
Ejectingthecassettetape andthen,reinsertingitwill resetthe
tracking to the Neutral position.
How to reset all Combination VCR Memory
functions
To reset (clear) the select language, channel auto set and set
clockfunctionstotheirinitialpoweroncondition(poweron,no
cassetteinserted),holddownthePLAYandREWINDbuttons
on the unit together for more than 5 seconds.
Power will shut off.
Method for Manual Loading / Unloading of
Mechanism
Turn the Main Cam Gear counterclockwise (for loading) or
clockwise (for unloading) using needlenose pliers etc.
Fig. 8-1
When loading without a cassette, press Portion "a" on both
sidesoftheHolderUnitofCassetteUpAss'y so thatthe Lever
clears Tab and Hole.
Fig. 8-2

1-16
IC, TRANSISTOR AND CHIP PART INFORMATION
GENERAL C.B.A./ASS'Y PARTS
VCR MAIN C.B.A.
A 2SB709
N9 MA372J
X1 IMX1
MARKING PART NO. MARKING PART NO.
HOW TO READ THE IDENTIFICATION MARK OF
CHIP COMPONENTS. HOW TO READ THE VALUES OF THE
CYLINDRICAL TYPE CHIP COMPONENTS.
The widest color band must be read first for
value.
(a) RESISTOR
There are two types (ERD10LLJ... and ERD10TLJ...) of
chip parts.
1) ERD10LLJ : Refer to above type.
2) ERD10TLJ : The narrow color band must be read
first for value.
If this part is included in the parts list, be sure that the
color band is read properly when servicing.
(b) CAPACITOR
Because of the width of the color bands, the reading
direction cannot be specified. However, the color band
can be read on either side. Be sure to confirm the value
using the schematic diagram.
CAUTION :
Once chip parts are removed, they must not be reused.
Always use a new part when installing a chip part.
1st 2nd 3rd
BE
C
1
CRT C.B.A.
1
TV STEREO C.B.A.
E
BC
LA7837
2SD1555LBMTV,
2SD2499LBMA
STR30130
2SC3063
AN7420
1
2SD601, 2SD601A,
2SB709
TV MAIN C.B.A.
ECB
E
BC
2SD2375, 2SC3852,
2SC4533LP.KT,
2SC5130LF608
12
4
3
ECB
AN5265,
AN3809K
1
ON3131-R.KT
2SC945A, 2SA733,
2SC1473
AN5367FB,
AN3475FBP,
MN675058A5P2
1
BE
C
C
E
BR1
R2
UN2213(R1=47K, R2=47K),
UN2212(R1=22K, R2=22K),
UN2215
(R1=10K, R2=OPEN)
C
E
BR1
R2
ECB
DTA143ES
(R1=47K, R2=OPEN),
DTA144ES
(R1=47K, R2=47K)
T4101,
VLTS0304
14
UPC4570C,
MN3885S,
AN3361SB,
AN3371SB
1
LC8643125957,
TC4053BP,
24LC01B/PS1
1
2SD1458, 2SD636,
2SB641, 2SD2259
BE
C
C
E
BR1
R2
UN2112(R1=22K, R2=22K),
UN2115
(R1=10K, R2=OPEN)
B2 E2
C1
E1 C2
B1
B1
E1
C2
E2
B2
C1
IMX1
E
BC
2SC2653H
EB
C
VCRS0214
1
6B UN2112
8C UN2213
8C
MARKING
UN2213
C
BE
X1
MARKING
IMX1
C1
E1 B1
E2
C2
B2
A
MARKING
2SB709
C
BE
Q
hfe classification

2-1
Rear Cover
2
CRT Unit
4
VCR Unit
3
Mechanism Chassis
11
Cassette Up Ass'y 10
Main C.B.A.
9
TV Main C.B.A.7
Swivel Unit
1
VCR Chassis Unit
8
Stereo Amp C.B.A.5
(Model: I)
(Model: A, D, E)
Top Shield
Plate Ass'y
6
DISASSEMBLY/ASSEMBLY
PROCEDURES
DISASSEMBLY/ASSEMBLY
PROCEDURES OF CABINET
Disassembly Flowchart
Perform all disassembly procedures in the order described in
the"DisassemblyFlowchart"shownbelow.Whenreassembling,
use the reverse procedure.
CAUTION:
Disconnect AC plug before disassembly.
Fig. D1
Swivel Unit (Model: A, D, E)
Disassembly Procedure
1. While pushing one of the Locking Tabs (A) outward, pull
that portion of the Swivel Unit free from the unit.
2. Repeat step 1 for other Locking Tabs (A) to remove the
Swivel Unit.
Fig. D2
Bottom View Locking Tabs (A)
Locking Tabs (A)
1 Swivel Unit

2-2
TV CRT C.B.A.
Anode Cap
P354
Deflection
Yoke
Connector
Main
C.B.A.
TV Main C.B.A.
Clampers
Degaussing
Coil Connector
P4591
(Model : A, B,
C, D, E, F, G, H)
P4605
(Model : I) Stereo Amp
C.B.A.
(Model : I)
P4604
(Model : I)
Clamper
CRT Unit
3 VCR Unit
VCR Unit
Disassembly Procedure
1. DischargetheAnodetotheCRTGround.Then,removethe
Anode Cap.
2. Disconnect the Connector P354 from the CRT C.B.A.
3. Carefully pull out the CRT C.B.A. from the CRT Unit.
4. Disconnect the Deflection Yoke Connector and the
Degaussing Coil Connector from the Main C.B.A.
5. (Model : A, B, C, D, E, F, G, H )
Disconnect the Connector P4591 on the Main C.B.A. and
remove the leads from the clampers.
(Model : I )
Disconnect 2 Connectors P4604 and P4605 on the Stereo
Amp C.B.A. and remove the leads from the clampers.
Fig. D4-1
6. (Model: A, B, C, D, E)
Slightly lift up the rear side of the VCR Unit to release Tabs
(B).
(Model: F, G, H, I)
Slightly lift up the rear side of the VCR Unit to release Tabs
(B) and (C).
7. Slide the VCR Unit out as far as it will go.
Then, lift up the VCR Unit to release 3 Guide Tabs (A) and
remove the VCR Unit all the way out from the TV cavity.
Rear View Screws (A)
Screws (A)
2 Rear Cover
(Model: F, G, H, I)
Rear View
(Model: A, B, C, D, E)
Screws (A)
Screws (A)
2 Rear Cover
Rear Cover
Disassembly Procedure
Remove 7 Screws (A). Then, pull the Rear Cover away.
Fig. D3-1
Fig. D3-2