Panasonic PV-M1348 User manual

©1998 Matsushita-Kotobuki Electronics Industries LTD.
All rights reserved. Unauthorized copying and distribution
is a violation of law.
Combination-VCR
ORDER NO. MKS9801M321
B3, B6
PPV-M1348
PPV-M1358W
Q
VV1308
QVV1318W
PPV-M1368
P
PV-M1378W
PPV-M2038
PPV-M2048
Q
VV2008
QVV2018W
PPV-M2058
® ®
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. 5 watts (power off) ---
Approx. 110 watts (power on), Approx. 5 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 15-3/16"(385mm) (H) X 16-11/16"(424mm) (D) ---
20-5/16"(515mm) (W) X 19-7/8"(505mm) (H) X 19-1/16"(484mm) (D) ---
26.4 lbs. (12 kg) ----
26.0 lbs. (12 kg) -----
50.6 lbs. (23 kg) --- -
51 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.
Designs and specifications are subject to change without notice.
1. PV-M1348/PV-M1358W
2. VV1308/VV1318W
3. PV-M1368/PV-M1378W
4. PV-M2038/PV-M2048
5. VV2008/VV2018W
6. PV-M2058
FM Radio Band
Range

MODEL MARK
PV-M1348 A
PV-M1358W B
VV1308 C
VV1318W D
PV-M1368 E
PV-M1378W F
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 .................... 1-21
DISASSEMBLY/ASSEMBLY PROCEDURES
Disassembly/Assembly
Procedures of Cabinet Parts ..................................... 2-1
Disassembly/Assembly
Procedures of Mechanism ........................................ 2-6
Disassembly/Assembly
Procedures of Cassette Up Ass'y............................ 2-16
ADJUSTMENT PROCEDURES
Service Fixtures and Tools ......................................... 2-18
Mechanical Adjustment .............................................. 2-19
Electrical Adjustment .................................................. 2-25
Test Points and Control Location ............................... 2-35
SCHEMATIC DIAGRAMS AND CIRCUIT BOARD LAYOUT
Schematic Diagram
and Circuit Board Layout Notes ............................ 3-1
Schematic Diagrams .................................................. 3-2
Main I (Power Supply/System Control
/Servo) Schematic Diagram ...................................... 3-2
Main II (Signal Process/OSD
/Audio Amp) Schematic Diagram .............................. 3-4
Main III (TV Y/C Process) Schematic Diagram ............ 3-6
Main IV (Power Supply) Schematic Diagram ............... 3-8
Main V (Operation) Schematic Diagram ..................... 3-10
Capstan Stator/Junction/Loading Motor
/Audio Control Head Schematic Diagram ............... 3-14
TV Main/CRT Schematic Diagram ............................. 3-16
TV Stereo Schematic Diagram ................................... 3-18
Stereo Amp Schematic Diagram ................................ 3-20
Head Amp Schematic Diagram .................................. 3-22
Interconnection Schematic Diagram........................... 3-26
Signal Waveform ........................................................ 3-27
Voltage Chart.............................................................. 3-31
CIRCUIT BOARD LAYOUT ......................................... 4-1
Main (Power Supply/Signal Process/OSD
/Audio Amp/TV Y/C Process/System Control
/Servo/Operation) C.B.A. (A,B,E,F,G,H,K) ................ 4-1
Main (Power Supply/Signal Process/OSD
/Audio Amp/TV Y/C Process/System Control
/Servo/Operation) C.B.A. (C,D,I,J) ............................ 4-5
TV Main C.B.A. ............................................................. 4-9
TV Stereo C.B.A. ........................................................ 4-11
Stereo Amp C.B.A. ..................................................... 4-11
CRT C.B.A. ................................................................. 4-12
Head Amp C.B.A. ....................................................... 4-13
Capstan Stator Unit .................................................... 4-15
Junction C.B.A. ........................................................... 4-15
Loading Motor P.C.B. ................................................. 4-16
Audio Control Head P.C.B. ......................................... 4-16
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
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-M2038 G
PV-M2048 H
VV2008 I
VV2018W J
PV-M2058 K
NOT USED Z
!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.

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, F) or
(30.0KV: Model G, H, K) or (29.0KV: Model I, J) are
present when this TV set is in operation. Operation of the
TV set without the rear cover involves the danger of a
shock hazard from the TV set power supply. Servicing
should not be attempted by anyone who is not thoroughly
familiar with the precautions necessary when working on
high voltage equipment. Always discharge the anode of
the picture tube 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)
may be used to make the hot checks. Leakage current
must not exceed 1/2 milliampere. In case a measurement
is outside of the limits specified, there is a possibility of
shock hazard, and the receiver should be repaired and
rechecked 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
thatthefixtureiscapableofhandling(25.0KV:ModelA,B,
C,D, E, F)or(30.0KV: Model G, H,K)or (29.0KV: Model
I, J) 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, F) or (28.5 +/-
1.5KV: Model G, H, K) or (27.5 +/- 1.5KV: Model I, J).
Ifthemeterindicationis out oftolerance,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 5
of Flyback
Transformer
R5504
PREVENTIONOFELECTRO-
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 by electrostatic 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. Useonlyan antistaticsolderremoval device.Somesolder
removal devices not classified as "antistatic (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 your clothesfabric or thelifting
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
FlybackTrPin5exceedsthespecifiedvoltage,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"
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
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 (See Note)
• 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
Power is OFF. REW FF
+
Press (Over 3 seconds)
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
Mechanism Chassis
and Cassette Up Ass'y
CAUTION:
HOT CIRCUIT
DO NOT
touch
Power circuit
during service.
VCR Unit
TV Main C.B.A.
Insulated material
TV
It is not necessary to
connect Degaussing
Coil Connector
open
Main C.B.A.
Stereo Amp C.B.A.
(Model: K)
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
circuit during service.
It is not necessary to connect
Degaussing Coil Connector
Stereo Amp C.B.A.
(Model: K)
Insulated material
Insulated
material
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
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 K), and Top Shield Plate Ass'y.
2. Then, place VCR Unit and (Stereo Amp C.B.A.: Model K)
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 K), and Top Shield Plate Ass'y.
2. Place VCR Unit and (Stereo Amp C.B.A.: Model K) 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
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
circuit during service.
Stereo Amp C.B.A.
(Model: K)
Insulated
material
Insulated
material
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. 2-3
Service Position
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.

1-10
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
TP6021 TP6022
TP6023
Main C.B.A.
(Component Side)
3 Clip-on Wires connection
Mode Select SW.
Red
Orange
Yellow
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 ~ Test Points
on the Main C.B.A.
Red Wire ~ TP6021
Orange Wire ~ TP6022
Yellow Wire ~ TP6023
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
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.:
Model K), Top Shield Plate Ass'y, Mechanism Chassis,
and Cassette Up Ass'y.
2. Connect the Extension Cables as follows:
Fig. 2-5
Extension Cable Kit (VUZS0002)
Fig. 2-4
Note:
3 types of Extension Cable -2 are included in this kit. Since
thereis a differencein thenumber of P3501Head AmpC.B.A.
pinsbetween2Head,4Head,andHi-Fimodels,besuretouse
the proper cable.

1-11
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
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
circuit during service.
Stereo Amp C.B.A.
(Model: K)
Insulated
material
Insulated
material
Service Position
3. Place the VCRUnit and (Stereo AmpC.B.A.: Model K)as
shown.
4. Secure the Extension Cables with tape as shown. 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.
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
between TP6001 and GND and insert the cassette. Then,
reconnect the jumper.
Fig. 2-6
11. After servicing, remove the jumper between TP6001 and
GND to release the unit from Service Mode.
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.

1-12
SUB COLOR
SUB TINT
SUB BRIGHT
CONTRAST
SUB SHARPNESS
R CUT -OFF
G CUT -OFF
B CUT -OFF
G DRIVE
B DRIVE
SUB CONTRAST
H CENTER
V POSITION
V SIZE
DOT CLOCK
ANR CTL
PICTURE CTL
VV COLOR
VV TINT
VV SHARPNESS
PG SHIFTER
C0 – FF, 00 – 3F
E0 – FF, 00 – 1F
C0 – FF, 00 – 3F
C1 – FF, 00
E0 – FF, 00 – 1F
00 – 7F
00 – FF
00 – FF
00 – 7F
00 – 7F
00 – 0F
00 – 0F
00 – 06
00 – 7F
00 – 7F
00 – EF
00 – EF
C0 – FF, 00 – 3F
E0 – FF, 00 – 1F
E0 – FF, 00 – 1F
01 – FD
Control functions
Memory IC Reference Table
Range Default
00
00
F0
00
F0
1E
3C
3C
40
40
06
08
00
40
34
87
84
00
00
E8
80
Address
00
01
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
10
11
12
13
14
15
Note:
Address is not displayed on the TV screen.
Other Addresses except above are not used.
SUB COLOR SUB COLOR 00
Set
FF
SUB COLOR FF
Control
Function Value to be
set
Opener Lever
Cassette Door Tab
View "A" Cassette Door-Lid
Cassette Door-Lid
VCR Unit
View "A"
Press
CAUTION
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
removing Cassette Up Ass'y, it can be confirmed without a
cassette.
To release from this mode, remove the jumper between
TP6001 and GND.
INSTALLATION OF VCR UNIT CAUTION
1. Swing the Cassette Door -Lid all the way open until the
Cassette Door tab clears the Opener Lever.
2. Make sure that all guide tabs are aligned properly. Then,
press the VCR Unit straight in.
Fig. 4
HOW TO INITIALIZE MEMORY IC
After the Memory IC (IC6004) or MainC.B.A. is replaced, be
sure to set the Default value to Memory IC as shown in
"Memory IC Reference Table" below.
1. PressandholdSTOP,FF,andVOLDOWNbuttonsonthe
unit together over 5 seconds with no cassette inserted.
The adjustment overlay will appear to Enter EVR Adjust-
ment mode.
Fig. 3-1
2. SettheDefaultvalueofallControlfunctionsusingaremote
control as shown in "Memory IC Reference Table" below.
Note:
ForSelectingControlfunctionsandsettingDefaultvalue,
refer to "How to Enter EVR Adjustment Mode" and "How
to Enter EVR PG Shifter Adjustment Mode" in Electrical
Adjustment procedures.
Fig. 3-2
3. PressandholdSTOP,FF,andVOLDOWNbuttonsonthe
unit together over 5 seconds again or press the POWER
button OFF to release EVR Adjustment Mode.
The Default value will be written to Memory IC (IC6004).
4. Perform all EVR Adjustments. (Refer to "EVR Adjustment
with the Remote Control" in Electrical Adjustment proce-
dures.)

1-13
Portion "a"
Top Plate
Tab
Lever Lever
Hole Hole
Holder Unit
Tab
Slide
+
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"
Load
Unload/Eject
Main Cam Gear
Needlenose Pliers
METHOD FOR LOADING/
UNLOADING OF MECHANISM
(Manual Method)
Turn the Main Cam Gear counterclockwise (for loading) or
clockwise (for unloading) using needlenose pliers etc.
Note:
Donotuse thismethodifMechanismis jammedorlocked.
Fig. 5-1
(Electrical Method)
Remove the solder as shown and apply +10.0 VDC Power
Supply (DC + to Portion "a," DC - to Portion "c").
Note:
Be careful not to let the DC Power Supply Unit GND contact
thechassisGND.ThismaydamagetheLoadingMotorDrive
IC (IC 2501).
Be sure to apply DC + to Portion "a" of Motor P.C.B.
If DC + is applied to Portion "b", the Loading Motor Drive IC
(IC2501) may be damaged.
Fig. 5-2
Note:
Do not forget to solder Portions "a" and "b" after loading/
unloading operation is completed.
When loading without a cassette, press Portion "a" on
both sides of the Holder Unit of Cassette Up Ass'y so that
the Levers clear the Tabs and Holes.
Fig. 5-3

1-14
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
Pinch Roller is up
against Capstan Rotor
Unit shaft
Method 3
Method 1Method 2
No
No
Yes
Yes
Main Cam Gear can
be rotated
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. 6-1
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. 6-2
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.
8. Check the cause of mechanical trouble and repair.
Fig. 6-3
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. (Refer to "EJECT
Position confirmation" in Disassembly/Assembly Proce-
dures of Mechanism.)

1-15
+
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"
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
-
+
Method -2:
1. Locate the Jumper (J6004) on the Audio Amp Section of
the Main C.B.A. and cut it near the center.
Fig. 7-2
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. 7-3
3. Rewind the tape into the cassette by turning the Center
Clutch Unit counterclockwise.
4. Eject the cassette by applying +10.0VDC Power Supply
again.
5. After completing the removal procedure, resolder Jumper
(J6004).
Electrical Method
Electricalmethodcanonlybeperformedwhenthemechanism
is moved by rotating the Main Cam Gear.
CAUTION:
If loading does 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. 7-1
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.
3. Rewind the tape into the cassette by turning the Center
Clutch Unit counterclockwise.
4. Eject the cassette by applying +10.0VDC Power Supply
again.
5. Aftercompletingtheremovalprocedure, solderPortion"a"
and Portion "b."

1-16
CRT C.B.A.
Clamper Clamper
P354
TV Main
C.B.A.
Main C.B.A.
Deflection
Yoke
Connector
P1002
P4592
Flyback
Transformer
Degaussing Coil Connector
Clamper
Clamper
Frame
Anode Cap
Deflection Yoke
Degaussing Coil
Grounding Wire
PK3 PK2
PK1
Clamper
45°
+
-
Red
White
Speaker-R
Clamper
CRT Leads
Anode Lead
Picture Tube
Heat Sink
Plate
Deflection Yoke
Connector Leads
Speaker
Connector
Leads P1002
Connector
Leads C805
Power circuit
on Main C.B.A.
(Model : A, B, C, D, E, F)
After servicing, make sure that all wires, leads, and clampers
are placed in their original position. It is important for the best
operation of the unit.
Note:
No lead wires or flat cables should touch any heating parts
or the Heat Sink Plate.
Use extreme care especially for followings.
Anode Lead:
DO NOT touch the Picture Tube.
Speaker Connector Leads:
DO NOT touch Power circuit on Main C.B.A.
P1002 Connector Leads:
DO NOT touch C805.
Deflection Yoke Connector Leads and CRT Leads:
DO NOT touch Heat Sink Plate.
•
•
•
•
Fig. 8-1
WIRE AND LEAD POSITION DIAGRAM

1-17
(Model: I, J) (Model: G, H)
CRT C.B.A.
Clamper Clamper
P354
Degaussing Coil Connector
TV Main
C.B.A.
Main C.B.A.
Deflection
Yoke
Connector
P1002
P4592
Flyback
Transformer
Clamper
Clamper
Clamper
Frame
Anode Cap
Deflection Yoke
Degaussing Coil
Grounding Wire
PK3 PK2
PK1
Clamper
45°
+
-
Red
White
Speaker-R
Clamper
Anode Lead:
DO NOT touch the Picture Tube.
Speaker Connector Leads:
DO NOT touch Power circuit on Main C.B.A.
P1002 Connector Leads:
DO NOT touch C805.
Deflection Yoke Connector Leads and CRT Leads:
DO NOT touch Heat Sink Plate.
CRT Leads
Anode Lead
Picture Tube
Hea t Sink
Plate
Deflection Yoke
Connector Leads
P1002
Connector
Leads
Speaker
Connector
Leads C805
(Model : G, H, I, J)
•
•
•
•
After servicing, make sure that all wires, leads, and clampers
are placed in their original position. It is important for the best
operation of the unit.
Note:
No lead wires or flat cables should touch any heating parts
or the Heat Sink Plate.
Use extreme care especially for followings.
Power circuit
on Main C.B.A.
Fig. 8-2

1-18
Fig. 8-3
(Model : K)
Deflection Yoke
TV Main
C.B.A.
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
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
Clamper
CRT Leads
Anode Lead
Picture Tube
Heat Sink
Plate
Deflection Yoke
Connector Leads
P1002
Connector
Leads
Speaker
Connector
Leads
C805
After servicing, make sure that all wires, leads, and clampers
are placed in their original position. It is important for the best
operation of the unit.
Note:
No lead wires or flat cables should touch any heating parts
or the Heat Sink Plate.
Use extreme care especially for followings.
Anode Lead:
DO NOT touch the Picture Tube.
Speaker Connector Leads:
DO NOT touch Power circuit on Main C.B.A.
P1002 Connector Leads:
DO NOT touch C805.
Deflection Yoke Connector Leads and CRT Leads:
DO NOT touch Heat Sink Plate.
•
•
•
•
Power circuit
on Main C.B.A.