panasonic PV-M1327, PV-M1347, PV-M1357W, VV1307, VV1317W Service Manual

...

ORDER NO. MKS9701M321 B3, B6

Combination-VCR

PV-M1327

PV-M1347

PV-M1357W

VV1307

VV1317W

PV-M2037

PV-M2047

VV2007

SPECIFICATIONS

ITEM SPECIFICATION

Head: 2 rotary heads helical scanning system

4 rotary heads helical scanning system

Input Level: VIDEO IN Jack (Phono type) 1.0 Vp-p 75Ω unbalanced

Video

Signal-to-Noise Ratio: SP: more than 43 dB Horizontal Resolution: Color/Monochrome: more than 230 lines

Head: Normal Mono: 1 stationary head Input Level: AUDIO IN Jack (Phono type) -10 dBv 50kΩ unbalanced Frequency Response: Normal Mono: SP: 100 Hz ~ 8 kHz

Audio

VCR

1. PV-M1327

2. VV1307/VV1317W

3. PV-M1347/PV-M1357W

4. PV-M2037

5. VV2007/VV2017W

6. PV-M2047

Signal-to-Noise Ratio: Normal Mono: SP: more than 42 dB Wow and Flutter: Normal Mono: SP Less than 0.2% WRMS

Broadcast Channels: VHF 2 ~ 13, UHF 14 ~ 69 CATV Channels: Midband A through I (14 ~ 22)

Tuner

LP/SLP: more than 41 dB

LP: 100 Hz ~ 6 kHz SLP: 100 Hz ~ 5 kHz

LP/SLP: more than 40 dB

LP: Less than 0.3% WRMS SLP: Less than 0.4% WRMS

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

123456

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ITEM SPECIFICATION

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)

Weight and dimensions shown are approximate.

Specifications are subject to change without notice.

VCR

FM Radio

DISPLAY

GENERAL

Tape Speed

Tape Format Band Renge

Picture Tube

Power

Television System

Operating Condition

Dimension

Weight

VV2017W

123456

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is a violation of law.

! 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.

Use Marks shown in the chart below to distinguish the different models included in this Service Manual.

MODEL MARK PV-M1327 A VV1307 B VV1317W C PV-M1347 D PV-M1357W E

MODEL MARK PV-M2037 F VV2007 G VV2017W H PV-M2047 I NOT USED Z

TABLE OF CONTENTS

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

EARTH GROUND

1500Ω. 10W

0.15µF

AC VOLTMETER

Hot-Check Circuit

TO APPLIANCES EXPOSED METAL PARTS

SAFETY PRECAUTIONS

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, Exploded Views and Replacement Parts List. It is essential 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. 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 rating as this protects the technician from accidents resulting in personal injury from electrical shocks. It will also protect Combination VCR from being damaged by accidental shorting that may occur during servicing.

3. When servicing, observe the original lead dress, 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. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers, shield, and isolation R-C combinations are properly installed.

5. Before turning the receiver on, measure the resistance between B+ line and chassis ground. Connect (-) side of an 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)

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 metallic 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 sensitivity, to measure the potential across the resistor.

4. Check each exposed metallic part, and measure the voltage at each point.

5. Reverse the AC plug in the AC outlet and repeat each of the above measurements.

6. The potential at any point should not exceed 0.75 volt RMS. 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.

6. When the TV set is not used for a long period of time,

7. Potentials, as high as 25.0KV (Model: A, B, C, D, E) or

8. After servicing make the following leakage current checks

LEAKAGE CURRENT COLD CHECK

1. Unplug the AC cord and connect a jumper between the two

2. For physically operated power switches, turn power on.

3. Measure the resistance value, with an ohmmeter, between

unplug the power cord from the AC outlet.

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 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.

to prevent the customer from being exposed to shock hazards.

prongs on the plug. Otherwise skip step 2. the jumpered AC plug and each exposed metallic cabinet

part on the receiver, such as screwheads, 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.

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 that the fixture is capable of handling 25.0KV (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.

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). If the meter indication is out of tolerance, immediate service and correction is required to prevent the possibility of premature component failure.

4. To prevent an X-Radiation possibly, it is essential to use the

specified picture tube.

The meter reading should indi-

1-1

PREVENTION OF ELECTRO-

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. Short between TP891 and TP892 on the Main circuit board 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 returned 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

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 typical ES devices are integrated circuits and some field-effect transistors are semiconductor "chip" components. The following techniques should be used to help reduce the incidence of component damage caused by electrostatic discharge (ESD).

1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any ESD on your body touching a known earth ground. Alternatively, obtain and wear a commercially available discharging 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, place the assembly on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.

3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.

4. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static (ESD protected)" can generate electrical charge sufficient to damage ES devices.

5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ES devices.

6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or comparable conductive material).

7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installed.

The positive DC voltage, supplied from the D503 cathode for monitoring high voltage, is applied to the IC5301 Pin11 through R503 and R5504. Under normal conditions, the voltage at IC5301 Pin 11 is less than approx 3V. If the high voltage at Flyback Tr Pin 6 exceeds the specified voltage, the positive DC voltage which is supplied from the D503 cathode also increases. 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 Xradiation under specification.

C5507

IC5301

To Pin 6 of Flyback Transformer

D503

C513

R503

R5504

R5505

Figure 2

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 replacement ES devices. (Otherwise harmless motion such as the brushing together of your clothes fabric or the 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 for proper grounding and, in particular, specifies that the cable ground shall be connected to the grounding system of the building, as close to the point of cable entry as practical."

1-2

1-3

1-4

1-5

1-6

SERVICE NOTES

Simplified Fault Finding Data

Simplified Self-Diagnostic System facilitates finding the cause 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). This data is cleared after it is displayed and then, the POWER button is pressed back on.

1. With power turned off, press FF and REW buttons on unit together for over 3 seconds.

REW FF

Power is OFF.

2. TV power goes on and the unit goes into service mode. Fault code indication (4 digit number) will be displayed.

Code Digit Position

• Cassette Down SW. and S-Tab SW. Data

• Take Up Photo and Supply Photo Sensor Data

• Present mechanism position code

• Lock code

Explanation of Codes

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)

Fig. 1-1

Fig. 1-2

Press (Over 3 seconds)

SERVICE MODE 2192

Fault Code

TV Screen

Code No.

1 2

3 4

1 2 3 4 5 6 7 8 9 A B C D

1 2

0 1 2 3

4 4

Mode Select SW.

PLAY/CUE /SLOW/STILL

BRAKE

FF/REW

Mechanism position

position code

EJECT

LOAD

REV

EJECT

CASSETTE DOWN

1 2 3 4 5 678 9 A B C D

STOP/ STBY

ABC

REV

UNLOAD

STOP

PLAY/CUE/ SLOW/STILL

CASSETTE DOWN

FF/REWBRAKE

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.

SERVICE MODE 2192

Any operation button

Press

SERVICE MODE 0192

Changes to "0"

Fig. 1-5

Fig. 1-3

1-7

Mechanism Chassis and Cassette Up Ass'y

Stereo Amp C.B.A. (Model: I)

VCR Unit

TV Main C.B.A.

Insulated material

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 Extension Cables. However, for more extensive servicing, Extension Cables should be used.

1. Basic Service Position

Service Position Purpose

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 (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.

CAUTION:

HOT CIRCUIT

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.

(Primary circuit) exists on the Main

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. In order to stabilize VCR Unit, place it on a slanted support, such as a loose-leaf binder etc.

TV Main C.B.A.

Main C.B.A.

VCR Unit

Mechanism Chassis and Cassette Up Ass'y

It is not necessary to connect Degaussing Coil Connector

CAUTION: HOT CIRCUIT

DO NOT

curcuit during service.

Fig. 2-1

touch Power

Fig. 2-2

1-8

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

masking tape

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.

Service Position

CAUTION:

HOT CIRCUIT

Use extreme care to prevent accidental shock when servicing.

Note:

When disassembling/assembling, refer to "Disassembly/Assembly Procedures of Cabinet" section.

Fig. 3-1

(Primary circuit) exists on the Main C.B.A. and TV Main C.B.A.

1-9

Extension Cable Kit (VUZS0002)

Mode Select SW. Ass'y (VUVS0001)

8 pin

3 clip-on wires

Extension Cable -1 (VUVS0002)

14 pin

Mode Select SW. on Mode Select SW. Ass'y

EJECT Position

Alignment Projection

Head Amp C.B.A.

P3501

P2552

Shaft of Main Cam Gear

P2531

2 pin

Extension Cable -2 (VUVS0005)

12 pin

for 2 Head Model

Extension Cable -2 (VUVS0004)

15 pin

for 4 Head Model

Extension Cable -2 (VUVS0003)

20 pin

for Hi-Fi Model

Fig. 3-2

Note:

3 types of Extension Cable -2 are included in this kit. Since there is a difference in the number of P3501 Head Amp C.B.A. pins between 2 Head, 4 Head, and Hi-Fi models, be sure to use the proper cable.

Rotate

SERVICE

Full Erase Head Connector

Extension Cable -1

Extension Cable -2

3 Clip-on Wires connection

Orange

Yellow

Red

Not Used

134

(Foil Side)

Mode Select SW. Ass'y

Mode Select SW.

Main C.B.A.

IC6001

(Component Side)

See 3 Clip-on Wires connection

How to place the unit into Service Position with Extension Cables

1. Remove Rear Cover, VCR Unit, (Stereo Amp C.B.A.: Model I), Top Shield Plate Ass'y, Mechanism Chassis, and Cassette Up Ass'y.

2. Connect the Extension Cables as follows:

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.

1-10

Fig. 3-3

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. Place a jumper between TP6001 and GND to place the unit 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.

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.

slide

Slot

Screw (A)

Drive Rack Unit

Main Cam Gear

Guide Tab

pull

Spring (A)

Drive Rack Arm

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.

Yes

Main Cam Gear can be rotated

Pinch Roller is up against Capstan Rotor Unit shaft

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. While pulling the Drive Rack Unit out far enough so that it clears the Drive Rack Arm,.slide the Drive Rack Unit as indicated by the arrow to remove the cassette tape from the Cassette Up Ass'y.

9. Check the cause of mechanical trouble and repair.

Yes

Method -1:

1. While releasing 2 Locking Tabs (A) of Opener Piece, pull the Opener Piece up as far as you can.

2. Move the pin of Pinch Arm Unit out of the groove of the Main Cam Gear so that the Pinch Roller is separated from the shaft of the Capstan Rotor Unit.

Rear Side View

Opener Piece

Method 1Method 2

Main Cam Gear

Method 3

Fig. 4-1

Pinch Arm Unit

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.

Opener Piece

Pin of Pinch Arm Unit

Main Cam Gear

Locking Tabs (A)

Pull Up

Fig. 4-2

Shaft of Capstan Rotor Unit

Pinch Roller

Pinch Arm Unit

Groove

Method -3:

1. Perform Step 3 through Step 8 of Method -1.

Note:

After repairing mechanical trouble, make sure that all gear alignments are correct, especially the Wiper Arm Unit and Drive Rack Unit of Cassette Up Ass'y.

1-11

Electrical Method

Electrical method can only be performed when the mechanism 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. Remove the solder as shown and apply +10.0 VDC Power Supply (DC + to Portion "a," DC - to Portion "c").

2. When the Loading Posts reach the fully unloaded position, remove the Power Supply.

Motor P.C.B of Motor Block Ass'y

P2551

Unsolder

Method -2:

1. Locate the Jumper (J6004) on the System Control Section of the Main C.B.A. and cut it near the center.

Main C.B.A.

J6004

J6005

"c"

"b"

"a"

"b"

"a"

P2552

Rear Side View

Chassis

DC Power Supply

(+10VDC)

Fig. 5-1

Note:

Be careful not to let the DC Power Supply Unit GND contact 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. If DC + is applied to Portion "b", the Loading Motor Drive IC (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. After completing the removal procedure, solder Portion "a" and Portion "b."

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:

Be careful not to let the DC Power Supply Unit GND contact the chassis GND. This may damage the Loading Motor Drive IC (IC 2501). Be sure to apply DC + to Portion "a" of J6004. If DC + is applied to Portion "b" of J6004, the Loading Motor Drive IC (IC2501) may be damaged.

TV Main C.B.A.

Main C.B.A.

J6004

Motor P.C.B.

J6005

DC Power Supply (+10.0VDC)

1-12

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).

Wire and Lead position Diagram

After servicing, make sure that all wires and leads are placed

in their original position. It is important for the best operation of the unit.

(Model : A, B, C, D, E) (Model : F, G, H)

Anode Cap

Degaussing Coil

Deflection Yoke

Grounding Wire

Speaker-R

White

Red

P1002

VCR Main C.B.A.

PK1

PK2

Clamper

Degaussing Coil Connector

Clamper

CRT C.B.A.

P354

Degaussing Coil

45°

(Model : I)

Speaker -R Speaker -L

White

Red

Frame

Anode Cap

Deflection Yoke

Grounding Wire

P4591

TV Main C.B.A.

Clamper

Speaker-R

VCR Main C.B.A.

Frame

White

Red

P1002

P4591

TV Main C.B.A.

Degaussing Coil

PK3

Clamper

45°

Deflection Yoke Connector

Flyback Transformer

Clamper

White

Red

Clamper

PK3

45°

Clamper

Deflection Yoke Connector

Flyback Transformer

Clamper

(Model: G, H) (Model: F)

Anode Cap

Deflection Yoke

Grounding Wire

PK1

PK2

Clamper

Degaussing Coil Connector

Clamper

CRT C.B.A.

P354

P1002

VCR Main C.B.A.

P4592

Frame

TV Main C.B.A.

Note:

No lead wires or flat cables should touch any heating parts or the Heat Sink Plate of IC451, IC801, or Q551.

Clamper

P4601

PK3

Clamper

Stereo Amp C.B.A.

P4602

P4605

P4604

Deflection Yoke Connector

Flyback Transformer

Clamper

Fig. 6

1-13

Clamper

PK1

PK2

Clamper

Degaussing Coil Connector

Clamper

CRT C.B.A.

P354

TV Stereo C.B.A.

P4301

Cylinder Rotation in STOP mode

The cylinder will continue to rotate for approximately 5 minutes 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 rating as this protects the technician from accidents resulting in personal injury from electrical shocks. It will also protect Combination 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.

2. Removing the leadless component Grasp the leadless component body with tweezers and alternately apply heat to both electrodes. When the solder on both electrodes is melted, remove the leadless component with a twisting motion.

Note:

a. Do not attempt to lift the component off the board 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.

Tweezers

Chip

Soldering Iron

Fig. 7-1

3. Installing the leadless component

a. Presolder the contact points on the circuit board.

Special Note

All integrated circuits and many other semiconductor devices are electrostatically sensitive and therefore require the special handling techniques described under the "ELECTROSTATICALLY SENSITIVE (ES) DEVICES" section of this service manual.

Replacement Procedure for Leadless (Chip) Components

The following procedures are recommended for the replacement of the leadless components used in this unit.

1. Preparation for replacement a. Soldering Iron

Use a pencil-type soldering iron that uses less than 30 watts.

b. Solder

Eutectic Solder (Tin 63%, Lead 37%) is recommended.

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.

Presolder

Soldering Iron

Fig. 7-2

b. Press the part downward with tweezers and solder

both electrodes as shown below.

Tweezers

Soldering Iron

Solder

Fig. 7-3

Note:

Do not glue the replacement leadless component to the circuit board.

Note:

a. Leadless components must not be reused after

removal.

b. Excessive mechanical stress and rubbing of the

component electrode must be avoided.

1-14

Portion "a"

Top Plate

Tab

Lever

Hole Hole

Holder Unit

Tab

Slide

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 Service Manual. Use extreme care to prevent accidental shock 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 or loading mecanism 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.

Method for Manual Loading / Unloading of Mechanism

Turn the Main Cam Gear counterclockwise (for loading) or clockwise (for unloading) using needlenose pliers etc.

Needlenose Pliers

Main Cam Gear

Load

Unload/Eject

Fig. 8-1

When loading without a cassette, press Portion "a" on both sides of the Holder Unit of Cassette Up Ass'y so that the Lever clears Tab and Hole.

How to set Tracking to the Neutral Position

Ejecting the cassette tape and then, reinserting it will reset the tracking to the Neutral position.

How to reset all Combination VCR Memory functions

To reset (clear) the select language, channel auto set and set clock functions to their initial power on condition (power on, no cassette inserted), hold down the PLAY and REWIND buttons on the unit together for more than 5 seconds. Power will shut off.

Fig. 8-2

Model No. Identification Mark

Use Marks shown in the chart below to distinguish the different models included in this Service Manual.

MODEL

PV-M1327 VV1307 VV1317W PV-M1347 PV-M1357W PV-M2037 VV2007 VV2017W PV-M2047 Not Used

Note: Refer to Item 5 of Schematic Diagrams and Circuit Board Layout Notes, for mark "Z."

MARK

A B C D E F G H

1-15

IC, TRANSISTOR AND CHIP PART INFORMATION

GENERAL C.B.A./ASS'Y PARTS

UPC4570C, MN3885S, AN3361SB, AN3371SB

VCR MAIN C.B.A.

AN5367FB, AN3475FBP, MN675058A5P2

UN2112(R1=22K, R2=22K), UN2115 (R1=10K, R2=OPEN)

UN2213(R1=47K, R2=47K), UN2212(R1=22K, R2=22K), UN2215 (R1=10K, R2=OPEN)

LC8643125957, TC4053BP, 24LC01B/PS1

2SD1458, 2SD636, 2SB641, 2SD2259

AN5265, AN3809K

IMX1

TV MAIN C.B.A.

2SC2653H

2SC945A, 2SA733, 2SC1473

STR30130

2SD601, 2SD601A, 2SB709

2SD1555LBMTV, 2SD2499LBMA

DTA143ES (R1=47K, R2=OPEN), DTA144ES (R1=47K, R2=47K)

T4101, VLTS0304

LA7837

ON3131-R.KT

TV STEREO C.B.A.

AN7420

CRT C.B.A.

2SD2375, 2SC3852, 2SC4533LP.KT, 2SC5130LF608

2SC3063

VCRS0214

HOW TO READ THE IDENTIFICATION MARK OF CHIP COMPONENTS.

MARKING PART NO. MARKING PART NO.

A 2SB709 N9 MA372J X1 IMX1

MARKING

UN2213

MARKING

E1 B1E2C2

IMX1

6B UN2112 8C UN2213

hfe classification

MARKING

2SB709

HOW TO READ THE VALUES OF THE CYLINDRICAL TYPE CHIP COMPONENTS.

The widest color band must be read first for value.

3rd

2nd

1st

(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

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.

first for value.

1-16

DISASSEMBLY/ASSEMBLY PROCEDURES

DISASSEMBLY/ASSEMBLY PROCEDURES OF CABINET

Disassembly Flowchart

Perform all disassembly procedures in the order described in the "Disassembly Flowchart" shown below. When reassembling, use the reverse procedure.

CAUTION:

Disconnect AC plug before disassembly.

(Model: A, D, E)

Swivel Unit

Rear Cover

VCR Unit

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.

Bottom View

Locking Tabs (A)

1 Swivel Unit

CRT Unit

(Model: I)

Stereo Amp C.B.A.5

Top Shield

Plate Ass'y

TV Main C.B.A.7

VCR Chassis Unit

Main C.B.A.

Cassette Up Ass'y

Mechanism Chassis

Locking Tabs (A)

Fig. D2

Fig. D1

2-1

Rear Cover

VCR Unit

Disassembly Procedure

Remove 7 Screws (A). Then, pull the Rear Cover away.

(Model: A, B, C, D, E)

Rear View

Screws (A)

Fig. D3-1

2 Rear Cover

Disassembly Procedure

1. Discharge the Anode to the CRT Ground. Then, remove the 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.

Clampers

P4605 (Model : I)

Anode Cap

CRT C.B.A.

CRT Unit

P354

Stereo Amp C.B.A.

(Model : I)

(Model: F, G, H, I)

Rear View

Screws (A)

Fig. D3-2

2 Rear Cover

Clamper

Main C.B.A.

P4591 (Model : A, B, C, D, E, F, G, H)

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.

P4604 (Model : I)

Deflection Yoke Connector

Fig. D4-1

TV Main C.B.A.

Degaussing Coil Connector

3 VCR Unit

2-2

P4592

Main C.B.A.

P4301

TV Stereo C.B.A.

Clampers (A)

Top Shield Plate Ass'y

5 Stereo Amp C.B.A.

VCR Unit

Holes (A)

VCR Unit

CRT Unit

Disassembly Procedure

Remove 4 Screws with Washers (A). Then, pull out the CRT Unit.

Note:

Place the Unit face down on a soft cloth before removing the CRT Unit.

4 CRT Unit

Guide Tabs (A)

Tabs (B)

Tabs (C)

Bottom view of VCR Unit

Fig. D4-2

Reassembly Notes

1. Installation of VCR Unit

1) When installing the VCR Unit, swing the Cassette DoorLid 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 in.

Cassette Door-Lid

CAUTION

Press

View "A"

Screws with Washers (A)

Fig. D5

Screws with Washers (A)

Stereo Amp C.B.A. (Model: I)

Disassembly Procedure

1. Disconnect 2 Connectors P4592 on the Main C.B.A. and P4301 on the TV Stereo C.B.A.

2. Release 3 Clampers (A) on the TV Stereo C.B.A. Then, remove the Stereo Amp C.B.A.

View "A"

Cassette Door Tab

Opener Lever

VCR Unit

Cassette Door-Lid

Fig. D6

Fig. D4-3

2-3

Top Shield Plate Ass'y

TV Main C.B.A.

Disassembly Procedure

1. Release the 2 Clampers (B) on the Top Shield Plate Ass'y and remove the leads from the clampers.

2. Remove 3 Screws (B). Then, remove the Top Shield Plate Ass'y.

Clampers (B)

6 Top Shield Plate Ass'y

Screws (B)

Clamper

Fig. D7-1

Disassembly Procedure

1. Disconnect Connector P1002 on the Main C.B.A.

2. Disconnect 3 Connectors PK1, PK2, and PK3 on the TV Main C.B.A.

Note :

When disconnecting or connecting 3 Connectors PK1, PK2, and PK3, take extreme care not to break them.

3. Remove the TV Main C.B.A. by releasing 2 Locking Tabs (B) and A/C Cord from the frame.

PK1

7 TV Main C.B.A.

PK3

Main C.B.A.

PK2

A/C Cord

Reassembly Notes

1. When installing the Top Shield Plate Ass'y, make sure the 2 Clampers (B) on the Cassette Up Ass'y are turned in the direction shown. If not, the Top Shield Plate Ass'y cannot be installed.

Clampers (B)

Cassette Up Ass'y

P1002

Locking Tabs (B)

Fig. D8

Fig. D7-2

2-4

P3501

P2531

P2552

Mode Select SW.

Sensor LED

9 Main C.B.A.

P4001

Mechanism Chassis Unit

Full Erase Head

Hole

VCR Chassis Unit

Main C.B.A.

Disassembly Procedure

1. Slide the Holder Unit (refer to "Method for Manual Loading/ Unloading of Mechanism" in Service Notes) to remove 2 Screws (C).

2. (Model: A, B, C, D, E) Remove 3 Screws (D) and Screw (E). (Model: F, G, H, I) Remove 2 Screws (D) and Screw (E).

3. Remove 2 Screws with Washers (B).

Screw (D) (Model: A, B, C, D, E)

Screw with Washer (B)

Screw (E)

Screw (D)

"A"

Screws (C)

Screw with Washer (B)

8 VCR Chassis Unit

Holder Unit

Disassembly Procedure

1. Disconnect 4 Connectors of P2531, P2552, P3501 and P4001.

2. Carefully lift the Mechanism Chassis Unit straight out from the Main C.B.A.

Note:

Work carefully so as not to break Sensor LED, when lifting the Mechanism Chassis Unit.

Locking

Frame

Fig. D9

4. While pushing Locking Tab (C) outward, lift the right side of the Cassette Up Ass'y (Portion "A"). Then, lift the VCR Chassis Unit out of the Frame.

Note:

Work carefully so as not to break tab.

Tab (C)

Fig. D10-1

Reassembly Notes

1. Make sure that the Mode Select SW. on the Main C.B.A. is in EJECT position before installing the Mechanism Chassis Unit onto the Main C.B.A. If not, rotate the Mode Select SW. until the alignment projection is in the EJECT Position.

Mode Select SW.

2. Be sure to install the Mechanism Chassis Unit straight onto the Main C.B.A. so that the Sensor LED clears the hole in the Mechanism Chassis Unit.

3. Be sure that 4 Connectors (P2531, P2552, P3501, and P4001) are aligned and seated securely.

EJECT Position

Rotate

Alignment Projection

SERVICE

Fig. D10-2

2-5

Cassette Up Ass'y

Disassembly Procedure

1. Slide the Holder Unit (refer to "Method for Manual Loading/ Unloading of Mechanism" in Service Notes) to remove 2 Screws (F).

2. Remove Screw (G).

3. Unhook Spring (A).

4. Slide the Cassette Up Ass'y towards the front to release Tab (C). Then, lift it up and remove.

Screw (F)

10 Cassette Up Ass'y

Tab (C)

Guide Holes

Spring (A)

Screw (G)

Holder Unit

Guide Holes

11 Mechanism Chassis

Screw (F)

Fig. D11

Reassembly Notes

1. Installation of Cassette Up Ass'y

1) Confirm that the 3 pins and Tab (C) under the Cassette

Up Ass'y are in each of the 4 Guide Holes on the Mechanism Chassis when installing the Cassette Up Ass'y. Then, slide the Cassette Up Ass'y towards the back.

2) Tighten 2 Screws (F) and Screw (G).

Be careful not to tighten them too much, or the Cassette Up Ass'y may be bent outward.

2-6

DISASSEMBLY/ASSEMBLY PROCEDURES OF MECHANISM

Disassembly Method

This chart indicates Step/Location No. of Parts to be serviced and prior steps to gain access items to be serviced when disassembling. When reassembling, perform the step(s) in the reverse order.

Step /Loc. No.

1 2 3 4 5 6 7 8 9

Step/Loc. No.: Order of steps in procedure. Part : Part to be removed or installed. Prior Step(s) : Steps to be completed prior to the current step.

Part Prior Step(s)

Cylinder Unit Upper Cylinder Unit Opener Piece Pinch Arm Unit Motor Block Ass'y Audio Control Head Unit Main Cam Gear Drive Rack Arm Main Lever P5 Arm Unit

------------

5 3, 4, 5 3, 4, 5, 7

------------

Step /Loc. No.

11 12 13 14 15 16 17 18 19 20

Part Prior Step(s)

Main Lever Drive Arm T Brake Unit Changing Lever A T Reel Table Full Erase Head Tension Arm Unit S Spring Arm S Reel Table S Brake Arm Unit Main Lever Guide

3, 4, 5, 7, 8, 9 9 9 9, 12, 13

------------

16, 17 9, 16, 17, 18 9

Step /Loc. No.

21 22 23 24 25 26 27 28 29 30

Part Prior Step(s)

Loading Post Base-S Unit Loading Post Base-T Unit Capstan Rotor Unit Capstan Holder Unit SS Brake Arm Unit Junction C.B.A. Capstan Stator Unit Sub Rotor PCB Holder T Loading Arm Unit

16 9, 20

------------

23, 25, 26 23, 25, 26, 27 23, 25, 26, 27

------------

Note: When the mechanical parts surrounded by rectangle are removed or replaced, be sure to perform necessary adjustment or alignment procedures according to the mechanical adjustment procedures section and disassembly/assembly procedures of mechanism section.

Perform all disassembly and alignments procedures in EJECT Position.

Step /Loc. No.

S Loading Arm Unit

31 32

Center Clutch Unit

Changing Gear Spring

Changing Gear

Changing Lever-B

Idler Arm Unit Loading Rack

Grounding Plate Unit

38 39

FG Head

Part Prior Step(s)

------------

32 32, 33 32, 33, 34 32, 33, 34 9, 30

------------

TOP VIEW

Cylinder Unit

Audio Control Head Unit

Upper Cylinder Unit

Full Erase Head

Loading Rack

Loading Post Base-S Unit

Tension Arm Unit

S Reel Table

S Spring Arm

S Brake Arm Unit

Loading Post Base-T Unit

BOTTOM VIEW

SS Brake Arm Unit

PCB Holder

Motor Block Ass'y

Pinch Arm Unit

Main Cam Gear

Drive Rack Arm

Opener Piece

Main Lever Drive Arm

P5 Arm Unit

Main Lever

Capstan Holder Unit

T Brake Unit

T Reel Table

Changing Lever A

Grounding Plate Unit

Junction C.B.A.

FG Head

Sub Rotor

Capstan Rotor Unit

Capstan Stator Unit

Capstan Belt

Changing Gear Spring

Changing Lever-B

Fig. J1

2-7

T Loading Arm Unit

S Loading Arm Unit

Main Lever Guide

Idler Arm Unit

Changing Gear

Center Clutch Unit

Cylinder Unit

Reassembly Notes

Disassembly Procedure

1. Remove 3 Screws (A) and 2 Screws with Washers (A). Then, lift the Cylinder Unit and the Head Amp C.B.A. out from the mechanism.

2. Unsolder P3502 and P3503. Then, remove the Head Amp C.B.A.

Note:

Use extreme care when removing or replacing the Cylinder Unit. Do not touch the Video Heads during servicing.

CAUTION:

When removing the Cylinder Unit, avoid touching IC2601 on the Head Amp C.B.A. because it is HOT during operation.

Head Amp C.B.A.

IC2601

CAUTION:

Screw with Washer (A)

View A

Screw with Washer (A)

HOT during operation

1 Cylinder Unit

Guide Pin

1. Use extreme care when removing or replacing the Cylinder Unit. Do not touch the Video Heads during servicing.

2. Installation of Cylinder Unit

1) Install the Cylinder Unit so that the 2 holes on the lower

surface of the Cylinder Unit fit over the 2 Guide Pins on the Cylinder Base and loosely secure it with 3 Screws (A).

2) Install the Head Amp C.B.A. so that the hole on the

Head Amp C.B.A. lines up with the hole on the chassis and secure it with 2 Screws with Washers (A).

3) Position the Cylinder Unit so that foil patterns of

connectors (P3502 and P3503) and Head Amp C.B.A. are aligned, and tighten 3 Screws (A).

4) Solder connectors (P3502 and P3503).

3. Adjustment of Grounding Plate Unit

1) After installing, make sure that the Grounding Plate

Unit, on the bottom side of mechanism chassis, is positioned on the right side of the Cylinder shaft so that the center line of the plate is just less than 1.0 mm measured from the center of the Cylinder shaft. If required, adjust the plate position by loosening Black Screw (A). Never install the Grounding Plate Unit on the left side of the Cylinder shaft. Incorrect positioning will cause cylinder buzz.

Black Screw (A)

38 Grounding Plate

Unit

Cylinder Shaft

Through Hole

Screws with Washers (A)

View A

Unsolder

P3502

P3503

Fig. J2-1

Screws (A)

Head Amp C.B.A.

Chassis

Rotating

Center

1mm

Fig. J2-2

2) After installing, perform the "Tape Interchangeability

Adjustment/Confirmation Procedures."

Direction

2-8

Upper Cylinder Unit

Locking Tab (B)

Locking Tabs (A)

4 Pinch Arm Unit

3 Opener Piece

5 Motor Block Ass'y

Screw with Washer (C)

6 Audio Control Head Unit

Disassembly Procedure

1. Remove 2 Screws with Washers (B).

2. Carefully lift the Upper Cylinder Unit from the shaft.

2 Upper Cylinder Unit

Screws with Washer (B)

Lower Cylinder

Hole

Indentation

Opener Piece, Pinch Arm Unit, Motor Block Ass'y, and Audio Control Head Unit

Disassembly Procedure

1. Remove the Opener Piece by pulling it upward while releasing 2 Locking Tabs (A).

2. Pull up on the Pinch Arm Unit.

3. Release 3 Locking Tabs (B) and remove Screw with Washer (C). Then, remove the Motor Block Ass'y and Audio Control Head Unit.

Note:

Use extreme care when removing or replacing the Upper Cylinder Unit. Do not touch the Video Heads during servicing.

Reassembly Notes

1. Use extreme care when removing or replacing the Cylinder Unit. Do not touch the Video Heads during servicing.

2. Alignment of Upper Cylinder Unit

1) When installing, make sure that the hole on the Upper

2) After installing, perform the "Tape Interchangeability

Fig. J3

Cylinder is aligned with the indentation on the Lower Cylinder.

Adjustment/Confirmation Procedures."

Fig. J4

Reassembly Notes

1. Installation of Audio Control Head Unit

1) Install the Audio Control Head Unit before Motor Block Ass'y.

2) After installing, perform the "Tape Interchangeability Adjustment/Confirmation Procedures."

2-9

Main Cam Gear and Drive Rack Arm

Reassembly Notes

Disassembly Procedure

1. Remove the Main Cam Push Nut. (Refer to Note.)

2. Pull up on the Main Cam Gear.

3. Turn the Drive Rack Arm fully counterclockwise as shown.

4. Pull up on the Drive Rack Arm.

8 Drive Rack

7 Main Cam Gear

Main Cam Push Nut

Fig. J5-1

Note:

When removing the Main Cam Push Nut, use a screwdriver etc.

Shaft of Main Cam Gear

Arm

turn

1. Alignment of Main Cam Gear and Drive Rack Arm

1) Install the Drive Rack Arm so that the hole (A) is aligned with the hole on chassis as shown (Through hole (A)).

2) Install the Main Cam Gear so that the 2 holes (B) marked "E" are aligned with the hole on chassis as shown (Through hole (B)). ("E" indicates the EJECT position.)

Chassis Hole

Main Cam Gear

2. Installation of Main Cam Gear and Main Cam Push Nut

1) Position the chassis upside down placing a Support under the Main Cam Gear. Install the Main Cam Push Nut with Needlenose Pliers etc. so that it is flush with the chassis.

There may be some slight scratches on the Shaft of Main Cam Gear, when removing the Main Cam Gear. In case that the Main Cam Gear can be installed securely without tottering, it is fine to use the one. If any tottering, replace a new one.

Fig. J5-3

mark

Chassis

Through Holes (B)

Drive Rack Arm

Through Hole (A)

Bottom of Chassis

Main Cam Gear

Fig. J5-2

Main Cam Push Nut

Screwdriver

Press

Needlenose Pliers

Shaft of Main Cam Gear

Main Cam Push Nut

Bottom of Chassis

Main Cam Gear

support

Fig. J5-4

3. Main Cam Push Nut is not reusable. If removed, install a new one.

2-10

Main Lever

11 Main Lever Drive Arm

10 P5 Arm Unit

turn

Main Lever Drive Arm

Chassis

Through Hole (C)

P5 Arm Unit and Main Lever Drive Arm

Disassembly Procedure

1. Release 2 Locking Tabs (C) and Locking Tab (D). Then, remove the Main Lever.

Locking Tab (D)

Locking Tabs (C)

9 Main Lever

Disassembly Procedure

1. Pull up on the P5 Arm Unit.

2. Turn the Main Lever Drive Arm fully counterclockwise as shown.

3. Pull up on the Main Lever Drive Arm.

Fig. J7-1

Reassembly Notes

1. Confirmation of Main Lever

Fig. J6-1

1) Confirm that bosses and shafts are set properly after installation of Main Lever.

Loading Rack Shaft

Main Lever

S Brake Arm Unit Shaft

Changing Lever A Boss

P5 Arm Unit Boss

T Brake Unit Boss

Fig. J6-2

Reassembly Notes

1. Alignment of Main Lever Drive Arm

1) Install the Main Lever Drive Arm so that the hole (C) is aligned with the hole on the Chassis as shown (Through hole (C)).

Fig. J7-2

2-11

T Brake Unit, Changing Lever A, and T Reel Table

Full Erase Head, Tension Arm Unit, S Spring Arm, and S Reel Table

Disassembly Procedure

1. Remove the T Brake Unit while releasing Locking Tab (E) located under the chassis.

2. Remove Cut Washer (A). Then, pull up on the Changing Lever A and remove.

3. Pull up on the T Reel Table.

Cut Washer (A)

Locking Tab (E)

13 Changing Lever A

12 T Brake Unit

14 T Reel Table

Reel Washer

Disassembly Procedure

1. Turn the Full Erase Head fully counterclockwise as shown. Then remove it.

2. Unhook Spring (A).

3. Remove the Tension Arm Unit by pulling it up while releasing 2 Locking Tabs (F).

4. Remove the S Spring Arm while releasing Locking Tab (G).

5. Pull up on the S Reel Table.

Spring (A)

16 Tension Arm Unit

15 Full Erase Head

Locking Tab (G)

turn

17 S Spring Arm

18 S Reel Table

Fig. J8-1

Reassembly Notes

1. How to distinguish between S Reel Table and T Reel

Table

T Reel TableS Reel Table

Top View

difference

Fig. J8-2

2. Adjustment of T Reel Table

1) After installing, perform the "Reel Table Height Adjustment Procedures."

3. Be careful not to lose the Reel Washer under the T Reel Table.

4. Cut Washer (A) is not reusable. If removed, install a new one.

Locking Tabs (F)

"A"

View "A"

Fig. J9

Reel Washer

Locking Tabs (F)

Reassembly Notes

1. Adjustment of S Reel Table

1) After installing, perform the "Reel Table Height Adjustment Procedures".

2. Be careful not to lose the Reel Washer under the S Reel Table.

3. Adjustment of Tension Arm Unit

1) After installing, perform the "Tension Post Adjustment

Procedures."

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