Panasonic Omnivision PV-9661 User manual

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Service Manual
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ORDER NO. MKE9901002C1
B3
Video Cassette Recorder
● PV-9661/PV-9662
© 1999 Matsushita-Kotobuki Electronics Industries LTD. All rights reserved. Unauthorized copying and distribution is a
violation of law.
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1 SAFETY PRECAUTIONS
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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
ReplacementParts List. It is essential that these critical parts should be replaced with
manufacturer´s specified parts to prevent 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 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 personalinjury from electrical shocks. It will
also protect VCR from being damaged by accidental shorting that may occur during servicing.
3. When servicing, observe the original lead dress. 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 shields are properly installed.
5. After servicing, make the following leakage current checks to prevent the customer from being
exposed to shock hazards.
LEAKAGE CURRENT COLD CHECK
1. Unplug the AC cord and connect a jumper between the two prongs on the plug.
2. Measure the resistance value, with an ohmmeter, between the jumpered AC plug and each
exposed metallic cabinet part on the equipment such as screwheads, connectors, control shafts,
etc. When the exposed metallic part has a return path to thechassis, the reading should be
between 1M ohm and 5.2M ohm. When the exposed metal does not have a return path to the
chassis, the reading must be infinity.
Figure 1
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LEAKAGE CURRENT HOT CHECK
(See figure 1.)
1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this
check.
2. Connect a 1.5K ohm, 10 watts resistor, in parallel with a 0.15 microfarad 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 volts RMS. A leakage current tester
(Simpson Model 229 or equivalent) may be used to make the hot checks. Leakage current must
not exceed 1/2 milliamp. In case a measurement is outsideof the limits specified, there is a
possibility of a shock hazard, and the equipment should be repaired and rechecked before it is
returned to the customer.
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2 PREVENTION OF ELECTROSTATIC
DISCHARGE (ESD) TO
ELECTROSTATICALLY SENSITIVE (ES)
DEVICES
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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, some field-effect transistorsand 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 by touching a known earth ground. Alternatively,
obtain and wear a commercially available discharging ESD wrist strap,which should remove
electrostatic charge 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 antistatic solder removal device. Some solder removal devices not classified as
"antistatic (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 comparableconductive 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.
CAUTION:Be sure no power is applied to the chassis or circuit, and observe all other safety
precautions.
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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 820-22 of the NEC
that provides guidelines for proper grounding and, in particular, specifies that the cable ground shall
be connected to the grounding systemof the building, as close to the point of cable entry as practical."
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3 OPERATION GUIDE
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4 SERVICE NOTES (PLEASE READ)
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4.1 SERVICE NOTES
4.1.1 SIMPLIFIED FAULT FINDING DATA
4.1.2 SERVICE POSITION
4.1.2.1 Basic Service Position
4.1.2.1.1 Service Position (1)
4.1.2.1.2 Service Position (2)
4.1.2.2 Service Position with Extension Cable Kit
4.1.2.2.1 Service Position
4.1.2.2.2 Extension Cable Kit (VUZS0002)
4.1.2.2.3 How to place the unit in the Service Position (1)
4.1.3 HOT CIRCUIT
4.1.4 SERVICE MODE
4.1.5 INSTALLATION OF FRONT PANEL ASS´Y CAUTION
4.1.6 METHOD FOR LOADING/UNLOADING OF MECHANISM
4.1.7 HOW TO REMOVE A JAMMED TAPE
4.1.7.1 Manual Method
4.1.7.1.1 Method -1:
4.1.7.1.2 Method -2:
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4.1.7.1.3 Method -3:
4.1.7.2 Electrical Method
4.1.8 DEFEATING THE AUTO TRACKING
4.1.9 HOW TO SET TRACKING TO THE NEUTRAL POSITION
4.1.10 CYLINDER ROTATION IN STOP MODE
4.1.11 BLACK SCREWS ON THE CHASSIS
4.1.12 HOW TO RESET ALL VCR MEMORY FUNCTIONS
4.1.13 VARIABLE VOLTAGE ISOLATION TRANSFORMER
4.1.14 SPECIAL NOTE
4.1.15 REPLACEMENT PROCEDURE FOR LEADLESS (CHIP) COMPONENTS
4.1.16 MODEL NO. IDENTIFICATION MARK
4.2 IC, TRANSISTOR AND CHIP PART INFORMATION
4.2.1 HOW TO READ THE IDENTIFICATION MARK OF CHIP COMPONENTS.
4.2.2 HOW TO READ THE VALUES OF THE CYLINDRICAL TYPE CHIP COMPONENTS.
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4.1 SERVICE NOTES
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4.1.1 SIMPLIFIED FAULT FINDING DATA
4.1.2 SERVICE POSITION
4.1.2.1 Basic Service Position
4.1.2.1.1 Service Position (1)
4.1.2.1.2 Service Position (2)
4.1.2.2 Service Position with Extension Cable Kit
4.1.2.2.1 Service Position
4.1.2.2.2 Extension Cable Kit (VUZS0002)
4.1.2.2.3 How to place the unit in the Service Position (1)
4.1.3 HOT CIRCUIT
4.1.4 SERVICE MODE
4.1.5 INSTALLATION OF FRONT PANEL ASS´Y CAUTION
4.1.6 METHOD FOR LOADING/UNLOADING OF MECHANISM
4.1.7 HOW TO REMOVE A JAMMED TAPE
4.1.7.1 Manual Method
4.1.7.1.1 Method -1:
4.1.7.1.2 Method -2:
4.1.7.1.3 Method -3:
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