Panasonic Omnivision VHS PV-V402 Bedienungsanleitung

ORDER NO. MKE0111000C1

Video Cassette Recorder

PV-V402 / PV-V4022 / PV-V4522 / PV-V4612

SPECIFICATIONS

MC-Service

2001 Matsushita Kotobuki Electronics Industries Ltd. All rights

reserved. Unauthorized copying and distribution is a violation of law.

1. 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 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 personal injury 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 the chassis, the reading

should be between 1 M and 5.2 M . When the exposed metal does

not have a return path to the chassis, the reading must be infinity.

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 1.5 k , 10 W resistor, in parallel with a 0.15 F 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 1 k /V 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 V 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 mA. In case a

measurement is outside of 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.

Figure 1

2. PREVENTION OF ELECTRO-STATIC DISCHARGE

(ESD) TO ELECTROSTATICALLY SENSITIVE (ES)

DEVICES

Some semiconductor (solid state) devices can be damaged easily by static electricity. Such

components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES

devices are integrated circuits, some field-effect transistors and 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 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.

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 820-22 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."

3. OPERATION GUIDE

MC-Service

4. SERVICE NOTES (PLEASE READ)

4.1. SERVICE NOTES

4.1.1. SIMPLIFIED FAULT FINDING DATA

implified Self-Diagnostic System facilitates finding the cause of the fault. A 3-digit fault code will be

displayed in F.I.P.

The Simplified Fault finding data is stored in the Memory IC (IC6005). This data is cleared after it is

displayed, and then the POWER button is pressed back on.

1. With power turned off, press CH DOWN button on VCR (for over 3

seconds if VCR is not in shut off condition).

Fig. 1-1

2. Fault code (3-digit number) will be displayed in F.I.P. as shown.

Fig. 1-2

Fig. 1-3

Fig. 1-4

Fig. 1-5

3. When 1 to 4 listed in Lock code occurs, Lock data will be stored in the

Memory IC (latest Lock data only).

Note:

1. Lock data will be kept after the AC Cord is unplugged.

2. When 1 to 4 listed in Lock code occurs for the first time, the VCR does

not go into VCR shut-off condition. If it occurs again within a minute,

the VCR goes into VCR shut-off condition. Then, the VCR stops and all

VCR function buttons except for power become non-operational.

3. Lock data will be cleared at the first power on operation after lock

code is displayed in FIP.

4.1.2. USAGE SCREEN MODE

Function displayed on the TV monitor:

- the total elapsed ”Cylinder rotation ”time (in hours)

1. With power turned on and no cassette, press CH DOWN button on

VCR and 7 key on remote together.

(The USAGE SCREEN will be displayed on the TV Monitor.)

Fig. 2

Note:

1. After replacing the Cylinder Unit, press COUNTER RESET button on

remote in this mode. Total elapsed "Cylinder rotation" time (in hours)

will be cleared to 0.

2. To release from Usage Screen Mode, press any operation button on

VCR or insert a cassette tape in this mode. The VCR will return to

normal operation mode.

4.1.3. EEPROM IC (IC6005), MAIN C.B.A. REPLACEMENT NOTE

After replacing EEPROM IC (IC6005) or Main C.B.A., be sure to perform the "PG SHIFTER

ADJUSTMENT" in ELECTRICAL ADJUSTMENT procedures.

4.1.4. SERVICE POSITION

4.1.4.1. Service Position

CAUTION:

HOT CIRCUIT (Primary circuit) exists on the Main C.B.A.

Use extreme care to prevent accidental shock when servicing.

4.1.4.1.1. Service Position (1)

Fig. 3-1

MC-Service

4.1.4.1.2. Service Position (2-1)

(Normal Frame Model)

Fig. 3-2-1

4.1.4.1.3. Service Position (2-2)

(Wide Frame Model)

Fig. 3-2-2

Note:

1. It is possible that the S-Tab SW. may not work correctly in Service

Position (2-1), (2-2). (Recording can not be done). In this case, short

the S-Tab SW. Pins on the foil side of the Main C.B.A. to turn this SW.

on.

Fig. 3-3

2. Place the tape between the Cassette Up Ass’y and Main C.B.A. to get a

stability.

3. When disassembling/assembling, refer to "CABINET SECTION" in

DISASSEMBLY/ASSEMBLY PROCEDURES.

Fig. 3-4

4.1.5. HOT CIRCUIT

Primary circuit exists on the 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.

4.1.6. SERVICE MODE

In order to inhibit detection of the Supply & Takeup Photo Transistors, Reel Sensor, and Cylinder

Lock, press and hold FF button and CH DOWN buttons on VCR together over 5 seconds in power off

condition.

Fig. 4-1

The power comes on and the unit goes into service mode.

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, press POWER button off or disconnect AC Plug.

4.1.7. TRACKING CENTER MODE (TRACKING FIX AT CENTER)

Insert the Cassette tape. Set the unit into Service Mode. Play back the Cassette tape. Press PLAY

button in Play back mode. "TRACKING CENTER" will be displayed on the TV monitor.

In this mode, the tracking is fixed at center. (Auto tracking and manual tracking functions are not

operational.)

Fig. 4-2

MC-Service

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