Panasonic AG513F - COMBINATION VCR/TV Bedienungsanleitung

ORDERNO. MKE0304102C1

Combination VCR

AG-513F / AG-520F

SPECIFICATIONS

2003 Matsushita Kotobuki Electronics Industries LTD. All rights

reserved. Unauthorized copying and distribution isaviolation of

law.

1. SAFETY PRECAUTIONS

GENERALGUIDELINES

1. IMPORTANTSAFETY NOTICE

There are special components used inthisequipment which are

important for safety. These parts are marked byinthe

SchematicDiagrams, CircuitBoard Layout, Exploded Viewsand

Replacement Parts List. Itisessential that these critical parts

shouldbe replaced with manufacturer's specified parts to prevent

X-RADIATION, shock, fire, or other hazards. Donot modifythe

original design without permission of manufacturer.

2. AnIsolation Transformer shouldalwaysbe used during the

servicing of Combination VCR whose chassisisnot isolated from

the AC power line. Use atransformer of adequate power rating as

thisprotects the technician from accidents resulting inpersonal

injuryfrom electrical shocks. Itwill also protect Combination VCR

from being damaged byaccidental shorting that mayoccur during

servicing.

3. When servicing, observe the original lead dress, especiallythe

lead dress inthe high voltage circuits. Ifashort circuitisfound,

replace all parts which have been overheated or damaged bythe

short circuit.

4. After servicing, see to itthat all the protective devices such as

insulation barriers, insulation papers, shield, and isolation R-C

combinations are properlyinstalled.

5. Before turning the receiver on, measure the resistance between B+

line and chassisground. Connect (-) side of an ohmmeter to the B

+ lines, and (+)side to chassisground. Each line shouldhave

more resistance than specified, as follows:

(For model with 13 inch CRT)

B+ Line

Minimum Resistance

130.0V

1k (Coldchassisground)

23.5V

180 (Coldchassisground)

13.0V

110 (Coldchassisground)

(For model with 20 inch CRT)

B+ Line

Minimum Resistance

130.0V

1k (Coldchassisground)

21.5V

180 (Coldchassisground)

15.9V

110 (Coldchassisground)

6. When the TV set isnot used for along period of time, unplug the

power cord from the AC outlet.

7. Potentials, as high as 25.0kV (For model with 13 inch CRT) or

30.0kV (For model with 20 inch CRT) are present when thisTV set

isinoperation. Operation of the TV set without the rear cover

involves the danger of ashock hazard from the TV set power

supply. Servicing shouldnot be attempted byanyone who isnot

thoroughlyfamiliar with the precautions necessarywhen working

on high voltage equipment. Alwaysdischarge the anode of the

picture tube to the CRTground 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 CURRENTCOLD CHECK

1. Unplug the AC cord and connect ajumper between the two

prongs on the plug.

2. For physicallyoperated power switches, turn power on. Otherwise

skipstep 2.

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

jumpered AC plug and each exposed metalliccabinet part on the

receiver, such as screwheads, connectors, etc. When the exposed

metallicpart has areturn path to the chassis, the reading should

be between 1M and 12 M . When the exposed metal does not

have areturn path to the chassis, the reading must be infinity.

LEAKAGE CURRENTHOTCHECK

1. Plug the AC cord directlyinto the AC outlet.

Donot use aisolation transformer for thischeck.

2. Connect a1.5k , 10 Wresistor, inparallel with a0.15 F

capacitor, between each exposed metallicpart on the set and a

good earth ground , as showninFigure 1.

3. Use an AC voltmeter, with 1k /Vor more sensitivity, to measure

the potential across the resistor.

4. Check each exposed metallicpart, and measure the voltage at

each point.

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

measurements.

6. The potential at anypoint shouldnot exceed 0.75 VRMS.

Aleakage current tester (Simpson Model 229 equivalent) maybe

used to make the hot checks. Leakage current must not exceed 1/

2mA. Incase ameasurement isoutside of the limits specified,

there isapossibilityof shock hazard, and the receiver shouldbe

repaired and rechecked before itisreturned to the customer.

Figure 1

2. X-RADIATION

WARNING :

1. The potential source of X-Radiation inTV sets isthe High Voltage

section and the picture tube.

2. When using apicture tube test fixture for service, ensure that the

fixture iscapableof handling 25.0kV (For model with 13 inch

CRT) or 30.0kV (For model with 20 inch CRT) without causing X-

Radiation.

NOTE :

Itisimportant to use an accurate periodicallycalibrated high

voltage meter.

1. Reduce the brightness to minimum.

2. Set the SERVICEswitch to SERVICE.

3. Measure the High Voltage. The meter reading shouldindicate 23.5

kV±1.5kV (For model with 13 inch CRT) or 28.5kV±1.5kV (For

model with 20 inch CRT).

Ifthe meter indication isout of tolerance, immediate service and

correction isrequired to prevent the possibilityof premature

component failure.

4. To prevent an X-Radiation possibly, itisessential to use the

specified picture tube.

HORIZONTALOSCILLATOR DISABLE CIRCUITTEST

SERVICE WARNING :

The test must be made as a final check before set is returnedtothe customer.

1. With the rear cover removed, supplyabout a90 VAC power

source to the set, turn on the set.

2. Set the customer controlsto normal operating positions.

3. Short both sides of R804 on the Maincircuitboard with ajumper

wire. Confirm that the picture goes out of horizontal sync.

4. Ifthisdoes not occur, the horizontal oscillator disablecircuitis

not operating. Follow the RepairProcedures of horizontal

oscillator disablecircuitbefore the set isreturned to customer.

REPAIR PROCEDURES OFHORIZONTALOSCILLATOR DISABLE CIRCUIT

1. Connect aDC voltmeter between capacitor C513 (+)on the Main

circuitboard and chassisground.

2. Ifapproximately+21.0V(For model with 13 inch CRT) or +21.9V

(For model with 20 inch CRT) isnot present at that point when 120

VAC isapplied, find the cause. Check R518 (For model with 20

inch CRT), R503, R5504, R5505, D503, C513, C5507 and J5501.

3. Carefullycheck above specified parts and related circuits and

parts. When the circuitisrepaired, trythe horizontal oscillator

disablecircuittest again.

CIRCUITEXPLANATION

HORIZONTALOSCILLATOR DISABLE CIRCUIT

The positive DC voltage, suppliedfromthe D503 cathode formonitoring high voltage, is applied

tothe IC5301 Pin11 through R503 and R5504. Undernormal conditions, the voltage at IC5301

Pin11 is less thanapprox 3 V. If the high voltage at Flyback TrPin5 exceeds the specified

voltage, the positive DC voltage whichis suppliedfromthe D503 cathode alsoincreases. The

increasedvoltage is appliedtoIC5301 Pin11 through R503 and R5504. Due tothe increased

voltage at IC5301 Pin11, the horizontal oscillatorfrequencyincreases, the picture goes out of

horizontal sync, the beamcurrent decreases and the picture becomes dark inordertokeepX-

radiation underspecification.

Figure 2

3. PREVENTION OF ELECTROSTATIC DISCHARGE

(ESD) TO ELECTROSTATICALLY SENSITIVE (ES)

DEVICES

Some semiconductor(solidstate) devices canbe damagedeasilybystatic electricity. Such

components commonlyare calledElectrostaticallySensitive (ES) Devices. Examples of typical

ES devices are integratedcircuits and some field-effect transistors are semiconductor"chip"

components. The following techniques shouldbe usedtohelpreduce the incidence of

component damage causedbyelectrostatic discharge (ESD).

1. Immediatelybefore handling anysemiconductor component or

semiconductor-equipped assembly, drainoff anyESDon your

bodytouching aknownearth ground. Alternatively, obtainand

wear acommerciallyavailabledischarging ESDwrist strap, which

shouldbe removed for potential shock reasons prior to applying

power to the unitunder test.

2. After removing an electrical assemblyequipped with ES devices,

place the assemblyon aconductive surface such as aluminum

foil, to prevent electrostaticcharge buildup or exposure of the

assembly.

3. Use onlyagrounded-tipsoldering iron to solder or unsolder ES

devices.

4. Use onlyan antistaticsolder removal device. Some solder

removal devices not classified as "antistatic(ESDprotected)" can

generate electrical charge sufficient to damage ES devices.

5. Donot use freon-propelled chemicals. These can generate

electrical charges sufficient to damage ES devices.

6. Donot remove areplacement ES device from its protective

package until immediatelybefore you are readyto install it. (Most

replacement ES devices are packaged with leads electrically

shorted together byconductive foam, aluminum foil or

comparableconductive material).

7. Immediatelybefore removing the protective material from the

leads of areplacement ES device, touch the protective material to

the chassisor circuitassemblyinto which the device will be

installed.

CAUTION:

Besure no power isapplied to the chassisor circuit, and observe

all other safetyprecautions.

8. Minimize bodilymotions when handling unpackaged replacement

ES devices. (Otherwise harmless motion such as the brushing

together of your clothes fabricor the lifting of your foot from a

carpeted floor can generate staticelectricity(ESD)sufficient to

damage an ES device).

"NOTE toCATV systeminstaller:

This reminderis providedtocall the CATV systeminstaller's attention toArticle 820-40 of the

NEC that provides guidelines forpropergrounding and, inparticular, specifies that the cable

ground shall be connectedtothe grounding systemof the building, as close tothe point of

cable entryas practical."

4. ABOUT LEAD FREE SOLDER (PbF)

5. SERVICE NOTES (PLEASE READ)

5.1. SERVICENOTES

5.1.1. SIMPLIFIED FAULT FINDING DATA

SimplifiedSelf-Diagnostic Systemfacilitates finding the cause of the fault. A 4 digit forfault

code and communication forI2C bus code will be displayedon TV screen.

The SimplifiedFault finding data is storedinthe MemoryIC (IC6004). This data is clearedafterit

is displayed, and thenthe POWER button is pressedback on.

1. With power turned off, press FF and REW buttons on unit

together for over 3seconds. Fig. 1-1

2. TV power goes on and the unitgoes into service mode. 4digitfor

faultcode and communication for I2Cbus code will be displayed.

Fig. 1-2

Fig. 1-3

Fig. 1-4

Fig. 1-5

3. Press anyoperation button except for POWERon either the unit,

or the remote to detect that akeyhas been pressed.

The 1st digitchanges to "0" onlywhen keyisdetected.

Fig. 1-6

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