Panasonic PT-40LC12 User manual

Order No. MKE0204850C1

Multi Media Display

PT-40LC12 / PT-45LC12

SPECIFICATIONS

1. SAFETY PRECAUSIONS

1.1. GENERAL GUIDELINES

1. For continued safety, no modification of any circuit should be

attempted.

2. Disconnect AC Plug before disassembling this unit.

3. It is advisable to use an isolation transformer in the AC supply before

servicing.

4. 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.

5. After servicing, see to it that all the protective devices such as

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

combinations etc. are properly installed.

6. After servicing, be sure to restore the wires, leads, insulation barriers,

shields, etc.

7. After servicing, make the leakage current checks to prevent the

customer from being exposed to shock hazards.

Caution:

Use a separate Isolation Transformer for this unit when servicing.

1.2. LEAKAGE CURRENT COLD CHECK

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

the plug.

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

skip step 2.

3. Measure the resistance value, with an ohmmeter, between 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 and 12 M . When the exposed metal does not have a

return path to the chassis, the reading must be infinity.

1.3. 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 1.5 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 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 shock hazard, and the receiver should be repaired and

rechecked before it is returned to the customer.

Figure 1

1.4. UV-PRECAUTION

1. Be sure to disconnect the AC Plug when replacing the lamp.

2. Since the lamp reaches a very high temperature during its operation,

wait until it has completely cooled off when replacing the Lamp Unit.

3. The lamp emits small amounts of UV-Radiation.

Avoid direct-eye contact by covering the Lamp and wearing the UV cut

protective glass.

4. The high pressure lamp involves a risk of explosion. Therefore, do not

touch the Lamp Bulb when servicing.

Figure 2

2. PREVENTION OF ELECTROSTATIC 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 and semiconductor "chip"

components. The following techniques should be used to help reduce the incidence of component

damage caused by electro static 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 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 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).

3. OPERATION GUIDE

4. SERVICE NOTES

5. DISASSEMBLY/ASSEMBLY PROCEDURES

5.1. CABINET SECTION

5.2. LARGE VIEW FOR DISASSEMBLY/ASSEMBLY OF CABINET

6. SERVICE FIXTURES AND TOOLS

7. TROUBLESHOOTING HINTS

8. BLOCK DIAGRAMS

9. SCHEMATIC DIAGRAMS

9.1. SCHEMATIC DIAGRAM AND CIRCUIT BOARD LAYOUT NOTES

9.2. INTERCONNECTION SCHEMATIC DIAGRAM

9.3. FRONT JACK SCHEMATIC DIAGRAM

9.4. RGB JACK / OPERATION SCHEMATIC DIAGRAMS

9.5. AUDIO POWER / LAMP THERMISTOR / FRONT THERMISTOR / LAMP

COVER SWITCH SCHEMATIC DIAGRAMS

9.6. WAVEFORMS

10. CIRCUIT BOARD LAYOUT

10.1. FRONT JACK C.B.A. / RGB JACK C.B.A. / OPERATION C.B.A.

10.2. AUDIO POWER C.B.A. / LAMP THERMISTOR C.B.A. / FRONT

THERMISTOR C.B.A. / LAMP COVER SWITCH C.B.A.

11. EXPLODED VIEWS

11.1. MAIN PARTS SECTION (1)

11.2. MAIN PARTS SECTION (2)

11.3. BASE FRAME SCTION

11.4. TV FARME SECTION

11.5. PACKING PARTS AND ACCESSORIES SECTION

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