PANASONIC TX28EX4F
Manual de Servicio

SCHEMATIC DIAGRAMS FOR MODELS TX-28EX4F / TX-25EX4F (EURO-4 CHASSIS)
IMPORTANT SAFETY NOTICE
Components identified by mark have special characteristics important for safety. When replacing any of these components, use only manufacturer's specified parts.

NOTE
1. RESISTOR All resistors are carbon ¼W resistor, unless marked otherwise. Unit of resistance is OHM (�) (k=1,000, M=1,000,000) CAPACITORS All capacitors are ceramic 50V unless marked otherwise. Unit of capacitance is µF unless otherwise stated. COIL Unit of inductance is µH, unless otherwise stated. TEST POINT Test Point Position

2.

3.

4.

5.

EARTH SYMBOL Chassis Earth (Cold) Line Earth (Hot)

6.

VOLTAGE MEASUREMENT Voltage is measured by a DC voltmeter. Measurement conditions are as follows: Power source AC 220V-240V, 50Hz Receiving Signal Colour Bar signal (RF) All customer controls Maximum position

7. Indicates the Video signal path Indicates the Audio signal path

These schematic diagrams are the latest at time of printing and are subject to change without notice.

REMARKS
a. b. c. d. Do not touch the hot part, or the hot and cold parts at the same time, as you are liable to a shock hazard. Do not short circuit the hot and cold circuits as electrical components may be damaged. Do not connect an instrument, such as an oscilloscope, to the hot and cold circuits simultaneously as this may cause fuse failure. Connect the earth of the instruments to the earth connection of the circuit being measured. Make sure to disconnect the power plug before removing the chassis.

NOTE
1. The Power Supply Circuit contains a circuit area, which uses a separate power supply to isolate the earth connection. The circuit is defined by HOT and COLD indications in the schematic diagram. All circuits, except the Power Circuit, are COLD.

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