Panasonic TX-25EX4F User manual

Colour Television

TX-28EX4F

TX-25EX4F

EURO4 Chassis

SPECIFICATIONS

(Information in brackets { } refers to model TX-25EX4F)

Power Source: 220-240V AC, 50Hz

Power Consumption: 85W

Aerial Impedance: 75Ωunbalanced, Coaxial Type

Stand-by Power

Consumption: 1,8W

Receiving System: PAL I,B/G, H, D/K, PAL 525/60

SECAM L/L’, B/G, D/K

M.NTSC

NTSC (AV only)

Receiving Channels:

VHF E2-E12 VHF H1-H2 (ITALY)

VHF A-H (ITALY) VHF R1-R2

VHF R3-R5 VHF R6-R12

UHF E21-E69 CATV (S01-S05)

CATV S1-S10 (M1-M10) CATV S11-S20 (U1-U10)

CATV S21-S41 (HYPERBAND)

Intermediate Frequency:

Video 38,9MHz 34MHz

Audio 32,9MHz, 33,4MHz, 33,16MHz

32,4MHz, 40,4MHz, 33,05MHz

32,66MHz

Colour 34,47MHz (PAL)

34,5MHz, 34,65MHz (SECAM)

Video/Audio

Terminals:

AUDIO MONITOR OUT Audio (RCAx2) 500mV rms1kΩ

AV1 IN Video (21 pin) 1V p-p 75Ω

Audio (21 pin) 500mV rms 10kΩ

RGB (21 pin)

AV1 OUT Video (21 pin) 1V p-p 75Ω

Audio (21 pin) 500mV rms 1kΩ

AV2 IN Video (21 pin) 1V p-p 75Ω

Audio (21 pin) 500mV rms 10kΩ

S-Video IN Y: 1V p-p 75Ω

(21 pin) C: 0.3V p-p 75Ω

AV2 OUT Video (21 pin) 1V p-p 75Ω

Audio (21 pin) 500mV rms 1kΩ

Selectable Output (21 pin)

AV3 IN Audio (RCAx2) 500mV rms10kΩ

Video (RCAx1) 1V p-p 75Ω

High Voltage: 28,5kV ±1kV {28,2kV ±1kV}

Picture Tube: A66ECF50X41 66cm

{A59ECF50X41 59cm}

Audio Output: 2 x 15W (Music Power)

8ΩImpedance

Headphones: 8ΩImpedance

3,5 mm

Accessories

supplied : Remote Control

2 x R6 (UM3) Batteries

Dimensions:

Height: 596,5 mm {550,5 mm}

Width: 778 mm {730 mm}

Depth: 479 mm {478,5 mm}

Net weight: 32kg {27kg}

Specifications are subject to change without notice.

Weights and dimensions shown are approximate.

NOTE: This Service Manual should be used in conjunction with

the EURO4 Technical Guide.

3DQDVRQLF

ORDER No. SM-98022

SCHEMATIC DIAGRAMS FOR MODELS

TX-28EX4F / TX-25EX4F

(EURO-4 CHASSIS)

NOTE

1. RESISTOR

All resistors are carbon ¼W resistor, unless marked otherwise.

Unit of resistance is OHM (Ω) (k=1,000, M=1,000,000)

2. CAPACITORS

All capacitors are ceramic 50V unless marked otherwise.

Unit of capacitance is µF unless otherwise stated.

3. COIL

Unit of inductance is µH, unless otherwise stated.

4. TEST POINT

Test Point Position

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

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. Do not touch the hot part, or the hot and cold parts at the same time, as you are liable to a shock hazard.

b. Do not short circuit the hot and cold circuits as electrical components may be damaged.

c. 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.

d. 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.

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.

This manual suits for next models

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