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ORDER No. SM-98022

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: Aerial Impedance: Stand-by Power Consumption: Receiving System: 85W 75 unbalanced, Coaxial Type AV2 OUT Video (21 pin) 1V p-p 75 Audio (21 pin) 500mV rms 1k Selectable Output (21 pin) Audio (RCAx2) 500mV rms10k Video (RCAx1) 1V p-p 75 28,5kV ±1kV {28,2kV ±1kV} A66ECF50X41 66cm {A59ECF50X41 59cm} 2 x 15W (Music Power) 8 Impedance 8 Impedance 3,5 mm Remote Control 2 x R6 (UM3) Batteries

AV3 IN High Voltage: Picture Tube: Audio Output: Headphones: Accessories supplied :

1,8W 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 Audio

Dimensions: Height: Width: Depth: Net weight:

596,5 mm 778 mm 479 mm 32kg

{550,5 mm} {730 mm} {478,5 mm} {27kg}

Colour Video/Audio Terminals: AUDIO MONITOR OUT AV1 IN

38,9MHz 34MHz 32,9MHz, 33,4MHz, 33,16MHz 32,4MHz, 40,4MHz, 33,05MHz 32,66MHz 34,47MHz (PAL) 34,5MHz, 34,65MHz (SECAM)

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.

AV1 OUT AV2 IN

Audio (RCAx2) Video (21 pin) Audio (21 pin) RGB (21 pin) Video (21 pin) Audio (21 pin) Video (21 pin) Audio (21 pin) S-Video IN (21 pin)

500mV rms1k 1V p-p 75 500mV rms 10k 1V p-p 75 500mV rms 1k 1V p-p 75 500mV rms 10k Y: 1V p-p 75 C: 0.3V p-p 75

3DQDVRQLF

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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