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
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. 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.
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