Sharp 20U250 Manual de servicio - Página 2

Navegue en línea o descargue pdf Manual de servicio para TV Sharp 20U250. Sharp 20U250 47 páginas.

SPECIFICATIONS

Convergence .............................................................................. Self Convergence System

Focus ......................................................................... Electrostatic Focus High Bi-Potential

Sweep Deflection ................................................................................................... Magnetic

Intermediate Frequencies

Picture IF Carrier ............................................................................................... 38.9 MHz

Sound IF Carrier Frequency

5.5 MHz .......................................................................................................... 33.4 MHz

Colour Sub-Carrier Frequency ........................................................................ 34.47 MHz

Power Input ................................................................................... 110 - 240V AC 50/60 Hz

Power Consumption

20U200/250 ............................................................................................................. 94W

51U200/250 ............................................................................................................. 98W

51U500/550 ........................................................................................................... 103W

Audio Power Output Rating ........................................................... 7.5 W + 7.5 W (at Max.)

Speaker

Size ................................................................................................. 10 cm Round (2 pcs.)

Voice Coil Impedance ......................................................................... 16 ohms at 400 Hz

Aerial Input Impedance

VHF/UHF ....................................................................................... 75 ohm Unbalanced

Tuner Ranges

» VHF-Channels ............................................. 1 (44.25 MHz) thru

» UHF-Channels ........................................ 21 (471.25 MHz) thru

Dimensions

Dimensions .............................................................................................. Width: 692.0 mm

Cabinet Material ................................................................................................. All Plastics

Specifications are subject to change without prior notice.

11 (224.25 MHz)

69 (855.25 MHz)

Height: 477.5 mm

Depth: 474.5 mm

Weight (approx.):

20U200/250

24.0 kg

51U200/250

24.5 kg

51U500/550

24.7 kg

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IMPORTANT SERVICE NOTES

Maintenance and repair of this receiver should be done by

qualified service personnel only.

SERVICE OF HIGH VOLTAGE SYSTEM AND

PICTURE TUBE

When servicing the high voltage system, remove static charge from it by

connecting a 10k ohm Resistor in series with an insulated wire (such as a

test probe) between picture tube dag and 2nd anode lead. (AC line cord

should be disconnected from AC outlet.)

1. Picture tube in this receiver employs integral implosion protection.

2. Replace with tube of the same type number for continued safety.

3. Do not lift picture tube by the neck.

4. Handle the picture tube only when wearing shatterproof goggles and after

discharging the high voltage completely

X-RAY

This receiver is designed so that any X-Ray radiation is kept to an absolute

minimum. Since certain malfunctions or servicing may produce potentially

hazardous radiation with prolonged exposure at close range, the following

precautions should be observed:

1. 20U200/250

: When repairing the circuit, be sure not to increase the high

voltage to more than 27.7 kV (at beam 0 mA) for the set.

51U200/250/500/550 : When repairing the circuit, be sure not to increase the high

voltage to more than 28.1 kV (at beam 0 mA) for the set.

2. 20U200/250

: To keep the set in a normal operation, be sure to make it

function on 24.5 kV ± 1.5 kV (at beam 1,100 µA) in the case

of the set.

51U200/250/500/550 : To keep the set in a normal operation, be sure to make it

function on 24.8 kV ± 1.5 kV (at beam 1,100 µA) in the case

of the set.

The set has been factory – Adjusted to the above-mentioned high voltage.

If there is a possibility that the high voltage fluctuates as a result of the

repairs, never forget to check for such high voltage after the work.

3. Do not substitute a picture tube with unauthorized types and/or brands which

may cause excess X-ray radiation.

BEFORE RETURNING THE RECEIVER

Before returning the receiver to the user, perform the following safety checks.

1. Inspect all lead dress to make certain that leads are not pinched or that

hardware is not lodged between the chassis and other metal parts in the

receiver.

2. Inspect all protective devices such as non-metallic control knobs, insulating

fishpapers, cabinet backs, adjustment and compartment covers or shields, isolation

resistor-capacity networks, mechanical insulators and etc.

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