Sharp 20U250 Manuale di servizio - Pagina 29

Sfoglia online o scarica il pdf Manuale di servizio per TV Sharp 20U250. Sharp 20U250 47.

DESCRIPTION OF SCHEMATIC DIAGRAM

SAFETY NOTES:

1. DISCONNECT THE AC PLUG FROM THE AC OUTLET BEFORE

REPLACING PARTS.

2. SEMICONDUCTOR HEAT SINKS SHOULD BE REGARDED AS

POTENTIAL SHOCK HAZARDS WHEN THE CHASSIS IS OP-

ERATING.

IMPORTANT SAFETY NOTICE:

PARTS MARKED WITH " å " (

MAINTAINING THE SAFETY OF THE SET. BE SURE TO RE-

PLACE THESE PARTS WITH SPECIFIED ONES FOR MAINTAIN-

ING THE SAFETY AND PERFORMANCE OF THE SET.

SERVICE PRECAUTION:

THE AREA ENCLOSED BY THIS LINE (

CONNECTED WITH AC MAINS VOLTAGE.

WHEN SERVICING THE AREA, CONNECT AN ISOLATING TRANS-

FORMER BETWEEN TV RECEIVER AND AC LINE TO ELIMINATE

HAZARD OF ELECTRIC SHOCK.

) ARE IMPORTANT FOR

) IS DIRECTLY

NOTES:

1. The unit of resistance "ohm" is omitted.

(K = 1000 ohms, M = Meg ohm).

2. All resistors are 1/16 watt, unless otherwise noted.

3. All capacitors are µ F, unless therwise noted. (P = µµ F).

VOLTAGE MEASUREMENT CONDITIONS:

1. Voltage in parenthesis measured with no Signal.

2. Voltages without parenthesis measured with PAL Colour-Signal.

3. All the voltages in each point are measured with high impedence

volt-meter.

WAVEFORM MEASUREMENT CONDITIONS:

1. Colour bar generator signal of 1.8V peak to peak applied at Base

of Video Buffer Amp. Q200.

2. Approximately 4.0 V AGC bias.

20U200, 20U250

51U200, 51U250

51U500, 51U550