Sharp 14A1-RU Manuel de service télécharger pdf (Page 19)

19

14A1-RU

14A2-RU

19-219-1

TROUBLE SHOOTING TABLE

(Continued)

NO PICTURE, NO SOUND

Does noise signal appear at

pin (44) of IC801 ?

NO SOUND

No snow noise.

Does noise or signal appear at pin (40)

of IC801 ?

Noise increases but no signal is

received.

Check the tuner supply voltage LB must

be approx. 5V. BT must be approx, 32V.

And CH preset data check.

Check the tuner AGC

(TP201).

Does noise or

signal appear at

pin (38) of IC801 ?

Check IC801 and

its related circuit.

Check Q205 and

related circuit.

Check pin (1) of

SF201 and Tuner

related circuit.

Check pin (37)of

IC801 and related

circuit.

CheckIC801.

Check C356 and

its peripheral

circuit.

Check pin (27) of

IC801, Tuner and

related circuit.

Check pin(38) of

IC801.

Does the noise level increase at max.

Contrast, Brightness and Sound controls ?

CIRCUITS TO BE CHECKED:

» Tuner.

» PIF.

» Automatic Gain Control.

» (5V), (32V) Power Source.

CIRCUITS TO BE CHECKED:

» Sound system pins (28)

and (44) of IC801.

» Sound Detector Circuit.

» Sound Switch and Att.

Control.

» Audio Output Circuit.

Does signal appear at pins

(6) and (8) of IC301 ?

Check P301 connector of

IC301 and peripheral circuit.

Check Q301, pins(4) and (6)

of IC801 and peripheral

circuit.

Does signal appear at pins(28)

and (29) of IC801?

TROUBLE SHOOTING TABLE

NO RASTER

Blown out.

Replace the fuse.

Check IC701, D701 and

C707.

The fuse is again blown out.

Does horizontal circuit

oscillate ?

Check IC651, IC751 and

IC801.

D1001 (Power LED Red)

turns on or turns ON/OFF.

Check T701 pin (7) voltage

(Approx. 310V at 220V AC)

Check F701.

Check Secondary Main+B

(Approx. 115V)

Check CRT connector K1-

K5 bias.

Check

C787.

Check

IC801.

Checking the

protector circuit.

Check R618 and R615.

D1001 (Power LED Green)

turns on.

Check D758, IC702, IC753

and D762.

Check R701, R707 and

D709.

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