SHARP 21KF80C
Manual de Servicio

21KF-80C

NO PICTURE, NO SOUND

Does the noise level increase at max. Contrast, Brightness and Sound

Noise increase but . No signal is received.

No snow noise.

Check the tuner supply voltage LB must be approx 5V. BT must be approx. 32V, and CH preset data check.

Does noise or signal appear at pin40 of IC801?

Does noise or signal appear at pin38 of IC801?

Check IC801and its related circuit.

Check the Tuner AGC at TP201.

Does noise or signal appear at pin23 and 24 of IC801?

Check Q401, Q402 and its related circuit.

Check pin38 of IC801.

Check pin27 of IC801, Tuner and related circuit.

Check pin1,2 of SF201, Tuner and related circuit.

Check pin37 of IC801and related circuit.

NO SOUND

Does signal appear at pin6 of IC302 / 303?

Check IC3001and its related circuit.

Does signal appear at pin2 of IC302 / 303?

Check Speaker.

Check IC302 / 303 and peripheral circuit.

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