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21KF-80S
Noise increase 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 at TP201.
Check pin38
of IC801.
NO PICTURE, NO SOUND
Does the noise level increase at
Contrast, Brightness and Sound
Check pin27
of IC801, Tuner
and related
circuit.
NO SOUND
Does
at pin6 of IC302 / 303?
Does
at pin2 of IC302 / 303?
Check Speaker.
max.
Does noise or signal appear
Does noise or
signal appear at
pin38 of IC801?
Does noise or
signal appear at
pin23 and 24
of IC801?
Check pin1,2
of SF201, Tuner
and related
circuit.
signal appear
signal appear
Check IC302 / 303
and peripheral
circuit.
38
No snow noise.
at pin40 of IC801?
Check IC801and
its related
circuit.
Check Q401,
Q402 and its
related
circuit.
Check pin37
of IC801and
related
circuit.
Check IC3001and
its related
circuit.
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