14GT15 14GT20
14GT15 14GT20
14GT15 14GT20
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<strong>14GT15</strong><br />
<strong>14GT20</strong><br />
TROUBLE SHOOTING TABLE (Continued)<br />
CIRCUITS TO BE CHECKED:<br />
» Tuner.<br />
» PIF.<br />
» Automatic Gain Control.<br />
» (5V), (32V) Power Source.<br />
NO PICTURE, NO SOUND<br />
Does the noise level increase at max.<br />
Contrast, Brightness and Sound controls ?<br />
Noise increases but no signal is<br />
received.<br />
No snow noise.<br />
Check the tuner supply voltage LB must<br />
be approx. 5V. BT must be approx, 32V.<br />
And CH preset data check.<br />
Does noise or signal appear at pin (40)<br />
of IC801 ?<br />
Check the tuner AGC at<br />
TP201.<br />
Does noise or<br />
signal appear at<br />
pin (38) of IC801 ?<br />
Check IC801 and<br />
its related circuit.<br />
Check pin(38) of<br />
IC801.<br />
Check pin (27) of<br />
IC801, Tuner and<br />
related circuit.<br />
Check Q205 and<br />
related circuit.<br />
Check pin (1) of SF201 and Tuner related<br />
circuit.<br />
Check pin (37)of IC801 and related<br />
circuit.<br />
CIRCUITS TO BE CHECKED:<br />
» Sound system pins (28) and<br />
(44) of IC801.<br />
» Sound Detector Circuit.<br />
» Sound Switch and Att.<br />
Control.<br />
» Audio Output Circuit.<br />
NO SOUND<br />
Does noise signal appear at<br />
pin (44) of IC801 ?<br />
Does signal appear at pin(28)<br />
of IC801?<br />
Does signal appear at pins<br />
(6) and (8) of IC301 ?<br />
Check C356 and<br />
peripheral circuit.<br />
CheckIC801.<br />
Check P302 or P301<br />
connector of IC301 and<br />
peripheral circuit.<br />
Check Q301, pins(4) and (6)<br />
of IC801 and peripheral<br />
circuit.<br />
28
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