3-17
5. Tuner/IF circuit
(1) No picture on the TV screen
No picture on the
TV screen
Does the Video signal at
the TU701 Pin19?
Check 34V line.
Check 5.2V line.
Check the liC Clock
signal of µ-com Pin 71.
Is +30V applied to
TU701 Pin 17?
Is +5.2V applied to
TU701 Pin 4?
Does the Clock signal
appear at TU701 Pin 12?
Does the data signal
appear at TU701 Pin 13?
Replace Tuner
Check the signal flow
from TU701 Pin 19 to
IC301 Pin 48.
Does the Video signal at
the IC501 Pin50?
Check the signal flow from
IC501 Pin52 to JK301.
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Check the liC Data signal
of µ-com Pin 72.
NO
Summary of Contents for GC260W
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Page 40: ...3 32 3 33 2 Tuner NICAM A2 Circuit Diagram EE MODE VIDEO TU MODE AUDIO ...
Page 47: ...3 46 3 47 LOCATION GUIDE PRINTED CIRCUIT BOARD DIAGRAMS 1 MAIN P C Board TOP VIEW Solder Side ...
Page 48: ...3 48 3 49 2 MAIN P C Board BOTTOM VIEW LOCATION GUIDE ...
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