3-19
7. Tuner/IF CIRCUIT
(1) No Picture on the TV screen
No picture on the TV
screen
Does the Video signal at
the TU701 Pin16.
YES
YES
YES
Is +33V applied to TU701
Pin14?
YES
Is +5V applied to TU701
Pin3?
NO
Does the Video signal
appear at
IC501 Pin 52.
NO
Does the Video signal
appear at
JK901
YES
NO
Check the signal flow from IC501
Pin52 to JK901 Pin Video out.
YES
Check 33V line.
NO
Check 5V line.
NO
YES
Does the Clock signal
appear at TU701 Pin9?
Check the lIC Clock Signal
of µ-COM Pin71.
NO
YES
Does the data signal
appear at TU701 Pin10?
Replace Tuner.
Check the signal from IC301
Pin29 to IC501 Pin50.
Check the signal from IC501
Pin52 to Q924
Check the lIC Data Signal
of µ-COM Pin72.
NO
Summary of Contents for ZDX-313
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Page 40: ...3 35 3 36 2 TU IF CIRCUIT DIAGRAM A B C D E F G H I J K L M N O P Q R S T PB REC...
Page 43: ...3 41 3 42 5 JACK CIRCUIT DIAGRAM A B C D E F G H I J K L M N O P Q R S T...
Page 49: ...3 53 3 54 PRINTED CIRCUIT DIAGRAMS 1 MAIN P C BOARD TOP SIDE...
Page 50: ...3 55 LOCATION GUIDE...
Page 51: ...3 56 LOCATION GUIDE...
Page 52: ...3 57 3 58 2 MAIN P C BOARD BOTTOM SIDE...
Page 53: ...3 59 3 60 4 KEY P C BOARD LOCATION GUIDE 3 POWER P C BOARD LOCATION GUIDE...
Page 54: ......
Page 70: ...3 76 12 ZR36868 AUDIO OUTPUT TO AUDIO DAC 2 COMPOSITE VIDEO SIGNAL FIG 11 2 FIG 12 1...
Page 71: ...3 77 FIG 13 1 13 AUDIO OUTPUT FROM AUDIO DAC...
Page 75: ...3 81 3 82 A B C D E F G H I J K L M N O P Q R S T CIRCUIT DIAGRAMS 1 SYSTEM CIRCUIT DIAGRAM...
Page 76: ...3 83 3 84 2 SERVO CIRCUIT DIAGRAM A B C D E F G H I J K L M N O P Q R S T...
Page 77: ...3 85 3 86 3 AV JACK CIRCUIT DIAGRAM A B C D E F G H I J K L M N O P Q R S T...
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