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3-18
6. Tuner/IF CIRCUIT
(A) No Picture on the TV screen
No picture on the TV
screen
Does the Video signal at
the TU701 Pin19.
YES
YES
YES
Is 33VT applied to TU701
Pin17?
YES
Is 5VT applied to TU701
Pin4?
NO
Does Sync appear at
IC501 Pin111.
NO
Does the Video signal at
the IC501 Pin19.
YES
NO
Does the Video signal at
the IC301 Pin61.
YES
NO
NO
Does the Video signal at
the IC802 Pin30.
Check the signal flow from IC802
Pin30 to SC901 Pin19.
YES
YES
Check 33VT line.
NO
Check 5VT line.
NO
YES
Does the Clock signal
appear at TU701 Pin12?
Check the lIC Clock Signal
of µ-COM Pin59.
NO
YES
Does the data signal
appear at TU701 Pin13?
Replace Tuner.
Check the signal flow from
TU701 Pin19 to IC301 Pin48.
Check the signal from IC301
Pin65 to IC501 Pin17.
Check the signal from IC501
Pin19 to IC301 Pin56.
Check the signal from IC501
Pin61 to IC802 Pin1.
Check the lIC Data Signal
of µ-COM Pin60.
NO
Summary of Contents for DVP 721VR
Page 36: ...3 32 3 33 2 POWER SMPS CIRCUIT DIAGRAM 2 ...
Page 37: ...3 34 3 35 3 TU IF NICAM A2 CIRCUIT DIAGRAM EE MODE VIDEO TU MODE AUDIO ...
Page 40: ...3 40 3 41 6 SCART JACK CIRCUIT DIAGRAM ...
Page 45: ...3 50 3 51 PRINTED CIRCUIT DIAGRAMS 1 MAIN P C BOARD VCR DVD _SOLDER SIDE LOCATION GUIDE ...
Page 46: ...3 52 3 53 2 MAIN P C BOARD VCR DVD _COMPONENT SIDE LOCATION GUIDE ...
Page 60: ...3 68 F FE RFL FIG 7 2 DVD F FE RFL FIG 7 3 CD ...
Page 61: ...3 69 F FE RFL FIG 7 4 CD 8 FOCUS ON WAVEFORM FE FOSO F F FIG 8 1 DVD ...
Page 65: ...3 73 13 MT1389 AUDIO OUTPUT TO AUDIO DAC 2 COMPOSITE VIDEO SIGNAL FIG 12 2 FIG 13 1 ...
Page 66: ...3 74 FIG 14 1 14 AUDIO OUTPUT FROM AUDIO DAC ...
Page 71: ......
Page 72: ...3 79 3 80 CIRCUIT DIAGRAMS 1 SYSTEM CIRCUIT DIAGRAM ...
Page 73: ...3 81 3 82 2 RF DSP SERVO CIRCUIT DIAGRAM ...
Page 74: ...3 83 3 84 3 AV JACK CIRCUIT DIAGRAM ...
Page 107: ......
Page 113: ......
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