
3-11
4. Y/C CIRCUIT
(1) No Video in EE Mode,
No Video in EE Mode
Check the 19Pin of Tuner.
Does the Video signal
appear at the IC301 Pin48?
Is 5V applied to the IC301
Pins18, 24, 42, 55, 72, 91?
Does the Video signal
appear at the IC301 Pin65?
Does the Video signal
appear at the IC501 Pin19?
Does the Video signal appear
at the Emitter terminal of the
Q309, IC802 Pin 30?
Check the 5.0VT, 5.3VA
Line. (Power Circuit)
Is I
2
C BUS signal applied to
the IC301 Pins68, 69?
Check C316. (AGC)
Chck the path of the signal
between the IC301 Pin65
and IC501 Pin17.
Replace the IC301.
Does the 12VT, 5.3VA appear
at the Emitter terminal of the
Q309 IC802 Pin 2, 4.
Replace the Q309, IC802.
Check the 12VT, 5.4VA
Line. (Power Circuit)
Check the System Circuit.
(Refer to ‘SYSTEM I
2
C BUS
CHECK Trouble Shooting’)
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
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: ......
Page 115: ......