Denon DVD-1720/556 Service Manual

Also see for DVD-1920: Operating instructions Opertating instructions Specifications Service manual Operating instructions

Contents

22DVD-1720/556Is 5V voltage applied to the Pin(1, 24) of IC1402and Pin(4) of IC1403?Replace IC1402or IC1403.Check P-ON+5V line andservice it if detective.Are the video signals outputted to each pinof IC1402 or IC1403?Yes NoYesYesNoIC1402 18PIN S-Y(I/P)IC1402 15PIN Cb/PbIC1402 13PIN Cr/PrIC1403 5PIN S-Y(I)IC1403 6PIN CVBSIC1403 7PIN S-CCheck the periphery of JK1404 from Pins (13, 15,18) of IC1402 and service it if detective.Check the periphery of JK1404 from Pin(6) ofIC1403 and service it if detective.Check the periphery of JK1401 fromPin (5) of IC1403 and service it if detective.Check the periphery of JK1401 fromPin (7) of IC1403 and service it if detective.Are the video signals outputted to the specificoutput terminal?Are the component video signals outputted to theVIDEO OUT terminal (JK1404)?Are the luminance signals outputted to theS-OUT terminal (JK1401)?Are the chroma signals outputted to theS-OUT terminal (JK1401)?NoNoNoNoAre the composite video signals outputted tothe VIDEO OUT terminal (JK1404)?FLOW CHART NO.20Picture does not appear normally.Set the disc on the disc tray, and playback.Are the video signals outputted to each pin ofCN1601 on the AV CBA?Replace the DVD Main CBA Unit or DVD Mechanism.Check the line between each pin of CN1601 andeach pin of IC1402 or IC1403 on the AV CBA,and service it if detective.CN1601 3PIN → IC1403 3PIN S-Y(I)CN1601 10PIN → IC1403 1PIN S-CCN1601 8PIN → IC1402 6PIN S-Y(I/P)CN1601 6PIN → IC1402 9PIN Cb/PbCN1601 4PIN → IC1402 11PIN Cr/PrAre the video signals shown above inputted intoeach pin of IC1402 or IC1403?YesNoNoCN1601 3PIN S-Y(I)CN1601 4PIN Cr/PrCN1601 6PIN Cb/PbCN1601 8PIN S-Y(I/P)CN1601 10PIN S-CIC1403 3PIN S-Y(I)IC1403 1PIN S-CIC1402 6PIN S-Y(I/P)IC1402 9PIN Cb/PbIC1402 11PIN Cr/PrFLOW CHART NO.19Both functions of picture and sound do not operate normally.Replace the DVD Main CBA Unit.Replace the DVD Mechanism.NoYesNo improvement can be found. Original DVD Main CBA Unit is poor.