B. Playback Picture Is Not Good Yes Noise Appears On The

Transcript

B. Playback picture is not good YES Noise appears on the screen on the whole. YES Noise appears on the NO screen at the bottom. Check flow A. NO Adjust the PG in YES Is SW-pulse applied to pin 11 of IC 301? YES Is SW-pulse supplied from NO pin 18 of IC 601? SVC mode. Check D.OG input NO and connector Check pattern YES Is Enve. Waveform supplied to pin 4 of PT01? YES Check video circuit. Check connector,and NO Head dust. Change DRUM Ass'y NO C. Auto-stop during playback. Is reel pulse applied to pin 79 and 80 of IC 601? YES Check reel sensor. NO Is D.FG applied to pin 89 of IC 601? NO YES Check IC 601 Check connector and D.FG circuits. D. Drum M/T loading stop. Is motor 12V supplied from P502 pin4? Check D822,D820 NO YES of Line Ever 12V. NO Check power parts. Is D speed CTL from P502 pin 1? Check R508,C514,R509 NO YES Check connector and motor E. Capstan M/T loading stop. Is motor 14V supplied? Check power Part. NO YES Is the input of pin 5 of P501? Check circuit of NO R516,R513,C513,R514…. YES Is pin 4 of P501 14V? YES Check D821 NO Does pin 77 of IC 601 supply C.PWM? NO YES Check connector and motor Check IC 601 F. Drum M/T and capstan M/T rotate at regular speed. (IN REC MODE) Is C.sync applied to pin 58 of IC 601? Check C.sync of video NO YES Check motor IC and pattern. G. Emergency mode when plugging(power cord) Is ever 5V applied? Check power Parts. NO YES Does X602 crystal oscillate? Check IC 601 and X602 NO YES Is CAM SW(SW501) DATA correct? Recheck connector and NO YES Check IC601 CAM SW contact(SW501) H. Cassette is not inserted Is motor 14V supplied? Check power Parts. NO YES CAM DATA is changed when CST IN? YES Check SW501. NO NO Check Deck part. Is 5V supplied at pin 81,82 of IC601? Check pattern NO YES Check IC604 R614,R615 I. LED does not operate Is 5V supplied to pin 37 of IC601? Check power circuit NO YES Is pulse applied to pin 1~5 OF LD701? YES check LD701 Check IC601 NO 3.VIDEO CIRCUIT A.TROUBLESHOOTING OF EE MODE EE MODE Picture NG YES Is video signal input into pin 36, 38 of IC301? Check LINE IN JACK. NO YES Is 5V supplied at pin 16, 55, 58, 87 of IC301? Check power circuit. NO YES Is CLK-DATA signal Check IC 601 pin 71,72. input pin 23,24 of IC 301? NO YES Is signal output from pin 29 of IC301? Check IC 301 pin 26 Q-V sync. NO YES Is signal input into pin 50 of IC601? Check PCB pattern. NO YES Is signal output from pin 52 of IC601? Is 5V supplied at pin 53, 98, 99 of NO IC601? NO YES YES Check IC601. Modulator out. Check power Line out. circuit. B.TROUBLESHOOTING OF PB MODE PB video sgnal missing. YES Is CLK-DATA signal Check IC 601 pin 72, 71. input pin 23,24 of IC 301? YES NO Is envelope out from Is 5V supplied at pin 74 of IC 301? YES NO IC 301 pin 87? YES Check power NO Is SW pulse input into IC301 pin 11? YES circuit. Check IC601 NO pin 18. Clean head or change head Is signal output from IC301 pin 29? YES Is 5Vsupplied at IC301 NO pin 16, 55, 58? YES Check power NO circuit. Change IC301. Is signal input into IC301 pin 20? YES Change IC301. NO Is video signal output from IC301pin 43? YES Change IC301. Check Q303. NO YES Is composite video signal input into IC301 pin 41? YES NO Is composite video signal Is composite video signal Is CLOCK supplied output from IC301 pin 46? NO at IC301 pin 49? NO Change IC301. Does X301 crystal output from IC301pin 29? NO YES oscillate? Check OSD circuit. Change X301. NO C.TROUBLESHOOTING OF REC MODE Record video signal NG. Check EE mode. YES Is luminance and color signal output from Is signal input into NO IC301 pin 36, 38? IC 301 pin 43,57,59? YES Is +5V supplied at IC 301 pin 87? Check power circuit. NO YES Is REC(H) signal supplied IC 301 pin 30? YES Check REC(H). NO Is REC signal output from IC301 pin 84? YES Check video head and connector. Change IC 301. NO D.TROUBLESHOOTING OF OSD Character OSD Character Incorrect. YES Is +5V supplied at IC 601 pin 53, 98, 99? YES Check power circuit. NO Does X602, XS01 crystal oscillate? X602 :14.3181 MHz XS01 : 17.733 MHz YES Change IC 601. Check X602, XS01. NO 4.AUDIO CIRCUIT A. No sound in the EE mode Is 5V supplied to pin 75 of IC301? Check Power circuit. NO YES Is signal input pin 76 of IC301? Check INPUT JACK. NO YES Is 0V supplied to pin 10 of IC301? Check SYSCON circuit. NO YES Is there output at pin 96 of IC301? NO YES Check OUTPUT JACK. Change IC301. B. No sound in the playback mode. YES Is the output at pin 96 of IC301? Is 5V applied to pin 75 of NO IC301? YES Check Modulator or Output JACK Check power NO circuit. YES Is 0V supplied to pin 10 of IC301? Check IC601. NO YES Is 0V Collector of Q203? Check Q203, NO YES Check connector of P201. Q204,Q205. C. No sound in the playback mode after recording. Check the following procedure in RECORD mode. Is the signal supplied to pin 76 of IC301? Check INPUT JACK. NO YES Is pin 10 of IC301 0V? Check IC601. NO YES Is there output at pin 7 of IC301? Check IC301. NO YES Is there 70kHz signal at pin 4 of P201? Is the voltage above 4.8V at NO Collector of Q202? Check Power NO circuit. YES YES Is 5V to Emitter of Q205? Check Power NO circuit. YES Check Q201. Check Q201. Collect:4.8V Base:5.0V Emitter:5.9V YES Clean A/C HEAD and connector of P201. Check P201 and P202. NO