Sharp DV-NC70U Service Manual - Page 45

FLOW CHART NO.20 Picture (luminance) record is impossible (E-E mode is possible). Although picture record is possible, color does not appear (E-E mode is possible). Is luminance signal (approx. 0.5 Vp-p) NO inputted to the pin(19) of IC201? YES Is luminance signal (approx. 0.3 Vp-p) NO inputted to the pin(42) of IC201? YES Is luminance signal (approx. 0.5 Vp-p) NO inputted to the pin(26) of IC201? YES Check between the pins(18) and (19) of IC201. (Check C206.) Check between the pins(21) and (42) of IC201. (Check C208.) Check between the pins(26) and (39) of IC201. (Check C212.) YES Is luminance signal (approx. 0.5 Vp-p) inputted to the pin(39) of IC201? NO Is voltage 5V applied to the CCD section power terminal pin(36) of IC201? YES Is CCD control voltage approx. 5V applied normally to the pin(37) from the pin(57) of IC201? Is clock signal (approx. 7.16 MHz/ 0.5 Vp-p) for CCD applied normally to the pin(44) from the pin(69) of IC201? Is voltage 5V applied to the chroma NO power terminal pin(61) of IC201? YES Is chroma signal (approx. 143 mVp-p/ NO Burst) inputted into the pin(46) of IC201? YES Check the periphery of pin(61) of IC201 and PC 5V line. Check between the pins(60) and (46) of IC201. (Check C512.) YES Check whether the pins(71) and (73) of IC201 oscillate (3.58 MHz)? Is chroma signal (approx. 180 mVp-p/ NO Burst) inputted into the pin(58) of IC201? YES NO Check between the pins(58) and (35) of IC201. (Check C515.) YES Is chroma signal (approx. 180 mVp-p/ Burst) outputted to the pin(35) of IC201? DV-NC70U/C DV-NC72U 45 Is luminance signal (approx. 0.5 Vp-p) NO inputted to the pin(23) of IC201? YES Is luminance signal (approx. 0.5 Vp-p) NO inputted and outputted to the pins(13) and (14) of IC201, respectively? Check between the pins(23) and (24) of IC201. (Check C210.) Check the pins(13) and (14) of IC201 peripheral circuit. (Check R201, R202, C203) YES SP mode: Is record FM signal (approx. 20 mAp-p) outputted to the pins(88) and (89) (SP1) and pins(86) and (87) (SP2) of IC201? EP mode: Is record FM signal (approx. 20 mAp-p) outputted to the pins(93) and (94) (EP1) and pins(91) and (92) (EP2) of IC201? Check or replace the cylinder. YES NO Is PRE/REC Vcc 5V applied to the pin(90) of IC201?