Sharp VC-S2000HM, Service Manual, Page: 44 / 123

44
VC-S2000HM
FLOW CHART NO.19 RECORDING MODE TROUBLESHOOTING
Picture(Luminance) record is impossible.(E-E mode is possible.)
Is there luminance signal (approx.0.5Vp-p) inputted at pin(19) of IC201?
YES YES YES
NO
Is there luminance signal (approx.0.3Vp-p) inputted at pin(42) of IC201?
YES
NO
Is there luminance signal (approx.0.5Vp-p) inputted at pin(26) of IC201?
YES
NO
Is there luminance signal (approx.0.5Vp-p) inputted at pin(23) of IC201?
YES
NO
Is there luminance signal (approx.0.5Vp-p) input and output at pins(13) and (14) of IC201, respectively? Check or replace the cylinder.
YES
NO
SP mode : Is there record FM signal(approx.20mVp-p) output at pins(88),(89)((SP1)) and pins(86),(87) ((SP2)) of IC201? LP mode : Is there record FM signal(approx.20mVp-p) output at pins(93),(94)((LP1)) and pins(92),(91) ((LP2)) of IC201?
YES
Check line between pin(19) of IC201 and pin (56) of IC2001.
Check line between pins(21) and (42) of IC201.(C208) Check line between pins(39) and (26) of IC201.(C212)
Is there luminance signal (approx.0.5Vp-p) outputted at pin(39) of IC201?
NO
Is voltage 5V applied to the CCD section power terminal at pin(36) of IC201?
YES
Is CCD control voltage approx. 5V applied normally to the pin(37) from pin(57) of IC201? Is clock signal (approx.8.86MHz/0.5Vp-p) for CCD applied normally to the pin(44) from (69) of IC201?
YES
Although picture record is possible, colour does not appear. (E-E mode is possible.)
Is voltage of 5V applied to the chroma section power terminal pin(61) of IC201?
YES YES YES YES
NO
Is there chroma signal inputted at pin(46) of IC201?
YES
NO
Is there chroma signal inputted at pin(58) of IC201?
YES
NO
NO
Check peripheral circuit pin(61) of IC201 and PC 5V line.
Check line between pin(60) and pin(46) of IC201.(C512)
YES
Is the supply voltage of 5V(PRE/REC Vcc) fed to pin(90) of IC201?
NO
Replace IC201.
Check whether the pins(73) and (75) of IC201 oscillate 4.43MHz.
Check parts around of X501.
Is there chroma signal outputted at pin(35) of IC201?
YES
Check line between pins(58) and (35) of IC201.
YES YES
Check line betwen pins(24) and (23) of IC201. (C210) Check peripherlal circuit of pins(13) and (14) of IC201.(R201,R202,C203,C225)
SP mode : Is there chroma ingredient included signal(approx.20mVp-p) output at pins(88),(89)((SP1)) and pins(86),(87)((SP2)) of IC201? LP mode : Is there chroma ingredient included signal(approx.20mVp-p) output at pins(93),(94)((LP1)) and pins(92),(91)((LP2)) of IC201?
Is there luminance signal (approx.0.4Vp-p) inputted at pin(1) of IC2002?
NO
Is there luminance signal (approx.0.4Vp-p) inputted at pin(1) of IC2001?
NO
Check line between pins(3) of IC2001 and pin (1) of IC2002.
Check the voltage of pin(2) of IC2002 on recording mode. Check peripheral circuit of IC2002.
Is there chrominance signal inputted at pin(6) of IC2006? Is there chrominance signal inputted at pin(3) of IC501? Is there chrominance signal inputted at pin(78) of IC201?
NO NO NO
Check line between pins(28) of IC2001 and pin(6) of IC2006.
Check line between pin(4) of IC2006 and pin (3) 0f IC501. Check the voltage of pin(4) of IC501.
Check line between pin(4) of IC501 and pin(97) 0f IC701.
HIGH
Replace IC501.
LOW
LOW
Replace IC2001.
HIGH