Sharp VC-G20SM Serviceanleitung Seite 46

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)
NO
inputting at pin (19) of IC201?
YES
Is there luminance signal (approx.0.3Vp-p)
NO
inputting at pin (42) of IC201?
YES
Is there luminance signal (approx.0.5Vp-p)
NO
inputting at pin (26) of IC201?
Is there luminance signal (approx.0.5Vp-p)
NO
inputting at pin (23) of IC201?
YES
Is there luminance signal (approx. 0.5Vp-p),
NO
input and output at pins (13) and (14)
of IC201, respectively?
YES
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 or replace the cylinder.
Check line between pins (18) and (19)
of IC201.
Check line between pins (21) and (42)
of IC201. (C208)
Check line between pins (39) and (26)
of IC201. (C212)
YES
Is there luminance signal (approx.0.5Vp-p)
outputting 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 0V applied
normally to the pin (37) from pin (57) of
IC201? Is the clock signal (approx.
8.86MHz/0.5Vp-p) for the CCD applied
normally to the pin(44)from (69) of IC201?
NO
Check line between pins(24), (23) of IC201
(C210).
Check peripherial circuit of pins(13) and (14)
of IC201. (R201, R202, C203)
Athough picture record is possible, colour does not appear. (E-E mode is possible.)
Is voltage of 5V applied to the chroma
NO
section power terminal at pin(61) of IC201?
YES
NO
Is there audio signal outputted at
pin(11) of IC201?
YES
NO
Is there chroma signal inputted at
pin(58) of IC201?
YES
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)
(EP1)) and pins (92), (91)((EP2)) of IC201?:
YES
Is the supply voltage of 5V(PRE/REC
NO
Vcc) fed to pin (90) of IC201?
Check peripheral circuit pin(61) of IC201 and
PC 5V line.
Check line between pin(60) and pin (46) of
IC201. (C512)
YES
Check whether the pin(73) and (75) of IC201
oscillate 4.43MHz.
Check parts around of X502.
Is there chroma signal inputted at pin(35) of
NO
IC201?
Check line between pin(58) and (35)
of IC201 .
Replace the IC201.