Sharp VC-G20SM Serviceanleitung Seite 47

FLOW CHART NO.20 PLAYBACK MODE TROUBLESHOOTING
Playback picture does not appear. (E-E mode is possible)
NO
Is there FM signal (approx. 200mVp-p)
inputted at pin(78) of IC201?
YES
NO
Is there luminance signal input output
at pins (13) and (14) of IC201?.
YES
Is there luminance signal (approx. 0.5Vp-p)
NO
input output at pin (19) of IC201?.
YES
NO
Is there luminance signal (approx. 0.3Vp-p)
input output at pins (42) of IC201?.
YES
Is there luminance signal (approx. 0.5Vp-p) NO
input output at pins (26) of IC201?.
YES
Is there luminance signal (approx. 0.5Vp-p) NO
inputted at pins (23) of IC201?.
YES
Is there luminance signal (approx. 0.5Vp-p)
NO
outputted at pins (52) of IC201?.
YES
See FLOW CHART NO.18 E-E MODE TROUBLESHOOTING..
Check line between pins(79) and (78) of IC201.
YES
YES
Is there luminance signal (approx. 200mVp-p)
outputted at pin(78) of IC201?
YES
Is the supply V-H. SW.P. signal fed to pin
(81) of IC201?.
YES
Check V-H.SW.P. line.
Check peripheral circuit of pins (13) and (14)
of IC201?.
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)
input output at pin (39) of IC201?.
YES
Is voltage 5V applied to the CCD section power terminal at pin (36) of IC201?.
Check line between circuit of pins (24)and(23)
of IC201. (C210).
Replace IC201.
Although picture playback picture is possible, colour does not appear in PAL mode.(E-E mode is possible)
Is voltage of 5V applied to the chroma power
terminal pin(61) of IC201?
YES
Is there chroma signal (approx. 156mVp-p/
burst) inputted at pin (46) of IC201?.
YES
Is there chroma signal (approx. 197mVp-p/
bust) inputted at pin (58) of IC201?.
YES
Is there chroma signal (approx. 300mVp-p)
outputted at pin (55) of IC201?.
YES
Is there chroma signal (approx. 300mVp-p/
YES
bust) inputted at pin (54) of IC201?.
NO
Check line between circuit of pins (55)and
(54) of IC201.
Replace IC201
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?
Check peripherial circuit pin (61) of IC201 and
NO
PC 5V line
Check line between pin (60)and pin (46)
NO
of IC201.(C512).
YES
Check whether the pins (73) and (75)of IC201
oscillate 4.43MHz at PAL/SECAM mode.
YES
Check parts around of X502.
Check line between circuit of pins (58)and
NO
(35) of IC201.
YES
Is there chroma signal (approx. 197mVp-p/
burst) outputted at pin (35) of IC201?.