Read Sharp VC-M303 (serv.man9) Service Manual online
44
FLOW CHART NO.18 E-E MODE TROUBLESHOOTING
No picture E-E signal.
NO
NO
NO
NO
NO
YES
YES
YES
YES
Is there picture signal inputted
in the pins(28), (30) and (31)
of IC201?
1For ext. input mode.
nCheck line between rear video input terminal and pin(30)<1-scart>
or pin(31)<2-scart> of IC201.
nCheck line front video input terminal and pin(28) of IC201.
2For U/V tuner mode.
nCheck line between video output terminal of tuner and pin(31) of
IC201.
Is the supply voltage of 5V
(Y-Vcc) fed to pin(12) of
IC201?
Check PC 5V line.
NO
Check line between pin(52) of
IC201, and pin(49) of IC701.
YES
YES
YES
Is there a picture signal
outputted in the emitter of
Q708?
Check peripheral circuit of
Q708.
NO
Check the line between Q708
and Q2801. <1-scart models>
Check the line between Q708
and IC2501. <2-scart models>
Is there Y/C serial data and
Y/C clock signal applied to
pins(63) and (62) of IC201?
Check line between pins(63),
(62) of IC201 and pins(56),
(57) of IC701.
NO
Is the supply voltage of 5V
(OSD-Vcc) fed to pin(51) of
IC701?
Replace IC201.
NO
Check PC 5V line.
Is there a picture signal
inputted in the base of
Q2801?<1-scart models>
Is there a picture signal
inputted in the pin(19) of
IC2501?<2-scart models>
YES
NO
Check peripheral circuit of
Q2801. <1-scart models>
Check peripheral circuit of
IC2501. <2-scart models>
Is there a picture signal
outputted in the emitter of
Q2801?<1-scart models>
YES
1Line output : Check the line between Q2801<1-scart models> or
IC2501<2-scart models> peripheral and output
terminal periphery.
2RF output : Check the line between Q708 peripheral and RF
video input terminal of tuner periphery.
Is there a picture signal
outputted in the pin(20) of
IC2501?<2-scart models>
Is there a picture signal
outputted in the pin(52) of
IC201?
Is there a picture signal
inputted in the pin(49) of
IC701?
Is there a picture signal
outputted in the pin(47) of
IC701?
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