Sharp VC-780E Service Manual page 38

-/ouU 7
| VC-790ET ;
Linear time counter does not operate.
ay... - Problems
When system sw is in auto position,
the selection of 50/60 Hz in PB mode
does not function well.
Problems
No picture At E-E mode
appears.
At playback of
standard tape
At playback of
the tape
recorded by
oneself
Check if IC802 is defective.
Check if the video signal comes into pin 6 or pin 1
of 1C1502 and goes out of pin 8 of !C1502 (in
tuner mode). _
Check if the video signal comes into pin 1 of K401
and goes out of pin 5 of K401.
Make sure that there appears a normal picture at E-E
mode.
*
Check if the playback FM signal is applied to pin 4
of connector CG.
Check tf the playback FM signal is applied to pins
20 and 21 of 1C301.
Check if Vec SV is applied at pins 7 and 24 of IC401.
Check if the video signal (demodulator output) is
given at pin 9 of IC401.
Check if the video signal is given at pin 25 of |C401.
Check if the base of Q210 is at high level (approx.
4V).
Before this checking, make sure that norma! playback
is possible with standard tape.
38
check. 1f there is FM signalat pin 9 of |C401.
Check if there ts video signal at pin 6 of IC201.
Check tf there ts video signal at pin 10 of iC201.