Daewoo DV-F24S, Service Manual

Page: 26 / 110

24
4-3. LOGIC CIRCUIT
Digitron does not
operate.
Is +5V supplied to
pin
*
of IC701?
Is –28V supplied to
pin
1
of IC701?
YES
Is +5.8V supplied
from D713's cathode?
NO
A.
Are –20 and –16.5V
supplied to pin
!
and
Y
of G701?
YES
Are CLK signals
supplied to pin
i
of IC701?
YES
Is 5V at pin
&
of IC701?
YES
Check X701.
YES
Check IC701 and
change.
YES
Is the pin
^
of
P605 at +6V?
NO
Check power
Ass'y.
NO
Is the pin
$
of
P605 at –28V?
NO
Are the voltage differences
between cathode and
anode of D610, and D607 +3.9V?
NO
Check IC701.
NO
Change IC701.
NO
Change X701.
NO
YES
Check the connector
and pattern.
Check power ASS'Y.
YES
Change the damaged diode.
NO
NO