Daewoo DV- K504N-SJ, Technical Manual

Page: 79 / 123

78
TROUBLESHOOTING GUIDES (Continued)
Noise appears
over the entire
screen
YES
Check TS Flowchart (E)
NO
Are SW pulse and
HA SW applied to
PRE-AMP circuit?
YES
NO
Is SW pulse supplied
from pin
8
of IC601
NO Check D.PG input
(IC601 pin
+
)
and connector (P502)
YES
Check pattern
Is Enve.waveform
supplied to at
pin
$
of PT01?
YES
NO
Check VIDEO circuit.
Check connector. Head
Amp and Clean heads.
Is Reel pulse
applied to pin
%
and
^
of IC601?
YES
NO
YES
NO
Check REEL
sensor part.
Is D.FG applied to
pin
=
of IC601
Check connector (P502)
and D.FG circuit (R501)
G.
H.
Is C.FG applied
to pin
‘
of IC601
NO
Check connector (P501)
and C.FG circuit (R504,
C503)
YES
Check IC601
Playback picture
is not good.
Instrument goes
to auto stop during
playback