Daewoo DF-4100, Service Manual

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25
WAVEFORMS
24
TROUBLESHOOTING
D. No Hi-Fi playback in record/playback mode (REC MODE)
Are there Audio signal
at IC251 pin#2~11?
Is FM OSC signal at IC251
pin#36?
Check input SCART JACK.
Check input front jack.
Check ICD02(DVD).
Replace DRUM.
YES
NO
NO
NO
Is FM OSC signal at P401 pin#2?
Replace IC251
YES
HEAD CLEANING.
YES
E. No NORMAL AUDIO playback (PLAY MODE)
Is Playback Audio signal at
IC301 pin#11?
Replace IC251.
YES
NO
NO
Is there Playback Normal Audio
signal at IC251 pin #16,17?
Check A/C HEAD and IC301
YES
Check Output JACK.
YES
Is there normal Audio signal at
IC251 pin#17, 18?
NO
Check power circuit.
NO
Voltage at IC251 pin#34 is 12V?
Voltage at IC251 pin#40 and at
IC301 pin#18 is 5V?
F. No Sound in JK101 COAXIAL Jack.
Pin #25 of P100 is Digital
signal SPDIF?
Check JK101 and PCB pattern.
Check MPEG board.
YES
NO
1. VIDEO
!
(IC301-70) 5Vp-p
1V/2msec/cm
REC
!
(IC301-70)5Vp-p
1V/2msec/cm
PLAY
@
(IC301-46) 520mVp-p
200mV/5usec/cm
REC
@
(IC301-46) 520mVp-p
200mV/5usec/cm
PLAY
#
(IC301-43) 520mVp-p
100mV/5usec
REC
#
(IC301-43) 520mVp-p
100mV/5usec
PLAY
$
(IC301-21) 600mVp-p
200mV/2msec/cm
PLAY(SP) VIDEO SW TRIG
$
(IC301-21) 350mVp-p
200mV/2msec/cm
PLAY(EP) VIDEO SW TRIG
%
(IC301-67) 4.6Vp-p
2V/10usec/cm
REC/PLAY
%
(IC301-67) 4.6Vp-p
2V/10usec/cm
PICTURE SEARCH
^
(IC301-65) 2.2Vp-p
500mV/5usec/cm
REC
^
(IC301-65) 2.2Vp-p
500mV/5usec/cm
PLAY
&
(IC301-28) 450mVp-p
200mV/0.1usec/cm