LG TL-AT130M Service Manual page 20

ELECTRICAL TROUBLESHOOTING GUIDE
(3) No sound in REC Mode.
NO sound in REC Mode.
YES
Sound is not recorded.
YES
Is Playback O.K.?
YES
Is the Audio signal applied
to the IC301 Pin 76?
YES
Does the Audio waveform appear
at the IC301 Pin 7?
YES
Is 5V applied to the FL401
Pin 2?
YES
Is 3.0~4.5V applied to the Emitter
of the Q481?
YES
Does the Erase signal
appear at the FL401 Pin 6?
YES
Is the Voltage level of the IC301
Pin6 850mVp-p?
SECTION3 ELECTRICAL
NO
Refer to "No sound in PB
Mode,".
NO
Check the path of Line Audio.
NO
Is the "High" signal applied to the
IC301 Pin 10?
YES
Check the IC501 Pin 96
(Audio Mute "H").
NO
Check the line of the 5V
Power Circuit.
NO
NO
Replace the FL401 or the
Q405.
NO
NO
Check the CLK/Date line and
replace the IC301
Check the Audio R/P/E
connector and Head.
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