LG TL-AT130M - Manual (Page 20)

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