LG RC-185 Service Manual page 28

VCR ELECTRICAL TROUBLESHOOTING GUIDE
3. Y/C CIRCUIT
(4) When the Video signal doesn't appear on the screen in REC Mode,
Is the EE signal normal?
YES
Is 5.0V 5.3VA applied to the
IC301 Pins22, 41, 47, 50,
52, 60, 84?
YES
Does PB Mode operate
nomally?
YES
Does the RF signal
appear at the IC301
Pin76?
YES
Does the REC RF signal
appear at the IC301
Pins88, 89, 94, 95?
YES
Check the Drum & Drum
Connector
NO
NO
NO
Is the REC 'H' signal
NO
(about 4V) applied to the
Q307?
Check REC Luminace pass
& Color pass.
NO
Check the circuit of the
IC301 Pin85, 86.
3-14
Check EE Mode.
Check the line of the 5.0V
5.3VA line. (Power Circuit)
Check PB Mode.
Check the System of REC
NO
'H'.(the IC501 Pin27 / the
D301)
NO
YES
Replace the IC301.