Aiwa HV-FX5850 Service Manual page 67

ELECTRICAL TROUBLESHOOTING -12/17
3. Y/C CIRCUIT
(4) When the Video signal doesn't appear on the screen in REC Mode,
Is the EE signal normal?
Is 5V applied to the IC301
Pins 16, 40, 55, 58, 87?
Does PB Mdoe operate
normally?
Does the RF signal appear
at the IC301 Pin 12?
Does the REC RF signal
appear at the IC301
Pin 90?
Check the Drum &
Drum Connector
NO
YES
NO
Check the line of the 5.2V
Line.(Power Circuit)
YES
NO
YES
NO
YES
NO
YES
Check EE Mode.
Check PB Mode.
Is the REC "H" signal
(about 4V) applied to the
IC 301 Pin 30?
YES
Check REC Luminance
Pass & Color Pass.
Check the circuit of the
IC301 Pin 90, 92, 94.
-67-
Check the System of REC
NO
"H". (the IC501 Pin 47
/ the D301)
YES
Replace the IC301.
YES