Aiwa VX-S137 Service Manual page 57

Auto tracking doesn't work
Whether does DC level
of IC4001 93rd pin
change with manual
tracking or not?
YES
Whether is VIDEO
SYNC in IC1001 59th
pin or not?
NO
Investigate Y/C circuit.
TROUBLESHOOTING GUIDE
NO
YES
E-25
Investigate IC4001 and cylinder
unit.
Exchange IC1001.