Sanyo HVR-DX610 Service Manual page 14

TROUBLE SHOOTING
YES
Is Envelope output from IC301
pin#79?
YES
Is Y SIGNAL output at IC301
pin#46?
YES
Is Y SIGNAL input at IC301
pin#43?
YES
Is VIDEO SIGNAL output at IC301
pin#65?
YES
Same as EE MODE check.
NO
Is 5V supplied at IC301 pin#91?
YES
Is SW Pulse input at IC301
pin#70?
Is 5V obtained at IC301 pin#24,
NO
42,55,72,91?
YES
Check and Replace IC301.
Does X301(4.43MHz)
NO
oscillate?
NO
Check PATTERN
NO
Check and replace IC301.
13
NO
Check POWER 5V.
NO
Check IC501 pin#18.
YES
Clean head or Replace head.
NO
Check POWER 5V.
YES
Check PATTERN
NO
Replace X301.