Sanyo HV-DX3E Service Manual page 8

B-1. Bad playback quality (1)
Noise appears on the
playback screen.
Is noise diminished by tracking
adjustment.
YES
Noise band is trembled up and
down?
YES
Is there CTL pulse at IC501
pin#97?
YES
Check IC501.
B-2. Bad playback quality (2)
Noise appears on the Full
playback screen.
YES
Are SW pulse and HA SW normal?
YES
ENVE Wave at PT01 pin #4?
YES
Check VIDEO circuit.
NO
Re-adjust PATH.
NO
Noise appears on the screen even
though changing tape.
NO
Is the height of CTL HEAD normal?
No dust?
Is there problem in CTL Input
circuit and amplifier.
Recheck step B-1
(Bad playback quallty (1)).
NO
Are there SW, HA SW pulse at
IC501 pin #16, 18?
YES
NO
Check HEAD AMP connector
and HEAD.
7
TROUBLESHOOTING
YES
Re-adjust PATH.
NO
Re-adjust the height of AC HEAD.
Remove the dust.
YES
Check C510,R545~R547
IC 501 pin #91, 92, 98.
NO
Check IC501.
Check PCB Pattern.