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TROUBLESHOOTING
C-1. Bad playback quality (1)
Noise appears on the
playback screen.
NO
Is noise diminished by tracking
adjustment.
YES
NO
Noise band is trembled up and
Noise appears on the screen even
down?
though changing tape.
YES
NO
Is there CTL pulse at IC501
Is the height of CTL HEAD normal?
pin#97?
YES
Is there problem in CTL Input
Check IC501.
circuit and amplifier.
C-2. Bad playback quality (2)
Noise appears on the Full
playback screen.
(Bad playback quallty (1)).
YES
NO
Are there SW, HA SW pulse at
Are SW pulse and HA SW normal?
YES
NO
Check HEAD AMP connector
ENVE Wave at P502 pin #4?
YES
Check VIDEO circuit.
Re-adjust PATH.
YES
Re-adjust PATH.
NO
Re-adjust the height of AC HEAD.
No dust?
Remove the dust.
YES
Check C510,R545~R547
IC 501 pin #91, 92, 98.
Recheck step B-1
NO
Check IC501.
IC501 pin #16, 18?
YES
Check PCB Pattern.
and HEAD.
8
D. No broadcasting signal received
No broadcasting signal
received
YES
NO
Is the output at IC501 pin# 61(CLK),
Check IC 501.
60 (DATA) normal?
YES
NO
Is SIF,Video output at TMI(RF101)
Check TMI (RF101) Block.
pin#16,19 normal?
YES
Is Video Signal input at IC501
NO
Check IC301.
pin#56?
YES
Is there Video output at P100
NO
Check P100
pin#1?
YES
Check Video Buffer Q670, Q671
TROUBLESHOOTING
9
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