TROUBLESHOOTINGTROUBLESHOOTING
C-1. Bad playback quality (1)
D. No broadcasting signal received
Noise appears on theNo broadcasting signal
playback screen.received
YES
Is noise diminished by trackingRe-adjust PATH.NOIs the output at IC501 pin# 61(CLK),Check IC 501.NO
adjustment.60 (DATA) normal?
YESYES
Is SIF,Video output at TMI(RF101)NO
Noise band is trembled up andNONoise appears on the screen evenYESCheck TMI (RF101) Block.
down?though changing tape.Re-adjust PATH.pin#16,19 normal?
YES
YES
Is Video Signal input at IC501NO
Is there CTL pulse at IC501NOIs the height of CTL HEAD normal? Re-adjust the height of AC HEAD.NOCheck IC301.pin#56?
pin#97?No dust?Remove the dust.
YES
YESIs there Video output at P100NO
Check P100
Is there problem in CTL InputCheck IC501.YESCheck C510,R545~R547pin#1?
circuit and amplifier.IC 501 pin #91, 92, 98.YES
Check Video Buffer Q670, Q671
C-2. Bad playback quality (2)
Noise appears on the FullRecheck step B-1
playback screen.(Bad playback quallty (1)).
YES
NOAre there SW, HA SW pulse atNO
Are SW pulse and HA SW normal?IC501 pin #16, 18?Check IC501.
YES
YESCheck PCB Pattern.
NOCheck HEAD AMP connector
and HEAD.ENVE Wave at P502 pin #4?
YES
Check VIDEO circuit.
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