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D. PB-C SIGNAL N.G.
Is color signal output
from pin7 of IC 401?
Is color signal input into
pin 15 of IC 301?
Is +5V supplied at
pin 1, 2 of IC 401?.
NO
YES
Check Q409,
Q414, Q415.
NO
Is color signal output from
pin 27 of IC 301?
YES
Is C-ROTARY input into
pin 41 of IC 301?
NO
Check power circuit.
NO
Clean head or change head.
YES
Check pin 15 of IC 601.
NO
YES
Change IC 301.
Is color signal input into
pin 25 of IC 301?
Is 5V supplied at
pin 28 of IC 301?
NO
Check power.
NO
YES
YES
Check X 302.
Check oscillation of
pin 18, 19 of IC 301.
Is composite video signal
output from pin 3 of IC 301?
Check X 301.
Check pin 35 Vcc of IC 301.
NO
NO
YES
YES
YES
Is V composite signal input
into pin 4 of IC 301?
Is signal output from
pin 8 of IC 303?
NO
YES
NO
Is signal input
into pin 4 of X301?
Check PATTERN.
Check Q303.
NO
YES
YES
Is signal output
into pin 1 of X303?
Check X303.
NO
YES
Is signal input
into pin 6 of IC 303?
Check Q370, 371, 372,
373, 374, 375, 378.
NO
YES
Is B/W(H) signal input
into pin 4 of IC 303?
Check pin100 of IC 601.
NO
YES
Change IC 301.
Is composite V-signal output
from pin 34 of IC 301?
Change IC 301.
NO
YES
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