TROUBLESHOOTING FLOW CHART
C. PB-Y SIGNAL N.G.
Is envelope output |
| NO | |
from pin 7,11 of IC 401? |
| NO | |
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| ||
YES | |||
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Check
Q409, 410, 411.
Is 5V supplied at pin 1, 2 of IC 401?.
YES
Is SW pulse input at pin 6 of IC 401?.
YES
NO
NO
Check power circuit.
Check pin 18 of IC 601.
Clean head or change head.
Is signal input at pin 39 of IC 301?
YES
Is signal output from
pin 3 of IC 301?
YES
NO
NO
Check PCB PATTERN
and Q408.
Check pin 35 Vcc of IC301.
YES
Check pin 5 EE(L)/PB(H) of IC 301?.
YES
NO
NO
Check power.
Check pin 44 of IC 601.
Change IC 301.
Is signal input into pin 4 of IC 301?
YES
Is signal input into pin 10 of IC 301?
YES
Is signal output from
pin 34 of IC 301?
YES
Is signal input into pin 4 of RL 902?
YES
TERMINAL OUT.
NO
NO
NO
NO
Is signal output from | NO | |
pin 8 of IC 303? |
| |
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| YES |
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Check Q303. |
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Check IC 302 and |
| |
Q311, Q313. |
| |
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| NO |
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| |
Is supplied at | ||
pin 35 Vcc?. |
| |
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| YES |
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Check PCB PATTERN. |
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Check Q301, Q302, Q305.
Check power.
Change IC 301.
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