C. PB VIDEO SIGNAL N.G
B . OSD Character N.G
Is envelope outputNOIs on/off 5V supplied toNOCheck power
NO7ICA 01 pin?11ICA 01 , pin?1 2circuit
Is 5V supplied to ICS01 and pins?207Check ON/OFF +5V
YES
YESYES
NOIs sw pulse input toNOCheck IC601
Check oscillation of ICS01 and pins. 1617Check XS01 (17.7MHz)
ICA 01 , pin?4 5 , pin17 18
YES
YES
Claen head or
change head
NO
Check serial data (ICS01 pins)3 4 5Check IC601.
Is signal input toNOCheck QA01,
YES33
IC301 pin?QA02, QA03
YES
Change ICS01 and check OSD circuit.
NO
Is signal outputNOCheck IC301Check power
from IC301 pin2vcc , pin29 24circuit
YES
YES
Check IC301 4NOCheck IC601
pin EE(L)/PB(H) pin29
YES
Change IC301
Is signal inputNO
Check Q302, 303
to IC301 pin?3
YES
Is color signal inputIs C.signal inputCheck QA04, QA05NONO
to IC301 pin?21to IC301 pin?14
YES
Is color signal inputNOCheck X402 and
to IC301 pin?23adjacent circuit.
YESYES
Is composite video signalNO
Change IC301
output from IC301 ?28
YES
Check OSD circuit
2930 |
ACEC
