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10.9 Abnormal Address
((Abnormal Condition on vertical lines(except abnormality in Address Open or Short))
[ COF ]
Address Output-
abnormality
① Logic
Buffer
Check output-signals(18,3pin)
of the VHCT244(IC2602,03,08,
05,07,06,09,00/IC2700,01,05,
02,04,03).
Check output-signal(14pin) of
the VHCT244(IC2661,62,IC2706)
② Logic
Buffer
Check (19,20,24~27,31,32,
55,56,60 ~63,67,68)pin of the
COF CON/80pin
OK
NG
NG
Check each input-signals(2,
17pin) of the VHCT244
Logic Buffer
OK
OK
Reffer to
the table
NG
Output-WAVE of VHCT244(IC2602,
08,07,09,2700,05,04)-18th pin
Output-WAVE of VHCT244(IC2603,
05,06,00,2701,02,03)-18th pin
Output-WAVE of VHCT244(IC2602,
03,08,05,07,06,09,00/IC2700,
01,05,02,04,03)-3th pin
Output-WAVE of VHCT244(IC2602,
08,07,09,2700,05,04)-2th pin
Output-WAVE of VHCT244(IC2603,
05,06,00,2701,02,03)-2th pin
Output-WAVE of VHCT244(IC2602,
03,08,05,07,06,09,00/IC2700,01,
05,02,04,03)-17th pin
COF Fault-Module⋯
Replace
After check
coldsoldering &
Pin-shorting,
Replace the IC
After check Pin-shorting,
coldsoldering & Pin-opening,
Check contact and aligned state
of COF connector
☞ In checking input or output pins,
Check “
No solder/Cold solder/Lead bent”
on Connector Leads