6-11
7. Checking the resolution change IC movement
Is there +3.3V supply on IC401 pins 49, 57, 67, 79, 89, 101, 113, 125 ,132,143, 159. Is there
+2.5V SUPPLY ON IC401 PIN 3, 6,14,17, 21,24, 26, 32, 38, 46, 71, 91, 103,123, 145,147,
152;Is there +3.0V supply on IC401 Pin8.
NG
OK
NG
OK
OK
Proceed section 9 “Checking the
operation of CPU”
Is 25MHz clock output from X401 at TTL level?
Failure point
X401 failure
Proceed section 9 “Checking the operation
of CPU”.
Is 25MHz clock input to IC401 pin47 at TTL
level.?