
6-11
7. Checking the resolution change IC movement
Is there +3.3V supply on IC401 pins49, 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
Is 25MHz clock input to IC401 pin47 at TTL
level?
NG
OK
OK
Proceed section 11 "Checking the
DC/DC converter circuit".
Is 25MHz clock output from X401 at TTL
level?
Failure point
X401 failure
Proceed section 7 “Checking the resolution
change IC movement”.