Checking The Resolution Change Ic Movement - HP WF1907 Service Manual

4.8 Checking the resolution change IC movement

Check +3.3V supply on I306 pin 110, 101, 92, 82, 74, 2, 25,47, 53, 91,
Check +1.8V supply on I306 pin 118, 87, 55, 17, 78, 70, 104, 106.
Check X301 14.318MHz clock input to I306 pin 108 and 109.
Check I306 pin 111 RESETn signal is high level at normal operation.
Check I306 pin 50, 51, 56~59, 119 Boot configure, when Reset signal
Check I306 pin 59~62 SPI ROM interface signal.
Failure Point
I311 failure.
116, 63.
NG
OK
NG
OK
NG
OK
NG
OK
low to high.
NG
OK
NG
OK
Proceed " Checking the DC/DC converter circuit" section.
Proceed " Checking the DC/DC converter circuit" section.
Failure Point
1) Printed wire broke between X301 and I306 pin 108, 109.
2) C362, C373 is short or open.
3) X301 failure.
Failure Point
1) Check I307 pin 2 is low level wait 200~250ms to high level, when
VCC5V is turned on.
2) I307 failure.
3) Printed wire broke between I306 pin 111 and I307.
4) C375 is short.
5) R348 is short or open.
6) I311 failure.
Failure Point
1) Check I306 pin 50, if is low. R358 is open or short.
2) Check I306 pin 51, if is low. R354 is open or short.
3) Check I306 pin 56, if is low. R355 is open or short.
4) Check I306 pin 57, if is low. R356 is open or short.
5) Check I306 pin 58, if is low. R357 is open or short.
6) Check I306 pin 59, if is high. R363 is open or short.
7) Check I306 pin 119, if is high. R351 is open or short.
Failure Point
1) Printed wire broke between I306 pin 59~62 and I309.
2) I309 failure.
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