Check +3.3V supply on I304 pin2.
OK
NG
Proceed " Checking the DC/DC converter circuit" section.
Check +1.2V supply on I305 pin 2.
OK
NG
Proceed " Checking the DC/DC converter circuit" section.
Check X301 27MHz clock input to I308 pin 127 and 128 at TTL level.
OK
NG
Failure Point
1) Printed wire broke between X301 and I308 pin 127, 128.
2) C351, C352 is short or open.
3) R507 is open.
4) X301 failure.
Check I308 pin 125 RSTB signal is high level at normal operation.
OK
Check I308 pin 115,116,117,118
SPI signal.
OK
NG
Failure Point
1) Printed wire broke between I308 pin 115, 116, 117,118 and I309 pin 1,2,
5,6.
2) I309 is failure.
Failure Point
I308 failure.
Failure Point
1) Printer wire broke between I308 pin 125 and
R437
3) I308 is failure.
NG
5.10 Checking the resolution change IC movement
33
Go to cover page
5. Troubleshooting (continued)
ACER H233H
