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