Flow Chart of Troubleshooting and Circuit Diagrams
5-3
5-2 Initial
Initial Failure
After power on,
check and repair the important
signals of U110 as follows
END
No
Downloading SW is OK ?
(Is CSROM signal OK ?)
The node
between R126 and C145
= "H" (RST)
No
Check the circuit
related to reset
R137 = "H" (BOOT)
No
Resolder R137
Yes
R136 = "H" (MSIZE)
No
Resolder R136
Yes
R128 = "L" (EXTPROC)
No
Resolder R138
Yes
Replace PBA
Check all the other connection
by Test S/W
Check the circuit around LCD
Check the circuit
around U113(EEPROM)
and data stored in it
Yes
