Flow Chart of Troubleshooting and Circuit Diagrams
5-3
5-2 Initial
Initial Failure
After power on,
check and repair the important
signals of U618 as follows
END
No
Downloading SW is OK ?
(Is CSROM signal OK ?)
The node
between R661 and C712
= "H" (RST)
No
Check the circuit
related to reset
R348 = "H" (BOOT)
No
Resolder R348
Yes
R440 = "H" (MSIZE)
No
Resolder R440
Yes
R438 = "L" (EXTPROC)
No
Resolder R438
Yes
Replace PBA
Check all the other connection
by Test S/W
Check the circuit around LCD
Check the circuit
around U617(EEPROM)
and data stored in it
Yes