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5-2 Initial
Initial Failure
No
U401 pin 4 = "H" ?
Check and repair the important signals of U501 as follows
Yes
The node between R505 and C509 = "H" (RST)
No
Check U407
Yes
No
R509 = "H" (BOOT) Resolder R509
Yes
Check all the other connection by Test S/W R526 = "H" (MSIZE)
No
Resolder R526
Yes
Check the circuit around LCD
No
R528 = "L" (EXTPROC) Resolder R528
Check the circuit around U504(EEPROM) and data stored in it Replace PBA
END
Flow chart of trouble shooting
5-3
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