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Troubleshooting
INITIAL OPERATION
Initial Failure
Check for the clock
signal at U408 pin 83?
'CSROM' signal on U833
(flash rom) pin 26?
Check all the other connection
between U300 (flash rom) and
U450 (kernel)
(E
2
PROM) and data stored in it
5-4
No
Check the clock generation circuit
(related to U201 and U200)
No
Check and repair the important
signals of U408 as follows
U408 pin 28 =
'H' (SYSRST)
pin 37 (BUSREQ), pin 75
(MSIZE) = 'H'
U408 pin 74 =
'H' (EXTPROC)
(REFTXP)
Pin 53 (REFTXN)
(REFADCP)
Pin 58 (REFADCN)
Resolder all pins of U408
No
Yes
Yes
U408
No
Yes
No
Yes
Pin 54
No
3.0V
0V
Pin 56
No
2.6V?
0.3V?
Yes
Check U843
Check R433 and
related circuit
Check R428 and related
circuit
Resolder U408 pin 37, 75
Resolder U408 pin 74
Check R471, R472, R473
Check R470, R435, R469
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