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(3) CPU (U10) trouble shooting guide :
YES
YES
YES
Check +3Vs
(pin92)
Check X1
crystal
1. Check C75, C76
2. replace X1
RESET
Successful?
check U18, make sure U18
pin1 has delayed for certain
period of time ,from L go H.
1. Check U9(SRAM), check CPU_LCS_N (pin 58) and
CPU_BHE_N is active?
2. Check U12(Flash), check R68 and CPU_UCS_N (pin
57) is active?
NO
NO