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Flow Chart of Troubleshooting
10-3
10-1-2. Initial
Initial Failure
check the pin
RSTB of UCP201
is LOW?
Check U201
No
Yes
Yes
END
Yes
Check the Initial Operation
Yes
Check
R177,R178,R131,C127
No
check the pin CKI
of UCP201 is
13Mhz?
Check the clock signal
at pin #3 of OSC100
Freq=26Mhz?
No
check
OSC100
1
Check the pin #9 of
UCP107 is HIGH and pin
#11, #13 is 2.9V?
No
Check UCP107
Yes
2
3
4