User Guide

Flow Chart of Troubleshooting
3-3
3-1-2. Initial
Initial Failure
check the pin RSTB
of UCP201 is LOW?
Check UCP201
No
Yes
Yes
END
Yes
Check the Initial Operation
Yes
Check R308, R306, C341
No
check the pin CKI of
UCP201 is 13Mhz?
Check the clock signal
at pin #3 of OSC400
Freq=26Mhz?
No
check
OSC400
1
Check VCCD_2.9V, VCCD_1.
8V of UCP101 "High" when
the phone is boot on?
No
Check UCP101
Yes
2
3
4