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TROUBLE SHOOTING
1. No Power
Change Power
Board
No
Check Short Of
Main Board
Change
U1,Q7,Q8,Q9,
Q13
Change Y1
Change U3
Change U3
RU Software
ISP
Check Bottom
Board
NO
NO
NO
NO
No Power
Check CN1
+5V
Yes
Check U1=3.3V
Q7,Q8,Q9,Q13=
1.8V==1.8V
Yes
Check
Y1=24MHz
Yes
Check U3 Pin
15,16 Clock
Yes
Check U3
Pin 24 level
Chapter 4
NO
Change U3
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