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TROUBLE SHOOTING
This chapter provides trouble shooting information for B173
1. No Power
Change Power
Board
No
Check Short Of
Main Board
Change
Q7,Q8,Q9,U1
Change Y1
Change U3 or
U7
Change U5
RUN Software
ISP
Check Bottom
Board
NO
NO
NO
NO
Check U3 Pin
Pin X1 Clock
No Power
Check CN1
+5V
Yes
Check
Q7,Q8,=1.8V
Yes
Check
Y1=24MHz
Yes
15,16 Clock
Yes
Check U7
Chapter 4
NO
Change U7
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