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TROUBLE SHOOTING
This chapter provides trouble shooting information for AL2023W
1. No Power
Change
Power Board
No
Check Short Of
Main Board
Change
Q3,D1,U1,D2
Change X1
Change U5 or
U4
Change U5
RUN Software
ISP
Check Bottom
Board
All manuals and user guides at all-guides.com
No Power
NO
Check CN1
+12V and +5V
Check D1=1.8V
U1 out=3.3V
NO
NO
X1=24MHz
NO
Check U5 Pin
42,43 Clock
Check U6
Pin 42,43 Clock
- 44 -
Yes
Yes
Check
Yes
Yes
NO
Chapter 4
Change U6
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