Sharp XL-DH20NH

XL-DH20NH
6 – 3
5. Does the supply shows as + 3.3 V? No Check supply ( Q210 Pin No.1 ).
Yes
6. Is Reset function OK? No Check U302 pin no 102.
( Waveform drawing Figure 3 )
Yes
7. Is clock frequency shows 16.934MHz? No Check clock circuit ( Y301 , C308 , C309 )
Yes
8. Is the Flash is normal? No Check U302 pin no 102.
Yes
9. Is the SDRAM is normal? No Check U303 pin no 35.
Yes
10. Is the DSP is normal? No Check U302 Data Bus.
Yes
11. Is the Audio out is normal? No Check Audio out circuit ( U302 Pin No.35 and 38 )
or at Audio filter U602 circuits.
10
U302 102
RESET
9
U302 33
RF
Figure 1
Figure 2