5. Troubleshooting
5-8
SAM4S ER-280 SERIES
5-8 MCR & SD CARD Problem
End
MCR Problem
MCR Read
OK?
N
Y
1. Perform the MCR test at H/W test mode.
2. Check the harness between MCR and Main B’D,
if it is connected or not.
3. Check the related Circuit and pattern on Main B’D.
End
SD Problem
SD Read
OK?
N
Y
1. Perform the MCR test at H/W test mode.
2. Check the clock (SD_Xiin : 7.3728MHz)
3. Check the mounted state circuit of SD pin whether pin is open
or short
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