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Micro SDCard (Removable Memory)
1.
Tray Det (accessible at R4208) should be low when a tray is not present and high when a tray is present. If R4208
is high and no tray is present, the Detect pin on J4200 is most likely unsoldered
2.
Measure supplies VDD_SDC (at C4413), VDD_P2 (at R4412) Both supplies can toggle between 3 and 1.8V
3.
R4404-R4409 should all be placed. These are series components on CLK, CMD and DATA. Be sure to probe both
sides of the part.
4.
Depending on the type of card placed in the slot you can measure sdc2_clk as 12.5MHz, 25MHz, 50MHz, 100MHz,
200MHz during a read or write operation.
CLK accessible at R4408
5.
Probe SDC2_DATA<3..0>, SDC2_CMD to ensure there is activity on the bus. Start with Data0. R4404-R4407 is
data and R4409 is CMD.
6.
If any line is held low then measure the voltage across the ESD diodes placed on all data and detect line to ensure
you read 0.7V confirming its not shorted to ground.
MOTOROLA CONFIDENTIAL
Moto X Force/DROID Turbo 2
BASEBAND TROUBLESHOOTING GUIDES
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Table of Contents
Troubleshooting
