Motorola D10 Service Manual page 137

BenQ
12. Can't
a) Components shift 1. Visually inspect the U2. If the pins of
find SIM
b) Components are
at fault.
c) U3 or U1 is at
fault
13. Can't a) Battery or
charge charger is at fault
the SIM socket is at fault, Disassembly
to replace the U2.
2. Disassembly to visually inspect the
R8, R7, C5, C6, R4, C4 and R13. If
any component isn't contacted well,
replace the components.
3. If they are not shifted, proceed to b
1. Plug in the SIM card to power on the
handset and measure the voltage of
the U2.4 or U2.5. If it isn't equal to 3V
or 5V, check the R8 and replace it.
2. If R8 is ok but U2.4 is still no voltage,
proceed to c.
3. Measure the voltage of the U2.2 if it
goes to high about 3V or 5V. If not,
check the R7 and replace it.
4. If R7 is ok but U2.2 is still no voltage,
proceed to c.
5. Measure the voltage of the U2.1 if it
output a clock about 3V or 5V. If not,
check the R4 and replace it.
6. If R4 is ok but U2.1 is still no voltage,
proceed to c.
7. Measure the voltage of the U2.3 if it
goes to high about 3V or 5V. If not,
proceed to c.
1. If check the b steps and the U2.1,
U2.2, U2.3 or U2.4 is still no signal,
maybe the U3 or U1 is at fault.
2. Replace the U3 then re-check the step
b.
3. If it is still no signal, replace the U1.
2. Use the correct battery and charger to
check the charge function.
3. If charging function is ok, the battery
or charger is illegal.
4. If it still can't charge, proceed to b
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Rev 1.0