Motorola D10 Service Manual page 136

BenQ
10.Datacable
a) Components shift 1. Disassembly to visually inspect the J3.
no function
b) Components are
at fault.
c) U1 is at fault
If audio jack (J3) pins don't contact
well with PCB pads, solder the pins
and pads together.
2. Inspect the R72, R32, U9, U8, U10,
R95, R33, R36, R37, R38, C60, C63,
R81, C37, C38 and D21. If any
component isn't contacted well, shift it
back to the right position.
3. If they are not shifted, proceed to b
1. Measure voltage level if VR3 and
VR2B_SW voltage level are equal
2.9V.
2. When datacable is plugged in,
IO13ACCIN detect 0V. Then,
IO3DATA_HP_SEL outputs high level
about 1 ~ 2 sec, and switches to low
level. U8.3 pin connects to U8.4 pin
and U10.3 pin connects to U10.4 pin.
Check if the U8.3 and U8.4 pins are
short. If not, maybe the U8 is at fault.
Replace the U8.
3. Check if the U10.3 and U10.4 pins are
short. If not, maybe the U10 is at fault.
Replace the U10.
4. After IO3DATA_HP_SEL outputs low
level, measure the waveform of the
U10.4 pin. If its voltage level isn't
equal to 2.7 ~ 2.9V, maybe U9 is at
fault. If U9 isn't contacted well or
wrong, replace the component.
5. Measure the voltage of the U3.C6. If it
isn't equal to 1.35 ~ 1.45V, maybe the
R6 or R9 is at fault. Check their
voltage value and replace the
components.
6. If it is not at fault, proceed to c.
1. Measure the waveforms of U8.3 and
U10.3 when data cable function is
executed.
2. If any pin is no signal, maybe U1 is at
fault then replace the U1.
95
Rev 1.0