Level 3~Level 4 Repair - Motorola D10 Service Manual

BenQ
Level 3~ level 4 repair
Symptom Probable Cause
1.Unit a) Battery either
doesn't turn discharged or
on defective.
b) Battery
connector open or
misaligned.
c) Shield case short
with components
d) X1, R56, C1 or
C2
e) C3 or R2 is at
fault.
f) U3 is at fault.
Verification and Remedy
2. Measure battery voltage. If the battery
voltage is <3.2V, recharge the battery
using the appropriate battery charger.
3. If the battery can't be recharge,
replace the battery.
4. If the battery is not at fault, proceed to
b.
1. Visually inspect the battery connectors
on both the battery pack and the unit.
2. Disassembly to check the battery
connectors if it misaligned or short
with the RF or Base-band shielding
cases. If necessary, replace either the
battery or battery connector.
3. If the battery connectors are not at
fault, proceed to c.
1. Visually inspect the RF/BB shielding
case. If they become deformed,
replace the shielding case.
2. If the shielding case are not at fault,
proceed to d.
1. Use the power supply to supply the
VBAT voltage. Then, press the
power-on key. Visually inspect the
current of the handset used.
2. Measure the waveform of the R56.
3. If the waveform isn't the 32KHz clock,
replace the X1, R56, C1 or C2.
4. If they are not at fault, proceed to e.
1. Measure the waveform of the R2.
2. If the waveform isn't the 13MHz clock,
replace the C3 and R2.
3. If they are not at fault, proceed to f.
1. If the current is under 100mA when
power on, check the VR1 (1.8V), VR2
(2.9V), VR2B (2.9V), and VR3 (2.9V)
voltage.
2. If they are not correct, maybe the U3
is at fault. Replace the U3.
90
Rev 1.0