Troubleshooting Chart - Motorola MPx220 Service Manual

Level 1-2 Service Manual

Troubleshooting Chart

Table 4. Level 1 and 2 Troubleshooting Chart
Symptom
1. Telephone will not turn on or stay on.
2. Telephone exhibits poor reception or
erratic operation such as calls frequently
dropping or weak or distorted audio.
3. Display is erratic, or provides partial or
no display.
4. Incoming call alert transducer audio
distorted or volume is too low.
5. Telephone transmit audio is weak.
(usually indicated by called parties
complaining of difficulty in hearing voice).
6. Receive audio from earpiece speaker is
weak or distorted.
7. Telephone will not recognize or accept
SIM card.
8. Keypad not functioning.
Probable Cause
a) Battery either discharged or
defective.
b) Battery terminals open or
misaligned.
c) Keypad defective.
Connections to or from lower PCB
defective.
a) FPC cable faulty.
b) LCM defective.
Speaker defective.
Microphone defective.
a) Connections to or from lower PCB
defective.
b) Speaker defective.
SIM card defective.
Keypad defective.
December 22, 2004
Verification and Remedy
Measure battery voltage across a 50 ohm (>1
Watt) load. If the battery voltage is <3.25 Vdc,
recharge the battery using the appropriate
battery charger. If the battery will not recharge,
replace the battery. If battery is not at fault,
proceed to b.
Visually inspect the battery terminals on both the
battery and the telephone. Realign and, if
necessary, either replace the battery or refer to
a Level 3 Service Center for the battery
connector replacement. If battery terminals are
not at fault, proceed to c.
Replace the keypad as described in the
procedures. Temporarily connect a +3.6 Vdc
supply to the battery terminals. Press the PWR
button. If unit turns on and stays on, disconnect
the dc power source and reassemble with the
new keypad.
Check connection between the antenna and the
lower PCB.
Check general condition of FPC cable and
upper PCB. If the FPC cable and upper PCB are
good, proceed to b.
Replace the LCM. Verify that the fault has been
cleared and reassemble the unit with the new
LCM.
Replace the speaker. Verify that the fault has
been cleared and reassemble the unit with the
new speaker.
Replace the microphone. Verify that the fault has
been cleared and reassemble the unit with the
new microphone.
Check connection between the antenna and the
lower PCB. If the connection is OK, proceed to
b.
Temporarily replace the speaker with a known
good speaker. Ensure good connection. Place a
call and verify improvement in earpiece audio. If
fault is cleared, reassemble the telephone with
the good speaker.
Check the SIM card contacts for dirt. Clean if
necessary, and check if fault has been cleared.
If the contacts are clean, insert a known good
SIM card into the telephone. Power up the unit
and confirm that the card has been accepted. If
the fault no longer exists, replace the defective
SIM card.
Use alcohol to wipe the keypad metal dome.
Check if fault has been cleared. If the fault is still
present, either replace the keypad as described
in the procedures or refer to a Level 3 Service
Center for the keypad metal dome replacement.
Troubleshooting
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