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Troubleshooting
START
Is thermistor problem?
(check it using Gate22
processing test)
Put the phone in
test mode and
enter 500255#
Is there approx. EXT_B+
voltage on Pin 3 of
Q900?
Is there 0 Volt on Pin 4
of Q900 ?
Is there approx. EXT_B+
voltage on Pin 1 of J604
Check for intermittent
problems.
Figure 36. No Charging
50
YES
NO
Without battery, is there
2.7 Volts on Pin 1 of U905?
(must be 0 Volt with battery)
NO
Check R913
YES
NO
Check U900 Note 1
or Faulty.
YES
NO
Check Q900 Note 1
or Faulty and J604
YES
MOTOROLA CONFIDENTIAL - PROPRIETARY
November 20, 2000
Is there 2.7 Volt on
NO
BATT_THERM
terminal on Pin 3 of
J604 ?
YES
YES
Note 1.
Product Family 38C
Check Q914 and U905
Note 1 or Faulty.
NO
Check U905 and Q908
Note 1 or Faulty.
Check U800 Note 1
or Faulty.
Note 1: Check components for correct
orientation, cold solder joints, physical
damage, and functionallity.
000797-O
6881036B20
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Table of Contents
Troubleshooting
