User Guide

PAMS
Technical Documentation
NSE–8/9
Troubleshooting
Page 12
Issue 1 07/99
Power doesn’t stay on or
phone is jammed
Check that
CCONTCSX J337
is pulsing and that PWRON
(R413) is high.
Software is able to run in phone,
acknowledging watchdog.
If power is switched off after a few
seconds, check circuit arround V109.
Yes
Connect R424 to GND
Check
VBB typ 2.8V at C117
and
VXO typ 2.8V at C102
and that they are
stable
No
N100 circuitry is faulty
No
Yes
C
Switcher
Call
Power doesn’t
stay on or phone is
jammed in idle
or call mode
Switcher
No call
Call
Is
Vdc_out stable
and within
limits?
Yes
No
Is
C109 voltage <4,2V or
>3,1V ?
No
Switcher
Yes
Figure 4–6
The LABEL “C” refers to Figure 4–3, The Label “Switcher” referes to Fig-
ure 4–2