User Guide

NPE-3
Baseband Trouble shooting PAMS Technical Documentation
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Power doesn’t stay on or phone is jammed
CCONT watchdog is served?
(J100 pulses "1" -> "0")
Software is able to run
Check UI (keys and displ.)
If power is switched off
after few seconds, check
BSI and BTEMP lines
Connect J102 (WDDIS) to GND:
J108 (VBB) = 2.8V
J105 (VXO) = 2.8V
See section: "Phone is dead"
J101 (PURX) = "1" (2.8V)
after 60ms
Check J112 (SLEEPCLK)
= 32KHz square wave
Check sleepclock
circuit:
B110, R111,...
Faulty N102 CCONT
or overloaded PURX line
No No
Yes
Check buffer: V600, R607,...
V600 coll. (RFC)
= 13MHz clock, 200mVpp min.
Check G602
VCXO 26MHz
Yes
Yes
No
Faulty N500 HAGAR
Ok
Faulty circuit:
D301 MAD2, or
D310 SRAM, or
D311 Flash, or
N102 CCONT
Yes
Yes
Yes
No
Flashing can give a hint in
deciding which IC to replace.
E.g. changed Flash ID
indicates faulty Flash