Power Doesn't Stay On, Or Phone Is Jammed - Nokia NSE-6 SERIES Service Manual

PAMS
Technical Documentation

Power doesn't stay on, or phone is jammed

If this kind of fault has come after flash programming, there are most
probably open joints in ICs. The solder joints of ICs: MAD2 (D200), Flash
(D220) and SRAM (D230) are to be checked at the extent possible (by
microscope from the side of PCB and lightly pressing components while
switching power on).
Normally the power will be switched off by CCONT (N100) after 30 se-
conds if the watchdog of the CCONT can not be served by software. This
updating can be seen with an oscilloscope at CCONTCSX (J236). In nor-
mal case there is a short pulse from "1" to "0" every 8 seconds. The pow-
er off function can be prevented by connecting WDDIS (J111) to ground.
Power doesn't stay on or phone is jammed
Check C213, R213
YES
NO
RfClk (R213 lower side) 13 MHz sine wave
RFC (C664) 13 MHz
clock signal: 500 mVpp min
800 mV min
NO
Check buffer V660
and VCTCXO G660
Original 08/98
Disassembly & Troubleshooting Instructions
YES
CCONT watchdog is served?
(J236 pulses 1 ––> 0 every 8 sec)
NO
Connect J111 (WDDIS) to GND
OK
VBB (C107 upper side) 2.8 V
VXO (C149 upper side) 2.8 V
YES
Master reset PURX (J227) 2.8 V
YES
YES
Open pins or faulty circuit:
D200, D220, D230, N100, R215
Flashing can give information in deciding
which IC to change. Changed Flash ID
for example indicates Flash failure
YES
Software is able to run
If power is switched off after
few seconds, check BSI and
BTEMP lines
NO YES
VBAT is 3.6 V
NO
Sleep clock SCLK (J228)
square wave 32 kHz
YES
N100 faulty or
overloaded PurX line
NSE–6
N100 faulty
NO
Check sleep clock
circuitry (B101, R154..)
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