Power Doesn't Stay On Or The Phone Is Jammed - Nokia NSW-6 Series Disassembly & Troubleshooting Instructions

PAMS Technical Documentation

Power doesn't stay on or the Phone is jammed

If this kind of fault has come after flash programming, there are most
probably open pins in ICs. The solder joints of ICs: MAD1 (D202), Flash
(D201) and SRAM (D200) 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 (N150) after 32 sec-
onds, if the watch-dog of the CCONT can not be served by software. The
watch-dog updating can be seen by oscilloscope at J154 (DataselX) of
CCONT. In normal case there is a short pulse from "1" –> 0 every 8 sec-
onds. The power off function of CCONT can be prevented by connecting
a short circuit wire from WDDISX (CCONT E4 (J150)) to ground (J151).
Power doesn't stay on or phone is jammed
CCONT (N150) watchdog is served?
J154 pulses 1 –> 0)
Connect short circuit wire from
Watchdog J150 to ground J151
FLASH (D201) VBB is 2.8V (C203)
PURX (J152) master reset = "1" (2.8 V)
RFC (J255) 19.44 MHz sine wave
Clock signal: 700 mV Vpp typ.
COBBACLK (J210) 9.72 MHz square wave
clock signal 2.80 Vpp
Open pins or faulty circuit:
D202, D200, D201, N150
Issue 1 12/99
YES
Software is able to run
YES
If power is switched off
after few seconds, check
BTEMP (X100 to C168)
lines
OK
NO
VBAT is OK =
3.8V
YES
Sleep clock SLCLK
NO
square wave 32 kHz
YES
Faulty circuit N150
or over loaded PURX line
NO
Check VCXO G850
YES
E Nokia Mobile Phones Ltd.
Disassembly & Troubleshooting
BSI (X100 to C167) and
YES
N150 is faulty
NO
check sleep
clock circuitry
YES (B150, R157...)
NSW-6
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