NSW-5
Disassembly and Troubleshooting Instructions
PAMS Technical Documentation
Page 18
Issue 1 10/00
Nokia Mobile Phones Ltd.
2. Flash programming doesn’t work
The flash programming is done via system connector X100.
Flash programming doesn’t work
FLASH (D201) VBB is 2.8V (C203),
NO
YES
OK
check buffer V850 and
VCXO G850
YES
PURX (J152) master reset = ”1” (2.8 V)
RFC (J250) 19.44 MHz sine wave
Clock signal: 700 mV Vpp typ.
COBBACLK (J251) 9.72 MHz square wave
clock signal 2.80 Vpp
VBB (C166) 2.8 V
VR1 (C158) 2.8 V
NO
See section ”Phone is totally dead”
YES
Sleep clock SLCLK (J157)
square wave 32 kHZ
NO
Check sleepclock circuitry
NO
Faulty circuit N150
or over loaded PurX line
YES
YES
Check that following lines are correct:
FBUSTXD line: X100 pin13 –> V200 pin 1
FBUSRXD line: X100 pin 12 –> V200 pin 3
M2BUS line: X100 pin 11 –> V201 pin 1
Check also pullup and pulldown resistors
R209, R210, R212
GND: X100 pins 2, 14 –> GND
There could be open pins in circuits D200, D201, D202
(open joints may be detectable with microscope).
If not the PCB or D202, D200, D201, N150 is faulty
VBAT > 3.0 V
B150, R167, R154, R165,
C154, C155 and C156
SRAM (D200) VBB is 2.8 V (C200),
FLASH VPP is > 2.7V (C202)
Check control lines of SRAM and FLASH:
RAMSelX (J204), ROM1SelX (J205),
MCURDX and MCUWRX (X200 pins 19 and 18)
e.g. there is voltage spikes when trying to write
and read something to SRAM and FLASH
OK
OK
Figure 2. Troubleshooting diagram 1 in case flash programming does not
work