Nokia NSW-5 Series Service Manual page 224

NSW-5
Disassembly and Troubleshooting Instructions
2. Flash programming doesn't work
The flash programming is done via system connector X100.
Flash programming doesn't work
PURX (J152) master reset = "1" (2.8 V)
FLASH (D201) VBB is 2.8V (C203),
SRAM (D200) VBB is 2.8 V (C200),
FLASH VPP is > 2.7V (C202)
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
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
Check control lines of SRAM and FLASH:
e.g. there is voltage spikes when trying to write
and read something to SRAM and FLASH
RAMSelX (J204), ROM1SelX (J205),
MCURDX and MCUWRX (X200 pins 19 and 18)
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
Figure 2. Troubleshooting diagram 1 in case flash programming does not
work
Page 18
YES
VBAT > 3.0 V
NO
VBB (C166) 2.8 V See section "Phone is totally dead"
VR1 (C158) 2.8 V
YES
NO
YES
YES
OK
OK
OK
E Nokia Mobile Phones Ltd.
PAMS Technical Documentation
NO
Sleep clock SLCLK (J157)
square wave 32 kHZ
YES
Faulty circuit N150
or over loaded PurX line
NO
check buffer V850 and
VCXO G850
Check sleepclock circuitry
B150, R167, R154, R165,
C154, C155 and C156
Issue 1 10/00