Flash Programming Doesn't Work - Nokia NSW-6 Series Disassembly & Troubleshooting Instructions

NSW-6
Disassembly & Troubleshooting

Flash programming doesn't work

The flash programming is carried out via the pads accessible from the
back of the phone (using service accessories).
Flash programming doesn't work
PURX (J140) master reset="1"(2.8V)
FLASH (D201) VBB is 2.8V (C203),
SRAM (D200) VBB is 2.8 V (C200),
FLASH VPP is > 2.8 V (C202)
RFC (J250) 19.44 MHz sine wave
Clock signal: 700mV Vpp typ.
COBBACLK (J210) 9.72MHz sq.wave
clock signal 2.80 Vpp
Check the following lines:
FBUSTXD line: J114–>MAD1
FBUSRXD line: J113–>MAD1
M2BUS line: J112 to MAD1
Check also pullup and pulldown resistors
R209, R210, R212
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 (J207), RPMSelX (J208)
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
Page 14
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
VCXO G850
Check sleepclock circuitry
C154, C155, C190
Issue 1 12/99