Nokia 3390, 3390b, 3395 服务手册
NPB-1NB
Baseband Troubleshooting
PAMS Technical Documentation
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Flash programming doesn’t work
If fault information from Prommer is:
a) MCU doesn’t boot
b) Serial dataline failure
c) Serial clock line failure
b) Serial dataline failure
c) Serial clock line failure
Connect R224 (towards N201)
(WDDISX) to GND.
No
Yes
C211 towards N201
(VBB) = 2.8 V
C518 towards C506
(VXO) = 2.8 V
when PWR switch is
pressed.
See section: (2)
See section: "Phone is dead"
No
R308 (PURX) = "1" (2.8V)
after 60ms
Yes
Check C220 (SLEEPCLK)
= 32KHz square wave
Check sleepclock
circuit:
B200, R214,...
Defective N201 CCONT
or overloaded PURX line
No
Yes
Check buffer: V502, R559,...
V502 coll. (RFC)
= 13MHz clock, 700mVpp typ.
Check G502
VCXO 26MHz
Yes
Yes
No
Defective N500
HAGAR
Ok
Defective D300
MAD2 or D301
Flash
Ok
Defective PCB
No
Yes
Check the following lines:
M-BUS: X202 pin 3 -> X201 pin 4 -> V204 pin 5
FBUS_RX: X202 pin 8 -> X201 pin 2 -> V204 pin 3
FBUS_TX: X202 pin 7 -> X201 pin 1 -> V204 pin 1
GND: X202 pin 4 -> X201 pin 3 -> GND
Check also pull-up and -down resistors:
Check also pull-up and -down resistors:
R304, 302, 307
No