Phone Register Failure - Nokia NSB-1 Series Troubleshooting Instructions

PAMS
Technical Documentation

Phone register failure

Analog supply voltage VCOBBA is >2.7 V
Supply voltage VCP (N100 pin 32) > 4.8 V
Supply voltage VRX (N100 pin 11) > 2.7 V
Supply voltage VSYN_A (N100 pin 15) > 2.7 V
Supply voltage VSYN_D (N100 pin 4) > 2.7 V
Synthesizer lines: SEna (N401 pin 56),
RF control lines: AGC (N300 pin 18) 0 –> 2.3 Vmax during receiving slot
Analog data signal RxIP (N300 pin 22) 0–> 1.5 V DC during receiving slot
Analog data signal RxIN (N300 pin 23) 0–> 1.5 V DC during receiving slot
Used benefit signal is biased to DC and its amplitude is 50 mVpp
DAX signal (N300 pin 48) pulses 1 –> 0 during receiving slot
RF control lines: TxC (N300 pin 17) 0 –> 2.3 Vmax during transmit slot
Analog data signals: TxIN (N300 pin 13) 0–> 0.8 V DC during transmit slot
Used benefit signal is biased to DC and its amplitude is 300 mVpp
Original 06/98
Phone doesn't register to the network
or
phone doesn,t make a call
YES
at pin 7,12 ... of Cobba (N300)
YES
Analog reference voltage Vref is 1.5 V
at pin 9 of Cobba (N300)
YES
during the receiving slot
Supply voltage VTX (N100 pin 20) > 2.7 V
during the transmitting slot
YES
SClk (N401 pin 54)
SData (N401 pin 55)
pulses 0 –> 1 during receiving slot
YES
AFC (N300 pin 19) 0 – 1.2 V typ. during receiving slot
YES
nominal and frequency is 13 MHz
YES
YES
TxP (D200 pin 176) 0–>1 (2.8 V) during transmit slot
YES
TxIP (N300 pin 14) 0 –>0.8 V DC during transmit slot
TxQN (N300 pin 15) 0 –>0.8 V DC during transmit slot
TxQP (N300 pin 16) 0 –>0.8 V DC during transmit slot
nominal and frequency is 64 kHz
Troubleshooting Instructions
Check
NO
N100
Check
NO
R308
Check
NO
N100, D200
NO
Check
D200
NO
Check
N300
NO
N3000 if DC is failed
RF part if benefit signal is failed
NO
Check
N300
N300 if TxC is failed
NO
D200 if TxP is failed
NO
Check
N300
Check
YES
RF part
NSB–1/3
Check
Check
Check
Check
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