Nokia NSW-5 Series Service Manual page 227

PAMS Technical Documentation
Phone doesn't register to the network
Analog supply voltage VR6 is > 2.7 V of
Analog reference voltage Vref is 1.5 V
Check supply voltages for RF:
RX: VR1 (C158), VR2 (C159), VR3 (C160), VR4 (C161),
VR5 (C162), VR8 (N702 pin 14), VR9 (N702 pin 13),
VR10 (N702 pin 12) and V5V (C176)
TX: VR3 (C160), VR7 (C164), VR7_bias (R901),
VR11 (N702 pin 11), VR12 (N702 pin 9) and
TXPWR3 (C903)
Synthesizer lines: SENA2 (N880 pin 13 ),
AGC1 (R758) 0 –> 2.3 V max during receiving burst
AFC (R850) 0 –> 1.2 V typ. during receiving burst
Analog data signal IF2AN (R789) –> 0.2 Vpp, 0–>2.2 V DC
Analog data signal IF2AP (R788) –> 0.2 Vpp, 0–>2.2 V DC
Digital data signal IF2DN (C750) –>170 mVpp typ,
Digital data signal IF2DP (C751) –>170 mVpp typ, 0–> 2.7 V DC
DAX signal (J208) pulses 1 –> 0 during receiving slot
TXC (N750 pin 1, R752) 0 –> 2.3 Vmax during transmit burst
TXA (N750 pin 2, R751) goes 0–>1 (2.8 V) during modulation
TXLX1 (R934 pin 1) and TXLX2 (R934 pin 2) 0–> 1 (2.8 V)
TXLX are low during PL7 to PL2 and high during PL10 to PL 8
Analog data signals: TxIN (N750 pin 10) 0–> 0.8 V DC during transmit slot
Used IQ signals are biased to 0.8V DC and AC amplitude is 400 mVpp
Issue 1 10/00
Disassembly and Troubleshooting Instructions
or phone doesn't make a call
YES
Cobba (N250) at C275
YES
of Cobba (N250) at C169
YES
YES
SCLK (N880 pin 11)
SDATA (N880 pin 12)
pulses 0 –> 1 during off burst
YES
YES
Frequency is 450 MHz
YES
YES
TX control lines:
YES
TxIP (N750 pin 9) 0 –> 0.8 V DC during transmit slot
TxQN (N750 pin 7) 0 –> 0.8 V DC during transmit slot
TxQP (N750 pin 8) 0 –>0.8 V DC during transmit slot
max, frequency is 12 kHz max
E Nokia Mobile Phones Ltd.
Check
NO
N250
Check
NO
R256
Check
NO
CCONT N150
MAD D202
NO
MAD
D202
NO
COBBA
N250
NO
COBBA N250 if DC fails
0–> 2.7 V DC
RF part if AC signal fails
NO
Check
N250
NO
NO
YES
NSW-5
Check
Check
Check COBBA
N250 if TxC is failed
Check MAD
D202 if TXA is failed
Check
N250
Check
RF part
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