Nokia NSW-6 Series Disassembly & Troubleshooting Instructions page 17

PAMS Technical Documentation
Phone doesn't register to the network
or phone doesn't make a call
Analog supply voltage VR6 is > 2.7 V of
Cobba (N250) at C275
Analog reference voltage Vref is 1.5
of Cobba (N250) at C169
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)
SCLK (N880 pin 11)
SDATA (N880 pin 12)
pulses 0 –> 1 during off burst
AGC1 (R758) 0 –> 2.3V max. during receiving burst
AFC (R850) 0 –> 1.2V typ. During receiving burst
Digital data signal IF2AN (R789) –>0.6Vpp, 0–>2.2V DC
Digital data signal IF2AP (R788) –>0.6Vpp, 0–>2.2V DC
Digital data signal IF2DN (C750) –>170 mVpp typ, 0–>2.7V DC
Digital data signal IF2DP (C751) –>170 mVpp typ, 0–>2.7V DC
Frequency is 450MHz
DAX signal (J211) pulses1–>0 during receiving slot
TX control lines:
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)
Analog data signals : TXIN 0–>0.8V DC during transmit slot
TXIP 0–>0.8V DC during transmit slot
TXQN 0–>0.8V DC during transmit slot
TXQP 0–>0.8V DC during transmit slot
Used
max, frequency is 12 kHz max
Issue 1 12/99
YES
Check
NO
N250
YES
Check
NO
R256
YES
NO
YES
NO
YES
YES
YES
YES
YES
E Nokia Mobile Phones Ltd.
Disassembly & Troubleshooting
Check
CCONT N150
MAD D202
MAD
D202
NO
COBBA
N250
Check COBBA N250 if DC
fails
NO
Check RF–part if analog
signal fails
Check
NO
N250
Check COBBA N250
if TXC fails
NO
Check MAD D202 if
TXA fails
Check
NO
N250
Check
YES
RF–part
NSW-6
Page 17