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PAMS Technical Documentation
Disassembly & Troubleshooting
NSB-7
Issue 1 06/00
ã
Nokia Mobile Phones Ltd.
Page 33
RF testpoints
RX
DC levels (oscilloscope)
RF levels (spectrum analyzer)
TX
DC levels
Point:
Signal:
Component:
Comment:
Picture:
RX1
RXIP and RXQP
R530
I/Q signals (67 kHz) from Hagar to
COBBA.
1
RX2
RXIP and RXQP
C520 and C521
Same as RX1 but before AGC state.
2
RX4
DCS LNA ctrl
C642 / V905
~2.8 V burst controls LNA ON/OFF
3
RX5
Rxref
C534 / R533
DC 1.2 V from COBBA to Hagar
na
RX6
VREF_2
C564 / R563
DC 1.5 V from COBBA to Hagar
na
RX7
Vlna
C562
DC 2.8 V from COBBA to Hagar
3
RX8
Vrxrf
C553 / C557
DC 2.8 V from COBBA to Hagar
na
RX9
Vsynte
C 561
DC 2.8 V from COBBA to Hagar
na
Point:
Signal:
Component:
Comment
RX11
1930...1990 MHz
Z600
Second saw-filter DCS output to baluuns, (-41 dBm)
(check level from reference engine)
RX13
1930...1990 MHz
Z620
First saw-filter DCS output to LNA, (-58 dBm)
(check level from reference engine)
Point:
Signal:
Component:
Comment:
Picture:
TX1
TX power level
C714 / R744
PA selection and control
4
TX2
Vdd1
C772 / L752
Battery voltage to PA Vbatt 3.3...4.8 V
5
TX3
TXP
J519
TX control signal (antenna switch,
differential amplifier
TX16
TXVDCS
C747
~2.5 V burst controls antenna switch
6
TX6
TX7
TXVdet
DET0
C731 / R732
R764 / R763
Operating voltage to TX detector 2.8 V
burst and detected TX level to HAGAR
7
TX8
TXQ
R546
TX Q signals from baseband to Hagar (+-
67 kHz, DC level 1.2 V, swing level 1.32 V)
8
TX9
TXI
R541
TX I signals from baseband to Hagar (+-
67 kHz, DC level 1.2 V, swing level 1.32 V)
8
Содержание NSB-7 Series
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Страница 101: ...Programmes After Market Services NSB 7 Series Transceivers Issue 1 06 00 ãNokia Mobile Phones Ltd Product Variants ...
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