Rf Testpoints - Nokia NSB-7 Series Service Manual

PAMS Technical Documentation

RF testpoints

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