Vco - Nokia NSB-7 Series Service Manual

NSB-7
Disassembly & Troubleshooting
Point: Signal:
TX10 TXC
RF levels
Point: Signal:
TX11 DET0
TX12 RX and TX
TX20 PA output DCS
TX21 Antsw input DCS
TX15 PA input DCS
TX22 PWR detector input

VCO

DC levels
Point: Signal:
VCO1 VCC
VCO2 Vchp
VCO3 VCP
VCO4 VC
RF levels
Point: Signal:
VCO5 3700...3980 MHz
*) RF input signal of PA and VCO operating voltages can be used to check VCO condition
if only 3 GHz spectrum analyzer is available.
Page 34
Component: Comment:
R792 / C792 TX power control voltage from baseband
to Hagar 0...2.2 V burst
Component: Comment:
C790 / C794 Detected TX level to HAGAR
Z670 / ant. Final TX frequency and level,
(28 dBm, GSM1900 / lev 0)
(check level from reference engine)
C743 PA output signal
(check level from reference engine)
Z670 / C721 Antsw input signal
(check level from reference engine)
C734 PA input signal
V760 input / 14 dB below TX output
C733 (check level from reference engine)
Component: Comment:
R807 / C804 2.64 V DC VCO operating voltage
R807 or C783 or 4.7 V DC from reg. N600 to VCO
C560
N600 5.0 V DC from CCONT to reg. N600
R802 / G800 0.5 V...4.2 V burst DC from Hagar to VCO
Component: Comment:
G800 / R805 VCO signal needs 4 GHz spectrum analyser.*)
level ~ 0dBm (check level from reference engine)
ãNokia Mobile Phones Ltd.
PAMS Technical Documentation
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