Dc Supply Current Check; Fig 32 Dc Power Supply Diagram - Nokia NPL-4 Series Troubleshooting Instructions

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DC Supply Current Check

For a quick check of DC power supplies refer to the diagram below. Voltage drops are
measured at the respective resistors pads. Note, that not all currents can be checked in
such a way, see the marking <na> (not applicable) in the diagram.
UEM
VR1
VR2
VR3
VR4
VR5
VR6
VR7
V
refRF01
V
refRF02
VBAT
Copyright © 2005 Nokia Corporation. All rights reserved.
Issue 2 05/05
Company confidential
Figure 32: DC Power Supply Diagram
4.78 V [ 4.6V ... 4.9V ]
charge pump (VCP)
2.81 V [ 2.70V ... 2.86V ]
Tx modulator (Vcc_ModOut)
TX buffer & EDGE ALCs (VRF_TX)
2.81 V [ 2.70V ... 2.86V ]
VCTCXO (+VCC)
digital interface (VDIG)
2.81 V [ 2.70V ... 2.86V ]
Rx Front End (VRF_RX)
Bias & Rx CH filters (VF_RX)
RF controls (VPAB_VLNA)
2.81 V [ 2.70V ... 2.86V ]
PLL prescaler (VPRE)
phasing dividers of Rx (VLO)
2.81 V [ 2.70V ... 2.86V ]
BB buffer (VDIG)
2.81 V [ 2.70V ... 2.86V ]
VCO (VCC_VCO)
16 mA [max. 20 mA]
1.36 V [ 1.32V ... 1.38V ]
bias reference (VB_EXT)
100 uA
< na >
4.1 V [ 2.95V ... 4.7V ]
Triple band PA
NPL-4/5/
Troubleshooting Instructions
< na >
< na >
< na >
< na >
R511( =0R )
0 mV/ <4 mA
< na >
< na >
< na >
< na >
< na >
< na >
R500 ( =5.6R )
90 mV/ 16 mA
R525 =4.7k )
x mV/ y mA
< na >
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