Dc Supply Voltage Check - Nokia RM-94 Rf Troubleshooting Instructions

RM-94
6(b) - RF Troubleshooting

DC Supply Voltage Check

For a quick check of DC power supplies, refer to the diagram below. The RF power supplies
are generated in the UEM and can be measured either in the Small Signal Chamber or in the
Base Band Chamber.
The UEM output voltages can be measured at the respective resistors' / capacitors' pads
marked below in brackets, e.g. < C1234 >.
< C7516 >
< C7510 >
< R7516 >
< C7519 >
< C7517 >
< C7521 >
< C7500 >
< R7511/C7516 >
< R2901/C2901 >
AND
< R2900/C2900 >
Issue 1 04/2005
UEM
4.75 V [ 4.6V ... 4.9V ]
VR1
2.78 V
VR2
2.78 V
VR3
2.78 V [ 2.70V ... 2.86V ]
VR4
2.78 V [ 2.70V ... 2.86V ]
VR5
2.78 V [ 2.70V ... 2.86V ]
VR6
2.78 V [ 2.70V ... 2.86V ]
VR7
16 mA [max. 20 mA]
1.35 V [ 1.32V ... 1.38V ]
V
refRF01
100 uA
1.35 V
V
refRF02
100 uA
2.7 V [ 2.95V ... 4.7V ]
VBAT
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charge pump (VCP)
[ 2.70V ... 2.86V ]
Tx modulator (Vcc_ModOut)
TX buffer & EDGE ALCs (VRF_TX)
[ 2.70V ... 2.86V ]
VCTCXO (+VCC)
digital interface (VDIG)
Rx Front End (VRF_RX)
Bias & Rx CH filters (VF_RX)
RF controls (VPAB_VLNA)
PLL prescaler (VPRE)
phasing dividers of Rx (VLO)
BB buffer (VDIG)
VCO (VCC_VCO)
bias reference (VB_EXT)
[ 1.32V ... 1.38V ]
bias reference
Triple band PA
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(RXIINN, RXQINN)
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