Nokia RH-10 Series Troubleshooting Manual page 28

RH-10
Troubleshooting
Probing
Probing point location on
the board
Alfred (N750) 46, Figure 2
mixer out =
CDMA RX IF
saw (Z753) in
CDMA RX IF 47, Figure 2
saw (Z753) out
= Batman
(N701) in
Batman (N701) 38, Figure 3
out = UEM
(D200) in
VHF LO at 39, Figure 2
256.2 MHz
Supply
VR1A
VR1B
VR2
VR3
VR4
VR5
VR6
VR7
VIO
VRX
VPLL
VBAT
Page 28
Table 8: RF Probing for Cell CDMA Back-end Receiver
Probed Absolute Power (dBm) or
gain/loss (dB)
This point not 50 ohms. Will meas-
ure approx. -14 dBm for -52 dBm
input and RX AGC PDM = 225
This point not 50 ohms. Will meas-
ure approx. -47 dBm for -52 dBm
input and RX AGC PDM = 225
Easiest to use RSSI
Table 9: RF DC Power Supplies
Voltage Supplied Components
4.75 VCTCXO, UHF PLL
4.75 Robin
2.78 Robin, Power Detector
2.78 Robin, VCTCXO
2.78 UHF PLL
2.78 Batman
2.78 Robin, UHF PLL
2.78 Batman
1.8 Robin, UHF PLL
1.8 Alfred
2.78 UHF PLL
3.1-4.2 PA
Nokia Corporation
CCS Technical Documentation
What to check if RF power not
correct (soldering, shorts, DC
power applied if active, correct
voltage of DC signals, otherwise
replace)
N750 and supporting components
(ensure BAND_SEL low for Cell
CDMA and high for PCS as in
Table 3d. Also, IF_SEL low for
CDMA), L754, C782, C767, C761,
C786, Z753
Z753, N750 and supporting com-
ponents (including check for proper
voltages on Alfred signaling), L754,
C782, C767, L759, C770, C771,
C772, L760, L761, N701
N701 (VR5, VR7, VIO, ensure 1.35v
on VREFRF01), R705, C704, R706,
C706, C701, C714, R703, R702,
C715, R704, V701, C716, L701,
C702
N701, C701, C714, R703, R702,
C715, R704, V701, C716, L701,
C702, R705, C706
Confidential Issue 1 09/2002