User Guide

RH-17
Troubleshooting — RF CCS Technical Documentation
Page 50 Nokia Corporation Confidential Issue 1 04/2003
Table 11: DC Probing for Receiver
Table 12: RF Probing for Cell CDMA Back End Receiver
Batman (N701) out= UEM
(D200) in
TP45
TP46
TP47
TP48
Adjust input fre-
quency at RF
Test Set so it is
offset by 20 kHz.
Measure fre-
quency ampli-
tude and voltage
peak-peak.
Should be 20
kHz signal with
2.75 Vpp.
RX_IF_AGCPDM
value set to –
256.
N701 (VR5, VR7, VIO, ensure 1.35v on
VREFRF01 as in Table 11, also check
RX_IF_AGC as in Table 11, R706, C704,
R705, C706, R435, C428, C435. Check also
the control signals to Batman(N701) PURX
(J402), RF_BUS_EN1X(J608),
RF_BUS_CLK(N507 pin 10) and
RF_BUS_DATA(N507 pin 12).
VHF LO at 256.2 MHz TP49 VHF amplitude is
~ -8 dBm
N701, C701, C714, R703, R702, C715, R704,
V701, C716, L701, C702, R705, C706.
CLK19M2_B at 19.2 MHz TP50 Amplitude of
-24.0 dBm
Check C513
If signal not present continue TS using
Table 6.
Item to check setting
DC probing
location on
board
DC Voltage
Items to check if
voltage incorrect
RX IF AGC See Table 8 for
PDM settings
TP51 See Table 8 for typi-
cal voltages
D400, R435, C428,
C435, N701
GAIN_CTL High=LNA high
gain, Low=LNA
low gain
TP52 High=2.4vmin,
Low=0.3v max
N701, N750, R764,
C753
IF_SEL High=
AMPS, Low=
CDMA
TP53 High=2.4vmin,
Low=0.3v max
N701, N750, R765,
C750
VREFRF01 fixed TP54 1.35 v D200, C706, N701
Alfred (N750) IFA_In=
Alfred (N750) CDMA out=
TP45a This point not 50
ohms. Will
measure approx + 8
to +12 dB gain from
IFA Amplifier. Using
results fromTP39 as
reference.
Ensure IF_SEL low for CDMA and, as in
Table 11), N750, R765, C750, L757 and
also reference next step(TP45b) to
insure that impedance matching com-
ponents from N750 to Z753 are correct.
Alfred (N750) CDMA out=
CDMA RX IF filter(Z753)
in=
TP45b Same results as above
if matching compo-
nents are correct
Check Z753, C784, L764, C781, L762,
C783, C786, C761, L754, C782 and C767
also ensure dc voltage Vrx is present at
L754.