Nokia RH-17 Series Troubleshooting - Rf page 50

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