User Guide

RH-17
Troubleshooting — RF CCS Technical Documentation
Page 48 Nokia Corporation Confidential Issue 1 04/2003
Receiver Probing
Table 8: Receiver PDM values
• In AMPS, ensure 210 mV on I,Q traces of Batman out, probing points
TP45 - 48.
• Use CW signal for AMPS, use CDMA signal for CELL. Call box can
generate both.
Table 9: RF Probing for Cell CDMA and AMPS Front End Receiver
PDM
lower
limit
PDM
upper
limit
PDM
Mean
PDM
Mean voltage
RX
Power in
RSSI
AMPS ch 384
LowGain
2 102 55 0.98 -65 dBm should be
within +/-2
dB of actual
RX signal
above -104
dBm, +2/-4
below -104
AMPS ch 384
HighGain
127 215 173 1.19 -65 dBm
CELL ch 384 Low-
Gain
-1 106 60 0.99 -65 dBm
CELL ch 384 High-
Gain
-119 -3 -64 0.78 -95 dBm
Probing point
Probing
location on
the board
Probed
Absolute
Power (dBm),
or gain/loss
(dB)
What to check if RF
power not correct
(soldering, shorts, DC
power applied if active,
correct voltage of DC
signals, otherwise
replace)
RF Connector (X814) out= cell
duplexer (Z803) in.
TP9 Loss=0.2 dB
through X814
X814, X811, X812, L805,
C821 L806 and Z803.
Cell duplexer (Z803) out= Alfred
(N750) in
TP35 Loss= 2 to 4dB
through
duplexer
Z803, L750, N750 (VRX)
Alfred (N750) LNA out= cell RX
saw (Z751) in
TP36 Gain=12-15
dB for high
gain mode
(GAIN_
CTL=high. Use
RF AGC status
window to
monitor state.),
Loss=-3 to –5
dB for low gain
N750 (Also ensure IF_SEL
low for CDMA and high
for AMPS, as in Table 11.
Ensure GAIN_CTL is high
if RX power is below the
LNA switch point.), Z751,
C755, L752, C757, R764,
C753, R765, C750 and
voltage VRX at N750
pin13(2.78 Vdc).