Nokia NPD-1 Series Troubleshooting - Rf page 32

NPD-1
Troubleshooting — RF
Item to
Setting
check
PA_BOOST N/A
Probing
Probing point location on
board
Robin (N601)out = 16a and 16b,
PCS Balun (T603) Figure 5
in
PCS Balun (T603) 17, Figure 5
out = Hornet
(N602) in
Hornet (N602) out 18a for chan-
= PCS TX SAW nels 25-599,
filter (Z601) in 18b for chan-
nels 600-1175,
both Figure 5
PCS TX SAW filter 19a for chan-
(Z601) out = nels 25-599,
switch (N805) in 19b for chan-
nels 600-1175,
both Figure 5
Switch (N805) out 20, Figure 5
= PCS PA (N802)
in
Page 32
Table 3: DC probing for Cell/AMPS transmitter
DC probing
location on DC Voltage
board
N/A N/A
Table 4: RF/Analog Probing for PCS transmitter
Measured power (dBm) using RF
probe, or gain/loss (dB)
Easiest to probe on balun output as
per Table 1. Nominal loss through
Balun = 1 dB, but it will appear as
1-2 dB gain due to impedance. On
Robin output you may see ampli-
tude imbalance between 2 sides of
probing point 16 due to impedance
differences, (less in cell).
See Table 1.
Gain=14.5-17.5 dB through Hornet
Loss=2-3.5 dB through filter
Loss=0.5 – 1.0 dB through switch
Nokia Corporation
CCS Technical Documentation
Items to check if voltage
incorrect
N/A
What to check if RF power not
correct (soldering, shorts, DC
power applied if active, correct
voltage of DC signals, otherwise
replace)
N601 (also check VR2, VR3, VR6,
VRIO, include check of AGCs as in
Table 5, check VREFRF02 as in
Table 5), T603, L609, L610, C624,
C647, L666, C646, L667, C660,
N602 (including check for 3.6v on
pins 7 and 9), D400
T603, L609, L610, C624, C647,
L666, C646, L667, C660, N602
(including check for 3.6v on pins 7
and 9), D400
N602 (including: ensure 3.6v on
pins 7 and 9; ensure PD_PCS high
as in Table 5; and check PCS_CTRL
as in Table 5 according to the
channel used), Z601, C611, C635,
C634, C627, C645, N605 (including
FILSEL1 and FILSEL2 as in Table 5)
N602 (including: ensure 3.6v on
pins 7 and 9; ensure PD_PCS high
as in Table 5; and check PCS_CTRL
as in Table 5, according to the
channel used), Z601, C611, C635,
C634, C627, C645, N805 (including
FILSEL1 and FILSEL2 as in Table 5)
N805 (including FILSEL1 and
FILSEL2 as in Table 5), N802
(including check for 3.6v on Vbat),
C809, C814, C808
Confidential Issue 1 11/2002