Nokia RH-10 Series Troubleshooting Manual page 23

CCS Technical Documentation
Probing
Probing Point Location on
the board
Robin (N601) 2a and 2b,
out=Balun (T604) Figure 1
in
Balun (T604) 3, Figure 1
out=Tomcat
(N603) in
Tomcat (N603) out 4, Figure 1
= TX SAW filter
(Z604) in
TX SAW filter 5, Figure 1
(Z604) out = cell
PA (N801) in
Cell PA (N801) out 6, Figure 1.
= cell isolator Probing here
(Z802) in not recom-
mended unless
necessary; best
to measure on
RF connector
Cell isolator 7, Figure 1.
(Z802) out = cell Probing here
duplexer (Z803) in not recom-
mended unless
necessary; best
to measure on
RF connector
Cell duplexer 8, Figure 1.
(Z803) out Probing here
not recom-
mended unless
necessary; best
to measure on
RF connector
Issue 1 09/2002
Table 2: RF/Analog Probing for Transmitter
Probed Absolute Power (dBm) or
gain/loss (dB) or voltage (v)
Easiest to probe on balun output as
per Table 1. Nominal loss through
balun = 1 dB, but it will appear as
3-4 dB gain due to impedance dif-
ference. On Robin output, you may
see amplitude imbalance between
2 sides of probing point 2 due to
impedance differences (less in
Cell).
See Table 1
Gain = 12-16 dB through Tomcat
Loss = 2-3 dB through SAW filter
PA has variable gain, see Table 1.
Best to measure on RF connector.
Loss = 0.6 dB through isolator. Best
to measure on RF connector as in
Table 1
Loss = 1.3 dB through duplexer
Nokia Corporation
Where to start checking if RF
power not correct (soldering,
shorts, DC power applied if
active, correct voltage of DC
signals, otherwise replace)
N601 (ensure VREFRF02 is 1.35v.
Check AGC voltages/PDMs), T604,
L604, L603, C640, C642, C620,
N603 (including check for 3.6v on
pin 5), D400 (including AGC volt-
age)
T604, L613, C640, C642, L603,
L604, N601. C620, N603 (includ-
ing: check PD_CELL high as in Table
2), N603 (including check for 3.6v
on pin 5 and 2.6v on pin 4)
N603 (also ensure 3.6v on pin 5
and PD_CELL high as in Table 1b),
N601, C649, C639, Z604, N801
(Vbat)
Z604, N603, N801 (Vbat)
N801 (including: check 3.6v on
Vbat, Z802, R821, R801, R804,
L801, C805, R806, R805, V801),
D400 (including AGC voltage),
N601 (since lref, also check
PA_AGC).
Z802, N801 (Vbat), R821, R801,
Z803
Z802, C801, L812, X800. If no cable
connected to X800, then addition-
ally: L802, R823, L803, R824
Confidential
RH-10
Troubleshooting
Page 23