Nokia RH-17 Series Troubleshooting - Rf page 44

RH-17
Troubleshooting — RF
Robin (N601)out=Balun (T604) in
Balun (T604) out=Tomcat (N603)
in
Tomcat (N603) out= TX SAW filter
(Z604) in
TX SAW filter (Z604) out= cell PA
(N801) in
Cell PA (N801) out= cell isolator
(Z802) in
Cell isolator (Z802) out= cell
duplexer (Z803) in
Cell duplexer (Z803) out= RF Con-
nector (X814) in.
Page 44
TP2a and TP2b
TP3
TP4
TP5
TP6
TP7, Probing
here not recom-
mend
unless
necessary, best
to measure on
RF connector.
TP8 Probing
here not recom-
mend unless
necessary, best
to measure on
RF connector.
TP9 Probing
here not recom-
mend
unless
necessary, best
to measure on
RF connector
Nokia Corporation
CCS Technical Documentation
Nominal loss N601 (ensure VREFRF02 is 1.35v as
through Balun = in TP17. Check AGC voltages/PDMs
1 dB, but it will as in Table 1, T604, L604, L603,
appear as 3-4 dB C640, C642, C907, N603 (including
gain due to check for 3.6v on pin 5), D400
impedance dif- (including AGC voltage check in
Table 1 ) Remember to check the
ference. On
Robin output you state of FAST_AGC should be High in
may see ampli- Analog mode TP13.
tude imbalance
between 2 sides
of probing point
2 due to imped-
ance differences.
See Table 1. T604, C640, C642, L603, L604(check
that VR2 is 2.8 Vdc @ TP14), N601,
C907, N603 (including check for
3.6v [Vbat TP15] on pin 5 and 2.7v
[enable TP16] on pin 4)
Gain=12-16 dB N603 (also ensure 3.6v on pin 5 and
through Tomcat PD_CELL high, N601, C649, C639,
Z604, N801 (Vbat)
Loss=2-3 dB Z604, N603, C610, N801 (Vbat)
through SAW fil-
ter
PA has variable N801 (including: check 3.6v on Vbat
gain, check Iref TP18), Z802, R805, R801, L801,
Cel at C811. D400 (including AGC voltage check
in Table 1), N601 (check PA_AGC as
in Table 1, also check IREF CEL at PA
TP19) PA_BOOST not used in
Haukka. If gain is insufficient at PA,
press on N801 and check if RF out-
put increases at RF connector.
If yes, ground connection is incom-
plete.
Loss=0.6 dB Z802, N801 (Vbat), R805, R801,
through isolator. Z803
Best to measure
on RF connector.
Loss=1-3 dB Z803, L750, N750, X814. If no cable
through duplexer connected to X814 then additionally
X811.
Confidential Issue 1 04/2003