Nokia RH-17 Series Troubleshooting - Rf page 45

CCS Technical Documentation
UHF LO at 1009.62 MHz for chan-
nel 384
At N601 Robin
VHF LO at 346.2 MHz for cell band,
any channel
Power Detector
NOTE: Troubleshooting CDMA transmitter is same as Analog, differences are in PDM set-
tings. See Table 1 for PDM settings.
Item to check
TX RF AGC
TX IF AGC
PA AGC
PD_CELL
VREFRF02
IREF_CEL
Issue 1 04/2003
TP20
TP27
You can take RF
probe and ver-
ify presence of
LO at R613, but
this won't
measure ampli-
tude accurately)
TP33
TP34
Table 3: DC probing for Cell/AMPS Transmitter
DC probing
setting
location on board
See Table 1 TP10
See Table 1 TP11
See Table 1 TP12
High for TX TP16
on, Low for
TX off
fixed TP17
variable TP19
Nokia Corporation
Troubleshooting — RF
Power Check to see if LO is present. If no
approx.5 dBm. LO is present, check N601, C666,
Measured with C519, C514, L501 and N502. Check
RF probe regulator voltages VR2 and VR6 are
at 2.78 Vdc. Proceed to Table 5 for
further UHF LO troubleshooting.
Should measure Check that control voltage at TP28
power at ~ is at 1.45 Vdc. Check loop filter
-6 to -12 dBm. components C612, C613, R607,
Measured with R605, C632, R606. Check Resonant
RF probe components C629, V602, C637,
V601, C630, C631, L611, C638 and
R613. Check VCO_BAND compo-
nents R609 and C618, make sure
voltage VR3 is present at 2.78 Vdc.
Measure accord- Check N806, L801, R805, R801,
ing to Table 4 C807 and N601.
Items to check if voltage
DC Voltage
incorrect
See Table 1 D400 (UPP), R433, C426, R434,
C427, C429, V420, N601, R604
See Table 1 D400 (UPP), R427, C422, R428,
C423, C430, V421, N601, R611,
C607, R601,
Voltage VIO at 1.8 Vdc
See Table 1 D400 (UPP), R430, C424, R431,
C425, C431, V422, N601, R621
High=2.6v N601, C649, N603 (pin 4)
Low=0v
1.35v D200, C606, N601
2.95v PA_AGC, C811, N801, N601,
R630, R621.
Confidential
RH-17
Page 45