User Guide
RH-17
Troubleshooting — RF CCS Technical Documentation
Page 32 Nokia Corporation Confidential Issue 1 04/2003
Troubleshooting:
If the power readings are low, check the AGC voltages as in Table 1. You can also probe
on the PA input as in Table 2 to find out if the power level is low going into the PA, or if
the power level is correct going into the PA but the PA gain is too low. If the power level
going into the PA is too low, probe the TX chain at all the other points prior to the PA
listed in the table to see where the gain is lacking. When that point is identified, check
the soldering of all related components, and replace components until the fault is found.
If the power on the PA input is not low and the PA AGC voltage is correct, similarly probe
the power at all points after the PA to find the fault, being extremely careful not to short
the probing point to ground because this will instantly destroy the PA. Visually check sol-
dering first, and probe on PA output as a last resort.
Test 52 - 56 TN TX RF AGC Cell Po (0) [or (1), (2), (3), or (4)]
Description:
This tuning characterizes the RF AGC curve by entering PDM values to the RF AGC and
measuring the output power.
Explanation of Result:
The results are TX power readings in dBm of the transmitted signal measured for each of
the listed PDM settings of the Cell TX RF AGC.
Manual Verification:
Turn on the Cell CDMA transmitter in Phoenix using the RF Main Mode window, and set
it to channel 384. Set modulation to IS95 voice In CDMA Control.
In PDM Control window set the Cell PA PDM to -329.
Set the TX_IF_AGC to the value determined in tuning Test 50 above to give +11 dBm on
the output.
Change the TX RF AGC to the settings in the table below, and measure the TX power lev-
els, checking to see that they are within the specified range.
Troubleshooting:
Check Robin (N601) according to Table 2 and Table 3. Also check D400, which generates
PDM for TX RF AGC
Range for output power, in
dBm
-512 decimal 0.5 - 11.5 Po(4)
-67 decimal -3.5 - 9.5 Po(3)
-22 decimal -10.5 - 3.5 Po(2)
+418 -23.5 - -7.0 Po(1)
+511 -41.0 - -21.0 Po(0)