Tx Tx If 11 Dbm Set Cell Po - Nokia RH-10 Series Troubleshooting Manual

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Disassembly/assembly (12 pages)

Table Of Contents

Table of Contents

CCS Technical Documentation

Manual Verification: Turn on the cell CDMA transmitter in Phoenix, using the RF Main

Mode dialog box, and set it to channel 384. Set modulation to IS95 voice.

Set the TX_IF_AGC PDM to 0 decimal.

Set the PA AGC PDM to +218 decimal.

Set the TX RF AGC PDM to -512 decimal.

Adjust the TX IF AGC PDM so that the transmitted tone at 836.52 MHz measures

+11 dBm +/- 0.5 dB on the antenna connector, using a spectrum analyzer (use 0 as a

starting point).

Note the value obtained in the step above as it will be needed in other Troubleshooting sections.

Write the PDM values listed in the following table into the PA AGC and record the output

power. Check to see if the output power is within the ranges listed on the tuning result

printout. (Limits are not provided in this document as they may change.)

PDM for PA AGC

+218 decimal

-12

-202

-268

-329

-366

Troubleshooting: If the power readings are low, check the AGC voltages as given in

Tables 1 and 4. You can also probe on the PA input as given in Table 2 to find out if the

power level is 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 soldering first, and probe on PA output as a last

resort.