Tx Tx If 11 Dbm Set Cell Po; Tn Tx Rf Agc Cell Po (0) [Or (1), Or (2)] - Nokia NPD-1 Series Troubleshooting - Rf

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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 com-

ponents 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.

TX TX IF 11 dBm Set CELL Po

See previous tuning. This is the part of the previous tuning when the TX IF AGC is

adjusted so that the output power is +11 dBm

The result is a power in dBm. A perfect result would be +11.00 dBm.

Manual Verification: See previous tuning.

Troubleshooting: See previous tuning.

TN TX RF AGC Cell Po (0)

This tuning characterizes the RF AGC curve by entering PDM values to the RF AGC and

measuring the output power.

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.

Set the Cell PA PDM to –329.

Set the TX_IF_AGC to the value determined in tuning TX TX IF 11 dBm Set CELL Po (above

section) to give +11 dBm on the output.

Change the TX RF AGC to the settings in the following table, and measure the TX power

levels, checking to see that they are within the specified range.

Issue 1 11/2002

[or (1), or (2)]

Nokia Corporation

Troubleshooting — RF

Confidential

NPD-1

Page 19

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