Test 119 Tn Tx Dc Offset Reference Power - Nokia RH-17 Series Troubleshooting - Rf

RH-17
Troubleshooting — RF
the RF Tuning window, using the below listed values until the minimum carrier maximum
delta is found. Leave Q at 0. On the "values" line, you enter "I,Q". The values, in decimal,
If the minimum is 35 dB or greater, the phone passes. If the minimum is less than 35 dB,
then vary Q in the same manner as I using the above values, holding I constant at the
minimum value determined above, until the delta is at least 35 dB.
Troubleshooting:
Check Robin (N601), UEM (D200), and associated components. Check TP's 1a - 1d.

Test 119 TN TX DC Offset Reference Power

Description of this and next tuning:
The DC offset voltages on the I and Q inputs to the modulator are adjusted for minimal
carrier feedthrough (maximum carrier suppression). Initially the DC offsets are set to a
nominal value, and the power of a tone offset in frequency 20 kHz from the carrier is
measured in dBm and recorded as a reference (in this tuning). Then in the next tuning,
the carrier suppression (delta between center tone and tone that is offset 20 kHz) is
measured. If it passes, it is reported in that tuning. If not, the DC offsets are adjusted
until it passes, and the passing value is reported.
Explanation of Result:
The reported result is the power in dBm of the tone that is offset 20 kHz from the carrier,
as measured on the antenna connector, with the nominal DC offsets applied.
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Confidential Issue 1 04/2003