Test 18 Sn Cell Rx Bb Filter; Test 19 And 20 Sn Cell Rx Dc Offset I (Or Q); Test 22 Sn Amps Rx Bb Filter - Nokia RH-17 Series Troubleshooting - Rf

RH-17
Troubleshooting — RF
in mind that if there is a short circuit on the board, then it will get hot very quickly. In
Phoenix, go to ADC readings and verify Power Amplifier Temperature, ADC value will go
down as Temperature goes up.
Troubleshooting
If the phone was recently transmitting in Cell band at full power for an extended period
of time, it is probably hot for that reason. Let it cool down for a few minutes, then try
again. If it still fails, there may either be a short on the board or else a problem with the
PA Temp circuitry. To check PA Temp circuitry, check R808, C231, R207, and D200. If a
short is suspected, check the PA (N801).

Test 18 SN CELL RX BB Filter

Description
This is one of the phone's self-tunings, which tunes the lowpass filter in the Batman IC
(N701), in cell CDMA mode.
Explanation of Result
This self-tuning returns one of the filters tuned parameters, which should be within the
limits.
Manual Verification
Use Batch Tuning window in Phoenix, select RF Tunings and check value.
Troubleshooting
Check Batman (N701) and supporting components.

Test 19 and 20 SN Cell RX DC Offset I (or Q)

Description
This is one of the phone's self-tunings which measures and adjusts the cell band CDMA
receiver DC offsets until they are within the limits.
Explanation of Result
The DC offset is returned for I (or Q).
Manual Verification
Use Batch Tuning window in Phoenix, select RF Tunings and check value.
Troubleshooting
In Phoenix, put phone in local mode, then CDMA RX. Check voltage at Batman (N701) at
test points TP45-TP48 and supporting components at Batman IC.

Test 22 SN AMPS RX BB Filter

Description
This is one of the phone's self-tunings, which tunes the lowpass filter in the Batman IC
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Nokia Corporation
CCS Technical Documentation
Confidential Issue 1 04/2003