CCS Technical Documentation
Troubleshooting
RH-10
Issue 1 09/2002
Nokia Corporation Confidential
Page 5
Transmitter Troubleshooting
The Diva troubleshooting section includes tuning information, troubleshooting test,
probing points, and block diagrams.
Tuning Information
ST Batman VHFPLL
This is one of the phone’s self-tests, which gives either a Pass or Fail result only.
The VHFPLL is inside the Batman IC. The phone checks the VHFPLL’s lock detect bit. If this
bit indicates that the PLL is unlocked, the test will fail.
Manual Verification:
Turn on the Cell or PCS receiver to any channel and probe at L701
(probing point 39 in Figure 2), using an RF probe connected to a spectrum analyzer tuned
to 256.2 MHz. If the PLL is locked, it will be stable in frequency. If it is unlocked, you may
have to use a wide span to see it since it may be far off frequency.
Troubleshooting:
Check C701, C714, R703, R702, C715, R704, V701, C716, L701, and
C702. Check power supplies to Batman, particularly check for 2.7v on VR5 at C710 and
on VR7 at C708. Check for 1.8v on VIO. If no fault is found, replace N701 (Batman).
ST TX Detector Cell
This is one of the phone’s self-tests, which gives either a Pass or Fail result only.
The phone transmits at several power levels and checks the ADC value of the power
detector. The ADC value is measured first for a set of AGC values, and then each AGC
value is changed individually to ensure that the ADC changes as each AGC change is
made.
Manual Verification:
Using Main Mode, turn on the Cell CDMA TX with the channel set to
384 and turn on IS95 modulation using CDMA control. Using the PDM window, set:
TX_IF_AGC to -100
TX_RF_AGC to -512
PA_AGC to +511
Record the TX signal power from the antenna connector, using a spectrum analyzer cen-
tered at 836.52 MHz. (The self-test measures the power detector reading instead, but at
the present time it cannot be done with Phoenix. An easy way to check functionality
without removing the covers is to check transmitted power.) Transmitter power should be
greater than 24 dBm. (PWR_OUT greater than 1.91v, which corresponds to the power
detector ADC=700.)
For each of the next three cases, TX power should be less than 24 dBm (less than 1.91v
on PWR_OUT).
