RH-3
Troubleshooting - RF
CCS Technical Documentation
Page 50
Nokia Corporation Confidential
Issue 1 06/2003
Tuning Descriptions
Tuning Title
Description
Troubleshooting
Yoda VHF PLL
This is one of the phone’s self-tests
which gives either a
pass
or
fail
result
only. The RX VHF PLL is inside the Yoda
IC. The phone checks the VHF PLL’s lock-
detect bit. If this bit indicates that the
PLL is unlocked, the test will fail.
Check C706, R715, C713, L708, C754, R718,
V701, R720, C757, C756. Also check power
supplies to Yoda, particularly check for 2.7v
on VR5, and on VR7 at C720, check for 1.8v
on VIO at C704. If no fault is found, replace
Yoda (N701).
Jedi VHF PLL
This is one of the phone’s self-tests
which gives either a
pass
or
fail
result
only. The TX VHF PLL is inside the Jedi IC.
The phone checks the VHF PLL’s lock-
detect bit. If this bit indicates that the
PLL is unlocked, the test will fail.
Check C651, R629, C650, L610, C646, R624,
V601, C653, C655, R630, R631, L611, C652,
R626, C648, C647, C608, R604, V602, R601,
C612, R615, C609, C610. Check power sup-
plies to Jedi (N601), particularly ensure 2.7v
on VR5 at C651 and 1.8v on VIO at C608. If
no problems are found, replace Jedi.
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,
then each AGC value is changed one at
a time to make sure that the ADC
changes as each AGC is changed indi-
vidually.
Check the AGC voltages and components of
the associated PDMs. For problems with the
IF or RF AGC, also check Jedi and supporting
components. For PA AGC problems, also
check the PA and supporting components. If
all of the above cases fail, troubleshoot the
TX chain. If all the output powers are pass-
ing, then perhaps the test is failing because
the ADC voltage is wrong (which at this
point we cannot read, so we are measuring
the actual output power). If the voltages are
wrong, then check the power detector at
R814, L803, N805, C803, C807, and also
Jedi. If the voltages are correct and it still
fails, check the UEM ( D200).
TX Detector (PCS)
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,
then each AGC value is changed one at
a time to make sure that the ADC
changes as each AGC is changed indi-
vidually.
Check the AGC voltages and components of
the associated PDMs. For problems with the
IF or RF AGC, also check Jedi and supporting
components. For PA AGC problems, also
check the PA and supporting components. If
all of the above cases fail, troubleshoot the
TX chain. If all the output powers are pass-
ing, then perhaps the test is failing because
the ADC voltage is wrong (which at this
point we cannot read, so we are measuring
the actual output power). If the voltages are
wrong, then check the power detector at
R803, C804, L803, N805, C803, C807, and
also Jedi. If the voltages are correct and it
still fails, check the UEM (D200).
