User Guide
CCS Technical Documentation Troubleshooting — RF
RH-17
Issue 1 04/2003 Nokia Corporation Confidential Page 19
Test 13 ST Sleep Clock
Description
The purpose of this test is to verify connections from 32kHz oscillator to the UEM, then
from UEM to SleepClk to the UPP. Also tested is AFCOUT of the UEM to the VCTCXO, and
from VCTCXO to RF clock to UPP are intact. UPP sets AFCR for UEM to set AFCOUT to mid
range. Next, DSP will measure how many 19.2MHz clock cycles are present in 1024
cycles of the 32kHz clock. Next, AFCOUT is set to maximum value by writing to AFCR in
UEM. Again measurement is taken as previously mentioned. The two measurements are
subtracted. Then, AFCOUT is set to minimum value and again measured and compared to
mid-value results. Expected values are validated by pass or fail.
Explanation of Result
Pass or Fail
Manual Verification
In Phoenix, put phone in Local Mode. Next, BB Self Tests - select
ST_APOLL_SLEEP_CLK_TEST, then Run.
Troubleshooting
Connections tested are DBUS (see Test 5), VCTCXO circuit including AFC control voltage
from UEM, Sleepclock at UEM, and also RFCLK to UPP via V500 and C524. Check also at
UEM the OSCCAP (C234).
Test 14 ST Batman VHFPLL
Description
This is one of the phone’s self tests which gives either a pass or fail result only. The VHF
PLL 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.
Explanation of Result
Pass or Fail
Manual Verification
Turn on the Cell receiver to any channel and probe at C702 (probing point TP49 in
Table 10 using an RF probe connected to a spectrum analyzer tuned to 256.2MHz. If the
PLL is locked, it will be stable in frequency. If it is unlocked, you may have to use a wide
span, so see if it may be far off frequency.
Troubleshooting
First check that V701 has the proper orientation, then check C701, C714, R703, R702,
C715, R704, C716, L701, and C702. Also, check power supplies to Batman, particularly
check for 2.7v on VR5 at C710, and on VR7 at C708, and check for 1.8v on VIO. Next
check if CLK 19M2_B (C512) the reference frequency for PLL is at 19.2MHz. If no fault is
found, replace N701 (Batman).