Appendix A: RF Troubleshooting
Nokia Customer Care
Company Confidential
Copyright
©
2005 Nokia. All rights reserved
A-16
2.6 TX PLL phase lock self test (ST_CDSP_TX_PLL_PHASE_LOCK_TEST)
TX_PLL_LOCK_TEST (80) tests the functionality of RX PLL. If this fails also the TX power tests will fail.
Tested signals: VBAT_ASIC, VDIG, VR1, VCP2, RFBUSDAT, RFBUSCLK, RFBUSENA, TXRESETX
Error code for this self test is given in format:
•
0xyy, 0xzz
,where 0xyy, 0xzz part is the total error code:
0xyyzz
Vinku
PLL
not locked
(0x0004)
ST_CDSP_TX_PLL_PHASE_LOCK
ERROR
YES
NO
Any other code
YES
It’s not possible
to
get here
…
NO
YES
NO
YES
NO
Propable cause:
Poor solder/ Faulty Vinku
(This should have already
failed in earlier tests)
Propable cause:
Poor solder/Faulty VCO
YES
NO
Propable
cause:
Poor solder/Faulty
balun
YES
NO
Propable
cause:
Balun
or VCO
YES
Propable
cause:
correct freq and
Hinku says it’s
not locked
then change Hinku
NO
YES
NO
Propable
cause:
Poor solder/Faulty RETU
Other possible reasons:
VCP line shorted to ground
Propable
cause:
Check the loop components/
solder joints, if no help, change
Vinku
. If still not working, change
TX VCO
ST_CDSP_TX_PLL_PHASE_LOCK_TE
ST
YES
NO
Any other code
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
Vinku PLL not locked
(0x0004)
It’s not possible to get
here…
Propable cause:
Poor solder/Faulty Vinku
Other possible reasons:
(This should have already
failed in earlier tests)
Propable cause:
Balun or VCO
Propable cause:
Poor solder/Faulty VCO
Propable cause:
Test problem
RFBUS failure (but this
should be ok if we’ve
gotten this far)
Propable cause:
Poor solder/Faulty balun
Propable cause:
Correct frequency and Hinku
says it’s not locked then
change Hinku
Propable cause:
Check the loop
components/solder joints, if
no help, change Vinku. If
still not working, change TX
VCO.
Propable cause:
Poor solder/Faulty RETU
Other possible reasons:
VCP line shorted to
ground
Summary of Contents for RM-57
Page 391: ...www s manuals com ...
